1661 problem(s) found in 781 milliseconds (displaying 100 problem(s)).

1 - P0000007
Andrej N. Kornilow
Andrey Frolkin
Dmitri W. Pronkin

5408 Die Schwalbe 97 02/1986
P0000007
(15+15)
BP in 33,0
1. Sc3 Sc6 2. Se4 Se5 3. c3 c6 4. Da4 Da5 5. b3 b6 6. La3 La6 7. Lc5 Lc4 8. Le3 Le6 9. Lh6 Lh3 10. gxh3 gxh6 11. h4 h5 12. Lh3 Lh6 13. Lf5 Lf4 14. Sh3 Sh6 15. Tg1 Tg8 16. Tg3 Tg6 17. Te3 Te6 18. f3 f6 19. Kf2 Kf7 20. Tg1 Tg8 21. Tg4 Tg5 22. Sg3 Sg6 23. Lb1 Lb8 24. Td4 Td5 25. Tdd3 Tdd6 26. Df4 Df5 27. Te4 Te5 28. Ke3 Ke6 29. Sf2 Sf7 30. Sg4 Sg5 31. Sh6 Sh3 32. Sg8 Sg1 33. Dh6 Dh3
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Henrik Juel: After a couple of hours Natch 3.1 had not even found the symmetrical solution (2018-12-7)
comment
Keywords: Unique Proof Game, Symmetrical position
Genre: Retro
Reprints: 581 Ukrainisches Album 1986-1990
111 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Nikolai Beluhov, 2011-5-6 more...
2 - P0000108
Andrey Frolkin
6272 Die Schwalbe 111 06/1988
1. Lob
P0000108
(30+0) C+
Färbe die Steine!
BP in 19,0
1. h4 d6 2. Th3 Sd7 3. Tb3 Sdf6 4. Tb6 axb6 5. f4 Ta3 6. Kf2 Th3 7. a4 Th1 8. Ta3 Lh3 9. Tg3 Dd7 10. Tg6 hxg6 11. a5 Th5 12. a6 Ta5 13. h5 Ta1 14. h6 Da4 15. h7 b5 16. h8=T Sh7 17. a7 f6 18. a8=T+ Kf7 19. Ta7 Dd4+
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Henrik Juel: C+ by Natch 3.1 (16 min.)
The colored position has black Ta1,h1 and Pb5,g6, and white Ta7,h8, otherwise 'natural' (2018-12-7)
François Labelle: Henrik, did you really test all 2^30 possible colorings with Natch, or did you use human deductions to reduce the possibilities (making this HC+), or did you only test the intended coloring (making this a partial C+)? (2018-12-9)
Mario Richter: I do not think that it is necessary to check all 2^30 colorings, since the color of the pawns on files c,d,e and f is completely determined. This and more restrictions on the set of potentially possible colorings may be derived from insights presented in an article "Aggregierte Schlagbilanz" by Frolkin & Kornilov, feenschach 130, p.411ff. Since the mechanisms presented there can at least partially be implemented in a little computer program, even a "full C+" label for this problem is not out of reach ... (2018-12-10)
Henrik Juel: I only tested the intended coloring, Francois,
so the C+ label is not justifiable
In the other coloring proof games I write something like
The colored position was C+ by Natch

Mario is right, of course, in that not all colorings need testing; but still the number is very large
This genre is somewhat messy; at first I thought that the solver could determine the coloring, but this is clearly not the case; also, the intention is not
'color the men such that a correct proof game in 19 results' (2018-12-11)
A.Buchanan: Henrik: so what exactly should the stipulation be for clarity? (2018-12-12)
comment
Keywords: Unique Proof Game, Coloring problem, under-promotion (TT), Phoenix
Genre: Retro
Computer test: Natch 3.1 (16 min.)
Reprints: 158 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-7 more...
3 - P0000111
Andrey Frolkin
Leonid Lyubashevsky

6330 Die Schwalbe 112 08/1988
4. ehrende Erwähnung
P0000111
(28+0)
Färbe die Steine!
BP in 11,0
1. h4 f5 2. Th3 Kf7 3. Tb3 De8 4. Tb6 axb6 5. g3 Ta3 6. Lg2 Tc3 7. Lc6 dxc6 8. dxc3 Le6 9. Dd8 Lb3 10. axb3 Dd7 11. Ta8 Dd1+
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Henrik Juel: C+ by Natch 3.1
The colored position is 'natural' except for wTa8, wDd8, and sDd1 (2018-12-7)
comment
Keywords: Unique Proof Game, Coloring problem, Interchange
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-27 more...
4 - P0000127
Frank Christiaans
6573 Die Schwalbe 116 04/1989
P0000127
(8+11)
#3
1. Kg7xf6 Th6+ 2. Sxh6 ... 3. c8=D,T#
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s. P0000133
NN: It seems we fall short of one retro-move and fail to keep either the bK or bR still.
Let's analyse, the distribution of bPs indicate 5 captures (bPh7×g6×f5×e4×d3×c2) plus 3 captures (bPc7×d6, bPb7×c6, bg7×f6) equalling a total of 8 captures, thus accounting for all of white's missing pieces. Next, wPs captured at least 3 (fxexdxc) plus wPc2×b3. Now, in order to keep the bK & bR still, we require sufficient supply of retro-moves for black. Thus, we must strive to release the bNa1 (as pawns are not enough!) at the earliest. But this can only be done through uncapturing the bishop on c1 followed by retracting bPd3×c2, wPd2-d3. An optimal way of doing this may be: -1.bPb7×wNc6 wNc6-d4, -2.bPa4-a3 wPc6-c7, -3.bPc7×wBd6 wBd6-b4, -4.bPa5-a4 wBb4-d2 -5.bPe6-e5 wBd2-c1 and here we can't retract anymore moves without violating bK's right to castle. Retracting bPa6-a5 for instance would mean that bRa8 got out of the pawn to be captured by a wP (as bBc8 never left its homesquare) forcing the bKe8 to move.
Thus, Black can't castle and the solution is 1.Kxf6 Rh6+ (1...0-0 is illegal) 2.Nxh6 ... 3.c8R/Q# (2018-11-30)
Mario Richter: If we assume that Black can still Castle, White needs a fifth capture to provide wPh2 as a capture object.
Furthermore, before d2-d3 can be retracted, both wRa1 and wBc1 have to return home (to b1 and c1) (2018-12-1)
comment
Keywords: Castling (sk), Cant Castler
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2014-1-15 more...
5 - P0000129
Manfred Seidel
6575 Die Schwalbe 116 04/1989
P0000129
(13+12) cooked
BP in 18,5
1. c4 Sa6 2. c5 Sxc5 3. Sf3 Se4 4. Se5 Sg3 5. Sxd7 e5 6. Sb6 axb6 7. hxg3 Ta3 8. Txh7 Tf3 9. gxf3 Lf5 10. Lh3 Lxh7 11. Lc8 f5 12. d3 Kf7 13. Le3 Kg6 14. Sd2 Kh5 15. Tc1 g6 16. Tc4 Lh6 17. Te4 Df8 18. Ld4 Le3 19. Le6
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Henrik Juel: Here is one of the three similar cooks
1.Sg1-f3 Sb8-c6 2.Sf3-e5 Sc6-d4 3.Se5xd7 Be7-e5
4.Sd7-b6 Ba7xb6 5.Sb1-c3 Ta8-a3 6.Sc3-b1 Ta3-g3
7.Bh2xg3 Sd4-f3 8.Bg2xf3 Lc8-f5 9.Th1xh7 Lf5xc2
10.Lf1-h3 Lc2xh7 11.Lh3-c8 Bf7-f5 12.Bd2-d3 Ke8-f7
13.Lc1-e3 Kf7-g6 14.Sb1-d2 Kg6-h5 15.Ta1-c1 Bg7-g6
16.Tc1-c4 Lf8-h6 17.Tc4-e4 Dd8-f8 18.Le3-d4 Lh6-e3
19.Lc8-e6 (2018-12-7)
comment
Keywords: Unique Proof Game
Genre: Retro
Reprints: 146 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-27 more...
6 - P0000172
Dmitri W. Pronkin
6991v Die Schwalbe 123 06/1990
P0000172
(13+13)
BP in 24,5
1. Sc3 Sf6 2. Se4 Sd5 3. Sg5 Sc3 4. Sxh7 Sb1 5. Sxf8 Th5 6. h4 Tg5 7. hxg5 Kxf8 8. Th6 Kg8 9. Tb6 Kh7 10. g6+ Kh6 11. e4 Kg5 12. Lb5 Kf4 13. Ke2 Ke5 14. Kf3 Kd4 15. Kf4 Kc5 16. b4+ Kxb4+ 17. La3+ Kxa3 18. Df3+ Kb2 19. a4 Kc1 20. Se2+ Kd1 21. Sc1+ Ke1 22. Sd3+ Kf1 23. Sb2+ Kg1 24. Lf1 Kh1 25. Dd3
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Henrik Juel: The long promenade is made by k, not K (2018-12-7)
comment
Keywords: Unique Proof Game, Promenade (K)
Genre: Retro
Reprints: 579 Ukrainisches Album 1986-1990
113 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-27 more...
7 - P0000198
Wolfgang Dittmann
Thomas Kolkmeyer

7170 Die Schwalbe 126 12/1990
P0000198
(12+12) cooked
KBP in 16.5, Stellung nach dem 17. Zug von Weiß.
Auf welchem Feld wurde die weiße Dame geschlagen?
Duellantenschach
b) Bg4 nach g2
c) Be7 nach g5
a) 1. Sc3 Sf6 2. Se4 Sd5 3. Sd6+ cxd6 4. Sf3 Sb4 5. Sd4 Sd3+ 6. cxd3 Sc6 7. Dc2 Sa5 8. Dxc8 Sb3 9. Dc4 Sxc1 10. Db3! Sxb3 11. Se6 Sd4 12. Sf4 Sf3+ 13. exf3 Da5 14. g4 Dg5 15. Sd5 Df6 16. Sxf6+ gxf6 17. b4
b) 1. Sc3 Sf6 2. Sa4 Sd5 3. Sb6 Sf6 4. Sxc8 Sd5 5. Sd6+ cxd6 6. Sf3 Sb4 7. Sd4 Sd3+ 8. cxd3 Sc6 9. Se6 Sd4 10. Sf4 Sf3+ 11. exf3 Da5 12. Da4! Dxa4 13. b3 Db4 14. Lb2 Dxf4 15. Lc3 Df6 16. Lxf6 gxf6 17. b4
c) 1. g4 g5 2. Sc3 Sh6 3. Se4 Sf5 4. Sf6+ exf6 5. Sh3 Sd4 6. Sf4 Sf3+ 7. exf3 Sc6 8. Sd5 Sa5 9. Sb6 Sb3 10. Sxc8 Sxc1 11. Sd6+ cxd6 12. De2+! Sxe2 13. b3 Sc1 14. b4 Sd3+ 15. cxd3 De7+ 16. Kd1 De1+ 17. Kxe1
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Cook: a) Dualistisch ab 7. Zug:
1. Sc3 Sf6 2. Se4 Sd5 3. Sd6+ cxd6 4. Sf3 Sb4 5. Sd4 Sd3+ 6. cxd3 Sc6 7. Se6 Sd4 8. Sf4 Sf3+ 9. exf3 Db6 10. b4 Db5 11. De2 Dc6 12. Dd1 Dxc1 13. Dxc1 Tb8! 14. Dxc8+ Txc8 15. Sd5 Ta8 16. Sf6+ gxf6 17. g4 (G. Wilts)
paul: b)1.Sc3 Sa6 2.Sb5 Sb4 3.Sd4 Sd3+ 4.cxd3 Sf6 5.Sf5 Sd5 6.Sd6+ cxd6 7.Sh3 Sb4 8.Sf4 Sc2+ 9.Qxc2 Qc7 10.Qb3 Qxc1+ 11.Qd1 Qc6 12.Qc2 Qf3 13.Qxc8+! Rxc8 14.exf3 Rd8 15.Sh5 Ra8 16.Sf6+ gxf6 17.b4 (Jacobi). So, wQ could be taken at c8. (2018-9-18)
paul: c)The position could be obtained even faster: 1.Sc3 Sh6 2.Se4 Sf5 3.Sf6+ exf6 4.Sh3 Sd4 5.Sf4 Sf3+ 6.exf3 g6 7.g4 g5 8.Sg6 Qe7+ 9.Sxe7 Sc6 10.Sxc8 Sd4 11.Sd6+ cxd6 12.Qe2+ Sxe2 13.b3 Sxc1 14.b4 Sd3+ 15.cxd3.(Jacobi) (2018-9-18)
more ...
comment
Keywords: Castling (wgsg), Single Combat, Where was piece x captured?, Unique Proof Game
Genre: Retro, Fairies
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-2-7 more...
8 - P0000231
Jasper van Atten
7376 Die Schwalbe 129 06/1991
3. Preis
P0000231
(16+13)
BP in 20,0
1. h4 a5 2. h5 a4 3. h6 Ta5 4. hxg7 Sh6 5. g8=T Sa6 6. Tg3 Tg8 7. c4 Tg6 8. c5 Lg7 9. c6 Kf8 10. cxb7 De8 11. b8=T Lb7 12. Td8 d6 13. Td7 Dd8 14. b3 Ke8 15. Lb2 Lf8 16. Lg7 Tf5 17. Tc3 Tf3 18. exf3 Sb8 19. La6 Lc8 20. Lb7 Sg8
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Henrik Juel: C+ by Natch 3.1 (5 min.) (2018-12-7)
comment
Keywords: Unique Proof Game, Non-standard material, Promotion (TT)
Genre: Retro
Reprints: 131 Shortest Proof Games 11/1991
feenschach 137 08-09/2000
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-1-9 more...
9 - P0000245
Karlheinz Bachmann
7513 Die Schwalbe 131 10/1991
6. Preis
Informalturnier 1991
PR: Dimitri Pronkin
P0000245
(2+1) C+
BP in 16,5
1. Sf3 e5 2. Sxe5 Df6 3. Sxd7 Dxb2 4. Sxf8 Dxa2 5. Sxh7 Dxb1 6. Txa7 Txh7 7. Txa8 Txh2 8. Txb8 Txg2 9. Txb7 Txf2 10. Txc7 Txe2+ Lxe2 11. Dxc1 0-0 12. Dxd2 Tfxf7 13. Dxe2 Txc8+ Kxf7 14. Txg8 Dxc2 15. Txg7+ Kxg7 16. Dxc2
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paul: Jacobi+ (in about 30 min) (2018-8-17)
comment
Keywords: Unique Proof Game, Massacre PG, Castling, Rex solus (s), Aristocrat
Genre: Retro
Computer test: Jacobi+
Reprints: 7513 Die Schwalbe 146, p. 453, 04/1994
feenschach 137, p. 371, 08-09/2000
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-9-7 more...
10 - P0000372
Andrey Frolkin
8422 Die Schwalbe 145 02/1994
1. ehrende Erwähnung
P0000372
(14+12)
BP in 23,5
1. Sh3 g5 2. Sf4 g4 3. h3 g3 4. Th2 gxh2 5. Sh5 h1=S 6. f4 Sg3 7. f5 Sxf1 8. f6 Sh2 9. fxe7 f5 10. Kf2 f4 11. Dg1 f3 12. Kg3 Sf6 13. Dxa7 c5 14. Sc3 Sc6 15. Db8 Ta3 16. Sa4 Tc3 17. bxc3 f2 18. La3 f1=T 19. Lb4 Th1 20. Tf1 Db6 21. Tf3 Sd8 22. Te3 Sf1+ 23. Kf3 De6 24. exd8=T+
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"Uff, das war bannig oder sakrisch schwierig, je nach landschaftlicher Mundart. Daß die schwarzen UW-Steine den Platz tauschen, war wohl das Uranliegen des Autors. Aber dazu hat er sich doch ganz Hübsch etwas einfallen lassen: Falsche Fährten legen und Unerwünschtes verunmöglichen - das ist ihm bestens gelungen" (HHS) "Dieser Platztausch der umgewandelten Figuren fasziniert mich sehr" (RS) 3,5/III/6L.
Henrik Juel: Unfortunately cooked
1.Sg1-h3 Sb8-c6 2.Bf2-f4 Sc6-e5 3.Bf4-f5 Bg7-g5
4.Sh3-f4 Bg5-g4 5.Bf5-f6 Bg4-g3 6.Bf6xe7 Bf7-f5
7.Sf4-h5 Bf5-f4 8.Bh2-h3 Bf4-f3 9.Th1-h2 Bg3xh2
10.Ke1-f2 Bh2-h1=T 11.Kf2-g3 Th1xf1 12.Sb1-c3 Tf1-h1
13.Dd1-g1 Se5-g4 14.Dg1xa7 Sg4-h2 15.Da7-b8 Ta8-a3
16.Sc3-a4 Ta3-c3 17.Bb2xc3 Bf3-f2 18.Lc1-a3 Bf2-f1=D
19.La3-b4 Df1-f5 20.Ta1-f1 Df5-e6 21.Tf1-f3 Sg8-f6
22.Tf3-e3 Sh2-f1 23.Kg3-f3 Bc7-c5 24.exd8=T+ (2018-12-7)
comment
Keywords: Unique Proof Game, Interchange, Promotion (ts)
Genre: Retro
Reprints: H22 FIDE Album Annexe 1992-1994 2003
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-27 more...
11 - P0000393
Pascal Wassong
8552 Die Schwalbe 147 06/1994
2. ehrende Erwähnung
P0000393
(10+16) C+
BP in 23,0
1. h4 Sc6 2. Th3 Se5 3. Tb3 Sg4 4. Tb6 axb6 5. c4 Ta3 6. Da4 Th3 7. g3 Th1 8. Lg2 Sh2 9. Lc6 dxc6 10. Kd1 Lh3 11. Kc2 e6 12. Kb3 Lb4 13. c5 Lxd2 14. Db4 Lh6 15. Le3 Dxh4 16. Sd2 f6 17. Tc1 Kf7 18. Tc4 Kg6 19. Tg4+ Kh5 20. Tg6 hxg6 21. Lg5 fxg5 22. Ka4 Sf6 23. b3 Sh7
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more ...
comment
Keywords: Unique Proof Game, Ornament
Genre: Retro
Computer test: Henrik Juel: C+ by Natch 3.1 (4 min.) (2018-12-8)
Reprints: (I) Phénix 91 12/2000
Input: Gerd Wilts, 1995-6-3
Last update: Erich Bartel, 2018-12-8 more...
12 - P0000400
Waleri A. Liskowez
4295 Die Schwalbe 80 04/1983
P0000400
(14+9)
#2 BG
3 partial solutions in a specific order!

I 1. fxe6ep a try by the BG-logic (beruehrt-gefuehrt) with no
justification 1. ... 0-0-0/- 2. Qc4#/Rxg8# If rejected, the key must be
returned back:
II Unless the touched wP has a move:
1. Nxe5! (1. ... 0-0-0?? illegal)
If rejected again: the touched wP does have a move (ep!) and, thus, W must make it:
III 1. fxg6ep fxg6+ 2. f7#! (1. ... 0-0-0??)
NOT:
II 1. Nc5?? was illegal by the rule of touching chessmen.
(II 1. Kxe5?).
The last move g6(7)-g5 locks wRh8. ... Thus, castling implies ep
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A.Buchanan: Valery is one of the most rigorous and imaginative retro composers but very often I can’t follow his solutions as they omit too many intermediate steps. Here is an example. Can someone explain the details please? (2018-10-5)
VL: Indeed, some extra details need for the understanding, especially at present. Let me try to clarify a bit.
First of all, BG stands strongly instead of PRA. Restipulated as a PRA problem, this problem would have been soluble (of "Typ Oeffner", aka "a priori", with two partial solutions) but unsound since both 1.Sc5 and 1.Sxe5 solve if castling is illegal. BG always works with PRA-like problems (sound or not).
BG is a hybrid controversial genre that allows to find and justify partial solutions by means of some active actions (in the spirit of RS and AP!) that aren't necessarily legal moves at the moment when they are fulfilled. Namely, BG permits to introduce move attempts into the actual solution as if the moves were fulfilled OTB (of course only meaningful attempts are taken into account; in fact only ep captures or around). Such an attempt forces the referee/opponent to specify the prehistory: the attempt may be adopted (one partial solution), or it may be rejected as contradicting the prehistory of the position (another partial solution). However (contrary to usual PRA variations), in the latter case, the rejected move should be replaced by a move in accordance with the rule of touching pieces.
Now, it is assumed that any capture is made physically in exactly one way: both participating pieces are touched simultaneously...
It is worth adding to the provided solution that wrong (premature) would be the second try II 1.fxg6ep? since after rejection, White were forced to replace it by the capture of the touched bPg5 by an officer, with no mate!
In general, in my opinion, quite a natural logic. However, a very sophisticated scenario with the unexpected rejection of the second (not ep!) try of capturing Pe5. Simpler are my earlier BG-problems including ones considered in my old article Anwendung der `ber"uhrt-gef"uhrt'-Regel in Retroproblemen, Die Schwalbe, 1981, H.69. (2018-10-7)
A.Buchanan: Valery, I love you, but I don't find this sufficient. It is probably a good high level reminder if addressed to someone who basically understands BG,PRA,RS,AP intimately already. It has helped me to expand the definition of the Touch Move keyword. But it does not address my request to make the solution sufficiently detailed. My perspective is almost always to render our art comprenensible by intelligent newcomers from facebook, whatsapp, chess.com etc. It is insufficient to explain in terms of PRA,RS,AP, because those are insufficiently defined here in PDB. You said this is a complicated one: I will pick a simpler one, and have a go to solve that. If the best tutorial is in your 1981 article, maybe you can make that available online, or send it to me, and I will publicize it. Thanks so much! (2018-10-7)
comment
Keywords: Touch Move, Castling (sg), Promoted material on the board (L)
Genre: Retro, 2#
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-7 more...
13 - P0000849
Gerd Rinder
184 Die Schwalbe 4 04/1970
P0000849
(2+16)
#2 (RV)
1. Dxg7 oder 1. Dc7
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Eine der beiden schwarzen Rochaden ist unmöglich, da entweder wBa2 oder wBh2 auf a8/h8 umgewandelt haben müssen, um als Schlagobjekt zur Verfügung zu stehen.
Sally: °
Das Diagramm zeigt zwei Problemstellungen,eine mit zulässiger
s0-0. Die gesamte schwarze Mannschaft steht auf dem Brett. Die
sBB schlugen von rechts nach links 12 mal, dazu axb = 1,
zusammen 13 mal. Weiß vermisst zwar 14 Steine. doch konnten seine Randbauern nicht von den sBB geschlagen werden. Einer davon müsste sich umwandeln, um als Schlagobjekt dienen zu können, der andere fiel duech eine schwarze Figur. So wurde die s0-0 bei Umwandlung des wBh verwirkt (Stellung a), die
s0-0-0 bei Umwamdlung des wB5b (Stellung b). Jeweils eine Rochade bleibt zulässig.
a) 1. Dc7! (2. De7#) - Kf8, 2. Df7#.
.. 1. - Lf8,2. Dd7#; 0-0 unzulässig!
b) 1. Dxg7!(2. De7#) - Kd8, 2. Dd7#.
.. 1. - Th7,2. Dg8#; 0-0-0 unzulässig. (2018-8-29)
comment
Keywords: Castling (sksg), Partial Retro Analysis (PRA)
Genre: Retro
Reprints: Problem 148-151 11/1972
D19 feenschach 27, p. 27, 04/1975
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-9-7 more...
14 - P0000957
Theophilus Harding Willcocks
Die Schwalbe 1949
P0000957
(4+8)
Letzter Zug?
R: 1. a7xTb8=L
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Yoav Ben-Zvi: WBd8 can be replaced with a BN after moving BPg7 to f7 and BPh5 to h6. (2018-8-8)
A.Buchanan: Yes after all these years, I found this a few months ago, but when I told Thomas Brand, he said that Werner Keym had found it - one of a series of modifications through seeking to avoid non-standard material. (2018-8-12)
Henrik Juel: Werner's improvement can be found in his 'Eigenartige Schachprobleme' from 2010, p.196, dia 1.68 (2018-8-12)
A.Buchanan: I thought it was more recent (2018-8-12)
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comment
Keywords: Type A, Last Move? (BxT=L), Promotion in the retro play (L), Economy record, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-8-9 more...
15 - P0001110
Michel Caillaud
3396 Die Schwalbe 67 02/1981
4. Preis
P0001110
(14+12)
Wieviele Züge sind seit dem letzten Bauernzug mindestens geschehen?
Renny Bosch: I believe the minimum number of moves since the last pawn move is 68, based on the following PG (or SPG?): 1. g4 Nc6 2. Bg2 Na5 3. Bc6 Nb3 4. axb3 Nf6 5. Nc3 Ne4 6. Nd5 Nc3 7. dxc3 Rg8 8. Qd4 Rh8 9. Qb6 axb6 10. Be3 Rg8 11. Bc5 Rh8 12. Bb4 Rg8 13. Ra5 Rh8 14. Rc5 bxc5 15. Ba5 Rg8 16. Bb6 Rh8 17. Ba7 Rg8 18. Bb8 Rh8 19. Ba4 Ra6 20. Kd2 Re6 21. Kd3 Re5 22. Kc4 Re4+ 23. Kb5 Rc4 24. bxc4 Rg8 25. Bb3 Rh8 26. Nh3 Rg8 27. Ra1 Rh8 28. Ra7 Rg8 29. Nb6 Rh8 30. Na8 Rg8 31. Nf4 Rh8 32. Nd5 Rg8 33. Ndb6 h6 34. Na4 b6 35. Ba2 Bb7 36. Bb1 Be4 37. g5 Bh7 38. g6 Rh8 39. gxh7 { the last pawn move } g6 40. Rb7 Bg7 { move bB, bK, bQ out of row 8 } 41. Ba7 Be5 42. Rb8 Kf8 43. Ka6 Kg7 44. Kb7 Qg8 45. Rf8 Kf6 46. Kc8 { allow bR to pass wK } Qg7 47. Rg8 Ke6 48. Kd8 Qf6 49. Ke8 Qf5 50. Kf8 Bf4 51. Kg7 Qg5 { reverse order of the two rooks }52. Rb8 Rc8 53. Rb7 Rd8 54. Bb8 Rc8 55. Ra7 Rd8 56. Ra5 Rc8 57. Ba7 Rb8 58. Rb5 Rb7 59. Bb8 Ra7 60. Rb3 Ra5 61. Ra3 Rb5 62. Ra1 Rb3 63. Ba2 Ra3 64. Bb3 Ra2 65. Rd1 Ra1 66. Rd2 Re1 67. Rd1 Rf1 68. Ra1 Rb1 69. Ra3 Rc1 70. Ba2 Ra1 71. Bb1 Ra2 72. Rb3 Ra3 73. Rb5 Rb3 74. Ra5 Ra3 75. Ra7 Rb3 76. Rb7 Ra3 77. Ba7 Rb3 78. Rb8 Ra3 79. Rh8 Qf6+ 80. Kf8 { move bK past wR } Qg7+ 81. Ke8 Kf6 82. Kd8 Be5 83. Kc8 Qg8+ 84. Kb7 Kg7 85. Ka6 Kf8 86. Kb5 Ke8 87. f3 Kd8 88. Ba2 Kc8 89. Bb1 Kb7 90. Ba2 Qg7 91. Rg8 Qf6 92. Bb1 Qe6 93. Ba2 Bh8 94. Rg7 { put wR into pocket, and final cleanup } Kc8 95. Ka6 Kd8 96. Kb7 Ke8 97. Kc8 Kf8 98. Kd8 Rb3 99. Bb1 Rb5 100. Ba2 Ra5 101. Bb8 Ra7 102. Bb1 Rb7 103. Ba7 Qc6 104. Ba2 Qb5 105. Bb1 Qb4 106. Ba2 Qa3 107. Rg8# (2007-4-24)
Michel Caillaud: the exact stipulation ends "mindestens geschehen".
(in english : "minimum number of moves since the last Pawn move?").
the last Pawn move is f2-f3,that must be interposed before g7-g6 as otherwise the 50-moves rule would have been violated.
the answer is a minimum of 15,0 moves with a retro-play running as :
-1.Tg7-g8# ...-16.f2-f3! ... -65...g7-g6
with 49,5 moves between g7-g6 and f2-f3 the 50-moves rule has been respected (2007-9-12)
Michel Caillaud: more detail on intended retro-play :
-1.Tg7-g8# … -4…De6-c6 … -8…Tb3-b5 -9.Kb5-a6 Ta3-b3+ -10.La7-b8 … -13…Kb7-c8 -14.Tg8-g7 Ld4-h8
-15.Tf8-g8 Df6-e6 -16.f2-f3! Dg7-f6 -17.Th8-f8 Dg8-g7 -18.Lb1-a2 Ta1-a3 -19.La2-b1 … -24… Kf6-g7 -25.Kb7-a6 Dg7-g8 -26.Tb8-h8 Ke5-f6 -27.Kc8-b7 … -28… Dh4-f6 -29.Ke8-d8 … -35… Td2-d1 -36.Ta3-b3 … -37.Lb3-a2 … -39.Th1-a1 Td1-d2 -40… Ta1-d1 -41.Kg7-f8 Ta3-a1 -42.La2-b3 …-48… Th8-b8 -52.Tb7-a7 … -53.La7-b8 … -55.Tg8-b8 … -59.Kç8-d8 Kf6-e5 -60.Kb7-ç8 Kg7-f8 -61.Tb8-g8+ Kf8-g7 -62.Kc8-b7+ Ke8-f8 -63.Tb7-b8 Lg7-d4 -64.Lb8-a7 Lf8-g7 -65.Ta7-b7 g7-g6 (2007-9-18)
Henrik Juel: After -1.Tg7-g8# the main parts of the resolution are
(s/w mean black/white)
sDa3 out, sTb7 to a3, wKe8 to b5, sKf8 to b7, wTg7 to h8 and sLh8 to d4, sD to g8, sKb7 via g7 to e5, sDg8 out, wKb5 to g7, sTa3 to d2, wTh8 to e1, sTd2 to h8, wTe1 to g8,
(the rooks have switched place)
wKg7 to b7, wTg8 to b8, wKb7 to c8, sKe5 to e8, sLd4 to f8,
-65... g7-g6 -66.g6xLh7
(so -16.f2 was needed to avoid draw by the 50 moves rule)
wTb8 to h1, wKc8 to b5, sD to d8, sLh7 to c8,
-88... b7-b6
wSa8 out, wLa7 to a5,
-99... b6xTc5
wTc5 to a1, wLa5 to c1,
-111.d2xTc3
sTc3 to a8 and wSa4 to b1, wLa2 to a4
-222.b3xSc4 a7xDb6 -223.a2xSb3 (2018-12-5)
Henrik Juel: It is difficult to avoid typos in such a mess
in line 3, wKd8 to b5, not e8
Michel also seems to have made some typos:
49.0 moves between -16.f2 and -65... g7, not 49.5
-25... Kf6, not 24 (may have implications for the solution) (2018-12-5)
more ...
comment
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 2008-8-26 more...
16 - P0001404
Jean Roche
278 Europe Echecs 182 01/1974
Lob
P0001404
(7+13) C+
h#2
if white can castle: 1. Td7 0-0-0 2. Kd8 Dxd7#
if black can castle: 1. Td7 Txa7 2. 0-0-0 Ta8#
play all play one stop play next play all
NN: The above is basically two parts of a single solution depending on the history of the game and not two different solutions.

Proof of why castling rights are mutually exclusive: Let's assume black CAN castle. Now, the bPs piled up on h-file implies six captures of white units and these can only be wRBBNN & wPe2. Because all other possibilities involve promotion of wPs on d8/e8/f8 followed by their capture by bPs, interfering with black's castling right. Next, we observe that wRh1 getting captured by bPs implies one of the following two things: (i) wKe1 moved to let wRh1 out of the pawn-chain or (ii) wPg2,h2 cross-captured on h3,g3 respectively to facilitate the escape of wRh1. Furthermore, option (ii) necessitates bPd7 to be promoted to d1 so that it can be captured by wPs, implying wKe1 had to move anyway to let bPd7 promote.
Thus, Black can castle implies wKe1 moved and white can't castle. Contrapositively, white can castle will imply that black can't. (2018-11-29)
Henrik Juel: Nice analysis, Satanick (2018-11-29)
NN: Thanks Henrik Juel. Hope there are no mistakes. (2018-11-29)
Yoav Ben-Zvi: The claim that retaining Black castling requires an uncapture of a wR by Black's h-file pawns is not accurate. Consider the case that all 6 of these bP uncaptures are of wBs and wNs. In this case 2 of the uncaptured White pieces unpromote. Both could be unpromoted (on f8 or d8) by an uncapture from e7. This scenario requires a third wP uncapture (on the e file) so one of White's uncaptures is accounted for by [bPd7]. The direct uncapture of [bPd7] (on the e file) or its unpromotion without stepping on d2 requires this pawn to uncapture the wR, confirming the conclusion of mutually exclusive castling. A similar argument works for the case that the Black h file pawns play bPe7xwPf6 along with 5 uncaptures of WNs and wBs. (2018-12-3)
Henrik Juel: Now we can test
C+ by Popeye 4.61 (and analysis)
The main content is the retro analysis, of course, but as a helpmate problem the repeated 1.Td7 detracts (2018-12-3)
more ...
comment
Keywords: Partial Retro Analysis (PRA), Castling (wgsg), Castling, mutual exclusive
Genre: h#, Retro
Computer test: Popeye 4.61
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-3 more...
17 - P0001430
Luis Alberto Garaza
304 Europe Echecs 205 01/1976
P0001430
(13+14)
#3
if Black can castle long: 1. Dxc7! droht 2. Dxe7#
1. ... Sf5,Se7~ 2. Dd7+ Kf8 3. Df7#
1. ... Kf8 2. Dxe7+ Kg8 3. Dxg7#

if Black can castle short: 1. Dxg7! droht 2. Dxe7#
1. ... Sf5,Se7~ 2. Df7+ Kd8 3. Dd7#
1. ... Kd8 2. Dxh8+ Sg8 3. Dxg8#
play all play one stop play next play all
Satanick: Castling for black is legal only on one side. The above solution cover the two mutually exclusive cases.
NN: Solution: If Black can castle long: 1.Qxc7! (Threat: Qxe7#) 1...N moves (1...Kf8 2.Qxe7+ Kg8 3.Qxg7#) 2.Qd7+ Kf8 3.Qf7# & if Black can castle short: 1.Qxg7! (Threat: Qxe7#) 1...N moves (1...Kd8 2.Qxh8+ Ng8 3.Qxg8#) 2.Qf7+ Kd8 3.Qd7#

The bBe1 is obviously a promotee. This implies bPd7,e7 made one capture each namely, dxe & fxe. Consequently, either the missing wPg2 or wPb2 (but not both!) had to be captured by bP on the e-file. But neither wPg2 nor wPb2 could have gone to the e-file capturing white units because that, together with wPe2×d3, make three captures in all and black is missing only two units. Hence, either one of them promoted to h8/a8 first prior to be captured on the e-file. This shows exactly one of bRh8 and bRa8 has moved before facilitating the promotion and therefore, black has right to castle only on one side. Accordingly,1.Qxc7 is the key if black has the right to castle long and 1.Qxg7 is the key if otherwise. (2018-11-29)
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comment
Keywords: Cant Castler, Castling (sksg), Promotion (l), Partial Retro Analysis (PRA), Promoted material on the board (sLe1)
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-11-30 more...
18 - P0001613
Andrey Frolkin
483 Europe Echecs 343/344 07/1987
P0001613
(13+14) C+
BP in 21,5
1. a4 Sc6 2. Ta3 Sd4 3. Tg3 Sxe2 4. Kxe2 g5 5. Ke3 Lh6 6. Lc4 Kf8 7. La2 Kg7 8. c4 Kf6 9. Db3 Ke6 10. Db6+ axb6 11. b4 Ta5 12. Lb2 Tb5 13. Lg7 Sf6 14. Sf3 Dg8 15. Lf8 Dg6 16. Te1 Tg8 17. Te2 Tg7 18. Se1 g4+ 19. f4 gxf3ep+ 20. Tg5 Sg8 21. c5+ d5 22. cxd6ep+
play all play one stop play next play all
Ein schwarzer und ein weißer ep-Schlag.
more ...
comment
Keywords: Unique Proof Game, En passant
Genre: Retro
Computer test: Natch 3.1 (5 min.)
Reprints: 575 Ukrainisches Album 1986-1990
94 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-6 more...
19 - P0001659
Andrey Frolkin
Leonid Lyubashevsky

528 Europe Echecs 370 07-08/1990
3. Preis
P0001659
(13+15) C+
BP in 19,5
1. e4 c5 2. Ld3 c4 3. Se2 cxd3 4. 0-0 dxe2 5. e5 e1=T 6. e6 Te5 7. a4 Tb5 8. Ta3 d5 9. Tg3 Ld7 10. Tg6 fxg6 11. exd7+ Kf7 12. Dg4 e5 13. f3 Dg5 14. Kf2 Lc5+ 15. Ke1 Se7 16. d8=L Tf8 17. La5 Kg8 18. Lc3 a5 19. Th1 Sa6 20. De6+
play all play one stop play next play all
paul: The first 17,5 moves checked by Euclide 1.11. (2018-8-9)
Henrik Juel: C+ by Natch 3.1 in less than 4 minutes
This is one of the (few) cases where Natch beats Euclide... (2018-8-9)
Henrik Juel: The diagram position suggests that Black castled and White did not, but actually it is the other way round
This double castling paradox is achieved in 18.5 moves at the cost of two obvious promotions (2018-8-9)
comment
Keywords: Unique Proof Game, Non-standard material, Castling (wksk), Castling Paradox (wk hidden sk fake), Promotion (Lt), under-promotion
Genre: Retro
Computer test: Natch 3.1
Reprints: 574 Ukrainisches Album 1986-1990
90 Shortest Proof Games 11/1991
(17) diagrammes 15 07-09/1994
5 feenschach 121, p. 306, 11/1996
feenschach 141, p. 157, 06/2001
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-8-10 more...
20 - P0002005
George Hume
6 British Chess Magazine 20/12/1893
P0002005
(11+9) cooked
s#1
R: 0. Bg2xSh1=S, dann 0. ... Tgxh1,Thxh1 1. Lxg2+ Txg2#
play all play one stop play next play all
Original solution text: Black has just played P from K Kt 7, taking Kt on R sq, claiming Kt double ch; but as the thereby discovers ch th his own K, White calls upon him to retract his move, and take the Kt legally, viz.: either RxKt, then White 1 BxP ch, RxB mate. (Frank Müller)
In modern notation: Black just played g2xSh1=S illegally. White asks him to retract this and to capture the knight legally, so Black then plays Tgxh1 or Thxh1. Either way White forces selfmate by 1. Lxg2+ Txg2#. (Henrik Juel)
Cook: Question: is this cooked? In "Retrograde Analysis" by Dawson and Hunsdorfer, this is given as one of several examples where both kings are apparently in check. In the solution, they give no mention of the choice of piece captured on h1, and on the next page compliment the problem as being "more plausible" and "sounder" than the other examples, because "in the latter other suppositions would explain the matter just as well". However I think that D&H missed something here. The pieces outside the SE corner only serve to try to force uniqueness of the illegal move, indicated in the original solution.
A.Buchanan: Why was it S captured on h1? Could be anything even wL. E.g. R: 1. gxh1=S Sf3 2. ke1-f1 Dd2+ unwinds ok. Need e.g. to replace wBa4 with wLa5 to force gxSh1=S. Agreed? (2018-10-5)
Mario Richter: Andrew's suggestion doesn't force gxSh1, it's still possible to retract gxLh1. The resulting position (sPawn g2, wLa5+wLh1) can be explained by e.g.
wPawnCaps: b2-b4xBa5 d2xLe3 c2xSd3xLe4xDf5xTg6xSh7
wProms: a8=D a8=L
sPawnCaps: c7xDd6-d5xSe4xTf3xTg2
sProms: b1=T
White's last move after 1. ... g2xLh1 might have been 2. Db4-d2! Ke1-f1 3. Sd2-f3+ (2018-10-5)
A.Buchanan: Hi Mario, well nearly. So wSc2 instead of wLa5 will do it. (2018-10-5)
A.Buchanan: But no: R: 1. g2xh1=S S~f3 2. f3xg2 etc allows the retraction whatever the piece captured on h1. (2018-10-6)
A.Buchanan: I have a fix for this that Mario has verified (thank you!) and will try to publish. (2018-10-7)
more ...
comment
Keywords: Illegal position, Touch Move, Retract illegal move, Joke
Genre: Retro, s#
Reprints: 7 Retrograde Analysis 1915
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-7 more...
21 - P0002051
Frideswide F. Rowland
Chess Fruits 1884
P0002051
(15+10)
Nehme 3 Einzelzüge zurück, dann #2 durch Weiß.
Weiß am Zug.
R: 1. ... 0-0 2. Ld5-a8 b7-b6, dann 1. ... Txh8+ Kd7 2. Dxc7#
play all play one stop play next play all
One of the best tests for thoroughly understanding problems of this class is to play a game up to the position. If the solver succeeds in doing so he will find that he has made the moves which are to be retracted, as such must be made to arrive at the position.
A better way is to give the problem an analytical examination, count the numer of captures made on either side, and note where each of the men played from, when and how they played, was it by capturing or otherwise. In the above problem we note that White lost a R only, which must have been captured by Black's KP [e7xf6], as its position shows that it made a capture. Black lost six men, the number off the board. His QP at Q7 [sBd2] did not play from B6 [c3xd2?] ass it made no capture, and consequently could not have moved last, neither could his QKtP [sBb7] or KP [sBe7], otherwise White's Bs could not be where they are. His KRP [sBh7] is off the board - our analysis will presently account for how it was captured. It is obvious that his R at R3 [sTa6] could not have played last, neither could R at RBsq [sTf8], as then the White K would have been in check, and it is not allowable to suppose that it remained in check.
Now the question is, Could Black's last move have been K from Rsq to Ktsq [sKh8-g8], moving from a check given by the R? This, we find on a further analysis, could not be, as the White R did not capture Black's KRP, consequently it could not have given check at the square it stands on. None of the White's pieces made a capture, the men were taken by his Pawns only, QP at QR5 [wBd2xc3xb4xa5] took three, and KP, KBP, and KRP took one each [wBe2xd3,wBf2xe3,wBh2xg3], none of them could have taken a P, consequently it follows that six Black pieces off the board were captured. There are only five Black pieces off the board, also a P, that P is Black's KRP [sBh7], which moved down the file to R8 [h1], was promoted to a Piece, and duly captured.
After all this we find that there is only one possible move Black could have made on his last, and that was Castles, this we accordingly retract. Having retracted it, we look to see what move White could have played for his last. All his men appear to be free, that is, not confined as Black's are, and it may appear difficult to determine what his last move was. In this case we look to see what Black's second last move could have been.
He did not play K or KR [sTh8] as he was able to castle after, neither could he have played QR or QP [sTa6,sBd2], it is also obvious that he did not play KPxR [sBe7xTf6], in consequence of the B at Q8 [wLd8 (außerdem auch, weil sonst der sLf8 als Schlagobjekt fehlt)], but if the B at QR8 [wLa8] were not there he could have played P to Kt3 [sBb7-b6]; consequently to allow of this second last move of Black's, White must retract a move made with his KB. There is only one square it could have played from and that is Q5. Therefore B at Q5 to R8 [wLd5-a8] was White's last move, and P at QKt2 to Kt3 [sBb7-b6] was Black's second last move.
White for his last move could not have made a capture with any of his Ps as Kts stand behind QP and KBP, the KP played early in the game to allow KB to play out, and KRP did likewise to allow Black's RP to play to R8.
The conditions of the problem do not ask for more than two of Black's moves to be retracted, yet the solver could demonsterate what his third last move was, viz., R to R3 [sT-a6].
On word as to the line of play leading up to the position. It may be considered very bad play, and it would be such were it played as a game, burt no matter how improbable the line of play may be, as long as the moves are possible they are sufficient to prove that the position can be arrived at and consequently sound.
Having retracted the moves in the problem [1. ... 0-0 2. Ld5-a8 b7-b6] we give, White mates by 1 RxRch, I K to Q2, 2 QxBP mate.
Frideswide F. Rowland in 'illustrated Science Monthly': "Retraction Problems take the form of end games in which one or more moves are to be retracted prior to playing to effect the required mate. There are two classes, which we will term legal and illegal. In the former the position is constructed in strict conformity with the laws of the game, and proof is shown that the moves to be retracted are those which have been actually made. Problems of this class are, as a rule, most ingenoiusly set, instructive to the solver, and worthy of more attention than is given to themby the composer. There is some difficulty in their construction which may perhaps be the cause of their not being more frequently composed.
In the latter class the move to be retracted may be any, according to the whim of the composern, which will allow of the mate which follows it. There is no proof to show what the last move was, it is left with the solver to assume that the move to be taken back was the one made. These problems are neither ingenious nor abstruse, and very much inferior to all other classes. They are constructed by simply setting up an ordinary direct mate position and misplacing one of the men, the replacing of which constitutes the retraction. If the conditions of such a problem is 'Retract White´s last move and then White to play and mate', it simply means White is to make two moves in succession. We dismiss this class as one unworthy of further attention and give our solvers an illustration of the legal Retraction Problem."
Henrik Juel: -1... 0-0 -2.Ld5 b6, 1.Txh8+ Kd7 2.Dxc7#, although Black has the move! (2004-3-8)
A.Buchanan: Maybe the idea was that by moving b6, Black was playing out of turn and the error when detected later had to be unwound. Black’s prior move had to have been R-a6 from somewhere. (2018-8-29)
A.Buchanan: Her remarks about retractor types are surprisingly direct. Mrs Baird wouldn’t have been too pleased to read that! (2018-8-30)
Henrik Juel: Andrew, on your first comment:
I believe that Frideswide just did not care about irregular move order, which is surprising in view of her 'modern' view on retro problems
On your second comment:
Yes, apparently there was no love lost between the two women; Frideswide was the better analyst, but Mrs. B managed to produce the beautiful Twentieth Century Retractor (I have seen the book) (2018-8-30)
A.Buchanan: @Henrik I disagree that "Frideswide just did not care about irregular move order". Actually I think she cared very much, with two problems here revolving around the idea of unwinding play out of turn. (2018-10-7)
comment
Keywords: Castling in the retro play (sk), Help retractor
Genre: Retro
Reprints: Illustrated Science Monthly , p. 223, 06/1885
29B Retrograde Analysis 1915
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-9-7 more...
22 - P0002070
Joseph C. J. Wainwright
American Chess Bulletin 04/1912
P0002070
(7+2) C+
#3
1. b4+? Kb1 2. Lb3 Ka1 3. 0-0?
1. Lb3! Kb1 2. Kd1 Ka1 3. Kc2#
play all play one stop play next play all
Martin Ramsauer: Reprint: Schach-Echo 08/1936, Umschlag-Innenseite (Artikel "Die Scheinlösung" von Emil Ramin) (2018-8-23)
Henrik Juel: Kc1 entered via d2 or e1, so White may not castle
1.Lb3 Kb1 2.0-0?
C+ by Popeye 4.61 (2018-8-23)
comment
Keywords: Cant Castler, Castling (wk)
Genre: Retro
Computer test: Popeye 4.61
Reprints: 40 Retrograde Analysis 1915
Schach-Echo 08/1936
2 L'Echiquier de Paris 01/1956
RA7 diagrammes 13 02/1975
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-9-11 more...
23 - P0002188
Gerd Wilts
169 Shortest Proof Games 11/1991
P0002188
(0+16) cooked
Ergänze die 16 weißen Steine so, daß eine dualfreie BP in 10,0 ensteht!
1. g3 Sf6 2. Lg2 Sd5 3. Kf1 Sb6 4. Ld5 Sc6 5. Kg2 Se5 6. Df1 Sg6 7. Kf3 Tg8 8. Dg2 Sh8 9. Kf4 Tb8 10. Df3 Sa8
play all play one stop play next play all
Cook: NL
1. d3 Sf6 2. Le3 Sd5 3. Kd2 Sb6 4. Kc3 Sc6 5. Sd2 Tb8 6. Tb1 Sa8 7. Lb6 Se5 8. e3 Sg6 9. Kc4 Tg8 10. c3 Sh8
1. e3 Sf6 2. Lc4 Sd5 3. Ke2 Sb6 4. Ld5 Sc6 5. c4 Se5 6. Sc3 Sg6 7. Kf3 Tg8 8. De2 Sh8 9. Kf4 Tb8 10. Sf3 Sa8
(François Labelle)
François Labelle: Is the solution supposed to be unique? Some variations of the intention also work, for example 10.De4 instead of 10.Df3. Some completely different solutions also work, for example
1.d3 Sf6 2.Le3 Sd5 3.Kd2 Sb6 4.Kc3 Sc6 5.Sd2 Tb8 6.Tb1 Sa8 7.Lb6 Se5 8.e3 Sg6 9.Kc4 Tg8 10.c3 Sh8
1.e3 Sf6 2.Lc4 Sd5 3.Ke2 Sb6 4.Ld5 Sc6 5.c4 Se5 6.Sc3 Sg6 7.Kf3 Tg8 8.De2 Sh8 9.Kf4 Tb8 10.Sf3 Sa8
There are 16 solutions in total, according to my computer. (2018-10-30)
Henrik Juel: Strange that Gerd did not notice the Df3/De4 'dual' (2018-10-30)
comment
Keywords: Unique Proof Game, Add pieces
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-11-2 more...
24 - P0002206
Samuel Loyd
Le Sphinx 10, p. 145, 01/10/1866
P0002206
(16+16)
#4
Schwarz kopiert die weißen Züge
3 Lösungen
1) 1. c4 c5 2. Da4 Da5 3. Dc6 Dc3 4. Dxc8#
2) 1. d4 d5 2. Dd3 Dd6 3. Df5 Df4 4. Dxc8#
3) 1. d4 d5 2. Dd3 Dd6 3. Dh3 Dh6 4. Dxc8#
play all play one stop play next play all
Als Schachgedicht "Loyd und der Pigeon" von C. Kupffer im Deutschen Wochenschach 24.11.1907 (Quelle: Sam Loyd und seine Schachaufgaben, 1926, S. 469)

Loyds englische Formulierung der Forderung: "If both parties make the same moves, how can the first player mate in four moves?"

in 'Ruy Lopez' abgedruckt in der Rubrik "Partidas de fantasia"

Originalabdruck in 'Le Sphinx' in der Rubrik: "Questions du Sphinx" mit folgendem Text:
"Deux joueurs sont en présence et se disposent à commencer une partie. Celui qui les Noirs ne connaît rien du jeu; mais, après s'être donné comme très-fort, il n'a pu se dispenser d'accepter le défi. Il s'est dit en lui-même qu'il lui suffirait, pour se tirer dèmbarras, de copier exactement tous les couops de son adversaire. Le joueur qui a les Blancs, ayant flairé le manége, jouen en conséquence et donne le mat au quattrième coup.
Comment, les Blancs ayant le trait et les Noirs jouant les mêmes trois premiers coups que leur adversaire, celui-ci peut-il obtenir le mat en quatre coups?"
Frank Müller: Im American Chess Journal 1876, Seite 48, wird nur die Lösung mit 1. c4 genannt. (2015-2-23)
Henrik Juel: The third solution is similar to the first, so they are probably a sort of cooks, later promoted to solutions.
1. d4 d5 2. Dd3 Dd6 3. Dh3 Dh6 4. Dxc8# (2015-2-23)
Henrik Juel: After the re-numbering it is solutions 2) and 3) that look like cooks (2015-2-23)
A.Buchanan: I don't think this is a fairy: I think it's just a conditional problem. If it was a fairy, then it would be cooked by e.g. 1. Sa3 Sa6 2. Sb5 Sb4 3. Sc7# since Black cannot continue to imitate White. (2018-9-2)
more ...
comment
Keywords: Conditional problem, Construction task
Genre: n#
Reprints: American Chess Journal , p. 18, 15/06/1876
333 Chess Strategy [Loyd] , p. 174, 1878
Ruy Lopez 3 03/1897
Deutsches Wochenschach , p. 418, 24/11/1907
61-I Sam Loyd and his Chess Problems , p. 58, 1913
61/I Sam Loyd und seine Schachaufgaben 1926
feenschach 46, p. 81, 04-06/1979
K166 Problemkiste (94) 08/1994
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-9-2 more...
25 - P0002212
Anders Olson
7817 Springaren 57 06/1994
P0002212
(0+1)
h-retro-#2
Circe
b) wKg4, sKg1
c) wKb1, sKg6
d) wKe1, sKg7, sBf7
e) wKf8, wBh4, sKg6
A.Buchanan: There are today 1050 Circe problems in PDB which are not marked as fairies! Most are retros, and some poor person has already spent time and energy entering them under the mistaken assumption that a problem can only have 1 genre. And this is just 1 fairy condition. There is no point in us fixing them one by one because if Gerd ever returned to active maintenance of the site, he could fix the whole issue in a few minutes. Very frustrating. PDB is a great system but has a huge data quality issue. (2018-9-20)
Henrik Juel: This problem has the added difficulty that it is unclear what is expected by the solver
Possibly, in part a), the first white 'retraction' is just the addition of the white king somewhere (2018-9-20)
comment
Keywords: Help retractor, Circe, only Kings
Genre: Retro, Fairies
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-12-6 more...
26 - P0002272
Andrey Frolkin
Themes-64 1985
Lob e.a.
P0002272
(12+14) C+
BP in 20.5
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. h4 axb1=S 7. h5 Sc3 8. h6 Sxd1 9. hxg7 h6 10. Th5 Th7 11. Ta5 b5 12. Ta8 Ta7 13. f3 La6 14. f4 Dc8 15. f5 Db7 16. f6 Df3 17. gxf3 Kd8 18. Lh3 Kc8 19. Lg2 Kb7 20. Lh1 Kc6 21. f4+
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (2 min.)
Tempo loss at 13.f2-f3-f4 and 18.Lf1-h3-g2-h1 (2018-12-6)
Joost de Heer: IMO f2-f3-f4 isn't a tempo loss, as the pawn is needed for shielding. (2018-12-7)
Henrik Juel: I see no shielding by [Pf2], Joost
White could play 13.f4?, but he would run out of moves
White plays 17.gxf3, and this wP will later shield, so wLg2 does not check sKb7, but that is a different story (2018-12-7)
comment
Keywords: Unique Proof Game, Non-standard material, Loss of tempo (BL3), Promotion
Genre: Retro
Computer test: Natch 3.1 (2 min.)
Reprints: 63 Shortest Proof Games 11/1991
3397 U.S. Problem Bulletin 102/103 07-10/1995
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-7 more...
27 - P0002281
Andrey Frolkin
2320 diagrammes 94 07-09/1990
1. Preis
P0002281
(14+16)
BP in 15,5
1. d3 d5 2. Le3 d4 3. Sd2 dxe3 4. Sb3 Dd4 5. Dd2 Ld7 6. 0-0-0 exd2+ 7. Kb1 De3 8. Tc1 d1=T 9. d4 Td3 10. Td1 Tc3 11. Td2 Tc6 12. Kc1 Td6 13. Kd1 Lc6 14. Ke1 Sd7 15. Td1 0-0-0 16. Ta1
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (28 min.) (2018-12-8)
Henrik Juel: No solution in 15.0 or 14.5, so C++... (2018-12-8)
comment
Keywords: Unique Proof Game, Castling (wgsg), Castling Paradox (wg hidden), Non-standard material (t), Promoted material on the board (t)
Genre: Retro
Reprints: 88 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: TBr, 2018-3-23 more...
28 - P0002284
Andrey Frolkin
Kalininskaja Prawda 1988
Spezialpreis
P0002284
(14+13)
BP in19,5
1. Sf3 Sc6 2. Se5 Sd4 3. Sc6 dxc6 4. b4 Dd5 5. b5 Ld7 6. b6 0-0-0 7. bxa7 Le8 8. a8=S Kb8 9. Sb6 Ka7 10. Sd7 Ka6 11. Sxf8 Td7 12. Sg6 hxg6 13. c4 Th5 14. e4 Te5 15. Le2 f5 16. 0-0 Sf3+ 17. Kh1 Sg1 18. f3 Sf6 19. c5+ b5 20. cxb6ep+
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1
No solution in 18.5 or 17.5, so C++ (2018-12-8)
comment
Keywords: Unique Proof Game, En passant, Castling, Promotion (S), Valladao Task
Genre: Retro
Reprints: 96 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-11-13 more...
29 - P0002288
Ernest Clement Mortimer
Andrey Frolkin

Die Schwalbe 71 10/1981
P0002288
(15+13) C+
BP in 4,0
1. Sf3 e5 2. Sxe5 Se7 3. Sxd7 Sec6 4. Sxb8 Sxb8
play all play one stop play next play all
Version A. Frolkin. Die Originalfassung war mit sBd5 und e7.
Another version is reflected left-to-right.
YM: Possible symmetrical game:

BP in 4,0 (15+13) C+

1. Sc3 d5 2. Sxd5 Sd7 3. Sxe7 Sdf6 4. Sxg8 Sxg8

and even improved versions:

BP in 4,5 (13+15) C+

1.e3! (tempo) Sf6 2.e4 Sxe4 3.Se2 Sxd2 4.Sc3 Sxb1 5.Sxb1.

BP in 4,5 (13+15) C+

1.d3! (tempo) Sc6 2.d4 Sxd4 3.Sd2 Sxe2 4.Sf3 Sxg1 5.Sxg1. (2016-9-27)
A.Buchanan: These days, the style seems to be more common to mark as "BP in exactly 4.5", if a shorter proof game exists. (2018-10-1)
Olaf Jenkner: Isn't it anticipated by Schweig (P0002287) ? (2018-10-1)
A.Buchanan: Olaf: there is much to unwind here.
Firstly, this is Mortimer v Frolkin. There is no way to indicate the dependency in the Author fields. There is a field called "After" but there is no known way to search that field (see PDB FAQ examples). But putting this information in the Solution Text field is no answer, as this field too is unsearchable! I suggest that this information can best be placed in the Comment field (not UserComment).
Secondly, we don't know when Mortimer published his original: but his 12 publication dates here are between 1917 & 1935, while Schweig's composition is 1938.
It would be good to confirm the original publication date, but Schweig may have been anticipated. (2018-10-1)
comment
Keywords: Unique Proof Game, Homebase (2), Impostor (s)
Genre: Retro
Reprints: 100 Shortest Proof Games 11/1991
(5) diagrammes 103 10-12/1992
6 Introduction to Proof Games 03/2010
06b The Puzzling Side of Chess 8 18/08/2012
72 The Puzzling Side of Chess 141 16/12/2018
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-1 more...
30 - P0002289
Andrey Frolkin
Andrej N. Kornilow

2235 diagrammes 92 01-03/1990
P0002289
(14+14)
BP in 21,0
1. f3 Sc6 2. Kf2 Sd4 3. Kg3 Sxe2+ 4. Kg4 Sg3 5. hxg3 Tb8 6. Th5 Ta8 7. Ta5 Tb8 8. Lb5 Ta8 9. c4 Tb8 10. Dc2 Ta8 11. Dg6 Tb8 12. d3 Ta8 13. Ld2 Tb8 14. Le1 Ta8 15. Sd2 Tb8 16. Tc1 Ta8 17. Tc3 Tb8 18. Tca3 Ta8 19. T3a4 Tb8 20. a3 Ta8 21. Lxd7+ Dxd7+
play all play one stop play next play all
Henrik Juel: Natch 3.1 tests the first 20.0 moves OK in 13 seconds, but the first 20.5 moves would take more than an hour, and the entire problem more than a couple of hours, because of the possibility of [Pd7] promoting
So we may never know for sure whether this proof game with 16 oscillations by Ta8 is correct (2018-12-8)
Mario Richter: Henrik, I think certainty about the correctness of this problem can be achieved, if we take into account that Black's last move must have been a capture. (2018-12-10)
A.Buchanan: Henrik: the times you propose for testing don't seem outrageous, even without Mario's sensible heuristic. Also, the last move must have been DxLd7 from one of 5 squares only. (2018-12-12)
more ...
comment
Keywords: Unique Proof Game
Genre: Retro
Reprints: 101 Shortest Proof Games 11/1991
58b 64 Proof Games 2012
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2012-12-26 more...
31 - P0002302
Kostas Prentos
5426 feenschach 89 10-12/1988
Ehrende Erwähnung
P0002302
(14+13)
BP in 18,0
1. c4 Sc6 2. c5 Se5 3. c6 dxc6 4. Db3 Lh3 5. Kd1 Sg4 6. Kc2 Dd3+ 7. Kxd3 0-0-0+ 8. Ke4 f5+ 9. Kxf5 e6+ 10. Kxe6 Lc5 11. Kf7 Td6 12. Kf8 Se7+ 13. Dg8 Sh6 14. b3 Ld7 15. La3 Le8 16. Lb4 Td8 17. Sa3 Ld6 18. Tc1 Txg8#
play all play one stop play next play all
paul: 2 x Indian theme. (2018-11-9)
Henrik Juel: Euclide 1.01 ran for more than an hour, producing nothing
But the first 17.5 moves were tested correct in 8 minutes (2018-11-9)
Henrik Juel: Good proof game, considering its age
The black bishops go Lc8-h3-d7-e8 and Lf8-c5-d6 with interferences (including a swithcback by Td8) after their first moves to let Kf8 through (2018-11-9)
François Labelle: The last move must be Th8xg8, so Henrik's test in 17.5 moves plus three similar tests with white S, L, T at g8 (returning no solutions) should be considered an HC+ proof of correctness. (2018-11-10)
Henrik Juel: Good point, Francois
What does HC+ stand for? (2018-11-10)
Henrik Juel: ... never mind
It must mean correct by Computer testing with some (correct) Human reasoning added
If so, HC+ is the label we can use with many other retros, where human reasoning rules out a castling, etc. (2018-11-10)
comment
Keywords: Bahnung, Räumung, Unique Proof Game, Castling
Genre: Retro
Reprints: 128 Shortest Proof Games 11/1991
H23 FIDE Album 1986-1988 1995
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2014-11-6 more...
32 - P0002312
Kostas Prentos
5673 feenschach 93 11-12/1989
P0002312
(14+11)
BP in 17,5
1. e3 b5 2. Ld3 b4 3. Lg6 b3 4. axb3 hxg6 5. Ta5 Th3 6. Tb5 Tg3 7. hxg3 a5 8. Th8 a4 9. Dh5 a3 10. Se2 Ta4 11. bxa4 gxh5 12. b3 g6 13. Lb2 Lh6 14. Lg7 Lg5 15. Lh6 Lh4 16. gxh4 a2 17. Sg3 a1=T 18. Txg8#
play all play one stop play next play all
Henrik Juel: The content is concealed pawn captures
Despite no visible captures White captured a2xPb3xTa4 to open the a-line for [Ta1,Pa7], and h2xTg3xLh4 with black h7xLg6xDh5 to open the h-line for [Th1,Th8]
This makes life difficult for the human solver and for Natch 3.1, who tested the first 15.0 moves correct in 40 sec.
Testing the entire proof game would need more than a couple of hours by Natch (2018-12-8)
comment
Keywords: Unique Proof Game, Promotion (t)
Genre: Retro
Reprints: 143 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2014-11-7 more...
33 - P0002313
Yaakov Mintz
The Problemist 1987-1988
3.-5. ehrende Erwähnung e.a.
P0002313
(12+11)
BP in 17,5
1. f3 e5 2. Kf2 e4 3. De1 e3+ 4. Kxe3 Ke7 5. Dg3 De8 6. Kf2 Kd8 7. Ke1 Lc5 8. Kd1 Lxg1 9. De1 Lxh2 10. Txh2 d6 11. Txh7 Le6 12. Txg7 Th1 13. Th7 Lxa2 14. Th8 Lxb1 15. Txa7 b5 16. Tb7 Ta1 17. Ta7 b4 18. Ta8
play all play one stop play next play all
Cook: NL
1. f3 e5 2. Kf2 e4 3. De1 e3+ 4. Kxe3 b5 5. Dg3 b4 6. Kf2 Lc5+ 7. Ke1 Lxg1 8. Kd1 Lxh2 9. Txh2 d6 10. Txh7 Le6 11. Txg7 Th1 12. Th7 Lxa2 13. Th8 Lxb1 14. Txa7 Ke7 15. Tb7 Ta1 16. Ta7 De8 17. Ta8 Kd8 18. De1 (Mario Richter)
paul: C+ (Euclide 1.11) for the first 13 moves (in about 51 hours). I do not dare to check for 13.5 moves. (2018-3-8)
Henrik Juel: Tiny typo in Mario's cook: 10.Txh7 (2018-3-8)
Mario Richter: The typo comes from a "by hand conversion" of the output of several tools I'm using (here: rawbats and chessbase) - unfortunately each tool has it's own output format, incl. the PDB solution field format ... (2018-3-9)
A.Buchanan: I have a janitor's tool which allows me to change the representation of positions & solutions.
Try to copy the file here: https://www.dropbox.com/sh/ld64s00zm0f9tx8/AAA7r8BsA0vuLcZOOKNvKkmua?dl=0
Click on it, and then hit the download button on the right.
The most useful is the one which converts from FEN to PDB "pieces" format.
Stick the input string in the yellow cell, and pick up the result from the green cell.
If you want to see how it's done, unhide the hidden rows and columns: no VBA just simple Excel.
Only 1% as clever as rawbats, but it still saves me a lot of time.
Feel free to use and to improve. (2018-3-9)
Mario Richter: @Andrew: Thanks for your offer - but I have such tools myself. My fault was not to use them (I thought that I'll be able to transform such a short PG by hand without errors ...)
Would be nice if the PDB-System would be more helpful with respect to language support.
I've decided to use 'english' in the language settings, but that doesn't help here, since solutions still have to be given in german piece notation.
Might be difficult to change this, especially when thinking of fairy piece names, so I can live with that, but there are other aspect which sometimes drive me crazy, e.g. the handling of source names in different languages ... (2018-3-9)
A.Buchanan: I thought you might have such a tool, but I thought it was a nice opportunity to announce it for others who might find it useful. (2018-3-9)
Henrik Juel: this problem should be labelled cooked (2018-12-8)
more ...
comment
Keywords: Unique Proof Game, Interchange, Belfort
Genre: Retro
Reprints: 144 Shortest Proof Games 11/1991
Best Problems 47 07/2008
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-3-9 more...
34 - P0002314
Valentin Balanovsky
Andrey Frolkin

Mat (Belgrad) 1985
P0002314
(11+14)
BP in 18,0
1. h4 d5 2. Th3 d4 3. Ta3 Lh3 4. Txa7 e6 5. a4 Ld6 6. Ta3 Lh2 7. Tf3 d3 8. Tf6 Dd4 9. f4 Dxb2 10. Kf2 Dxc1 11. Ke3 Dxd1 12. Kd4 Dxf1 13. Kc3 Dxg1 14. Kb2 De3 15. Kc1 Sd7 16. Kd1 0-0-0 17. Ke1 Kb8 18. Txb7+ Ka8
play all play one stop play next play all
Version A. Frolkin
Henrik Juel: Cooked by
1.Ba2-a4 Bd7-d5 2.Ta1-a3 Bd5-d4 3.Bh2-h4 Lc8-h3
4.Ta3-f3 Be7-e6 5.Tf3-f6 Lf8-d6 6.Sb1-a3 Ld6-h2
7.Bf2-f4 Bd4-d3 8.Ke1-f2 Dd8-d4 9.Kf2-f3 Dd4xg1
10.Dd1-e1 Dg1xf1 11.De1-f2 Df1xc1 12.Df2xa7 Dc1xb2
13.Kf3-f2 Db2-e5 14.Da7-e3 Sb8-d7 15.Th1-b1 O-O-O
16.Kf2-e1 Kc8-b8 17.Tb1xb7 Kb8-a8 18.Sa3-b1 De5xe3
with lots of variations (2018-12-6)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Reprints: 145 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-1-10 more...
35 - P0002315
Jasper van Atten
Probleemblad 1985
4.-5. ehrende Erwähnung
P0002315
(16+15)
BP in 23,0
1. d4 g6 2. Kd2 Lg7 3. Ke3 Lf6 4. Kf4 Le5+ 5. Kg5 Sf6 6. Kh6 Lf4+ 7. Kg7 Lh6+ 8. Kxh8 Lf8 9. Lh6 Sg8 10. e3 f6 11. Dh5 Kf7 12. Sf3 Ke6 13. Lc4+ Kd6 14. Td1 De8 15. Td3 Df7 16. Ta3 Dd5 17. Sc3 Ke6 18. Ta6+ Kf7 19. a3 De6 20. Dc5 Ke8 21. Se5 Df7 22. Le6 Kd8 23. Sd5 De8
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (59 min.)
The content is given by the diagram position: Get wKe1 to h8 and interchange the black royals
Lf8 makes the roundtrip f8-g7-f6!-e5-f4-h6-f8
[Dd8] goes d8-e8-f7-d5-e6!-f7-e8
Resentful of the dissipation by some of his officers [Ke8] wastes no time going e8-f7-e6-d6-e6-f7-e8-d8 (2018-12-8)
comment
Keywords: Unique Proof Game
Genre: Retro
Reprints: 149 Shortest Proof Games 11/1991
Best Problems 47 07/2008
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2010-6-4 more...
36 - P0002318
Andrey Frolkin
The Problemist 1989
3. Preis
P0002318
(31+0)
Färbe die Steine!
BP in 17,5
1. e4 c5 2. Dg4 Da5 3. De6 fxe6 4. Ke2 Kf7 5. Kf3 Kf6 6. Kg4 Ke5 7. Kg5 h5 8. Kg6 Kf4 9. Kf7 Sh6+ 10. Ke8 Sf7 11. Lb5 Th6 12. d3+ Dd2 13. g4 a5 14. Sh3+ Kf3 15. g5 Ke2 16. Sg1+ Ke1 17. h3 Dd1 18. Sf3++
play all play one stop play next play all
Henrik Juel: The capture was fxDe
If White made it, Dd1 is white and so is Ke1, but he would stand in an illegal check from sPf2
So Dd1 and Ke1 are black (and Ke8 is white), and the rest of the men have a 'natural' color because of the shortish proof game, which is
C+ by Natch 3.1 (2 sec.) (2018-12-8)
comment
Keywords: Unique Proof Game, Coloring problem
Genre: Retro
Reprints: 155 Shortest Proof Games 11/1991
feenschach 137 08-09/2000
Input: Gerd Wilts, 1995-6-3
Last update: TBr, 2015-11-22 more...
37 - P0002319
Andrey Frolkin
Leonid Lyubashevsky

The Problemist 1988
1. Preis
P0002319
(30+0)
Färbe die Steine!
BP in 19,5
1. h4 h5 2. Th3 Th6 3. Tb3 Ta6 4. g3 g6 5. Lh3 Lh6 6. Le6 Le3 7. dxe3 dxe6 8. Ld2 Kd7 9. Lb4+ Kc6 10. Sc3 De8 11. Dd8 Sd7 12. 0-0-0 Sdf6 13. Kb1 Dd7 14. Ka1 Se8 15. Tb1 Dd1 16. Sd5 Kb5 17. Ld6+ Ka4 18. Tb6 Ld7 19. Sb4 Lb5 20. b3+
play all play one stop play next play all
Henrik Juel: The fastest captures are d2xLe3 and d7xLe6, so Lb5/Ld6 are black/white respectively
If Ka4 were white, so that Ka1,Tb1 would be black, more than 19 black moves would be needed
So Ka1, Tb1 (and Tb6) are white, needing white castling, which entails that Dd8 is white, because this saves a white move; then Dd1 and Ta6 are black, and the rest are 'naturally' colored, with Sb4/Se8 white/black
The colored position is C+ by Natch 3.1 (0.3 sec.)
The position after switching the colors of Sb4/Se8 cannot be reached in 19.5 moves (2018-12-8)
comment
Keywords: Unique Proof Game, Coloring problem, Castling
Genre: Retro
Reprints: 588 Ukrainisches Album 1986-1990
156 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-27 more...
38 - P0002320
Andrey Frolkin
Henri Nouguier

(8) diagrammes 92 01-03/1990
4. ehrende Erwähnung
P0002320
(31+0)
Bestimme die Art und Farbe der Steine für eine KBP!
1. h4 Sh6 2. Th3 Sf5 3. Te3 Sd4 4. Te6 dxe6 5. e3 Dd7 6. Lb5 Kd8 7. De2 De8 8. Ld7 Sbc6 9. Kd1 Tb8 10. De1
play all play one stop play next play all
Henrik Juel: The decoding is easy, with letters ABCDEF representing the men DKPLST; the coloring is natural, with Ld7 being white
The shortest proof game lasts 9.5 moves and is
C+ by Natch 3.1 (2018-12-8)
comment
Keywords: Letter problem, Unique Proof Game
Genre: Retro
Reprints: 591 Ukrainisches Album 1986-1990
159 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-10 more...
39 - P0002333
Jasper van Atten
The Problemist 1987-1988
3.-5. Ehrende Erwähnung
P0002333
(16+15)
BP in 19,0
1. e4 Sf6 2. Lc4 Sd5 3. d3 f6 4. Lf4 Kf7 5. Dh5+ Ke6 6. Se2 De8 7. 0-0 Dg6 8. Kh1 Dg3 9. De8 De3 10. fxe3 Sc6 11. Tf3 Se5 12. Th3 Kd6 13. Sg3 Sb4 14. Lf7 Kc6 15. c4 Sg4 16. Sc3 Sh6 17. Tg1 Sg8 18. Th6 Sa6 19. h3 Sb8
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (1 min.) (2018-12-8)
comment
Keywords: Unique Proof Game, Interchange (ss), Castling
Genre: Retro
Reprints: 70 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-1-10 more...
40 - P0002373
Alexander Kislyak
Die Schwalbe 136 08/1992
P0002373
(12+7)
BP in 15,5
1. d3 Sh6 2. Lxh6 c5 3. Lxg7 c4 4. Lxf8 c3 5. Lxe7 cxb2 6. Lxd8 0-0 7. c4 Kh8 8. c5 Tg8 9. c6 Txg2 10. c7 Txh2 11. Lh3 d5 12. Lxc8 f5 13. Lxb7 f4 14. Lxa8 f3 15. Lxd5 fxe2 16. Lf6#
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (3 min.) (2018-12-8)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-27 more...
41 - P0002473
Waleri A. Liskowez
(5) Die Schwalbe 69 06/1981
P0002473
(7+3)
#2 BG

Quick solution:
Partial solutions in a specific order.
I 1. dxe6ep a try by the BG-logic (beruehrt-gefuehrt) with no
justification 1. ... 0-0-0 2. Bb7#. If rejected, the key must be returned back:
II 1. Nxe5 capturing the touched wP. (1. ... 0-0-0??)
NOT:
1. Nc5/Nxe5? 0-0-0!
II 1. Nc5/Ke6?? illegal by the rule of touching chessmen.
(II 1. Kxe5?)
Castling implies ep.

Detailed solution:
We don't know if Black castling or White e.p. capture are legal. We do know that if castling is legal, then so is e.p. because Black's last move was certainly e7-e5.
If e.p. is legal, then we have a solution, whether castling is legal or not.
1. dxe6ep! [2. Rf8#]
1. ... O-O-O 2. Bb7#
And we have a number of tries stopped only if castling is legal:
Try: 1. Ke6?/Sc5?/Sxe5? [2. Rf8#]
But 1. ... O-O-O!
So how to tie these facts together? We are going to try out moves, and this will force the opponent to specify the pre-history of the game in his favour. Each phase we will label with Roman numbers.
Suppose we try I) 1. dxe6ep. UNDER SO-CALLED "TOUCH-MOVE" BLACK CAN DEFEND BY DEFINING THE HISTORY OF THE GAME SUCH THAT A THREAT IS ILLEGAL, AND MUST BE RETRACTED. This way of resolving uncertainty is the key to the modern Touch Move convention. The confusing part is that it actually has relatively little to do with Touch Move! This is the secret that you weren't being told!
Now we have to retract 1. dxe6ep. What have we gained? Well we know that ep is illegal, and therefore castling doesn't work either. There is a price to be paid: that we must follow the touch move rule. So although it appears that all of II) 1. Ke6/Sc5/Sxe5 will work, in fact only the last, II) 1. Sxe5, is valid, by the touch-move rule. wPd5 can't move except for the e.p. which we know now isn't going to happen, but we must still capture bPe5 if possible.
Suppose that instead we had begun by trying one of I) 1. Ke6/Sc5/Sxe5. Black can defend by saying that castling is legal, and indeed just plays it I) 1. ... 0-0-0! There is no retraction possible, because none of the White moves were illegal.
A.Buchanan: See my solution. The penny has dropped and I will adjust the definition of Touch Move so that others aren't struggling in ignorance.
I still have no idea how "PR" ("PRA?") & "PF" fit into this problem: they don't seem to be necessary if BG is defined properly. Please can Valery confirm my solution, and explain precisely how "PR" & "PF" contribute. (2018-10-7)
VL: Well, Andrew, your description of the solution is correct.
The mark "PR&PF" (or so) should be removed from this and other problems stipulated BG. It was (and remains) significant only in the general context for the explanation of the genuine nature and place of this hybrid genre in the framework of the family of controversial RA-genres (that is, ones connected with interacting move legalities). In view of this, I recommend to preserve PF as a keyword and even add PRA as such... (2018-10-7)
A.Buchanan: Valery: I have adjusted the stipulations as requested. I have not yet touched the keywords.
If I had a catalogue of pets, and classified a loyal dog called Fido, I would assigned him the keyword "dog". Although there are interesting genetic, evolutionary & cultural relationships between dogs and cats, I would not assign him the keyword "cat", because that would obscure more than it would help, particular to an audience of new and prospective pet owners. The relationship between dogs and cats is much better discussed, once, in the keyword definitions.
I would also make sure that before launching in to such advanced comparative discussions there was a clear, self-contained definition of the concept of "dog". This we still do not have in this database, either for dog or BG. In particular:
- What constrains or motivates the referee/opponent to accept or reject moves?
- Do the regular conventions (accept castling, reject en passant) play any role?
- In an adversarial game (direct or self play), can I reject or accept my opponent's move?
- As the player, do I keep playing moves until I have exhausted all possible partial solutions?
- Is there anything else important to say about BG itself?
Thanks so much! (2018-10-9)
comment
Keywords: Touch Move, En passant, Castling (sg), Post Factum (PF)
Genre: Retro
Reprints: Die Schwalbe 99 06/1986
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-9 more...
42 - P0002534
Dirk Borst
Markus Ott

FIDE Kongress 37 Belfort 07/1994
2. Preis
P0002534
(13+15)
BP in 15,0
1. h4 e5 2. Th3 Df6 3. Ta3 Lxa3 4. b3 Lxc1 5. Sc3 La3 6. Db1 Lf8 7. Kd1 Ke7 8. Kc1 Kd6 9. Kb2 Kc5 10. De1 Kb4 11. Kc1 Ka3 12. Kd1 Kb2 13. Sd5 La3 14. Se7 Kxa1 15. Sxg8 Lc1
play all play one stop play next play all
(note: location of BK is not thematic for Belfort Theme).
Henrik Juel: C+ by Natch 3.1 (9 hours)
The two Belfort officers are wSg8 and sLc1
Here is the added feature that [Lf8] goes to c1 (to capture wLc1), then back to f8 (to make room for [Dd1] and [Ke1] to interchange, while clearing the way for [Ke8]'s march to a1), and then to c1 a second time (2018-12-9)
more ...
comment
Keywords: Unique Proof Game, Belfort
Genre: Retro
Reprints: (24) diagrammes 110 07-09/1994
(8) feenschach 114 12/1994
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2014-12-21 more...
43 - P0002691
Per Olin
Suomen Tehtäväniekat 15/01/1992
P0002691
(1+1)
Ergänze 4 Bauern zu einem IC!
Wieviele Lösungen?

Typ 1: Dreieck wBa2-a4-c2: 3*12+5=41,
Typ 2: Dreieck wBd2-e2-e3-f2: 10-3=7,
Typ 3: Dreieck wBc4b3c3d3: 2*8=16.
Summe=41+7+16=64!
Per Olin: As published, the Black king was on d5. The problem was
dedicated to the Chess Day of Finnish Chess Federation 15 January 1992.

The solution as given by the composer:

There are three types of solutions.

Type 1) on the six squares triangle a2, a4 and c2 four white pawns can be placed in 15 different ways. Three out of these do not comply with the stipulation, e.g. pawns a2, a3, b2 and c2 is still illegal after removal of c2. Fulfilling the stipulation are 15 - 3 = 12 positions. Mirroring the positions is possible, as well as a similar arrangement of black pawns in NW corner. In the NE corner the white king decreases the amount of solutions to 5. Total of Type 1 is 3 x 12 + 5 = 41.

Type 2) Positions type white pawns d2, e2, e3 and f2 are, including Black's corresponding ones and excluding those included in type 1, altogether 7.

Type 3) A checking white pawn on c4 or e4, whose all starting squares are occupied. The occupying pawns can be 8 combinations of different colors. This gives 2 x 8 positions.

The total of Types 1 - 3 is 41 + 7 + 16 = 64. (2018-8-29)
comment
Keywords: Illegal cluster, only Kings
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-8-29 more...
44 - P0002795
Alexander Kislyak
32 Powerschennii Monarch 1993
P0002795
(9+13)
BP in 15,5
1. a4 Sc6 2. Ta3 Sd4 3. Tf3 Sxe2 4. Txf7 Sxc1 5. Txf8+ Kxf8 6. Lc4 De8 7. Lxg8 Txg8 8. f4 Kf7 9. Sf3 Ke6 10. 0-0 Kd5 11. c4+ Kxc4 12. Te1 Kd3 13. Te6 dxe6 14. De2+ Kxe2 15. a5 Sd3 16. Sc3#
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (57 min.)
The author made 64 proof games, all ending in Black being mated, on the 64 squares of the board
This is a neat model mate (2018-12-9)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-28 more...
45 - P0003038
Luigi Ceriani
4338v The Fairy Chess Review 3 28/11/1939
T. R. Dawson zum 50. Geburtstag
P0003038
(16+16)
BP in 26,0
1. h4 h5 2. Th3 Th6 3. Tc3 Te6 4. e3 Te4 5. De2 e6 6. Da6 La3 7. Lc4 De7 8. d3 Db4 9. Sd2 d6 10. Sdf3 Sd7 11. Ld2 Sdf6 12. 0-0-0 Ld7 13. Tf1 0-0-0 14. Se1 Tf8 15. Sgf3 Se8 16. Th1 Sgf6 17. Th3 Th8 18. Tg3 Th6 19. Tg5 Tg6 20. Ta5 Tg3 21. Lb5 Th3 22. Tc6 Th1 23. Sh2 Tf1 24. f3 Tf2 25. Lc3 Td2 26. Kb1 Td1#
play all play one stop play next play all
corrected version by V. Onitiu
Henrik Juel: Natch 3.1 did find a strategy, but otherwise nothing happened in more than an hour (2018-12-6)
comment
Keywords: Unique Proof Game, Castling, Capture-free
Genre: Retro
Reprints: The Fairy Chess Review 08/1940
147 La Genesi delle Posizioni 1961
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2014-5-22 more...
46 - P0003736
Giuseppe Brogi
1249 Sinfonie Scacchistiche 07-09/1972
P0003736
(12+12) cooked
h#2
b) wSa5
a) 1. f5 Le5 2. 0-0 Th8#
b) 1. Kd8 0-0-0 2. Te8 Lf8#
play all play one stop play next play all
Try to deduce the diagram error, as we do have the intended solutions!
a) wRh7 is original, but cannot have escaped from cage by white cross-capture as there are too many captures needed. On the other hand, Black only has to make 4 captures so the cross-capture is ok.
b) changing the colour of Sa5 shifts the capture balance: now White can cross-capture but not Black, so White but not Black can castle.
Thus the retro-logic works with the diagram as it is, but the forward logic does not. How can we repair the diagram?
A.Buchanan: Something odd going on here. There are numerous h#2 in both a&b. PRA not normally found in a problem with single solution for each twin. White has 8 pawns so trivially wRh7 must be original. (2018-10-13)
A.Buchanan: There are three similar problems by Brogi which are all twinned RS rather than PRA, but don't have diagram error. P0003743, P0003746 & P0003747. (2018-10-13)
comment
Keywords: Castling, Retro Strategy (RS)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-13 more...
47 - P0003821
Pierre Gre
RA23 diagrammes 18 11-12/1975
P0003821
(6+5)
h#2
1) 1. Lf8 0-0-0 2. Lb4 Sb1#
2) 1. Kb2 0-0 2. Lc3 Tfb1#
play all play one stop play next play all
NN: White can't have rights to castle on both sides as his only legal last moves are with wK or wRs. (2018-11-30)
more ...
comment
Keywords: Castling (wkwg), Partial Retro Analysis (PRA)
Genre: h#, Retro
Reprints: (3) StrateGems SG19, p. 156, 07/2002
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2017-12-4 more...
48 - P0004176
Leon Loewenton
(IV) Problem 33-36 02/1956
P0004176
(9+8) cooked
BP in 16,0
1. a4 Sf6 2. a5 Sd5 3. Ta4 Sb6 4. axb6 h5 5. bxc7 h4 6. cxd8=L h3 7. Lxe7 hxg2 8. Lxf8 gxh1=L 9. Lxg7 Lg2 10. Lxh8 Lxf1 11. Le5 Lxe2 12. Lxb8 Lxd1 13. Lg3 Lxc2 14. f4 Lxb1 15. Kf2 Lg6 16. Te4+ Kf8
play all play one stop play next play all
Cook: NL
1. a4 h5 2. a5 Th6 3. Ta4 Tb6 4. axb6 Sf6 5. bxc7 h4 6. cxd8=L h3 7. Lxe7 hxg2 8. Lxf6 gxh1=L 9. Lxg7 Lg2 10. Lxf8 Lxf1 11. Ld6 Lxe2 12. Lxb8 Lxd1 13. Lg3 Lxc2 14. f4 Lxb1 15. Kf2 Lg6 16. Te4+ Kf8
Henrik Juel: Jacobi got nowhere in more than an hour (2018-12-6)
Mario Richter: Cook found by rawbats:
1. a4 h5 2. a5 Th6 3. Ta4 Tb6 4. axb6 Sf6 5. bxc7 h4 6. cxd8=L h3 7. Lxe7 hxg2 8. Lxf6 gxh1=L 9. Lxg7 Lg2 10. Lxf8 Lxf1 11. Ld6 Lxe2 12. Lxb8 Lxd1 13. Lg3 Lxc2 14. f4 Lxb1 15. Kf2 Lg6 16. Te4+ Kf8 (2018-12-7)
Henrik Juel: Thanks for bringing your versatile program out, Mario
I was pretty sure that this proof game must be cooked, but could not show it by my own tools (2018-12-7)
comment
Keywords: Unique Proof Game, Promotion, under-promotion (L l), Promoted material on the board (wLg3 sLg6)
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-7 more...
49 - P0004263
George A. Teodoru
(11) Problem 52-54 08/1958
Lob
P0004263
(11+10)
BP in 19,0
1. a4 Sf6 2. a5 Sd5 3. Ta4 Sb6 4. axb6 Sc6 5. bxa7 Tb8 6. axb8=S Se5 7. Sxd7 c6 8. Sxf8 Lg4 9. Sxh7 Lxe2 10. Sg5 Lxf1 11. Se4 Le2 12. Sec3 Lxd1 13. Sa2 Lxc2 14. Ke2 Lf5 15. Ke3 Th3+ 16. Kf4 Ta3 17. Kg5 Lh3 18. Tg4 Ta8 19. Sa3 Kf8
play all play one stop play next play all
Henrik Juel: The given solution implies that wSg1 is missing in diagram
With this added, there are lots of cooks, e.g.
1.Sb1-c3 Sb8-c6 2.Ba2-a4 Ta8-b8 3.Ba4-a5 Sg8-f6
4.Ta1-a4 Sf6-d5 5.Sc3-a2 Sd5-b6 6.Ba5xb6 Bd7-d5
7.Bb6xa7 Bd5-d4 8.Ba7-a8=S Bd4-d3 9.Sa8-b6 Bd3xe2
10.Sb6-c4 Be2xf1=S 11.Ke1-e2 Tb8-a8 12.Ke2-f3 Sc6-e5
13.Kf3-f4 Sf1-e3 14.Kf4-g5 Bh7-h5 15.Dd1xh5 Se3xc2
16.Dh5xh8 Sc2-a3 17.Dh8xf8 Ke8xf8 18.Sc4xa3 Lc8-h3
19.Ta4-g4 Bc7-c6
With the given diagram position, the problem is also badly cooked (2018-12-6)
comment
Keywords: Unique Proof Game, Interchange
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-1-10 more...
50 - P0004299
Luis Alberto Garaza
(30) Problem 73-78 06/1961
1.-2. Preis e.a.
P0004299
(12+11)
#3
Längstzüger
31. TT
Henrik Juel: 1.0-0 Ta4 2.Ta1 Ta8 3.Txa8#
C+ by Popeye 4.61
But the real content is probably a proofgame showing how the position could be reached with the maximummer condition in effect throughout (2018-9-23)
Henrik Juel: The magazine issue can be downloaded as
http://problem64.beda.cz/silo/problem_73-78_1961.pdf
On p.39 in solution 30 a proof game in 171.0 moves is given
but I have not checked it (yet) (2018-9-24)
Henrik Juel: The given proof game seems OK, albeit with several typos
The main critical positions are:
after 74.Da1
k6s/1s1ppppp/1p1p2l1/pS1LPt1t/1P3L1P/1PPT4/3P1PP1/D3K2T (15+14)
Here the black knights are controlled as are the other black officers, allowing black pawn captures and the surprising 79... a1=T
after 127.Ld5
1Dsk3s/3ppppp/1p4l1/3LTt1t/1P3ptP/1PP2PS1/3P2P1/4K2T (13+14)
Now the black king can move to g8, after he has been helping out on the board, and we see the need for three black rooks as [Th1] is unavailable
after 151.Dc8
2D1s1k1/3ppppp/1p5s/3LTtt1/1P3PtP/1PP3p1/3P2P1/4K2T (12+13)
Now we can get the black king all the way to h8, and the rest is rather easy... (2018-9-24)
hans: 1. a3 Nc6 2. e3 Ne5 3. Nh3 Ng6 4. Nc3 Nh4 5. Nb5 Ng6 6. Nd6+ cxd6 7. Nf4 Qa5 8. Ne6 Qh5 9. Nc7+ Kd8 10. Na6 Qa5 11. Nb4 Qh5 12. Nc6+ Kc7 13. Qg4 Qa5 14. Qc4 Qh5 15. Ne5+ Kb6 16. Nf3 Qa5 17. Qb3+ Qb4 18. axb4 Ne5 19. Qa3 Nf6
20. Qa6+ Kc7 21. Nh4 Nc6 22. Ng6 Nb8 23. Be2 Ng4 24. Bf3 Ne5 25. Qa5+ b6 26. Qb5 Ba6 27. Bb7 Nc4 28. Nxf8 Ne5 29. h4 Nc4 30. Ng6 Rc8 31. Nf4 Rh8 32. Qf5 Rc8 33. Nd5+ Kd8 34. Nf6 Rc5 35. Qf4 Rh5 36. Qf5 Nc6 37. b3 Nd4 38. Bb2
Ne2 39. Be5 Na5 40. Bf4 Bd3 41. Qe5 Bg6 42. Qf5 Nc4 43. c3 Nd4 44. Ng4 Ne6 45. Ne5 Ng5 46. Nc6+ Kc7 47. Nd4 Rh8 48. Nb5+ Kb8 49. Nc7 Rc8 50. Ne8 Rc5 51. Qe4 Rf5 52. Qb1 Ra5 53. Qc1 Bb1 54. Qc2 Rf5 55. Bd5 Ne5 56. Qb2 Ng6 57. Qc2 Nh8 58. Bc4 Ra5 59. Qb2 Bg6 60. Bd3 Rf5 61. e4 Ra5 62. Nc7 Rf5 63. e5 Ne6 64. Na6+ Ka8 65. Bc4 Nd8 66. Ra5 Ne6 67. Rd5 Nd8 68. Rd3 Ne6 69. Nb8 Nd8 70. Nc6 Ne6 71. Nd4 Nd8 72. Nb5 Nb7 73. Bd5 a5 74. Qa1 dxe5 75. Re3 exf4 76. Re5 a4 77. Qa2 a3 78. Qb1 a2 79. Qd1 a1=R 80. Nc7+ Kb8 81. Nb5 Ra8 82. Nd4 Ra1 83. Nc6+ Kc7 84. Nd4 Ra8 85. Bc4 Ra1 86. Nc2 Ra8 87. Ba6 Rg8 88. Ne3 Ra8 89. Nd5+ Kd6 90. Qe2 Rg8 91. Qc4 Ra8 92. Re4 Rg8 93. Rd4 Ra8 94. Qc7+ Ke6 95. Qc4 Rg8 96. Qd3 Ra8 97. Nf6 Rg8 98. Ne8 Ra5 99. Nf6 Rag5
100. Qg3 Bb1 101. Rd3 Ra8 102. Qh3+ Rg4 103. Nd5 Rg8 104. Rd4 Bg6 105. Nc7+ Kf5 106. Ne8 Nc5 107. Qf3 Na4 108. Nc7 Ra8 109. Bc8 Ra5 110. Nb5 Ra8 111. Qd1 Ra5 112. Qa1 Ra8 113. Qa3 Ra5 114. Ba6 Nc5 115. f3 Ne6 116. Qa4 Ng5 117. Nd6+ Ke6 118. Ne4 Rf5 119. Rd5 Nh3 120. Ng3 Nf2 121. Re5+ Kd6 122. Qa5 Ne4 123. Qd5+ Kc7 124. Qb7+ Kd8 125. Bc4 Nd6 126. Qb8+ Nc8 127. Bd5 fxg3 128. f4 Ke8 129. Qa8 Kf8 130. Qb8 Kg8 131. Qd6 Na7 132. Qxg6 Nb5 133. Qc6 Nd6 134. Qa4 Ne8 135. Bb7 Nf6 136. Ba6 Ng6 137. Rd5 Nf8 138. Rd4 Ra5 139. Rc4 Rhb5 140. Rc5 Nh5 141. Qa3 Ne6 142. Qa4 Nd4 143. Qa3 Nf5 144. Qa4 Nh6 145. Rc4 Rbg5 146. Re4 Raf5 147. Re5 Nf6 148. Bc4 Ne8 149. Bd5 Nf6 150. Qa8+ Ne8 151. Qc8 Kh8 152. Qc6 Nc7 153. Qe6 Nb5 154. Qxf5 Na3 155. Qxg4 Nf5 156. Bb7 Nd6 157. Qe2 Ne4 158. Re6 Ra5 159. b5 Ra8 160. Bc8 Ra4 161. Ba6 Rd4 162. Qc4 Nd6 163. Re2 Ne4 164. Qb4 Nc4 165. Bb7 Ng5 166. Be4 Ne6 167. Bd3 Ng5 168. Qd6 Ne4 169. Qe6 Ng5 170. Qh3 Ne4 171. Qh2 Ne5 position (2018-9-24)
Henrik Juel: Thanks for supplying the intended proof game, Hans
It is remarkable what is possible with the max condition, but with the advent of unique proof games it has no longer much attraction, at least to me (2018-9-24)
comment
Keywords: Maximummer, Castling (wk)
Genre: Retro
Input: Gerd Wilts, 1995-6-3
51 - P0004300
Luis Alberto Garaza
(22) Problem 73-78 06/1961
3. Preis
P0004300
(8+10)
#3
Längstzüger
31. TT
Henrik Juel: 1.0-0 Sc6/Se6/Sf7 2.Tf8+/Txe6/Txf7
C+ by Popeye 4.61
But, like the previous problem, how could the position arise? (2018-9-23)
comment
Keywords: Maximummer, Castling (wk)
Genre: Retro
Input: Gerd Wilts, 1995-6-3
52 - P0004367
Andrey Frolkin
560 Europe Echecs 403 07-08/1992
P0004367
(10+12) cooked
KBP
a) Weiß am Zug
b) Schwarz am Zug
a) 1. e4 h5 2. Dxh5 Txh5 3. h3 Txh3 4. a3 Txa3 5. Txa3 a6 6. Txa6 Sf6 7. Txf6 gxf6 8. Th6 Lxh6 9. d3 Lxc1
b) 1. d3 h6 2. Lxh6 Txh6 3. h4 Txh4 4. a4 Txa4 5. Txa4 a6 6. Txa6 Sf6 7. Txf6 gxf6 8. Th6 Lxh6 9. Dc1 Lxc1 10. e4
play all play one stop play next play all
Cook: Duale
a) 1. e4 h5 2. Dxh5 Txh5 3. h3 Txh3 4. a3 Txa3 5. Txa3 a6 6. Txa6 Sh6! 7. Tf6 gxf6 8. Txh6 Lxh6 9. d3 Lxc1
b) 1. d3 h6 2. Lxh6 Txh6 3. h4 Txh4 4. a4 Txa4 5. Txa4 a6 6. Txa6 Sh6! 7. Tf6 gxf6 8. Txh6 Lxh6 9. Dc1 Lxc1 10. e4
paul: Dual: a) 6.- Sh6! 7.Tf6 gxf6 8.Txh6 Lxh6 9.d3 Lxc1. (2010-7-30)
Henrik Juel: Part b) is also ruined, by the same dual (2018-12-9)
Henrik Juel: ... almost the same, namely
6... Sh6 7.Tf6 gxf6 8.Txh6 Lxh6 9.Dc1 Lxc1 10.e4 (2018-12-9)
comment
Keywords: Unique Proof Game
Genre: Retro
Reprints: (12) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-10 more...
53 - P0004368
Alexander Kislyak
561 Europe Echecs 403 07-08/1992
P0004368
(16+16)
BP in 25,0
1. g4 g5 2. Lg2 Lg7 3. Ld5 Ld4 4. Lc4 Lc5 5. d4 d5 6. Ld2 Ld7 7. La5 La4 8. Dd2 Dd7 9. Db4 Db5 10. Sc3 Sc6 11. 0-0-0 0-0-0 12. Td3 Td6 13. Tf3 Tf6 14. Tf4 Tf5 15. Sf3 Sf6 16. Td1 Td8 17. Td3 Td6 18. Sd1 Sd8 19. Tb3 Tb6 20. Dc3 Dc6 21. Tb4 Tb5 22. b3 b6 23. Kb2 Kb7 24. Ka3 Ka6 25. Sb2 Sb7
play all play one stop play next play all
Sebastian Natschke: Es gibt eine Nebenlösung mit 8. Dd3 Dd6 9. Da3 Da6 und dann 20. Tb4 Tb5 21. Dc3 Dc6 (2018-9-27)
comment
Keywords: Unique Proof Game, Castling, Symmetrical position, Capture-free
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2014-5-22 more...
54 - P0004532
György Paros
Magyar Sakkelet 1954
1. Preis
P0004532
(5+9) C+
h#3
2 Lösungen
1) 1. 0-0-0 0-0 2. Kb7 Tfb1+ 3. Ka6 Txa4#
2) 1. Lxe4 0-0-0 2. 0-0 Tdg1+ 3. Kh7 Txh5#
play all play one stop play next play all
Da Schwarz am Zug ist, muß Weiß im letzten Zug entweder einen der Türme oder den König gezogen haben. Es ist deshalb nur eine der beiden Rochaden legal.
klären: Retrogehalt? darf Weiß rochieren?
klären award: 1. oder 2. Preis?
Sally: Magyar Sakkelett, 1954 2. Preis.
hier sind in der Stellung zwei Probleme versteckt. Durch Retro Analyse kann bewiesen werden, dass die Rochade für W. zulässig ist. Von den beiden Möglichkeiten ist jeweils aber nur eine real. Die beiden Lösungen sind selbstständig. Die Zugabe der s. Rochaden ist ein wertvolles Plus. (2018-11-6)
Henrik Juel: Now we would consider this to display one solution in two parts and omit the stipulated '2 solutions' (2018-11-6)
more ...
comment
Keywords: Partial Retro Analysis (PRA), Castling
Genre: h#, Retro
Reprints: 1313 FIDE Album 1945-1955 1964
(VI) Problem 152-156 04/1973
(17) StrateGems SG19, p. 159, 07/2002
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2017-12-2 more...
55 - P0004845
Dmitri W. Pronkin
4833v Die Schwalbe 1984
1. Preis
P0004845
(14+1)
BP in 26,5
1. Sh3 g5 2. Sf4 gxf4 3. Sa3 f3 4. gxf3 Sf6 5. Lg2 Se4 6. fxe4 d5 7. exd5 Sc6 8. dxc6 Dd3 9. exd3 h5 10. Dg4 hxg4 11. cxb7 g3 12. hxg3 f5 13. Th2 f4 14. gxf4 e5 15. fxe5 Ld6 16. exd6 Th3 17. dxc7 Te3+ 18. fxe3 a5 19. Kf2 Ta6 20. Kg3 Tc6 21. Kh4 Tc3 22. dxc3 Le6 23. Ld2 Lb3 24. cxb3 a4 25. bxa4 Kf7 26. Ld5+ Kg6 27. Lf7+
play all play one stop play next play all
Henrik Juel: Mario, can your rawbats test this one? (2018-12-9)
Mario Richter: White pawns captured all missing black men, and we know exactly on which squares all these captures took place. So one testing idea would be to generate all possible mappings M: BLACK_PIECES -- CAPTURE_SQUARES and use these mappings as constraints for programs like 'jacobi' or 'rawbats'.
The main task is to find a subset M' of M which reduces the number of test cases from approx. 15! to a manageable size.
Can you provide some mathematical/logical insight how this might be done?! (Some observations that might be helpful are: Bishops could only have been captured on squares of their own color, Ph7 captured at least once and he or Pg7 either promoted or did the last remaining black capture,so most of the other black pawns never left their homefile, ...) (2018-12-10)
Henrik Juel: I have no further insights, Mario (2018-12-11)
comment
Keywords: Unique Proof Game, Massacre PG
Genre: Retro
Reprints: 118 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-12-28 more...
56 - P0004893
Waleri A. Liskowez
Bulletin Central Chess Club USSR 1970
3.-4. Preis e.a.
P0004893
(12+13)
#4 BG
Partial solutions in a specific order.

1. e6? 0-0-0! I 1. exd6ep+ a try by the the BG-logic (beruehrt-gefuehrt) with no justification. If rejected, the key must be returned back:
II 1. e6 (1. ... 0-0-0??) by the touched P only! 1. ... Bxb5/gxf6 2. exf7++ (2. ... Kd7 3. Qd7+/bxc6+)
The second key is compatible with the rule of touching chessmen.
The last move? h7xg6 locks wRh8. e6xf5?? illegal (all 3 captures
could not be on light squares). Thus, castling implies ep
play all play one stop play next play all
VL: It seems to be the first BG-problem with
a legal position (cf. P0006091). (2005-7-21)
A.Buchanan: There are broadly two different types of BG problem. The older ones (from 18xx) are retractors, and in some the diagram position is legal (e.g. P1354447 1885). More modern BG compositions have forward stipulations after conventional retro-analysis, and would normally be legal positions. (2018-10-7)
comment
Keywords: Touch Move, Partial Retro Analysis (PRA), Castling
Genre: Retro
Reprints: (1) Die Schwalbe 69 06/1981
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-9 more...
57 - P0004967
Lothar Finzer
(X) Die Schwalbe 16 10/1972
P0004967
(14+10)
#2
R: 1. 0-0-0, dann 1. Kd2 (BG) ... 2. Sc1#
play all play one stop play next play all
1. Kb1? ... 2. Lb2# - aber S hat keinen letzten Zug. Wenn W zuletzt gezogen hat, dann stellt nur R: 0-0-0 die schwarze Retrobeweglichkeit wieder her.
ABER: Wegen des sUW-Lf1 war die w0-0-0 illegal. W nimmt die illegale Rochade zurück und macht stattdessen wegen Berührt-Geführt den K-Zug 1. Kd2, gefolgt von 2. Sc1#
more ...
comment
Keywords: Joke, Touch Move, Castling, Illegal position, Retract illegal move, Promoted material on the board (L)
Genre: Retro, 2#
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-10-7 more...
58 - P0005301
Ludwig Zagler
3673 Problemkiste 98 04/1995
P0005301
(1+2)
-1(w+s), dann h#1
Anticirce
R: 1. Ka7-a8 Lc7xDe5[+sLf8], dann 1. Kd8 De8#
play all play one stop play next play all
Gerald Ettl: Wichtig Typ Calvet. Nicht schlecht. (2009-2-10)
Alfred Pfeiffer: Beim Typ Calvet sind Schläge auf das eigene Wiedergeburtsfeld erlaubt. Wäre deshalb hier nicht der Typ Cheylan zu fordern, um 2. Kxe8 auszuschließen ? (2018-12-6)
Henrik Juel: You are right, Alfred (2018-12-7)
Gerald Ettl: ja das stimmt. (2018-12-7)
comment
Keywords: Circe (Anti-), Help retractor, Aristocrat, Rex solus (w)
Genre: Retro, Fairies
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-6 more...
59 - P0005325
Michel Caillaud
13 Rex Multiplex 1 01-03/1982
3. ehrende Erwähung
P0005325
(12+8)
#2
b) wKa4 nach a3
a) 1. Dd6? Th4!
1. Sc6! droht 2. Dd8# (1. ... 0-0?? illegal)

b) 1. Sc6? 0-0!
1. Dd6! droht 2. Lb5#
R: 1. g6-g5 Kb3xBa3 2. h7xTg6 Kc3xBb3 3. a4-a3 Kd3xBc3 4. a5-a4 Ke3xBd3 5. a6-a5 Dd5-d4 6. b4-b3 Dg2-d5 7. b5-b4 Df1-g2 8. b6-b5 Dd1-f1 9. b7-b6 Kf3-e3 10. d4-d3 Kg2-f3 11. d5-d4 Kf1-g2 12. d6-d5 Ld5-c4 13. c4-c3 Ke1-f1 14. c5-c4 Lg2-d5 15. c6-c5 Lf1-g2 16. c7-c6 g2-g3 17. Sg3-h1
play all play one stop play next play all
In a) fehlt ein Tempo zur Auflösung.
Schlagfälle: hxgxfxexd, e7xf6, h7xg6, wLc1, wTa1 auf a1, b1 oder c1.
Renny Bosch: The answer given as "a) 1. Sc3 0. 0?" was probably intended to be "a) 1. Sc6 0-0 2. ?", implying that in a) B may still have castling rights. But regardless of B's castling right, 1. Qd6 ... 2. Bb5# works in either case. Clearly there must be a reason why that is impossible in one of the two cases.

Most likely there is a misprint in the given position: wBc4 should be at b3. Then 1. Qd6 ... 2. Bc4# works in b) but not in a). And in a), the retro play shows that B can no longer castle, because he has to make a move after wKa4.

Also, the retro play as given leads to an initial position which is illegal, because with bPs at c7, d6, f6 and g7, the wB created on d8 would not be able to get out. And if the bPd6 were still at d7, then the bBc8 would not have been able to get captured by the wPh2. So bPb7 must already be at b6.

Here is a PG for a) that preserves B's castling right as long as possible, but in the end must lose it, leading to the #2.

1. Nc3 Nf6 2. Nb5 Ng4 3. h3 a6 4. hxg4 b6 5. Rh6 Bb7 6. Rf6 Be4 7. Nf3 Bf5 8. gxf5 exf6 9. Nh4 Qe7 10. Ng6 Qe6 11. fxe6 Nc6 12. e7 Rd8 13. exd8=B Bd6 14. Be7 Bh2 15. Bd6 Bg1 16. Bh2 Nd4 17. Na7 Nb3 18. Nb5 Nxa1 19. Na7 Nb3 20. Nb5 Nxc1 21. Na7 Nb3 22. Nb5 Nd4 23. Na7 Nf5 24. Nb5 Ng3 25. Na7 Nh1 26. g3 d6 27. Bh3 d5 28. Be6 d4 29. Kf1 d3 30. Kg2 c6 31. Kf3 c5 32. Ke3 c4 33. Qf1 c3 34. Qg2 b5 35. Qe4 b4 36. Qd4 b3 37. Kxd3 a5 38. Kxc3 a4 39. Kb4 a3 40. Kxa3 hxg6 41. Bxb3 g5 42. Kb4 Rg8 43. Ka4 Rh8 {the given position} 44. Nc6 Rg8 45. Qd8# (2008-5-16)
Michel Caillaud: in a), 1.Qd6? ~ 2.Lb5# doesn't work because of 1...Rh4! (2008-5-19)
Henrik Juel: Typos in the solution for part a)
Here are the correct solutions and tries:
a) 1.Sc6 thr. 2.Dd8# (1... 0-0?? is illegal), not 1.Dd6? Th4!
b) 1.Dd6 thr. 2.Lb5#, not 1.Sc6? 0-0!

Very elegant twinning (2018-12-4)
Henrik Juel: Thanks for your update, Alfred
There still are errors in the given retroplay
The black b-pawn should retract to b6 only, and the d-pawn all the way to d7
Then e7xTd8=L can be retracted, and [Lc8] is not locked out (2018-12-4)
comment
Keywords: Castling, Promotion
Genre: Retro
Reprints: B 64 Proof Games 2012
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-4 more...
60 - P0005393
Alexander Kislyak
38 Shakhmatnaya Kompozitsiya 04/1993
P0005393
(11+13)
BP in 16,0
1. e4 a5 2. De2 Ta6 3. Dxa6 a4 4. Dg6 hxg6 5. h3 Txh3 6. e5 Ta3 7. e6 Txa2 8. exd7+ Lxd7 9. Th3 e6 10. Ta3 Lb4 11. Sf3 Lc3 12. dxc3 Df6 13. Lg5 Se7 14. Lh4 g5 15. c4 Dg6 16. Sc3 Txa1+
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (1 hour 40 min.) (2018-12-9)
comment
Keywords: Unique Proof Game
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-1-10 more...
61 - P0005523
Hansjörg Schiegl
3724 Problemkiste 99 06/1995
P0005523
(2+2) cooked
-1(w+s), dann h#1
Circe
R: 1. Db6xDe3 De6-e3, dann 1. Sc6 Dd8#
play all play one stop play next play all
Cook: NL:
R: 1. Kf5xDf4 Dh2-f4, dann 1. Dc7 De6#
HBae: possible fix: wKf4 nach f2, wDe3 nach e1
R: 1. Da5xDe1 De6-e1, dann 1. Sc6 Dd8# (2018-11-13)
comment
Keywords: Circe, Help retractor, Aristocrat
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-11-14 more...
62 - P0005787
Andrey Frolkin
Leonid Lyubashevsky

Zaporizka pravda 1988
Spezialpreis
P0005787
(26+0)
Färbe die Steine!
KBP?
1. Sa3 d5 2. Sc4 Lg4 3. Se5 Lf3 4. Sg6 hxg6 5. gxf3 Th3 6. f4 Tg3 7. Lh3 c6 8. Lc8 e6 9. hxg3 Lb4 10. Th8 Lc3 11. bxc3 Ke7 12. La3+ Kf6 13. Db1 Sh6 14. Db6 axb6 15. Lf8 Ta3 16. Sh3 Tb3 17. axb3 Dd6 18. Ta8 Sa6
play all play one stop play next play all
Henrik Juel: The fastest pawn captures are a2xb3, b2xc3, g2xf3, h2xg3, and a7xb6, h7xg6
Surprisingly, in the intended coloring, the four men on row 8 are white; the rest is 'normal' (2018-12-9)
Henrik Juel: The colored position is C+ by Natch 3.1 (1 sec.)
No solution in 17.5 or 17.0 moves (2018-12-9)
comment
Keywords: Unique Proof Game, Coloring problem
Genre: Retro
Reprints: 586 Ukrainisches Album 1986-1990
(4) Die Schwalbe 144 12/1993
Input: Gerd Wilts, 1995-6-7
Last update: Gerd Wilts, 2005-12-27 more...
63 - P0005845
Unto Heinonen
U.S. Problem Bulletin 1993
1. Preis
P0005845
(16+16)
BP in 21,5
1. d4 h5 2. Lh6 Sf6 3. f4 Se4 4. Sf3 Sd2 5. e4 a5 6. La6 e5 7. c4 Lb4 8. Da4 c5 9. Dc6 b5 10. Lb7 Ta6 11. a4 Tb6 12. Sa3 Sa6 13. 0-0-0 Sf1 14. Td3 Le1 15. b4 Dh4 16. Tb3 Df2 17. h4 Kd8 18. Th3 d5 19. Tg3 Lh3 20. Tg6 f5 21. Tf6 g5 22. g4
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (1 min.) (2018-12-9)
comment
Keywords: Unique Proof Game, Castling, Ornament, Capture-free
Genre: Retro
Reprints: feenschach 121 11/1996
H28 FIDE Album 1992-1994 2001
feenschach 141 06/2001
Input: Gerd Wilts, 1995-6-20
Last update: A.Buchanan, 2014-5-23 more...
64 - P0005880
Michel Caillaud
R222v The Problemist 01/1994
Ladislav Packa gewidmet
P0005880
(12+14)
BP in 29,0
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. Th6 bxa1=T 6. Tc6 h5 7. Sh3 h4 8. Sf4 h3 9. Sd5 h2 10. f4 h1=T 11. Kf2 Txf1 12. Kg3 Thh1 13. a4 Sh6 14. g8=L dxc6 15. Lh7 Sd7 16. Lf5 Sb6 17. Lh3 Lf5 18. a5 e6 19. a6 Lc5 20. a7 Le3 21. dxe3 Dd6 22. Dd3 Kd7 23. Ld2 Th8 24. a8=D Lh7 25. Dg8 Ta8 26. Dgg6 Kc8 27. La5 Kb8 28. Sbc3 Ta1 29. Kh4 Dd8
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (21 min.)
A fantastic idea: By move 10 Black has promoted on a1,h1, so he has rooks in all four corners; during the next 18 moves the rooks interchange cyclically clockwise, motivated by the need for white to play a8=D-g8-g6
This leaves an ugly promoted wD on the board, whereas the promoted wLh3 is more discrete; maybe the author had a8=T in the first version, which was then cooked (2018-12-9)
comment
Keywords: Unique Proof Game, Non-standard material, Interchange (tttt)
Genre: Retro
Reprints: H32 FIDE Album 1992-1994 2001
(1) Quartz 18 10-12/2002
Input: Gerd Wilts, 1995-6-26
Last update: Gerd Wilts, 2006-1-11 more...
65 - P0005881
Yukio Hirose
Tume-Shogi Paradise 10/1994
P0005881
(12+16)
BP in 29,5
1. d4 f5 2. Lh6 gxh6 3. g4 Lg7 4. g5 Lf6 5. g6 Lh4 6. g7 Sf6 7. g8=T+ Kf7 8. Tg4 Tg8 9. Te4 Tg3 10. f4 fxe4 11. f5 Sd5 12. f6 Kg6 13. f7 Dh8 14. f8=S+ Kg5 15. Se6+ dxe6 16. b4 Ld7 17. b5 Sb4 18. b6 Lb5 19. d5 S8c6 20. d6 Tf8 21. d7 Tf2 22. d8=D Ta3 23. e3 Le2 24. D8d3 Db2 25. Da6 bxa6 26. b7 Sd4 27. b8=L c6 28. Lg3 Tg2 29. Lf2
play all play one stop play next play all
Henrik Juel: Diagram error: sKg5, not g6
Then C+ by Natch 3.1 (3 min.) (2018-12-9)
comment
Keywords: Allumwandlung, Ceriani-Frolkin Theme (DTS), Unique Proof Game
Genre: Retro
Reprints: The Problemist 01/1995
Input: Gerd Wilts, 1995-6-26
Last update: Gerd Wilts, 2005-12-28 more...
66 - P0005887
Valentin Balanovsky
4607 Mat (Belgrad) 07-08/1985
P0005887
(15+12) cooked
BP in 17,0
1. a4 h5 2. Ta3 h4 3. Tg3 hxg3 4. h4 Th6 5. h5 Tf6 6. h6 Tf3 7. h7 Sf6 8. Th6 Sh5 9. c4 f6 10. Db3 Kf7 11. Dxb7 Ke6 12. Dxc8 Kd6 13. Dxd8 Kc6 14. Dxf8 Kb7 15. Df7 Kc8 16. c5 Kd8 17. Da2 Ke8
play all play one stop play next play all
Cook: 1. c4 h6 2. Db3 h5 3. Dxb7 Th6 4. Dxc8 Tb6 5. c5 h4 6. a4 Sf6 7. Ta3 Sd5 8. Tg3 hxg3 9. h4 f6 10. Dxd8 Kf7 11. Dxf8 Kg6 12. Dg8 Sf4 13. Da2 Tb3 14. h5 Kf7 15. h6 Ke8 16. h7 Tf3 17. Th6 Sh5
Autorangabe: V. Z. Balanovskij SSSR,
Forderung: "Shortest game?" (kein Zusatz "2 Lösungen", und die mit 1. c4 beginnende BP ist explizit als NL gekennzeichnet).
Henrik Juel: Natch 3.1 found thousands of solutions, so badly cooked, regardless of the number of solutions stipulated (unless this number is 8605, but that would be silly) (2018-12-6)
comment
Keywords: Unique Proof Game, Pure Round Trip (k)
Genre: Retro
Input: Gerd Wilts, 1995-6-26
Last update: Mario Richter, 2018-12-7 more...
67 - P0005903
Jasper van Atten
R195 The Problemist 09/1993
P0005903
(14+15)
BP in 20,0
1. d3 a5 2. Le3 Ta6 3. La7 h5 4. e3 h4 5. Dh5 Tah6 6. Le2 T6h7 7. Dh6 b6 8. Lh5 Lb7 9. Ke2 La6 10. Kf3 a4 11. Se2 a3 12. Sxa3 h3 13. Tag1 hxg2 14. Sc1 gxh1=S 15. Tg4 Sf6 16. Tb4 Tg8 17. Sc4 Thh8 18. a3 Sh7 19. Ke4 Lc8 20. f3 Sa6
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (7 sec.) (2018-12-9)
comment
Keywords: Unique Proof Game, Loss of tempo (l3), Promotion
Genre: Retro
Input: Gerd Wilts, 1995-6-26
Last update: Gerd Wilts, 2006-1-11 more...
68 - P0005936
Nikita M. Plaksin
2999 feenschach 49 01-03/1980
2. Lob
P0005936
(11+14)
BP in 28,0
1. h4 a5 2. h5 a4 3. h6 Ta5 4. hxg7 h5 5. g4 Sh6 6. g8=L! Lg7 7. g5 Sc6 8. g6 Tg5 9. Th2 Le5 10. g7 f6 11. Lb3 axb3! 12. g8=L! b5 13. Lc4 d5 14. a4 dxc4! 15. a5 Dd3 16. a6 Dg3 17. e3 Sb4 18. Le2 Sa2 19. Kf1 Sxc1 20. f4 Sa2 21. fxg5 Lb7 22. g6 Lh1 23. g7 c3 24. g8=L! h4 25. Lc4 bxc4! 26. a7 Sg8 27. a8=L! h3 28. Lg2 hxg2!
play all play one stop play next play all
Henrik Juel: The moves edified by an exclamation mark are not particularly good or surprising
The marks just highlight the four white promotions to L and the black pawn captures getting rid of them (2018-12-6)
Henrik Juel: Many cooks, e.g.
1.Bg2-g4 Sb8-c6 2.Bh2-h4 Ba7-a5 3.Bh4-h5 Ba5-a4
4.Bh5-h6 Ta8-a5 5.Bh6xg7 Bh7-h5 6.Bg4-g5 Sg8-h6
7.Bg5-g6 Ta5-g5 8.Bg7-g8=L Lf8-g7 9.Th1-h2 Lg7-e5
10.Bg6-g7 Bf7-f6 11.Lg8-b3 Sc6-b4 12.Bg7-g8=L Ba4xb3
13.Ba2-a4 Sb4-a2 14.Lg8-c4 Bd7-d5 15.Ba4-a5 Bd5xc4
16.Ba5-a6 Dd8-d3 17.Ba6-a7 Dd3-g3 18.Be2-e3 Sa2xc1
19.Lf1-e2 Sc1-a2 20.Ke1-f1 Bb7-b5 21.Bf2-f4 Lc8-b7
22.Bf4xg5 Lb7-h1 23.Bg5-g6 Bc4-c3 24.Bg6-g7 Bh5-h4
25.Bg7-g8=L Bh4-h3 26.Lg8-c4 Sh6-g8 27.Ba7-a8=L Bb5xc4
28.La8-g2 Bh3xg2 (2018-12-6)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme
Genre: Retro
Input: Gerd Wilts, 1995-6-26
Last update: A.Buchanan, 2012-4-8 more...
69 - P0005946
Yis Yoront
5508 feenschach 91 05-08/1989
P0005946
(16+15)
Kürzeste BP, dann #1 (wer?)
1. h4 g5 2. hxg5 d6 3. Th4 Lh3 4. g4 Dd7 5. Lg2 Db5 6. Lc6+ Sd7 7. e4 0-0-0 8. Df3 Kb8 9. Db3 Dd3 10. Dxb7#
play all play one stop play next play all
FJS: "Einfaches Auszählen ergibt, daß beide Parteien schon mindestens 9 Züge gemacht haben. Eine 9-zügige Beweispartie ist leicht zu finden: "1.h4 g5 2.hxg5 d6 3.Th4 Lh3 4.g4 Dd7 5.Lg2 Db5 6.Lc6+ Sd7 7.e4 000 8.Df3 Kb8 9.Db3 Dd3, also ist Weiß am Zug: 10.Dxb7#
JV: "Ich würde sagen: Das ist eine Aufgabe für Retro-Unerfahrene." Retro für alle, wie GL das in der Schwalbe nennt. [2,6/II]
Henrik Juel: C+ by Natch 3.1 (2018-12-9)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-26
Last update: Alfred Pfeiffer, 2015-5-27 more...
70 - P0005949
Andrey Frolkin
Gerd Wilts
Alexander Kislyak

unveröffentlicht?
P0005949
(11+13)
a) BP in 15,5
b) -4 Züge, dann BP in 13,0
a) 1. a4 h5 2. a5 Th6 3. a6 Txa6 4. Txa6 bxa6 5. b4 Lb7 6. b5 Le4 7. b6 Lh7 8. e4 cxb6 9. Lxa6 Dc7 10. De2 Dxh2 11. Df1 Dxg1 12. Dxg1 f5 13. Df1 Kf7 14. Db5 Kg6 15. 0-0 Kh6 16. d3+
b) 1. a4 h5 2. a5 Th6 3. a6 Txa6 4. Txa6 bxa6 5. b4 Lb7 6. b5 Le4 7. b6 Lh7 8. e4 cxb6 9. Lxa6 Dc7 10. De2 Dxh2 11. Db5 Dxg1 12. Txg1 f5 13. Th1 Kf7
play all play one stop play next play all
Henrik Juel: Paradoxical twins
a) needs 31 single moves, but the position obtained after 27 single moves can be reached from the initial array in just 26 single moves, as shown in b)
There is no real paradox of course, in a) you must use an extra white move to preserve the castling right
Gerd may know the reason for not publishing, maybe it is because the first 20 single moves are identical in the twins (2018-12-6)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-26
Last update: Gerd Wilts, 2004-8-11 more...
71 - P0006091
Jean-Michel Trillon
Themes-64 1969
P0006091
(7+3)
Der letzte Zug muß zurückgenommen werden. Wer gewinnt?
b) wBc5 nach e5
a) R: 1. exd6ep, dann 1. bxa4,+-
b) R: 1. cxd6ep, dann 1. c6 Lxc6#
play all play one stop play next play all
In a) hat der zurückgenommene wBe5 keinen legalen Zug, daher kann Weiß beliebig ziehen und mit bxa4 gewinnen.
In b) kann der zurückgenommene wBc5 ziehen und muß dies auch tun (BG-Regel).
AV: b) Bc5 nach e5 (nicht e4).
Les Blancs ont touché le pion c5 et doivent le jouer ! (2005-6-23)
VL: Both kings in check. It seems to be the first
published BG-problem (cf. P0004893). (2005-7-21)
A.Buchanan: Not clear when the earliest BG problem was published. P1340386 might be the earliest at 1873, but P1354447 could have been earlier, and at the latest 1885. (2018-10-7)
comment
Keywords: Touch Move, Joke, En passant in the retro play, Illegal position, Retract illegal move
Genre: Retro, Studies
Reprints: (4) diagrammes 97 04-06/1991
Chess Life Online 20/05/2011
Input: Gerd Wilts, 1995-7-16
Last update: A.Buchanan, 2018-10-6 more...
72 - P0006245
Peter Wong
2024 Phénix 31 07/1995
1. Preis
P0006245
(12+15)
BP in 27,5
1. Sf3 a6 2. Sd4 Ta7! 3. Sb5 axb5 4. f3! Ta3 5. bxa3 Sc6 6. Lb2 Sa5 7. Le5 Sc4 8. Ld6 cxd6 9. c3 Da5 10. Dc2 Da4 11. Dg6 Dc2 12. Dh6 gxh6 13. f4 Lg7 14. f5 Ld4 15. f6 Sxf6 16. h3! Tg8 17. h4 Tg3 18. h5 Th3 19. g3! La7 20. Lg2 b6 21. La8 Lb7 22. 0-0 Lg2 23. Lf3 Se4 24. g4 f6 25. g5 Kf7 26. g6 Ke6 27. g7 Kd5 28. g8=S
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (2 min.) (2018-12-9)
more ...
comment
Keywords: Bahnung, Räumung, Unique Proof Game, Castling, Loss of tempo (t1), Promotion
Genre: Retro
Reprints: 3402 U.S. Problem Bulletin 102/103 07-10/1995
H17 FIDE Album Annexe 1995-1997 2004
(66) Parallel Strategy 2004
Input: Gerd Wilts, 1995-8-17
Last update: Alfred Pfeiffer, 2014-3-26 more...
73 - P0006428
Andrey Frolkin
9133v Die Schwalbe 157, p. 283, 02/1996
P0006428
(13+12)
BP in 20,0
May White castle?
Weiß darf noch rochieren: 1. h4 Sa6 2. h5 Sc5 3. h6 a6 4. hxg7 h5 5. f4 h4 6. f5 h3 7. f6 h2 8. fxe7 Sf6 9. g8=L Lh6 10. Lxf7 Kxf7 11. e8=T Kg6 12. Te6 Dg8 13. Tc6 Db3 14. axb3 dxc6 15. Ta4 Lh3 16. Te4 Tag8 17. Te8 hxg1=D 18. e4 Dd4 19. Lc4 Tg7 20. Lg8 Dd8
Ohne die Bedingung, daß Weiß rochieren darf, gibt es andere BPs: 1. f4 Sa6 2. f5 Sc5 3. f6 a6 4. fxe7 f5 5. e4 f4 6. Lb5 f3 7. Lc6 f2+ 8. Ke2 fxg1=D 9. h4 dxc6 10. h5 Lf5 11. h6 Sf6 12. hxg7 Dd5 13. g8=L Db3 14. Lxh7 Kf7 15. axb3 Lh6 16. Ta4 Tag8 17. Td4 Dxd4 18. e8=T Tg7 19. Lg8+ Kg6 20. Ke1 Dd8
play all play one stop play next play all
SH: Cooked?:
1. e4 f5 2. Ne2 f4 3. h4 f3 4. h5 fxe2 5. f4 exf1B 6. f5 Bc4 7. f6 Bb3 8. axb3 Na6 9. fxe7 Nc5 10. Ra6 Nf6 11. Rc6 dxc6 12. h6 Bh3 13. hxg7 Qd7 14. g8B Bh6 15. Bxh7 Kf7 16. Qf3 Rag8 17. Qe2 Rg7 18. Bg8+ Kg6 19. Qd1 a6 20. e8R Qd8 (2005-6-20)
Henrik Juel: The stipulation question was probably intended as an implicit condition; when answered affirmatively, there should be a unique solution
But SH's solution shows that the problem is cooked (2018-12-9)
comment
Keywords: Anti-Pronkin Theme, Conditional problem, Unique Proof Game, Castling in the forward play
Genre: Retro
Input: Gerd Wilts, 1996-6-12
Last update: Gerd Wilts, 2004-8-11 more...
74 - P0006438
Andrey Frolkin
9191 Die Schwalbe 158, p. 343, 04/1996
Werner Keym gewidmet
2. ehrende Erwähnung Abt. II
P0006438
(15+15)
KBP?
UWF sind in der Diagrammstellung 1) zulässig, 2) nicht zulässig
1) 1. h4 h5 2. Th3 Th6 3. Te3 Tc6 4. Te6 dxe6 5. a4 Dd5 6. a5 Kd7 7. a6 Kd6 8. axb7 a5 9. Sh3 Sa6 10. b8=T a4 11. Tb7 Tb8 12. Ta7 Lb7
2) 1. a4 h5 2. a5 Th6 3. a6 Tc6 4. axb7 a5 5. h4 Sa6 6. b8=D a4 7. Db3 Tb8 8. De6 dxe6 9. Th3 Dd5 10. Tb3 Kd7 11. Tb7 Kd6 12. Ta7 Lb7 13. Sh3
play all play one stop play next play all
Henrik Juel: Part 1) is C+ by Natch 3.1 (2018-12-9)
comment
Keywords: Ceriani-Frolkin Theme (D), Unique Proof Game, Promotion
Genre: Retro
Input: Gerd Wilts, 1996-6-12
Last update: Gerd Wilts, 2006-11-2 more...
75 - P0006474
Mario Velucchi
4103 Problemkiste 105, p. 248, 06/1996
A. Frolkin und A. Kisljak gewidmet
P0006474
(16+16) C+
BP in 11,0
1. d4 e6 2. Dd2 De7 3. Dh6 Da3 4. Lg5 Ld6 5. Sd2 Se7 6. 0-0-0 0-0 7. Kb1 Td8 8. b4 Kf8 9. b5 Ke8 10. b6 g6 11. Dg7 Db2+
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A.Buchanan: What's this about? (2018-10-13)
comment
Keywords: Unique Proof Game, Castling, Capture-free
Genre: Retro
Input: Gerd Wilts, 1996-6-16
Last update: A.Buchanan, 2014-5-23 more...
76 - P0006550
Juraj Lörinc
F1489R The Problemist 09/1994
P0006550
(16+14) C+
Patrol Chess
a) BP in 13,5 or 14,0?
b) #1 (who)?
a) 1. d3 e5 2. Kd2 Le7 3. Ke3 Lh4 4. Kf4 Sf6 5. Kg5 g6 6. Kh6 0-0 7. Lg5 Te8 8. e3 Te7 9. Df3 Se8 10. Kxh7 d6 11. Kh8 Kh7 12. Dxf7 Lf5 13. f4 Te6 14. De7+ Sg7

8. ... Te7 cannot be escaped, so that no proof game ends with White's 14th

b) White mates with 1. Dxg7# (not 1. ... Dg8)
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Castling, Patrol Chess
Genre: Retro, Fairies
Computer test: Jacobi
Input: Gerd Wilts, 1996-6-16
Last update: Alfred Pfeiffer, 2018-8-16 more...
77 - P0006626
Andrey Frolkin
(56v) Die Schwalbe 159, p. 362, 06/1996
1. ehrende Erwähnung Ceriani-Gedenkturnier, 1. Abteilung
P0006626
(13+12)
BP in 20,0
(21. 0-0 is possible)
1. h4 Sa6 2. h5 Sc5 3. h6 a6 4. hxg7 h5 5. f4 h4 6. f5 h3 7. f6 h2 8. fxe7 Sf6 9. g8=L Lg7 10. Lxf7 Kxf7 11. e8=T Kg6 12. Te6 Dg8 13. Tc6 Db3 14. axb3 dxc6 15. Ta4 Lg4 16. Te4 Taf8 17. Te8 hxg1=D 18. e4 Dd4 19. Lc4 Dd8 20. Lg8 Tf7
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Henrik Juel: Seems to be cooked by
1. e4 f5 2. Ne2 f4 3. h4 f3 4. h5 fxe2 5. f4 exf1=B 6. f5 Bc4 7. f6 Bb3 8. axb3 Na6 9. fxe7 Nc5 10. Ra6 Nf6 11. Rc6 dxc6 12. h6 Bh3 13. hxg7 Qd7 14. g8=B Bg7 15. Bxh7 Kf7 16. Qf3 Raf8 17. Bg8+ Kg6 18. Qe2 Rf7 19. Qd1 a6 20. e8R Qd8 (2018-12-9)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Input: Gerd Wilts, 1996-7-11
Last update: Gerd Wilts, 2004-8-11 more...
78 - P0006741
Peter Kniest
386v Caissas fröhliche Tiefgarage 30/08/1971
P0006741
(4+3) cooked
Schwarz nimmt 1 Zug zurück, dann h#3
2 Lösungen
1) R: Ka2xTb1, dann 1. Ka3 Tc1 2. b1=T Kc2 3. Txb4 Txa1#
2) R: a3xSb2, dann 1. Ka2 Kc2 2. Tb1 Sd1 3. Ta1 Sc3#
play all play one stop play next play all
Cook: R: 1. c3xSb2, dann 1. c2 Ke1,Ke2 2. Kc1 b6 3. Tb1 Sd3#
R: 1. Ka2xDb1, dann 1. Kb3 Dc1 2. Ka3 Kc2 3. b1=S,Ka2 Db2,Dxb2#
Adrian Storisteanu: Is the diagram correct? Solution 1) doesn't work (+1...Sd2+?? is selfcheck), and there seem to be cooks (e.g., - 1.c3xSb2 & 1.c2+ Ke1 2.Kc1 b6 3.Rb1 Sb2-d3#)... (2015-8-5)
Adrian Storisteanu: The intended solutions (from referenced f-6 11/1971, the diagram being correct):
- 1.Ka2xRb1 & 1.Ka3 Rc1 2.b1R Kc2 3.Rxb4 Rxa1#,
- 1.a3xSb2 & 1.Ka2+ Kc2 2.Rb1 Sd1 3.Ra1 Sc3#. (2018-10-25)
comment
Keywords: Help retractor
Genre: Retro
Reprints: (bf) feenschach 6 11/1971
Input: Gerd Wilts, 1996-7-24
Last update: Mario Richter, 2018-10-26 more...
79 - P0007032
Henrik Juel
3000 Probleemblad 05/1996
P0007032
(15+16)
BP in 19,0
1. c3 h5 2. Dc2 Th6 3. Dh7 f5 4. Kd1 Kf7 5. Kc2 Ke6 6. Kd3 Kd5 7. Ke3 Kc4 8. a3 Kb3 9. Sh3 Kc2 10. Sf4 Kd1 11. h3 Ke1 12. Th2 Kxf1 13. Kf3 Ke1 14. Kg3 Kd1 15. Th1+ Kc2 16. Kh2 Td6 17. Kg1 Td5 18. Kf1 d6 19. Ke1 Le6
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Henrik Juel: C+ by Jacobi using the constraints
Ke8-c2-d1-e1xf1-e1-d1-c2 Ke1-d1-c2-d3-g3-h2-g1-f1-e1
which are valid, because [Ke8] is the only black man who could capture [Lf1] in time, so [Ke1] would have to get out via c2-d3 and back home via g3-h2
It is recommended that HC+ is used, but this is not available on the PDB (yet)
Ke1 made a round trip (which is stronger than a promenade) (2018-12-9)
comment
Keywords: Unique Proof Game, Promenade (Kk)
Genre: Retro
Reprints: Ex2 64 Proof Games 2012
Input: Gerd Wilts, 1996-8-12
Last update: Gerd Wilts, 2012-12-28 more...
80 - P0007490
Andrey Frolkin
Alexander V. Shvichenko

6856 feenschach 116 10/1995
P0007490
(12+16) cooked
BP in 8,5
Andernachschach
1. d4 e5 2. d5 Dg5 3. Dd4 Kd8 4. Dxe5[=sD] De8 5. d6 Le7 6. dxe7[=sB] d6 7. g3 Lh3 8. Lxh3[=sL] Lc8 9. Lxg5[=sL]
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Cook: NL
1. d4 e6 2. g3 De7 3. Lh3 Kd8 4. Lxe6=sL De8 5. d5 Le7 6. d6 Ld5 7. Dxd5=sD Dg5 8. dxe7=sB d6 9. Lxg5=sL (paul)
more ...
comment
Keywords: Andernach Chess, Unique Proof Game
Genre: Retro, Fairies
Input: Gerd Wilts, 1996-8-31
Last update: Alfred Pfeiffer, 2018-8-10 more...
81 - P0008429
Peter Wong
U.S. Problem Bulletin 102/103 07-10/1995
P0008429
(12+14)
BP in 22,5
1. Sf3 a6 2. Sd4 Ta7 3. Sb5 axb5 4. h3 Ta3 5. bxa3 Sa6 6. Lb2 Sc5 7. Lf6 gxf6 8. c3 Lh6 9. Db3 Lg5 10. De6 dxe6 11. h4 Dd3 12. hxg5 Dc2 13. g6 hxg6 14. f3 Th3 15. f4 Td3 16. g3 Kd7 17. Lh3 Kc6 18. Lg2+ Kb6 19. Lc6 Se4 20. Le8 Ld7 21. 0-0 Lc6 22. Ld7 Ld5 23. Lc8
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (12 sec.) (2018-12-10)
comment
Keywords: Unique Proof Game, Castling, Loss of tempo (tBL)
Genre: Retro
Input: Gerd Wilts, 1996-9-18
Last update: Mario Richter, 2009-11-15 more...
82 - P0008445
Mario Velucchi
3570 diagrammes 118 07/1996
Ph. Schnoebelen gewidmet
P0008445
(5+9)
h#3
1. bxa4 axb3 2. Kxb3 Kd2 3. Kb4 Tb1#
play all play one stop play next play all
A.Buchanan: I like best when all pieces are essential to the chess as well as the letter. Here wfP & beP don't seem to add much. (2018-10-13)
more ...
comment
Keywords: Cant Castler, Castling, Letter problem
Genre: Retro, h#
Input: Gerd Wilts, 1996-10-3
Last update: A.Buchanan, 2018-10-13 more...
83 - P0008570
Unto Heinonen
Suomen Tehtäväniekat 06/1995
P0008570
(13+14)
BP in 24,0
1. e4 Sc6 2. Dh5 Se5 3. Le2 Sg6 4. Ld1 f5 5. Se2 f4 6. 0-0 f3 7. Kh1 fxe2 8. f4 e1=L 9. Tf3 Lh4 10. Td3 Lf6 11. Td6 Lc3 12. bxc3 exd6 13. La3 Le7 14. Lc5 Lf6 15. Lf2 Ld4 16. cxd4 S8e7 17. Sc3 Sc6 18. Tb1 Sb8 19. Tb6 axb6 20. Lh4 Ta5 21. Le7 Tg5 22. Lf8 Tg3 23. Da5 Se7 24. Da8 Sg8
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Henrik Juel: C+ by Natch 3.1 (2 min.)
After 2.Dh5 [Pf7] is pinned; to unpin it quickly Black must play Sb8-c6-e5-g6, so when [Pf7] moves, the sSg6 is pinned; later Black has nothing better to do than playing Sg8-e7-c6-b8, and the sSS interchange is halfway there
The long march Lc1-a3-c5-f2-h4-e7-e8 is remarkable (2018-12-10)
comment
Keywords: Ceriani-Frolkin Theme (l), Unique Proof Game, Interchange (ss), Castling
Genre: Retro
Reprints: Thema Danicum 100 2000
Input: Gerd Wilts, 1997-1-9
Last update: Gerd Wilts, 2006-1-12 more...
84 - P0008654
Ronald Turnbull
12857 British Chess Magazine 1993
Lob
P0008654
(15+14)
BP in exactly 11,5
1. g4 e6 2. g5 Ke7 3. g6 Kf6 4. gxh7 Kg6 5. hxg8=S Th3 6. Se7+ Kh7 7. Sc6 dxc6 8. Lg2 Sd7 9. Ld5 Sf6 10. Lf3 Dd5 11. Lg2 Ld7 12. Lf1
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Henrik Juel: C+ by Natch 3.1 (1 sec.) (2018-12-10)
A.Buchanan: I imagine that e.g. 12. ... Tc8 would allow the removal of the "exactly" limitation, which is unsavory in a tempo problem. (2018-12-12)
more ...
comment
Keywords: Ceriani-Frolkin Theme (S), Unique Proof Game, Homebase (W), Loss of tempo (L)
Genre: Retro
Input: Gerd Wilts, 1997-5-19
Last update: A.Buchanan, 2013-1-18 more...
85 - P0008658
Thierry Le Gleuher
1550v Phénix 50 03/1997
P0008658
(14+14)
BP in 19,0
1. h4 g5 2. hxg5 f5 3. Th6 f4 4. Tc6 f3 5. exf3 bxc6 6. Lc4 La6 7. d3 Lb5 8. Kd2 La4 9. Kc3 Lb3 10. a4 La2 11. Kb4 Lxb1 12. c3 Lc2 13. De1 Ld1 14. Lf4 Le2 15. Lh2 Lf1 16. g3 Lh3 17. Td1 Le6 18. Td2 Ld5 19. Da1 c5+
play all play one stop play next play all
paul: Correction of P0002202 (2014-7-4)
Henrik Juel: C+ by Natch 3.1 (17 min.) (2018-12-10)
comment
Keywords: Unique Proof Game, Promenade (l)
Genre: Retro
Input: Gerd Wilts, 1997-5-20
Last update: Gerd Wilts, 2006-1-12 more...
86 - P0008883
Unto Heinonen
1350 Suomen Tehtäväniekat 03-04/1997
P0008883
(13+13)
BP in 29,5
1. h4 c6 2. Th3 Db6 3. Tc3 De3 4. fxe3 Sa6 5. Kf2 Sc5 6. Kf3 Sb3 7. Ke4 Sxa1 8. Kd4 a5 9. Kc5 Sb3+ 10. Kb6 Sc5 11. Sf3 Sa6 12. Sd4 Sb8 13. Kc7 b6 14. Sb5 La6 15. Sa7 Lc4 16. g4 Lb3 17. cxb3 e5 18. Dc2 Ke7 19. Dxh7 Kf6 20. Dc2 Th5 21. Kd8 Tf5 22. h5 Kg5 23. h6 Kh4 24. h7 Kg3 25. h8=T Kf2 26. Th4 Th5 27. g5 Ke1 28. Tb4 axb4 29. Ke8 bxc3
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Joost de Heer: [Event "Edited game"]
[Site "COCOS10"]
SOlution: 1. h4 c6 2. Rh3 Qb6 3. Rc3 Qe3 4. fxe3 Na6 5. Kf2 Nc5 6. Kf3 Nb3 7. Ke4
Nxa1 8. Kd4 a5 9. Kc5 Nb3+ 10. Kb6 Nc5 11. Nf3 Na6 12. Nd4 Nb8 13. Kc7 b6
14. Nb5 Ba6 15. Na7 Bc4 16. g4 Bb3 17. cxb3 e5 18. Qc2 Ke7 19. Qxh7 Kf6 20.
Qc2 Rh5 21. Kd8 Rf5 22. h5 Kg5 23. h6 Kh4 24. h7 Kg3 25. h8=R Kf2 26. Rh4
Rh5 27. g5 Ke1 28. Rb4 axb4 29. Ke8 bxc3 (2001-11-5)
Henrik Juel: typo: 30. Dd1 is missing (2018-12-10)
Henrik Juel: should be Dd1+ (2018-12-10)
Henrik Juel: In an hour Natch 3.1 could not even find the intended solution (2018-12-10)
A.Buchanan: how about "demolition mode" in Jacobi? (2018-12-12)
comment
Keywords: Ceriani-Frolkin Theme (T), Unique Proof Game, Interchange
Genre: Retro
Input: Gerd Wilts, 1998-6-26
Last update: Gerd Wilts, 2005-12-29 more...
87 - P0008919
Gianni Donati
R012 Probleemblad 11/1997
5. Preis
P0008919
(14+14)
BP in 17,0
1. Sf3 h5 2. Se5 Sh6 3. Sxd7 Kxd7 4. g4 Kc6 5. Lg2+ Kb5 6. Le4 Lxg4 7. Lh7 g6 8. Kf1 Lg7 9. Kg1 Ld4 10. Df1 Lb6 11. Dg2 c5 12. Dxb7 Dc7 13. Dg2 Td8 14. Df1 Td5 15. Dd1 Sd7 16. Kf1 Tc8 17. Ke1 Db8
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (5 min.) (2018-12-10)
comment
Keywords: Unique Proof Game
Genre: Retro
Reprints: feenschach 137 08-09/2000
Input: Gerd Wilts, 1998-6-26
Last update: Gerd Wilts, 2006-1-12 more...
88 - P0008957
Gianni Donati
2700 Phénix 58 12/1997
P0008957
(15+15)
BP in 22,5
1. g4 d6 2. Lh3 Dd7 3. Kf1 De6 4. De1 De3 5. fxe3 Kd7 6. Dh4 Kc6 7. Dh6 gxh6 8. Sf3 Lg7 9. Tg1 Ld4 10. Tg3 Sf6 11. Lg2 Tg8 12. Th3 Tg5 13. Th5 Te5 14. Tg5 Lf5 15. Tg8 Sbd7 16. Th8 Tg8 17. Ke1 Tg5 18. Ta8 Th5 19. g5 Sg8 20. g6 Tg5 21. Lf1 Tg1 22. g7 Th1 23. Sg1
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Henrik Juel: This is one of the proof games that is solved faster by hand than by computer
The two captures are obvious, and the interchanged rooks make a guess like Th1-g1-g3-h3-h5-g5-g8-h8-a8 reasonable
Natch 3.1 got nowhere in an hour (2018-12-10)
comment
Keywords: Unique Proof Game
Genre: Retro
Input: Gerd Wilts, 1998-6-26
Last update: Gerd Wilts, 2005-12-30 more...
89 - P0009124
Michel Caillaud
2952 Phénix 69 12/1998
P0009124
(14+13)
BP in 18,0
1. e3 b5 2. Lc4 b4 3. d3 b3 4. Sd2 bxa2 5. b4 g6 6. Lb2 Lg7 7. Dc1 Le5 8. Lxe5 d6 9. Da3 Sd7 10. 0-0-0 a1=L 11. Le6 Lc3 12. Sc4 Le1 13. f3 Lg3 14. h4 Lf4 15. h5 Lh6 16. hxg6 Lf8 17. g7 d5 18. gxf8=S dxc4
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Schlag des Original-sLf8 auf e5 durch eine Figur, anschließend Schlag des Pronkin-Lf8.
Henrik Juel: C+ by Natch 3.1 (15 min.)
You can count the white moves, but Black has to work hard to get rid of his [Pb7]; surprisingly it makes 11 moves to promote to L and reach f8 (2018-12-10)
comment
Keywords: Ceriani-Frolkin Theme (l), Unique Proof Game, Promenade (l), Pronkin Theme (l)
Genre: Retro
Input: Gerd Wilts, 1999-2-27
Last update: A.Buchanan, 2014-5-22 more...
90 - P0009125
Mikhailo Kozulya
2953 Phénix 69 12/1998
P0009125
(14+13)
BP in 26,0
2 Lösungen
1. a4 d5 2. a5 d4 3. a6 d3 4. axb7 dxe2 5. Ta6 exd1=L 6. Tc6 a5 7. h4 a4 8. h5 a3 9. h6 a2 10. hxg7 Ta3 11. Thh6 Sa6 12. Thf6 h5 13. b8=L h4 14. La7 h3 15. Le3 h2 16. Lg5 Thh3 17. f4 Sh6 18. g8=L Ldg4 19. Lh7 Lgd7 20. Lhd3 e6 21. Lb5 Lb4 22. c4 Lc3 23. dxc3 Ke7 24. Sd2 Dh8 25. Sdf3 Le8 26. Sh4 Lcd7
1. h4 d5 2. h5 d4 3. h6 d3 4. hxg7 dxe2 5. Th6 exd1=L 6. Tf6 h5 7. a4 h4 8. a5 h3 9. a6 h2 10. axb7 Th3 11. Taa6 Sh6 12. Tac6 a5 13. g8=L a4 14. Lh7 a3 15. Lhd3 a2 16. Lb5 Taa3 17. c4 Sa6 18. b8=L Ldg4 19. La7 Lgd7 20. Le3 e6 21. Lg5 Lb4 22. f4 Lc3 23. dxc3 Ke7 24. Sd2 Dh8 25. Sdf3 Le8 26. Sh4 Lcd7
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Henrik Juel: C+ by Natch 3.1 (10 sec.)
The last 4.5 moves are identical in the two solutions (2018-12-10)
comment
Keywords: Unique Proof Game
Genre: Retro
Input: Gerd Wilts, 1999-2-27
Last update: Gerd Wilts, 2002-10-6 more...
91 - P0009136
Michel Caillaud
R025 Probleemblad 07/1998
3. Preis
P0009136
(13+15)
BP in 19,0
1. c4 g6 2. c5 Lh6 3. c6 Le3 4. dxe3 f5 5. Dd6 cxd6 6. Ld2 Db6 7. La5 Dd4 8. Ld8 b6 9. c7 Lb7 10. c8=D f4 11. Dc6 f3 12. Lc7 fxg2 13. Df3 d5 14. Ld6 Sh6 15. La3 Tf8 16. b4 Txf3 17. Lc1 Th3 18. f4 Sf7 19. Kf2 h5
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Um den wBc2 los zu werden, muß Weiß ihn auf c8 in eine D umwandeln und auf f3 vom sTh8 schlagen lassen. Um die Umwandlung möglich zu machen, muss der wLc1 auf d8 Schachschutz geben.
Henrik Juel: Natch 3.1 did nothing during a couple of hours (2018-12-10)
comment
Keywords: Ceriani-Frolkin Theme (D), Unique Proof Game, Round Trip (L), Check Protection
Genre: Retro
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 1999-2-27
Last update: A.Buchanan, 2014-5-22 more...
92 - P0009149
Andrey Frolkin
R036 Probleemblad 11-12/1998
P0009149
(14+13)
BP in 26,0
1. h4 d5 2. h5 d4 3. h6 d3 4. hxg7 dxc2 5. d4 f5 6. Ld2 c1=L 7. Da4+ Kf7 8. Dxa7 e5 9. La5 Lh6 10. Sa3 f4 11. 0-0-0 e4 12. Kc2 e3 13. Kb3 exf2 14. Sc2 La3 15. Ka4 Se7 16. b4 Te8 17. g8=T Lf8 18. Th6 Lh3 19. gxh3 Lc1 20. Lg2 f1=L 21. Lc6 Dd5 22. Lb5 Sbc6 23. h4 Tad8 24. Sh3 Td6 25. Sf2 Lh3 26. a3 Lc8
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paul: Here, we have also an interchange between Bc1 and Bf8. (2018-3-21)
Henrik Juel: The months should be 11-12, not 09 (2018-3-21)
Mario Richter: @Henrik: Is my guess correct that "9" might be the issue number? (i.e. issue 9 of 1998 was for the months Nov.+Dec.?) (2018-3-21)
Henrik Juel: No, Mario; I think the error might have occurred, because Andrej also had a proof game in the preceding issue
Back then PB had six issues per year, numbered 1-6 for each year (unlike Die Schwalbe), so the issue number contains little information
This problem appeared in issue 6, Nov-Dec 1998 (2018-3-21)
Henrik Juel: Natch 3.1 did not even find the solution in an hour (2018-12-10)
comment
Keywords: Unique Proof Game, Pronkin Theme (l)
Genre: Retro
Input: Gerd Wilts, 1999-2-27
Last update: Mario Richter, 2018-3-21 more...
93 - P0009151
Gianni Donati
R038 Probleemblad 09/1998
Michel Caillaud gewidmet
1. Lob
P0009151
(14+15)
BP in 22,0
1. h4 Sf6 2. h5 Sd5 3. h6 gxh6 4. Sf3 Lg7 5. Tg1 Lc3 6. Se5 Kf8 7. f3 Kg7 8. Kf2 Dg8 9. Kg3 Kf8+ 10. Kh4 Dg6 11. d4 Db6 12. Kh5 Db3 13. axb3 Ke8 14. Ta6 Kd8 15. Tf6 exf6 16. Sa3 Se7 17. d5 Te8 18. Dd4 Sg8 19. Da4 Lb4 20. c4 Lf8 21. Sc2 Te7 22. Se1 Ke8
play all play one stop play next play all
Henrik Juel: Natch 3.1 did little in an hour and a half (2018-12-10)
comment
Keywords: Unique Proof Game, Round Trip (k), Pure Round Trip (sl)
Genre: Retro
Input: Gerd Wilts, 1999-2-27
Last update: Gerd Wilts, 2006-1-12 more...
94 - P0009156
Satoshi Hashimoto
PR09 Problem Paradise 10 07-09/1998
2. Preis
P0009156
(14+14)
BP in 21,5
1. h4 g5 2. Th3 Lg7 3. Td3 Le5 4. Td6 cxd6 5. Sc3 Da5 6. Se4 Da3 7. bxa3 a5 8. Lb2 Ta6 9. Ld4 Tc6 10. Le3 Tc3 11. dxc3 b6 12. Dd5 Lb7 13. De6 fxe6 14. 0-0-0 Kf7 15. Kb2 Kg6 16. Lc1 Kf5 17. Sd2 Kf4 18. g4 Lg2 19. Sgf3 Lh3 20. Lg2 Sf6 21. Th1 Tf8 22. Sb1
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (8 min.) (2018-12-10)
comment
Keywords: Unique Proof Game, Pure Round Trip (SL)
Genre: Retro
Reprints: feenschach 153 10-12/2003
3 64 Proof Games 2012
Input: Gerd Wilts, 1999-2-27
Last update: Gerd Wilts, 2012-12-23 more...
95 - P0009163
Hitoshi Yanami
H16c Problem Paradise 11 10-12/1998
P0009163
(15+15)
BP in 20,0
1. g3 Sa6 2. Lg2 Tb8 3. Lc6+ bxc6 4. Sf3 Tb3 5. 0-0 Te3 6. dxe3 d5 7. Dd4 Lf5 8. Td1 e6 9. Td3 Dg5 10. Df6 d4 11. Ta3 d3 12. Se5 d2 13. f3 d1=T+ 14. Kf2 Td4 15. b3 Ta4 16. Lb2 Lb4 17. Ld4 Se7 18. Sc3 Kd8 19. Th1 Kc8 20. Ke1 Td8
play all play one stop play next play all
Weiß hat rochiert, wTh1 ist von a1. Schwarz hat nicht rochiert, sTd8 ist von h8.
Henrik Juel: C+ by Natch 3.1 (2 min.) (2018-12-10)
comment
Keywords: Unique Proof Game, Castling Paradox (wk hidden sd fake)
Genre: Retro
Input: Gerd Wilts, 1999-2-27
Last update: A.Buchanan, 2013-5-1 more...
96 - P0500984
Herbert Grasemann
Deutsche Schachblätter 1950
Dem deutschen Schachmeister, -schriftsteller und Problemfreund Kurt Richter zum 50. Geburtstag gewidmet
2. Preis
P0500984
(4+8)
#6
1. Dh3+ Ke2 2. Df1+ Kxf1 3. Lh3+ Ke2 4. Lf1+ Kxf1 5. Sf5! Ta2 6. Sg3#
play all play one stop play next play all
ohne den wLf5 ginge sofort 1. Sf5 ... 2. Sg3#
Figuren-Kranz 3×3 d1f3
Erich Bartel: Nachdrucke:
1) Schach-Echo 1955.S.223.---
2) 50 Schach ohne Partner 1977.---
3) 300a Beispiele zur Ideengeschichte des Schachproblems 1982.---
4) feenschach (66) VIII 1983.--
5) 63 logische Phantasien 1986.---
6) 075 Kegelschach 1997.---
7) Die Schwalbe (176) IV 1999,S.64.---
8) Schach VII 1999,S.76.---
9) 1019 Minimalkunst im Schach 2006.---
10) VIII Die Schwalbe (225) VI 2007,S.137.--- (2007-6-18)
Steven Dowd: According to Murkisch, this problem is dedicated "Kurt Richter zum 50. Geburtstag." (2007-6-22)
Sally: 54 Das logische S. Problem.
S. 506 Schwalbe Juni 2008. (2010-4-13)
Sally: S. 26, Nr 23c Schwalben - Treff 90 ( W. E. Kuhn 1990). (2011-12-8)
Sally: Die Aufgabe wurde ferner in "Informal-Ringturnier" der Schwalbe 1950 mit dem 5. Preis ausgezeichnet.
Der Sh4 möchte auf g3 mattsetzen doch wird 1. Sf5?? durch den eigenen Läufer behindert,. Für beliebige Wegzüge des Läufers ist Schwarz zu stark. Dem räumenden Schachgebot :
1. Lh3+?? wiederum steht noch die eigene Dame im Wege. Also hinweg mut ihr, damit der Läufer folgen kann. (2018-9-22)
comment

Genre: n#
Reprints: 206 Volksstimme (Chemnitz) 15/09/1962
Schachsport (LVOOe) 17 03/02/1989
Input: Gerd Wilts, 1996-6-6
Last update: Mario Richter, 2016-9-19 more...
97 - P0501285
Jan Hartong
Demetrio Gussopulo

11393 feenschach 06/1978
P0501285
(3+5) C+
h#3
1. Tf3 Th5 2. Kf4 Lh3 3. Te3 Tf5#
play all play one stop play next play all
Alfred Pfeiffer: Aufgabe nicht gefunden. Eine Quelle "11393 feenschach 06/1978" gibt es nicht. (2018-12-3)
comment
Keywords: Interchange (TLkt)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: hpr, 1996-6-14
Last update: Alfred Pfeiffer, 2018-12-3 more...
98 - P0502176
John Niemann
789 Schachmatt 60 25/12/1947
P0502176
(3+3)
h#4
Wieviele Lösungen?

275 Lösungen (genaue Angaben siehe Blatt 89, 27. VI.1948) .
Popeye findet 277 Lösungen: klären
Anton Baumann: Alybadix und Gustav 4.0e finden ebenfalls 277 Lösungen:
1.Sh3: 20 1.Se4: 94 1.Sf7: 76 1.Sh7: 87 total = 277 (2018-11-24)
comment

Genre: h#
Input: hpr, 1996-7-23
Last update: Alfred Pfeiffer, 2018-11-24 more...
99 - P0502925
György Paros
Magyar Sakkvilag 1945
1.-2. Preis
Ungarische Problemmeisterschaft
P0502925
(4+8) C+
h#3
1. Lg7 h8=S 2. Tf4 Sf7 3. Txf7 Kxb7#
play all play one stop play next play all
Sally: Die ersten beiden w. Züge sind reine Tempozüge; die untätige Figur wird von Schwarz noch geschlagen. die Deckung von f7 ist nur Täuschung. (2018-11-6)
comment
Keywords: Sacrifice of white pieces, under-promotion (S)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 1309 FIDE Album 1945-1955 1964
Input: hpr, 1996-8-29
Last update: Alfred Pfeiffer, 2018-11-6 more...
100 - P0503669
Yuri Bilokin
Alexandr P. Dmitrenko

4824v Mat (Belgrad) 03-04/1986
P0503669
(2+12) cooked
h#6
1. Lc5 La6 2. b5 Lxc8 3. La7 Lxe6 4. Sd7 Lc4 5. 0-0-0 Lxb5 6. Lb8 La6#
play all play one stop play next play all
Cook: NL 1. Kd7 Lxh3 2. Kc6 Kg2 3. Te5 Kf3 4. Tb5 Ke4 5. Ld7 Lg2 6. Lc5 Ke5#
vgl. Castro, P. 1964 (P0503675)
Adrian Storisteanu: Possible fix: +bPf3 (2+13). (2015-8-9)
Yuri Bilokin: https://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1294368%27&s=0 (2018-10-31)
Henrik Juel: Yuri, you do not have to write the long search string
P1294368 suffices (2018-10-31)
more ...
comment
Keywords: Castling, Pure Round Trip (L)
Genre: h#
Input: hpr, 1996-9-23
Last update: Alfred Pfeiffer, 2015-11-4 more...
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