1428 problem(s) found in 1328 milliseconds (displaying 100 problem(s)).

1 - P0000067
Karlheinz Bachmann
5821 Die Schwalbe 104 04/1987
P0000067
(11+15) cooked
BP in 48,0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Sd5 9. Th1 Sb6 10. Tg1 Sa8 11. Th1 b6 12. Tg1 La6 13. Th1 Dc8 14. Tg1 Db7 15. Th1 Df3 16. gxf3 h5 17. Lh3 h4 18. Le6 h3 19. La2 Lc4 20. Lb1 La2 21. b3 Sa6 22. Lb2 Sc5 23. Lf6 gxf6 24. Kf1 Lh6 25. Kg1 Lf4 26. Df1 Sh6 27. Dg2 hxg2 28. h4 0-0 29. Th3 Kh7 30. Tg3 Sg8 31. Kh2 g1=S 32. Kg2 Kh6 33. Tg4 Lh2 34. Tb4 Kh5 35. f4 Sf3 36. Tb5 Sd4 37. Ta5 Sb5 38. Kf3 Lg1 39. Ke3 Kg4 40. Ta7 Kh3 41. Tb7 Kg2 42. Tb8 Kf1 43. Kf3 Ke1 44. Kg2 Kd1 45. Kf1 Kc1 46. Ke1 Kb2 47. Kd1 Ka1 48. Kc1 Ta6
play all play one stop play next play all
Cook: 1. a3 b5 2. Ta2 b4 3. h4 b3 4. Th3 bxa2 5. Tb3 axb1=S 6. Tb4 Sa6 7. Sf3 Sc5 8. Se5 La6 9. Tb5 Dc8 10. Tb6 Db7 11. Tb4 Df3 12. gxf3 h5 13. Lh3 Th6 14. Le6 Sc3 15. La2 Lc4 16. Lb1 La2 17. b3 S3a4 18. Sg4 hxg4 19. Lb2 g3 20. Tb7 Ta6 21. Lf6 gxf6 22. Dc1 Lh6 23. Db2 Kf8 24. Dc3 Kg7 25. Db4 Tf8 26. Db5 Sb6 27. Dc6 Sa8 28. Dd6 g2 29. De6 g1=S 30. Dd6 Lf4 31. Dc6 Lh2 32. f4 Sf3+ 33. Kf1 Sd4 34. Kg2 Sb5 35. Kf3 Kh6 36. Ke3 Kh5 37. Dd6 Kg4 38. Dc6 Kh3 39. Dd6 Kg2 40. Db6 Kf1 41. Kf3 Ke1 42. Kg2 Kd1 43. Kf1 Kc1 44. Ke1 Kb2 45. Kd1 Ka1 46. Kc1 axb6 47. Tb8 Lg1
paul: See P0002277 as a correction. (2018-3-3)
more ...
comment
Keywords: Unique Proof Game, Length Record, Non-standard material, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-3-3 more...
2 - P0000138
Wolfgang Dittmann
6633v Die Schwalbe 117 06/1989
P0000138
(15+14)
BP in 14,5
Schlagschach
1. Sh3 Sf6 2. Sf4 g5 3. Sd3 e6 4. Tg1 Ke7 5. Sb4 Se8 6. g4 e5 7. h4 gxh4 8. Tg2 h3 9. Tg3 h2 10. d3 h1=L 11. Sd2 Le4 12. dxe4 Lg7 13. Lg2 Kf8 14. Th3 h5 15. gxh5
play all play one stop play next play all
paul: The first 12.5 moves checked by Jacobi, with blackmustcapture and whitemustcapture. (2018-2-27)
A.Buchanan: @Paul: I still don't understand why you don't set kings not royal. You might miss a solution/cook. (2018-2-27)
paul: @Andrew: in the first instance, I wanted to show that the solution also works with orthodox Kings. (2018-2-28)
comment
Keywords: Ceriani-Frolkin Theme (l), Unique Proof Game, Losing Chess, Loss of tempo
Genre: Retro, Fairies
Reprints: (B2) Quartz 35 08/2010
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2015-1-9 more...
3 - P0000676
Werner Keym
2477 Die Schwalbe 51 06/1978
P0000676
(5+5)
Welches war der letzte Zug?
R: 1. Lf8xDg7+
play all play one stop play next play all
Henrik Juel: -1.Lf8xDg7 Dg8 -2.Kd3 Dg7
-3.Lg8 h7 etc. (2004-8-12)
A.Buchanan: I think Willcocks deserved a co-author for P1012630 (2018-4-2)
Henrik Juel: Werner probably thought that saving a man was sufficiently original (2018-4-2)
A.Buchanan: Willcocks would have been young enough to have opined: maybe he just said: "it's yours!" (2018-4-2)
Mario Richter: There are several articles flying around discussing the sense or nonsense of "after" and "version of" labels in the domain of record constructions, maybe in 'Die Schwalbe' or 'feenschach', and I think one even by our problem friend M. Caillaud. IIRC the majoriy was in the "makes no sense-party" ... (2018-4-2)
A.Buchanan: As far as I know, there has never been versioning or after for any economy record construction. I kind of like these problems where there are more composers than pieces on the board, and that would be impractical unless all are equal co-authors. And PDB doesn't support versioning/after properly anyway. (2018-4-2)
comment
Keywords: Type C, Last Move? (LxD), Economy record
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2012-4-15 more...
4 - P0000965
Thomas R. Dawson
(86.) The Fairy Chess Review 7, p. 78, 08/1937
P0000965
(3+8)
Letzter Zug?
R: 1. b6xLa7
play all play one stop play next play all
Henrik Juel: A possible retroplay is
-1.b6xLa7 Lb8 -2.a5xSb6 Sd5xSb6 -3.Sc4,
then extract the kings via b6, etc. (2018-4-2)
comment
Keywords: Type A, Last Move? (BxL), Economy record, Type B (a fortiori)
Genre: Retro
Reprints: A/30 feenschach 159, p. 78, 04-06/2005
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-4-3 more...
5 - P0000972
Vilhelm Röpke
Albrecht Brandis
Hugo August
Thomas R. Dawson
Richard Steinweg
Hugo Rohr
Valerian Onitiu

1) Skakbladet 08/1924
P0000972
(6+1)
Letzter Zug?
R: 1. Kd1xSc1
play all play one stop play next play all
Henrik Juel: This position was actually submitted by V. Røpke only, according to the comment by tournament director Niels Høeg (p.88); the other authors had a black DTL on a1, but Høeg liked this position best, and it is the most well-known from the tourney
V. Røpke was an actuary and the strongest Danish solver for many years, and he never used his first name, so in talk others did not either, but called him Røpke; I was 15 when I met him, so I called him Mr. Røpke... (2018-4-2)
more ...
comment
Keywords: Last Move? (KxS), Type A
Genre: Retro
Reprints: Rund um das Schachbrett 1955
385 Arbeiter-Zeitung (Wien) 05/04/1959
RA17 diagrammes 16 08/1975
A7b Length Records in Last Single Moves? , p. 4, 11/2009
1429 Problemskak 30, p. 20, 04-06/2015
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2015-7-8 more...
6 - P0001243
Aleksey A. Troitzky
Vladimir Korolkov

(1) Problem 41-44 03/1957
1. Preis
P0001243
(9+12)
Ist die Stellung legal?
Die Stellung ist legal:

R: 1. Kf8-e8 2. Kg8-f8 3. Kh7-g8 4. Kg6-h7 5. Kf5-g6 6. Ke5-f5 7. Kd5-e5 8. Kc4-d5 9. Kb3-c4 10. Kc2-b3 11. Kd1-c2 12. Ke1-d1 13. Kf2-e1 14. Kg1-f2 15. Kf2xTg1
play all play one stop play next play all
Henrik Juel: The long march by black king to uncapture [Th1] was shown in 1930 by Niels Høeg, P0001754 (2018-2-23)
Henrik Juel: ...
But there might exist an even earlier problem by Troitzky, who died in 1942, so this problem must be a version by Korolkov (2018-2-23)
Mario Richter: In his article in 'Problem (Zagreb)' Korolkov mentiones, that in the last years of Troitzky's life, when he lived in Leningrad, Korolkov often visited him and they "not only dealed with the construction of endgame studies, but also of retrograde analysis problems."
Someone with better knowledge of the russian language might perhaps provide more details ... (2018-2-24)
Henrik Juel: So this problem may be a joint composition, although it seems strange that it was published 15 years after Troitzky's death (2018-2-24)
A.Buchanan: According to Wikipedia sadly, Troitsky died of starvation in 1942 in the siege of Leningrad. With all the disruption, perhaps not surprising that publication of this problem was delayed. What was the story of Korolkov's life? Did he leave Leningrad before the siege, or did he survive it? (2018-2-24)
VL: Well, Andrew, VK worked (for appr. 50 years) as an electrical engineer at the famous Kirov plant. Afaik, during the WWII he evacuated together with the plant to Ural (to the so-called Tank City near Chelyabinsk). (2018-2-25)
A.Buchanan: Thank you, Valery. That's quite moving. (2018-2-25)
comment
Keywords: Promenade (k), Non-standard material, Promotion (t), Volet Pawn (extended)
Genre: Retro
Reprints: Problem 61-64 07/1959
528 FIDE Album 1956-1958 1961
116 Europe Echecs 67-68 08/1964
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-2-24 more...
7 - P0001360
Max Lange
885 Deutsche Schachzeitung , p. 61, 02/1858
P0001360
(8+5) C+
#3
1. dxc6ep+! Kd5 2. Sf2 droht 3. Sc7#
2. ... bxc6+ 3. Lxc6#
play all play one stop play next play all
Originalforderung: Weiß zieht und soll auf die kürzeste Weise matt setzen. Matt in wieviel Zügen?

See also P0002092.
VL: The very first retro problem...
The author is presumably Max Lange,
as John Beasley (jointly with Hanspeter Suwe)
determined. See his article on the â??en passant keyâ?�
in The Problemist, May 2004 (pp. 391-392) and
Sept 2004 (p. 459). See also Chess Note 4417 (June 2006) in
http://www.chesshistory.com/winter/ . (2008-11-30)
Mario Richter: The list of contents (p.VIII) for the year 1858 explicitely gives Max Lange as the author of this problem. So could we really say, that the author is 'anonym'? (2010-12-9)
Henrik Juel: Only possible last move is c7-c5
C+ by Popeye 4.61 (2017-9-9)
Henrik Juel: A direct link to Chess Note 4417 is
http://www.chesshistory.com/winter/winter23.html#4417._Zukertort_problem_C.N._4042
But is does not provide new information (2017-11-9)
Henrik Juel: Without the ep key, the shortest mate is in 4 moves
unfortunately with many possible keys 1.Le8,Lc8,Sf6,Se5,Lxc5+
e.g., 1.Sf6 exf6 2.Lf5 Kxd5 3.Sc7+ Kd6 4.Lxc5#
or 1.Lxc5+ Kxd7 2.Txe7+ Kd8 3.Sf6 Kc8 4.Te8# (2018-3-1)
comment
Keywords: En passant, En passant as key
Genre: Retro
Computer test: Popeye 4.61
Reprints: Deutsche Schachzeitung , p. 313, 10/1906
53 Retrograde Analysis 1915
234 Europe Echecs 140-141 10/1970
RA1 diagrammes 11 10/1974
(A) feenschach 154 2004
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2017-9-12 more...
8 - P0001506
Michel Caillaud
379 Europe Echecs 265 01/1981
Dr L. Ceriani zum Gedenken
1.-2. Preis e.a.
P0001506
(14+10)
#1 (wer?)
Henrik Juel: With stipulation '#1 (who?)' the solution is: 1... Sg5#, not 1.Re1??, because Black has the move. -1.Sc3 Sf6 ... -5.Sb6 Sa1 -6.Sc8 S=a2 -7.Sb6 a3 -8.Sc8 a4 -9.S=c7 a5 -10.b6xP a6 -11.a5xQ Qb3 -12.a4 Qd1 -13.c2xP d4 -14.g5 e5xS -15.Sb3 Qe1 -16.Sc5 Qd1 -17.Sd3 a7 -18.Se1 e6 -19.Sg2 Qf1 -20.Re1 e7 -21.fRe2 Rf2 etc. To open the cage we need a man on f1; the only possibility is a bQ, uncaptured on b6. But then we also need a man to screen on g2; uncapturing a bS on d3 and retracting it to g2 is too slow, so on d3 we uncapture a bP, which in turn on d4 uncaptures a wS, which screens on g2. A very good and difficult retro. (2003-4-25)
Yoav Ben-Zvi: The side-to-move is determined by the Retro opposition that occurs when the uncaptured WN needs to retract to e1 (on its way to g2) while the uncaptured BQ shuffles between e1 and d1. (2018-4-3)
comment
Keywords: Whose move?, Retro Opposition
Genre: Retro
Reprints: 970 FIDE Album 1980-1982 1988
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-10-22 more...
9 - P0001517
Michel Caillaud
389v Europe Echecs 271 07/1981
Lob
P0001517
(12+9)
h#2
Henrik Juel: Solution: 1.g5 hxg8=QR 2.gxf4 Kd2#, not 2... 0-0-0??.
Only if White had the move would he be entitled to castle: -1... h5 -2.Sf2 h6 -3.Sd3 Kh1 -4... Bg1 -5... Kh2 .. -8... Kh5 -9... Bh2 -10.Sf2 Bg3 -11.h2 Bh4 -12.Sd3 Bf6 etc. (2003-3-31)
Yoav Ben-Zvi: The need for a tempo move (by WK or WR) arises because WN needs to stand on f2 when Black retracts Bg3-h2. I dont think this is Retro opposition because the role of the WN is positive (Retro Shield) rather than negative. (2018-4-3)
Henrik Juel: Now I notice that Ph7 is a so-callet Volet pawn (coming diagonally from c2)
The definition of Retro Opposition in the latest Album (2010-12, p.620) is:
'In a particular phase of the retro-play it can be proved which side is to play, despite there being mobile units on both sides.' (2018-4-3)
Mario Richter: The position can also be easily resolved by an early retraction of f3-f4, in this case wK had to move earlier in the game not because of RO but to let original wRook h1 out ... (2018-4-5)
Yoav Ben-Zvi: The FIDE Album Theme Index tries to save space so the definitions contain only what is deemed to be the essential core of the theme. In some cases, such as the definition for Retro Opposition, this is carried too far and an essential characteristic is left out. To see this note that the definition (given above) does not distinguish Retro Opposition from the Parity Argument theme. Unless Parity is considered to be a particular type of Retro Opposition, the FIDE Album definition must be rejected.
I think that any satisfactory definition of RO will state that a thematic retraction is prevented (not enabled) by certain circumstances. If this is the case then I see no Retro Opposition here. (2018-4-9)
comment
Keywords: Cant Castler, Retro Opposition, Castling (wg), Volet Pawn
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-4-3 more...
10 - P0001524
Michel Caillaud
396 Europe Echecs 261/262 09/1981
1.-2. Preis e.a.
P0001524
(14+11)
Wer ist am Zug?
R: 1. Sa2-c1 h7xSg6 2. Sf8-g6 Lc1-d2 3. Se6-f8 Ld2-c1 4. Sc5-e6 Lc1-d2 5. Sb7xBc5 Ld2-c1 6. Sd6-b7 Lc1-d2 7. Sb5-d6 Ld2-c1 8. Sa3-b5 Lc1-d2 9. Sb1-a3 Kh2-h1 10. Sd2-b1 Kh3-h2 11. Kg1-f1 c6-c5 12. Sf1-d2 Ld2-c1 13. Sh2-f1 Lc1-d2 14. Tf1-e1 c7-c6 15. 0-0 Dg2-f3 16. Tf3-e3 Le3-c1 17. Sc1-a2 Ld4-e3 18. Te3-f3 Lg7-d4 19. f3-f4
play all play one stop play next play all
Weiße Schläge: hxg; gxf; dxe; axb. Schwarze Schläge: hxg; dxc. Schwarzer Bc7 wurde auf seiner Linie geschlagen, sBa7 wandelt sich auf a1 um. Schwarz ist am Zug.
Yoav Ben-Zvi: The side-to-move is determined by 2 Retro oppositions: The BB is prevented from retracting to d2 when the WN stands there on its way to h2 and White un-castling is prevented with BB standing on d2. The 2 tempo moves provided by a BP that is uncaptured on c5 are not enough to overcome both oppositions if the diagram position is White-to-move. (2018-4-3)
comment
Keywords: Retro Opposition, Castling (wk), Whose move?
Genre: Retro
Reprints: 972 FIDE Album 1980-1982 1988
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-4-3 more...
11 - P0001535
Michel Caillaud
407 Europe Echecs 286 10/1982
Roger Diot zum Gedenken
3. ehrende Erwähnung
P0001535
(13+11)
#1
R: 1. Se6-g5 Sc6-b8 2. Sc7-e6 Sd4-c6 3. Sa8-c7 Sb3-d4 4. a7-a8=S Sc1-b3 5. a6-a7 Sb3-c1 6. a5-a6 Sc1-b3 7. a4-a5 Sb3-c1 8. Se6-f8 Sc1-b3 9. Sc7-e6 Sb3-c1 10. Sa8-c7 Sc1-b3 11. a7-a8=S Kg6-h6 12. a6-a7 c2-c1=S 13. a5-a6 c3-c2 14. b4xBa5 c4-c3 15. c3xLb4 Ld6-b4 16. c2-c3 Lf4-d6 17. a3-a4 Lh6-f4 18. a2-a3 Lf8-h6 19. h6-h7 g7xSf6
play all play one stop play next play all
Schwarz Schläge: gxf6; hxgxf. Weiße Schläge: dxe3; exf3; fxg; cxbxa. Der schwarze Bauer a7 wurde auf seiner Linie geschlagen. Um die Stellung aufzulösen, muß der sLf8 über h6 auf sein Ausgangsfeld zurückgespielt werden. Schwarz ist am Zug.
Yoav Ben-Zvi: When the second unpromoted WP uncaptures a BB on b4 it must retreat in all haste to f8 so that BK must stand on g6 (not h6) and unpromoted BP must stand on c4 (not c5). This determines the side-to-move in the diagram position. Is it justified to consider a conflict between pieces of the same color a Retro opposition? (2018-4-3)
comment
Keywords: Retro Opposition, Promotion
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-4-3 more...
12 - P0001568
Michel Caillaud
438 Europe Echecs 310 10/1984
Lob
P0001568
(12+13)
h#1,5*
* 1. ... ... 2. 0-0-0 Tb8#
1. ... d6 2. Lf7 (nicht 0-0-0?) Tb8#
play all play one stop play next play all
Schlagfälle und Umwandlungen: axb, bxc, cxd, h=; dxc, exf, fxe, hxg, a=
Henrik Juel: Maybe the stipulation should be h#1: 1.0-0-0 Rb8#. The castling is preserved by -1.Bb8 Ba5 -2.Kg1 Bb6 ... -10.Kb4 Bb6 -11.Ka5 Ba7 -12.Ka6 g4 -13.Kb7 Bb6 -14.Kc6 Ba5 -15.Rb6 Ba6 etc. (2003-4-14)
Michel Caillaud: Correct stipulation : h#1,5*
Set : 1.0-0-0 Rb8#
Play : 1...d6 2.Bf7 (not 0-0-0?) Rb8# (2003-4-15)
Yoav Ben-Zvi: Release of the position without moving BK and BRa8 requires that WK retracts to c6 (to shield the BK from WBa4) via a3,b4,a5,a6,b7. When WK is retracted from a5 to a6, BB must be standing on a7 (to shield WK from BRa8) and Black must respond with retraction of BPg4-g3. This implies that, when WK is retracted from b4 to a5, BB cannot stand on a7 (as Black would then need to use his only tempo retraction too early) so it stands on b6 while WB stands on b8 (WB cannot stand on a7 as this would be a Retro-opposition preventing Black's following retraction BBa7-b6). WK does not have a triangulation available on the retro-path from h1 to b4 so the configuration of WKb4, WBb8, BBb6, BPg3 with White to play the next retraction can only be achieved, under the assumption of Black retaining castling rights, if it is Black to move in the diagram position. This means 0-0-0 is available in the set play but not in the solution (reversed because of the H#1.5 stipulation). (2018-4-5)
comment
Keywords: Cant Castler, Retro Opposition, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-4-6 more...
13 - P0001605
Dmitri W. Pronkin
Andrey Frolkin

475 Europe Echecs 337 01/1987
P0001605
(1+16) C+
BP in 17,0
1. d3 h6 2. Lg5 hxg5 3. h4 Txh4 4. a4 Txa4 5. Th6 Sxh6 6. g4 Sxg4 7. Lg2 Sxf2 8. Lc6 Sxc6 9. d4 Sxd4 10. c4 Sxe2 11. c5 Sxg1 12. c6 dxc6 13. Dd4 Dxd4 14. Ta3 Dxb2 15. Th3 Lxh3 16. Sc3 0-0-0 17. Sd5 Txd5= patt!
play all play one stop play next play all
Henrik Juel: Black makes 15 captures.
The first 13.0 moves are correct by Euclide 1.0, but it takes some 4 minutes, so a complete test would probably take more than a day (2014-12-9)
paul: Jacobi checked the last 16 moves (in about 20 min). (2018-5-10)
Mario Richter: I would like to label this problem as a "Massacre PG", but the current definition of that term only knows of two-sided MPGs. Perhaps we could make the same differentiation as for "Homebase"?!
Btw., wasn't "popeye" best for such massacres?
rawbats confirms complete correctness of the problem after approx. 25 minutes. (2018-5-11)
Henrik Juel: Yes, Mario, Popeye is fairly good at this type
C+ by Popeye 4.61 in 57 minutes (2018-5-11)
A.Buchanan: @Mario: yes I agree it would be good to make massacre more specific. There are 69 massacres currently, almost all 2-sided, but maybe also some series-movers (unique or non-unique) which are currently not counted? (2018-5-12)
comment
Keywords: Unique Proof Game, Castling, Homebase (w)
Genre: Retro
Computer test: rawbats
Reprints: 116 Shortest Proof Games 11/1991
20a 64 Proof Games 2012
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-5-11 more...
14 - P0001664
Leonid M. Borodatow
533 Europe Echecs 373 10/1990
P0001664
(8+9)
Wer gewinnt?
Beispielauflösung (mri)
R: 1. Sa3-b1 e3xBd2 2. Sb5-a3 f4xLe3 3. Lc5-e3 g5xSf4 4. La3-c5 h6xDg5 5. Lc1-a3 h7-h6 6. b2xTc3 Tf3-c3 7. Sg6-f4 c3-c2 8. Lb3-d1 Tf8-f3 9. Lg8-b3 Ta8-f8 10. f7xDg8=L Dd8-g8 11. Df4-g5 Kd1-e1 12. Sd6-b5 Kc2-d1 13. Sc8-d6 Kb3-c2 14. Df1-f4 Kc4-b3 15. Dd1-f1 Kd5-c4 16. f6-f7 Ke6-d5 17. Kf1-g1 d4xBc3 18. c2-c3 Kf7-e6 19. Ke1-f1 d5-d4 20. Sb6xLc8 e6xBd5 21. c4xSd5 Se3-d5 22. b3xTc4 Sf1-e3 23. f5-f6 Ke8-f7 24. f4-f5 Se3xLf1 25. f2-f4 Tf4-c4 26. Sc4-b6 Tf8-f4 27. Sa3-c4 f7xTe6 28. Sb1-a3 Tg8-f8 29. Ta6-e6 Sd5-e3 30. Ta1-a6 Sf6-d5 31. a2xSb3 Sc5-b3 32. Sf8-g6 Th8-g8 33. Se6xLf8 Sg8-f6 34. Sf4-e6 Sa6-c5 35. Sh3-f4 Sb8-a6 36. Sg1-h3
play all play one stop play next play all
AV: Les Noirs ont le trait et gagnent. Derniers coups : 1 bxT(D,C)c3 h7-h6 2 Fc1-a3 hxT(D)g5 3 Fa3-c5 gxD(T)f4 4 Fc5-e3 fxFe3 5 Cb5(c4)-a3 exPd2 6 Ca3-b1. (2005-6-28)
hans: Dont think this solution is correct (Ld1 is promoted pawn on g- or e-line) (2018-5-24)
Henrik Juel: Good to hear from you again, Hans
I think that the AV solution is OK
With German-like notation the retroplay could be
-1.Sa3 e3xPd2 -2.Sb5 f4xLe3 -3.Lc6 g5xSf4 -4.La3 h6xTg5 -5.Lc1 h7 -6.b2xTc3
The other captures by White pawns were: a2xb3xc4xd5 and, e.g., f7xe8=L
[Pf7] went something like f7xDe6xPd5xPc4-c3-c2 (2018-5-24)
Henrik Juel: ... more precisely: a2xb3xc4 and cxd (2018-5-24)
Henrik Juel: ... and -3.Lc5, not Lc6 (2018-5-24)
comment
Keywords: Retro Opposition, Whose move?, Promoted material on the board
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-5-25 more...
15 - P0001722
Thomas R. Dawson
Charles Edward Kemp

5677 The Fairy Chess Review 8 10/1943
P0001722
(8+12)
h=Retropatt in 3
R: 1. Kf7xSe7 Sc8-e7 2. Kg8xTf7 Tc7-f7! 3. 0-0 Td7-c7 Retropatt
play all play one stop play next play all
Henrik Juel: Stipulation should be 'help-retrostalemate in 3'. -0... Kf7xSe7 -1.Sc8 Kg8xTf7 -2.Tc7! 0-0 -3.Td7 and Black is retrostalemate. Not a defensive retractor, but a help retractor with a weird aim. (2004-3-18)
Sally: Zurück:
1. Kd7xSe7? - Sg8-e7,
2. Kc8xTd7? - Tg7-d7,
3. O O O??? - Tfg7!
In der Verführung wäre die Rücknahme der langen Rochade illegal, da der w. Bauer a2 als Schlagobjekt im Osten gebraucht wurde und sich auf "a8" umwandelte. Somit musste der
schwarze Turm auf "a8" bereits gezogen haben! (2018-6-5)
comment
Keywords: Help retractor, Symmetrical position, Asymmetrical solution, Castling
Genre: Retro
Reprints: 336 FIDE Album 1914-1944/III 1975
H28 ASymmetrie 2013
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-6-5 more...
16 - P0001863
Nikita M. Plaksin
Rex Multiplex 1985
3. Preis
P0001863
(13+12)
#1
hans: 1. e6-e7# (not 1. … Dxh5#)
R: -1. … Sd5-b6 -2. d7-d8=L Se3-d5 -3. c6xLd7 Sg4-e3 -4. c5-c6 Sh6-g4 -5. b4xLc5 Lg1-c5 -6. a3xLb4 g2-g1=L -7. a2-a3 g3-g2 -8. c3-c4 g4-g3 -9. c2-c3 g5-g4 -10. g4xSh5 De1-e2 -11. g2-g4 Sg3-h5 -12. Kh5-g6 Se2-g3+ -13. Kg6-h5 Ke7-f8 -14. Kh5-g6 Kd6-e7 -15. Tg6-g7 Tg7-h7 -16. Lh7-g8 and cage is open.
captures black: exf, fxe [Lc1] (2012-9-14)
Brassaud: Agree with Hans untill 12) .. Se2g3+ and then 13) Tg6f6, Tf6f5 and cage is open. (2018-3-2)
comment
Keywords: Promotion, Whose move?
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 2001-3-18 more...
17 - P0001901
Thomas R. Dawson
The Pittsburgh Gazette Times 1915
P0001901
(9+12)
Ergänze eine wD, dann #1
+wDe8: 1. Sc3#
R: 1. Ka3-a2 e7-e8=D
play all play one stop play next play all
Henrik Juel: Analysis
White pawns captured all four missing black men by axb, bxa, and cxbxa, and he promoted [Ph2] on h8 (and possibly [Pe2] on e8)
Black pawns captured all five (after addition) missing white men by e7xf6 and h7xPg6x...xc2
-1... Ka1 -2.Tb2 Kb1 -3.Ta2 Ka1 -4.Tb2 Ka2 -5.Tb1 leads nowhere, so -5... Ka3 D=Pe7 must happen sooner or later (2018-2-23)
Henrik Juel: all six, not five, of course (2018-2-23)
comment
Keywords: Add pieces, Promotion, Promotion in the retro play
Genre: Retro
Reprints: Arnhemsche Courant 24/12/1926
103 Caissa's Wild Roses in Clusters 1937
344 FIDE Album 1914-1944/III 1975
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-2-23 more...
18 - P0001970
Thomas R. Dawson
26 Kongreßbuch Teplitz-Schönau 1923
P0001970
(13+13)
h#1
1. exf3ep Lc2#
play all play one stop play next play all
1.exf3e.p. Bc2# is the only possible solution, but this necessitates R: 1.f2-f4. Can we prove this?

(13+13) with 1+2 pawn captures. Bf8 captured at home, so to satisfy White appetite, the missing Black pawn (a or b) must have promoted via c2 on c1. Two more White units must be captured to allow this.

The kings cage can only be unlocked by retracting WPc2. But the clock is ticking as there are only 6 black moves which can be retracted.

The promoted piece was captured on e3 or h3. If either capture is undone, then a White bishop square is cut off, so WB must be replaced prior to this.

Now the order of the early moves is: WdP moves, WQB & WQR escape, BP promotes on c1 to X (capturing WR at some point), X captured by WP.

So the first White capture must be dxNe3 and the second White capture releases gxXh3. The second White capture releases WKB & WKR. WKR captured by original BfP.

The clock starts ticking with gxh3. Black has 6 pawn moves. WKB has 3 moves to reach h7. WR has 3 if it goes via d file, or 2 if it starts on g1 (in which case WfP or WQB must also move once). So certainly at least 6 White moves. Last move was therefore White (even if the stipulation didn't tell us), and it can only have been WfP coming from f3 or f4. If it had been coming from f3 it would have blocked WKB in its progress, so the last White move was indeed R: 1.f2-f4.

WKR did therefore move from g1-g4-e4, and R: 1. ... fxRe5 2. Rg4-e4. Prior to that, move order not unique, but counting still exact.

Note that WN loitering on b4, pretending to be part of the cage, is present on the board just to make up the numbers.
Jeliss: "Obstruction of passage square f3 to Bishop of same colour."

"Version 'Pittsburgh Leader' 08.06.1913"
Henrik Juel: -1.f2 f5xTe4 -2.Tg4 f6 -3.Tg1 f7 -4.Le4 h5 -5.Lg2 h6 -6.Lf1 h7 -7.g2xDTSh3, unpromote DTS on c1, etc. (2004-3-18)
Henrik Juel: Nice analysis, Andrew, but your last comment seems incorrect.
Without Sb4, 1.b4 Txb4+ is not mate because of 2.Txb4#! (2013-7-26)
A.Buchanan: Thanks Henrik, I have fixed the solution. Forward chess is even harder than retro chess. And because Rb7 is retro-pinned, I overlooked that it's not forward-pinned! (2013-7-27)
Yoav Ben-Zvi: Appears as the first problem (D445) in the booklet on Dawson's RA problems by G.P. Jellis. The obstruction that occurs in the Try -1.Pf3-f4?, by WP of WB, is described as "obstruction of passage square". It is not considered by Dawson and his disciples to be a Retro opposition. Dawson's conception of RO was quite broad, it included cases where the interference was not by occupation of the target square, so the only valid reason that I can see to exclude this case is that the 2 pieces involved are both of the same color. Fabel's definition explicitly excludes "Monochrome RO". I conclude that it would be preferrable to interpret RO as a bi-chromatic interference. The keyword Retro opposition should be removed. (2018-4-7)
comment
Keywords: Last Moves?, En passant as key
Genre: h#, Retro
Reprints: D445 Retro-Opposition [Jelliss] 1989
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-4-9 more...
19 - P0002098
Max Lange
Handbuch der Schachaufgaben [Lange] 1862
P0002098
(6+9)
#1
1. axb6ep#
play all play one stop play next play all
Eine sehr frühe (erste?) Darstellung des retroanalytisch begründeten en passant Schlages. (\eb)
ML schreibt dazu: "In dieser Position läßt sich die Voraussetzung des exceptionellen Zuges begründen...".
TBr: Nein, nicht erste Darstellung, siehe P0001360 (ebenfalls von Max Lange), das wohl das erste korrekte Retro überhaupt zu sein scheint. (2015-9-6)
Yoav Ben-Zvi: WBe2, WPd5 and BPg7 can be removed. (2018-3-1)
A.Buchanan: I think wPd5 is needed so that bK can’t unmove with check from b7 (2018-3-1)
more ...
comment
Keywords: En passant, En passant as key
Genre: Retro
Reprints: 57A Retrograde Analysis 1915
K588 Problemkiste (110) 04/1997
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2015-9-10 more...
20 - P0002122
Wolfgang Hundsdorfer
Deutsches Wochenschach 03/10/1909
P0002122
(13+12)
#3
1. fxe6ep! Txe6+ 2. Lxe6+ Kxh5 3. Dg4#
1. ... Lh7+ 2. Lf5+ Kxh5 3. Dg4#
R: 1. ... e7-e5 2. Ke5-e4 Tf6-d6
play all play one stop play next play all
Yoav Ben-Zvi: The 4 missing BPs are all needed to account for 4 WP captures. [BPa7] and [BPb7] capture all 3 missing White pieces to promote on c1 so [BPc7] does not capture and also promotes on c1. Therefore White's last move could not be -2.WPc4xd5 or -2.WKe3-e4 (forcing -2...BPc5xd4) as, in both cases, the path to promotion of [BPc7] is closed off. This implies that White's last move was WKe5-e4 preceded by BRf6-d6.
The e.p. key opens up 2 checks for Black but closes off the threatened mate on d5. The skill shown by the pioneers of RA in dressing up their problems with an orthodox stipulation is to be admired but also shows why it was neccessary to shed this practice in order to make further progress. (2018-3-22)
Henrik Juel: C+ by Popeye 4.61 (after analysis) (2018-3-22)
more ...
comment
Keywords: En passant
Genre: Retro
Reprints: 69B Retrograde Analysis 1915
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-3-22 more...
21 - P0002139
Aleksey A. Troitzky
Bohemia 1910
P0002139
(14+14)
#2
Henrik Juel: 1.bxc6ep+. -1... c7 -2.Tc6 etc.
Not -1... c6? -2.Lc7 and the tempo is wrong. (2004-3-8)
Yoav Ben-Zvi: -1...BPc6-c5? -2.Bc7-b8 leads to a Retro-opposition between the bishops on b8 which cannot be resolved by switching the side to move due to the Parity Argument (for the moves of the bishops) and lack of a tempo retraction for either side. This part was shown in P0002141. The WB must stand on b8 when Black retracts BPc7-c6/c5 (releasing WRb6 and opening the North-West cage) because standing on d8,e7,f8 it cannot be released from the back rows before BBa4 is retracted home to c8 (to allow retraction of BPd7-d8) but the release of BBa4 from the South cage awaits the retraction of WB home to c1 (to allow retraction of WPd2-d3) causing a deadlock (the release of WBc1 and BBc8 must each precede the other so neither can come first).
Retro-opposition (supported by the Parity argument) combined with a clever deadlock argument, refute a Try thus justifying the En Passant key of a #2. An impressive achievement at the time that remains beautifull when viewed today. (2018-2-18)
A.Buchanan: In the world of chess problems, it amazes me that (1) so many different ideas can be conceived (2) so many of those can be realized. (2018-2-19)
comment
Keywords: En passant, Retro Opposition
Genre: Retro, 2#
Reprints: 79 Retrograde Analysis 1915
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-2-19 more...
22 - P0002277
Karlheinz Bachmann
v Die Schwalbe 104, p. 217, 04/1987
1. ehrende Erwähnung
P0002277
(11+15)
BP in 48,0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Sd5 9. Th1 Sb6 10. Tg1 Sa8 11. Th1 b6 12. Tg1 La6 13. Th1 Dc8 14. Tg1 Db7 15. Th1 Df3 16. gxf3 h5 17. Lh3 h4 18. Le6 h3 19. La2 Lc4 20. Lb1 La2 21. b3 Sa6 22. Lb2 Sc5 23. Lf6 gxf6 24. Kf1 Lh6 25. Kg1 Kf8 26. Df1 Kg7 27. Dg2+ hxg2 28. h4 Kg6 29. Kh2 g1=S 30. Kg2 Lf4 31. h5+ Kg5 32. h6 Lg3 33. h7 Sh6 34. Th4 Tb8 35. Tb4 Tb7 36. f4+ Kh4 37. h8=T Sf3 38. Tg8 Se5 39. Tg5 Sg6 40. Kf3 Kh3 41. Ke3 Kg2 42. Te5 Kf1 43. Kf3 Ke1 44. Kg2 Kd1 45. Kf1 Kc1 46. Ke1 Kb2 47. Kd1 Ka1 48. Kc1 Sh8
play all play one stop play next play all
paul: Correction of P0000067. (2018-3-3)
comment
Keywords: Unique Proof Game, Length Record, Non-standard material, Promotion (Tss)
Genre: Retro
Reprints: 82 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2006-1-10 more...
23 - 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)
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...
24 - P0002619
Raymond Smullyan
The Chess Mysteries of Sherlock Holmes 1979
P0002619
(15+13)
Darf Weiß noch rochieren?
Yoav Ben-Zvi: Appears on page 54 of the Book. WPb4 and BPg5 both captured Rooks. Neither BR could have escaped from the bottom rows, to be captured by [WPa2], before capture of the WR cleared the h column. It follows that the WR was captured first with WP still on column a and therefore the captured WR could not have come from a1 and was originally from h1 escaping through the h column. WRh1 is a "Sibling Impostor" and White "Can't Castle". (2018-3-15)
Henrik Juel: It seems that Lc1 is unnecessary
Even without it, White cannot castle, by a very similar argument; the only difference is that Th1 might be [Th1], but if so, it must have moved to make way for [Ta1] (2018-3-15)
comment
Keywords: Castling (wk), Cant Castler, Impostor (T)
Genre: Retro
Reprints: Schach mit Sherlock Holmes 1982
(A) Probleme für Tiger 4 04/1984
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-3-15 more...
25 - P0002628
Raymond Smullyan
The Chess Mysteries of Sherlock Holmes 1979
P0002628
(3+2)
#1
Aprilscherz!
1. b8=sS#
play all play one stop play next play all
vgl. P1349637
Mario Richter: Could be, inspired by P1349637, presented as twin: a) diagram, b) +sSb8 (2018-5-2)
Ladislav Packa: Mario: Position b) would be enough. H#1*: 1...bxa8=R#, 1.Sd7 b8=S# (2018-5-2)
comment
Keywords: Joke, Joke promotion (s)
Genre: Fairies
Reprints: Schach mit Sherlock Holmes 1982
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-5-2 more...
26 - P0003126
Nissim Shirin
2189 Shahmat 04/1986
P0003126
(8+13)
h#2
1. fxe3ep Txc5 2. Le4 Sxb3#
play all play one stop play next play all
Der ep-Schlüssel ist nicht gerechtfertigt, weil zuletzt auch f3xTe4 geschehen sein kann.
Mario Richter: Something must be wrong here: White's last move might have been f3xTe4, so ep-key is not justified (2018-3-26)
comment
Keywords: En passant as key
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-3-29 more...
27 - P0003396
Tivadar Kardos
Festgrüße 1956
P0003396
(8+16) C+
h#2
1. Kd4! bxc5 2. Ke5 d4#
1. axb3ep? Txe1 2. Sd3 Txe4# (illegal)
play all play one stop play next play all
1. axb3ep? ist illegal, weil zuletzt R: 1. g7-g8=S geschehen sein konnte
vgl. P1348363
Henrik Juel: C+ by Popeye 4.61
The possibility of a promotion as last move shows that the ep capture cannot be legitimized
But the ep capture also seems illegal, as Black pawns captured all missing white men, including [Lc1] (2018-3-22)
A.Buchanan: Perhaps this is deliberate: to construct an e.p. problem which does not rely on the e.p. convention. (2018-3-22)
Yoav Ben-Zvi: This differs from P1348363 by the addition of the WP on a5 and removal of the Twin that shows the e.p. in the solution. In the present version the promotion to WN is uniquely determined to be White's last move. The Twin can be replaced with: b) -WNg8 leading to model mates. I think the idea of an illusionary e.p. used to trap the sophisticated solver was attempted in P1346195. (2018-3-24)
A.Buchanan: I made P1261604 to have illusionary en passant hxg to distract from the real en passant action elsewhere. (2018-3-24)
A.Buchanan: There's a set of problem in W.Keym's Eigenartige Schachprobleme (a section called "Bosheiten im Einzüger") 308-324, pages 100-105) which explore castling, en passant and the move in various combinations of real and try play, within the context of #1 problems. Most are by Keym himself, but Fabel makes a few appearances. Not sure if these problems are all in PDB yet. (2018-3-25)
Olaf Jenkner: Would it be possible to improve the retro content by moving bPh6 to h7 and replacing Ng8 by Bh8? (2018-3-25)
Olaf Jenkner: I overlooked Bg7-h8 so nothing would be changed. (2018-3-26)
more ...
comment
Keywords: En passant as key
Genre: h#, Retro
Computer test: Popeye 4.61
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-3-26 more...
28 - P0003405
Laszlo Lindner
Magyar Sakkvilag 1943
3. Preis
P0003405
(4+16) C+
h#2
b) sBf3 nach e3
a) 1. Lxd4 Txb3 2. Tc5 Sd2#
R: 1. Kg3-h4 2. gxf3ep+

b)
R: 1. d2-d4, dann 0. ... d2-d4
1. e4xd3ep Kxh3 2. d4 Sa3#
play all play one stop play next play all
Ob der Zwilling b) schon im Original vorhanden war, ist nicht sicher, im Nachdruck in 'Problem [Zagreb]' fehlt er, dafür kommt er in einem Artikel von . Petrovici zum "Thema Than" von 03/2016 vor.
Mario Richter: @Alfred: Wieso funktioniert Abspiel-Button für b) nicht?? (2018-3-22)
A.Buchanan: @Mario, @Alfred: the problem is that the b solution follows the retro bit, and the parser think that it's retro too. If I remove the retro part, b) works fine. I don't know how to reset the parser so it's going forwards again. Normally I just put the R part after the forwards part, but that won't work here because there's twins. (2018-3-22)
Alfred Pfeiffer: Keine Ahnung, warum das Nachspielen von b) nach dem Retro-Part von a) nicht funktioniert. Evtl. ein Bug im Proramm. Das sollte Gerd Wilts prüfen.
Ein Tausch der Lösungen b) und a) in der Textreihenfolge erlaubt das Nachspielen, (2018-3-22)
comment
Keywords: En passant as key, En passant in the retro play, Than theme
Genre: h#, Retro
Reprints: (II) Problem 37-40 09/1956
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-3-22 more...
29 - P0003447
Gerd Rinder
(O) Die Schwalbe 16, p. 393, 10/1972
P0003447
(14+13) C+
h#2 (pRA)
1. Txg3 Sxg3+ 2. Kf3 0-0#
1. cxd3ep Lxg1 2. e2 Sd2#
1. gxf3ep Lxg1 2. Dd3 Txh4#
play all play one stop play next play all
VL: This problem was first published in the article entitled "Konstruktive Kritik am Kodex von Piran" (by W.Keym; H.16). The author is a strong opponent of the retro-synthese (including AP a la Keeble--Petrovic = "Typ Petrovic"). Here we meet a retro-situation resembling that of AP, which, however, is interpreted and resolved purely in the framework of pRA. Namely, the problem contains three retro-variants: (a) 0-0; (b) 0-0-0 & cxd3 ep; (c) 0-0-0 & gxf3 ep. Each of them results in a unique (partial) solution (see above), so that the problem is sound. The absence of 0-0-0 in the latter two solutions is a witty feature that emphasizes a fundamental distinction from AP (where only actual castling can legalize the ep-key). Judging from the article "PRA oder Kodex" by B.Pavlovic in the "Problem", 152-6, where this problem is reproduced, it was initially stipulated "h#2, PRA-Typ Rinder" (this is presently known under the name "Typ Keym"). It is reproduced also in the book "Eigenartige Schachprobleme" by W.Keym, 2010, Pr.385. (2012-8-26)
Sally: Hier schlugen die w. Bauern dreimal, unter anderem eine UW-Figur von "h1 oder "a1",(entweder ist 000 oder 00 zulässig).
Der letzte Zug war 1. K-e1, oder T-a1, oder "d2-d4". oder
"f2-f4". Falls 000 zulässig ist, dann ist 00 unzulässig und jeweils einer der E.-P.-Schläge erlaubt, Also löst entweder:
1. Bg4xf3 E.p.! - Lxg1, 2. Dd3 - Txh4#. oder :
1. Bc4xd3 E.p.! - Lxg1, 2. Be2 - Sd2#.
Beide Male wird das Zugrecht 000 anerkannt, aber nicht aufgeführt! Falls 00 zulässig ist, dann ist 000 unzulässig;
in diesem Fall war zuletzt der Zug "T-a1" möglich, daher kein E.p.-Schlag erlaubt. Also löst :
1. Txg3! - Sxg3+, 2. Kf3 - 00 #. (2018-6-15)
Henrik Juel: C+ by Popeye 4.61, after analysis (2018-6-15)
more ...
comment
Keywords: Castling, En passant as key, a posteriori (AP)
Genre: h#, Retro
Computer test: Popeye 4.61
Reprints: (II) Problem 152-156 04/1973
XI Caissas Schloßbewohner 1 1983
(13) Die Schwalbe 241 02/2010
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-6-16 more...
30 - P0003518
Oskar E. Vinje
3376 The Fairy Chess Review 14 10/1938
P0003518
(12+10)
h#2
1. Sf7 Td6 2. Tf8 Sxg7#
Not
1. Sf7 Txh6 2. 0-0? Sxe7#
play all play one stop play next play all
Henrik Juel: The missing white TLD were captured on the first row; additionally black captured d7xc6, so [Ph2] promoted and [Pf7] was captured on its file. To preserve the black castling, White must have captured hxgxh7xg8; but only two black men were available for capture: DS. So Black may not castle, and 1.Sf7 Txh6 2.0-0? Sxe7 is not a solution. (2010-12-15)
Mario Richter: Henrik, your analysis is not complete: it is also possible, that an original white piece was captured on c6 (wRh1 or one of the wNN), thereby allowing the promotion on g8 without visiting f7. But in this case, the promoted piece is still on the board, and regardless if it is the wR or one wN, to leave the promotion square g8 was only possible by destroying Black's castling right. (2010-12-16)
Henrik Juel: Good point, Mario. This only makes the problem even better. They knew what they were doing back in 1938. (2010-12-16)
A.Buchanan: Solution & retro try echo one another. (2018-3-17)
more ...
comment
Keywords: Cant Castler, Castling (sk)
Genre: h#, Retro
Computer test: C+ Popeye for the h#2, with manual thinking for the retro aspects.
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-3-17 more...
31 - P0003536
Paul Leibovici
347 Sahovski Vjesnik 02/1949
P0003536
(2+6) C+
h#2
1. 0-0-0? (illegal!)
1. Kf8 Da1 2. Te8 Dxg7#
play all play one stop play next play all
Der wK kann h8 nur via f7 oder f8 erreicht haben, der sK hat also schon gezogen.
Klären: Datum =02/19?9
Henrik Juel: C+ by Popeye 4.61
Not 1.0-0-0+? Kh7 2.Td7 Da8
because Ke8 has moved to let Kh8 in (2018-2-24)
more ...
comment
Keywords: Cant Castler, Castling (sg)
Genre: h#, Retro
Computer test: Popeye 4.61
Reprints: 12 Volzhskaya kommuna 01/04/1977
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-2-26 more...
32 - P0003701
Istvan Persa
4411 Magyar Sakkelet 11/1980
P0003701
(3+5) C+
h#2
b) sBf7 nach g7
a) 1. 0-0-0 Sc6 2. Td7 La6#
b) 1. Kf8 Lc4 2. Te8 Sxg6#
play all play one stop play next play all
Henrik Juel: C+ by Popeye 4.61 (after analysis)
In part b Black may not castle, because Ke8 has moved to let Kh7 through (2018-3-23)
comment
Keywords: Cant Castler, Castling, Than theme
Genre: h#, Retro
Computer test: Popeye 4.61 (after analysis)
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-3-24 more...
33 - P0003831
Vasile I. Tacu
RA35 diagrammes 21 05-06/1976
P0003831
(8+8)
Nur die Bauern haben geschlagen; alle 16 Bauern haben sich umgewandelt. Sind alle 4 Rochaden noch zulässig?

Duplicate Diagram: P1004154, P1176381, P1258300

Henrik Juel: Yes, all four castling rights may be preserved, I believe
A feasible proof game seems possible with these 8+8 pawn captures
White axb, bxc, cxb, dxc, exfxg, fxg, hxg
Black axb, dxc, exdxc, fxg, gxhxg, hxg
[Pg2,Pb7,Pc7] promoted without capturing (2018-2-17)
A.Buchanan: I think one capture less for e pawns suffices. The second to move off the file can go to e2 or e7 and promote to minor piece (2018-2-18)
Henrik Juel: Yes, I saw that; but it is stipulated that all captures were made by pawns, so it was natural to change exf to exfxg (2018-2-18)
A.Buchanan: The requirement that all captures are made by pawns seems extraneous. The 16th capture might be made by any of the pawns, so why use it to hide the nice subtlety on the e-file? (2018-2-18)
Henrik Juel: To force the sublety, you could add a black rook on a7, but that would destroy the neat diagram position (2018-2-18)
A.Buchanan: I agree Henrik. There is a curious way to "force the subtlety" in your excellent phrase, by *reversing* the first (unnecessary) condition. It could state instead: "Not every capture was made by a pawn." (2018-2-19)
comment
Keywords: Promotion, Castling (wkwgsksg), Homebase (2), Aristocrat, Symmetrical position
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-2-18 more...
34 - P0004655
Michel Caillaud
(6) Problem 206-210 07/1981
2.-3. Preis e.a.
61. Thematurnier
(Branko-Pavlovic-Gedenkturnier 1980/1981)
P0004655
(12+13)
#1 (wer?)
1. ... Td4!#
1. Ta5#?
R: 1. Lb8-a7 Sh6-g8 2. Lc7-b8 Sg8-h6 3. Ld8-c7 Sh6-g8 4. e6-e7 Sg8-h6 5. Le7-d8 Sh6-g8 6. Lf8-e7 Sg8-h6 7. Lg7-f8 Sh6-g8 8. Lh8-g7 Sg8-h6 9. h7-h8=L Sh6-g8 10. Lg6-h5 Sg8-h6 11. h6-h7 d4-d3 12. h5-h6 Sh6-g8 13. h4-h5 h5xSg4,h5xDg4
play all play one stop play next play all
Schlagfälle und Umwandlungen: axb, bxc, cxd, h=; dxe, exd, gxf, hxg, a=
61. TT (Pavlovic Memorial), Gruppe A
Yoav Ben-Zvi: To release the position WBa7 is unpromoted on h8 and retracts back to h4 to allow BPh5xg4. When White retracts WPh6-h7 BN stands on g8 and as retraction of BNh6-g8 is prevented due to Retro-opposition, Black needs to use his only tempo retraction BPd4-d3 and White must immediately release the opposition by retracting WPh5-h6 which implies that WB must be standing on g6 (not on h7 as it would obstruct the unpromotion or on h5 as it would obstruct the retreat of the pawn to h5). The configuration of WPh7, WBg6, BNg8 with White to play the next retraction can only be achieved if it is Black to move in the diagram position. (2018-4-5)
more ...
comment
Keywords: Retro Opposition, Promoted material on the board, Whose move?
Genre: Retro
Reprints: feenschach 60, p. 458, 05/1982
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-4-6 more...
35 - P0005363
Hans Klüver
stern 02/04/1966
P0005363
(16+16)
Erfinden Sie eine möglichst kurze Schachpartie, in der durch den Umwandlungszug "Bauer wird Springer" das Matt erfolgt!
1. d4 e5 2. Kd2 exd4 3. b3 d3 4. Kc3 dxe2 5. Kb2 exd1=S#
play all play one stop play next play all
Cook: Alternative Zugfolgen
1. d4 e5 2. b3 exd4 3. Kd2 d3 4. Kc3 dxe2 5. Kb2 exd1=S#
1. d3 e5 2. Kd2 e4 3. Kc3 exd3 4. b3 dxe2 5. Kb2 exd1=S#
1. d3 e5 2. Kd2 e4 3. b3 exd3 4. Kc3 dxe2 5. Kb2 exd1=S#
1. d3 e5 2. b3 e4 3. Kd2 exd3 4. Kc3 dxe2 5. Kb2 exd1=S#
1. b3 e5 2. d4 exd4 3. Kd2 d3 4. Kc3 dxe2 5. Kb2 exd1=S#
1. b3 e5 2. d3 e4 3. Kd2 exd3 4. Kc3 dxe2 5. Kb2 exd1=S#
more ...
comment
Keywords: Non-Unique Proof Game, Construction task, Umwandlung im Mattzug, under-promotion (s)
Genre: Retro
Reprints: Die Stern-Schachprobleme 10/1991
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-6-2 more...
36 - P0005364
Hans Klüver
stern 04/05/1967
P0005364
(16+16)
Erfinden Sie eine möglichst kurze Schachpartie, in welcher der Mattzug durch den En-passant-Schlag eines Bauern erfolgt!
1) 1. e4,e3 e5 2. g4 Sc6 3. g5 d6 4. Dh5 Kd7 5. Lh3+ f5 6. gxf6ep#
2) 1. e4 e6 2. e5 Sh6 3. f4,h4 g5 4. fxg5,hxg5 Ke7 5. Dh5 f5 6. gxf6ep#
3) 1. e4 e6 2. e5 Sh6 3. Sc3 g5 4. Se4 Ke7 5. Dh5 f5 6. exf6ep#
4) 1. b3,b4 h6,h5 2. Lb2 f5 3. e4 Kf7 4. exf5 De8 5. Dg4 g5 6. fxg6ep#
5) 1. e4 h6,h5 2. Ld3 f5 3. De2 Kf7 4. exf5 De8,e5 5. De5 g5 6. fxg6ep#
6) 1. d4 d6 2. Dd3 Kd7 3. Dg6 f5 4. d5 Sc6 5. Lg5 e5 6. dxe6ep#
play all play one stop play next play all
Sally: Es gibt 3 Schlüsselzüge mit 1. Be4!
Hier können natürlich verschiedene Züge in allen Beispielen umgestellt werden. (2018-6-2)
comment
Keywords: Non-Unique Proof Game, En passant, Construction task
Genre: Retro
Reprints: Die Stern-Schachprobleme 10/1991
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2014-3-26 more...
37 - P0005976
Sergey I. Tkachenko
8821 Die Schwalbe 152 04/1995
P0005976
(11+2) C+
#1
1. ... Lxa8 e8=S#
1. ... Lxc8 Kc4#
1. ... Lxc6 Da3#
1. ... Lxa6 Dh6#
play all play one stop play next play all
Schwarz ist am Zug!
Sally: 1. Da3#?/ 1. Dh6#?/ 1. Kc4#?/ 1. Be8S#?
Aber natürlichist Schwarz am Zug
Die vier Mattzüge werden differenziert, also das Fleck-Thema im Retro-Gewand. Erfrischende Darstellung mit schwarzen Läufer-Stern. (2018-6-6)
Henrik Juel: Last move was obviously not made by Lb7, and Kd6 could not have moved from d7 (illegal check from Lc8) or from e6 (illegal double check), so White made last move, and it is Black to move
C+ by Popeye 4.61 (with 'ford #2 opt var nac') (2018-6-6)
comment
Keywords: Whose move?, Läuferstern, Umwandlung im Mattzug, under-promotion (S)
Genre: Retro, n#
Computer test: Popeye 4.61
Input: Gerd Wilts, 1995-7-1
Last update: Alfred Pfeiffer, 2018-6-6 more...
38 - P0005979
Frank Christiaans
8824 Die Schwalbe 152 04/1995
4. ehrende Erwähnung
P0005979
(11+3)
Letzter Zug?
R: 1. Ka5xBa4
play all play one stop play next play all
12 weiße Schläge: exd, fxexdxc; gxfxexd; hxgxfxexd, sLf8.
There was only one White pawn capture on c file, so if the BaP was not the last capture, it & BbP would have had to make 5 pawn captures, which is impossible.
doppelt veröffentlicht
Henrik Juel: A possible retroplay is
-1.Ka5xPa4 b5xLa4 -2.Sc3 b7 -3.e4xLd5 etc.
To reach the resulting position Black has captured [Lc1] on c1, axbxc, and cxd, and promoted [Ph7] on h1 (2018-4-2)
more ...
comment
Keywords: Last Move? (KxB), Type A, Economy record
Genre: Retro
Reprints: Sinfonie Scacchistiche 07/1995
Input: Gerd Wilts, 1995-7-1
Last update: A.Buchanan, 2018-4-2 more...
39 - P0006656
Thomas R. Dawson
Western Morning News & Mercury 1919
P0006656
(4+1)
Ergänze die wD, dann #1
+wDf5: 1. Db1#

R: 1. ... Kb1-a1 2. Se4-d2+
play all play one stop play next play all
more ...
comment
Keywords: Add pieces, Model mate, Rex solus (s)
Genre: Retro
Reprints: Arnhemsche Courant 24/12/1926
123 Caissa's Wild Roses 1935
Input: Gerd Wilts, 1996-7-16
Last update: Alfred Pfeiffer, 2018-2-26 more...
40 - P0007394
Ewald Reichel
(5) feenschach 40 11-12/1977
P0007394
(1+1)
Welches war der letzte Zug?
Längstzüger
R: 1. Ka2xSa1
play all play one stop play next play all
Vorgänger
Henrik Juel: I believe that 'White to move' should be added
This problem may very well have been made before, but an earlier appearance is nowhere to be found in the PDB (yet) (2018-2-18)
Yoav Ben-Zvi: Did Andrew, along with Henrik, miss the "Dead Reckoning" intention? (2018-2-18)
A.Buchanan: Never seen this problem before. 20 years before the dead position rule.

But I think there would still have been draw by insufficient material, which would have had the same effect here. The game ends before the knight capture.

Checkmate and pat of Black in Längstzüger are the same as in orthodox chess. Same if Black has just 1 legal orthodox move. It's only if Black has a choice that there is a difference.

So White doesn't have the move, and must have just captured something. But what? It must have been a rook, because the queen cannot checkmate as it will always have a longer move. But even then it seems hard for KvKR to co-operate for White to be mated.

In the middle of the board, can wK move next to bK in Längstzüger? That might allow wK to push bK around the board. So bK ends up on c2. This forces bR to h1. Now bK pushes wK to e.g. c3, and then moves to a3. bR can now mate on a1. Need to check the details of this, but it seems doable.

This is amazingly rich, and all based on draw by insufficient material rule. Was this the intention do you think? Certainly the stipulation seems to be correct. (2018-2-19)
A.Buchanan: Argh no, this doesn't work. Black K+R/Q can't checkmate wK under Längstzüger. wK can always wander somewhere so that bR has a longer move.
And the draw by insufficient material rule what was it when the problem was composed? The 1977 rules in Retro Corner have no such rule, either for FIDE or USCF. The 1993 FIDE rules say: "10.4 The game is drawn when one of the following endings arises: (a) king against king; (b) king against king with only bishop or knight; (c) king and bishop against king and bishop, with both bishops on diagonals of the same colour. This immediately ends the game."
Sorry for all the accidental line feeds in the last reply. (2018-2-19)
A.Buchanan: OK, it seems from the Glossary that black checkmate under Maximummer is normal. Not sure about check though, which we need if wK is going to "shoo" bK around the board. There is also an "Exacte Längstzüger" discussed in the German glossary here, which defeats my rudimentary German skills. (2018-2-19)
A.Buchanan: It boggles me that the 1977 Laws listed in Retro Corner (which are some kind of amalgam of FIDE & USCF rules) have no mention of Draw by Insufficient Material. Surely this would have been around before? A British chess instruction book in 1958 gives "too weak an army" as one of 5 ways that a game could be drawn, listing KBvK, KNvK & KvK as cases. (2018-2-19)
comment
Keywords: Maximummer, Last Move? (KxS), only Kings
Genre: Retro, Fairies
Input: Gerd Wilts, 1996-8-21
Last update: A.Buchanan, 2016-12-1 more...
41 - P0008416
Harry Goldsteen
Probleemblad 1 01-02/1989
P0008416
(10+15)
#1 (wer?)
Beispielauflösung (mri):
R: 1. ... Sh6-g8 2. f6xLe7 Kg8-h8 3. f5-f6 Kf8-g8 4. f4-f5 Ke8-f8 5. f3-f4 Lf8-e7 6. f2-f3 e7-e6 7. Se6-d8 Kd7-e8 8. Sf4-e6 Ke6-d7 9. Sh3-f4 Kf5-e6 10. Sf4-h3 Kg5-f5 11. Sd5-f4 Kh4-g5 12. Sf4-d5 Kh3-h4 13. Sh5-f4 Kg2-h3 14. Sg3-h5 Kf1-g2 15. Sh5-g3 Ke1-f1 16. Sf4-h5 Kd1-e1 17. Sh3-f4 De1-d2 18. Sf4-h3 Td2-c2 19. Sh3-f4 Sc2-a1 20. Ka1-b1 Sd4-c2 21. Lb1-a2 La2-b3 22. Sg1-h3 Tb3-c3 23. Sh3-g1 Tb6-b3 24. Sf4-h3 Dh1-e1 25. Sh3-f4 Dd5-h1 26. Sg1-h3 Tc2-d2 27. Sh3-g1 Tc3-c2 28. Sg1-h3 Tb3-c3 29. Sf3-g1 Tb5-b3 30. c3-c4 Dd8-d5 31. Se5-f3 Le6-a2 32. La2-b1 Kc2-d1 33. Ld5-a2 Kb3-c2 34. Lg2-d5 Kb4-b3 35. c2-c3 Kc5-b4 36. Kb1-a1 Kd6-c5 37. Kc1-b1 Kd7-d6 38. Sc4-e5 Ke8-d7 39. Sa3-c4 Lc8-e6 40. Lf1-g2 d7xDc6 41. Dh1-c6 Th5-b5 42. Kd2-c1 Sf5-h6 43. Ke1-d2 Th8-h5 44. Sb1-a3 Tg8-h8 45. Dh8-h1 g5-g4 46. h7-h8=D Th8-g8 47. h6-h7 Ta6-b6 48. h5-h6 h6xLg5 49. Lf6-g5 Sc6-d4 50. Lc3-f6 Sb8-c6 51. Ld2-c3 Ta7-a6 52. Lc1-d2 Ta8-a7 53. d2-d3 d3xSe2 54. Sg1-e2 c4xTd3 55. Ta3-d3 b5xTc4 56. Th4-c4 a6xDb5 57. De2-b5 a7-a6 58. Dd1-e2 h7-h6 59. Th1-h4 Sh6-f5 60. g5-g6 Sg8-h6 61. Ta1-a3 Sh6-g8 62. h4-h5 Sg8-h6 63. g4-g5 Sh6-g8 64. e2-e3 Sg8-h6 65. h2-h4 Sh6-g8 66. g2-g4 Sg8-h6 67. a2-a4
play all play one stop play next play all
Henrik Juel: 1.Sxf7#, not 1.. Rc1? -1.. Sh6 -2.f6:B Kg8 -3.f5 Kf8 -4.f4 Ke8 -5.f3 Bf8 -6.f2 e7 -7.Se6, bK retracts to d1, bQ to e1, etc. (2003-8-26)
Yoav Ben-Zvi: White's only capture was WPf6xBe7. All 6 missing White pieces were captured by BPs. [WPh2] accounts for one of the BP captures and did not itself capture so it must have promoted on h8 after [BPh7] captured on g file to clear the way. The promoted White piece could either replace a knight (moving to d8) or else it is itself captured by a BP.
When [BPa7] completed its fourth capture by BPd3xe2, WP stood waiting on d2 so [WBc1] was locked at c1. After its release [WBc1] is captured on g5 (only BP capture left on a dark square) followed by promotion of [WPh2]. This means [BPa7] could not have captured the promoted piece or [WBc1] so it did capture [WRa1] which escaped via a3 so [WPa2] must already have advanced to a4. Prior to BPh6xBg5 [WPg2] must advance to g6. This implies that the subsequent promotion on h8 was not to knight as it would not be able to exit h8. Since the promotion on h8 occurs after [BPa7] and [BPh7] have completed their captures, the promoted piece is captured by BPd7xc6. Prior to the capture by [BPd7], [BBc8] was locked at c8 and [BPe7] had not advanced to e6 (where it would obstruct the subsequent exit of [BBc8]) so [BBf8] is also locked at home and therefore, when the promoted piece is captured on c6, BQ and BK stand locked in the Central cage.
Looking backward: The above shows that WPa4 and WPg6 cannot retreat before the uncapture BPh6xBg5 which occurs after the unpromotion on h8 and retreat of the unpromoted WP to h5. Immediate Retro-stalemate can be prevented by retracting -1.WPf6xBe7? Bf8-e7 -2.Pf5-f6 Pe7-e6 -3.Ne6-d8 and a knight can provide the shield on d1 extracting BQ via e1 to unravel the South-East cage but with BB locked on f8 and WP standing on g6 (unable to retreat to g5 until the retreat of WP unpromoted from piece uncaptured on c6 allows BPh6xBg5) the BK cannot exit the North-East cage to retract to e8 allowing the uncapture on c6. Therefore the retraction sequence presented by Henrik above is the only way to release WNd8 in time to prevent retro-stalemate when WPe7 retracts back to f2. Standing on f2 the WP prevents a retro-shield by the knights on d1 so BK comes to the rescue.
A lovely "Solver's problem" (see comment by Tom Volet to P1347268). The #1 stipulation is a throw-back to earlier times. A modern replacement could be "Last 12 single moves". (2018-5-4)
comment
Keywords: Whose move?
Genre: Retro
Input: Gerd Wilts, 1996-9-17
Last update: Mario Richter, 2018-5-5 more...
42 - P0008560
Unto Heinonen
Springaren 1996
P0008560
(16+6)
ser-BP in 53
1. f4 2. f5 3. f6 4. fxg7 5. gxh8=T 6. Txh7 7. Th4 8. Tb4 9. h4 10. h5 11. h6 12. h7 13. hxg8=L 14. Lh7 15. Le4 16. Lc6 17. e4 18. Ke2 19. Kd3 20. Kc4 21. Kb5 22. Lc4 23. Se2 24. Dg1 25. Dxa7 26. Dxa8 27. Da3 28. Dc3 29. a4 30. a5 31. a6 32. a7 33. a8=S 34. Sb6 35. Sxc8 36. Sxe7 37. Sf5 38. Sd4 39. Sb3 40. d4 41. Lg5 42. Lxd8 43. Lxc7 44. Kb6 45. Ka7 46. Ka8 47. Ta7 48. Sa3 49. Ta1 50. Ta2 51. Sa1 52. b3 53. Db2
play all play one stop play next play all
paul: See P1007350 (2011-7-3)
paul: The first 28 moves checked by Jacobi(~2.5 hours) (2018-4-24)
more ...
comment
Keywords: Unique Proof Game, Length Record, Series mover
Genre: Retro, Fairies
Input: Gerd Wilts, 1997-1-9
Last update: A.Buchanan, 2018-4-24 more...
43 - P0008584
Bernd Schwarzkopf
6020 Die Schwalbe 107 10/1987
P0008584
(1+0) cooked
Ergänze sK und 5wSS zu einem IC!
a) AL: +sKe7, wSf6f7g8h6h7
b) NL: +sKb6, wSa7a8b3b7b8
play all play one stop play next play all
Schon 1998 fanden die Brüder Ulrich und Roland Voigt die NL: wSa7a8b3b7b8 - sKb6, die auch diagonal gespiegelt und in anderen Ecken möglich ist.
Cook: +wSa7a8b3b7b8+sKb6
Bernd Schwarzkopf: Schon 1998 fanden die Brüder Ulrich und Roland Voigt die NL: wSa7a8b3b7b8 - sKb6, die auch diagonal gespiegelt und in anderen Ecken möglich ist. (2018-6-11)
Henrik Juel: In the intended solution the check is clearly impossible
In the cook the check seems to be explained by -1.Sc7xa8+, but then Black has no preceeding move available, because all empty squares around Kb6 are covered by two white knights, and a possible uncapture on a8 does not help (2018-6-11)
comment
Keywords: Illegal cluster, only Kings, Symmetrical position, Asymmetrical solution
Genre: Retro
Reprints: (V) Problemkiste 109 02/1997
H39 ASymmetrie 2013
Input: Gerd Wilts, 1997-2-22
Last update: Alfred Pfeiffer, 2018-6-13 more...
44 - 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
play all play one stop play next play all
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)
comment
Keywords: Unique Proof Game, Pronkin Theme (l)
Genre: Retro
Input: Gerd Wilts, 1999-2-27
Last update: Mario Richter, 2018-3-21 more...
45 - P0500144
Karl Hasenzahl
1335 Die Schwalbe 20 08/1963
2. ehrende Erwähnung
P0500144
(5+5) C+
h#2
2.1...
1) 1. Tae5 Kg8 2. Ke8 La4#
2) 1. The5 Kg6 2. Ke6 Lf5#
play all play one stop play next play all
more ...
comment
Keywords: Fesselungsspiel (222 202 000)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Gerd Wilts, 1996-6-6
Last update: Alfred Pfeiffer, 2018-2-26 more...
46 - P0500741
Jacques Rotenberg
Jean-Marc Loustau

Ideal-Mate Review 1986
Preis
P0500741
(2+7) C+
h#6
1. Lh7 Kb2 2. Sg6 Kc3 3. Dg4 Kxd3 4. Sf4+ Kc4 5. Le4 Kc5 6. Df5 d4#
play all play one stop play next play all
Jacques Rotenberg: .
also switchback of the knight f4 (2018-3-12)
comment
Keywords: Hilfsmatt-Inder (ls), Interchange (dl (2)), Round Trip (s), tempo play (K), Switchback (s)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 172 Ideal-Mate Encyclopedia Vol.1 1999
diagrammes , p. 3416, 10-12/1999
Input: Gerd Wilts, 1996-6-6
Last update: Alfred Pfeiffer, 2018-3-15 more...
47 - P0500988
Hans Peter Rehm
Deutsche Schachblätter 1964
1. Preis
P0500988
(4+14) C+
#7
1. Ke3! droht 2. Scd2#
1. ... Te7+ 2. Kxd3 Sb4+ 3. Kd2! droht 4. Sa3#
3. ... Ta7 4. Sba5 Txa5 5. La4 Txa4 6. Kd1 ... 7. Sd2#
play all play one stop play next play all
Sally: Nach:
1. Ke3!; 2. Kxd3; 3. Kd2 - Ta7, hat Weiß durch die Königszüge den Sc6 nach b4 gelenkt und dadurch die Linie a4 - c4 unterbrochen, so dass jetzt der Hauptplan ablaufen kann, der in einem schönen Opferminimal endet.
Das ganze ist eine groß angelegte Beschäftigungslenkung, um die Masse. des wLd1 loszuwerden.
167 Beispiele zur Ideengeschichte Breuer 1982. (2017-3-24)
Henrik Juel: for clarity: 1... Te7+ with check
Other defenses allow shorter mate, e.g.,
3... Te2+? 4.Lxe2 Sc2 5.Ld1,Ld3 and #6
C+ by Popeye 4.61 (2017-3-24)
Sally: 1. Sba5?- Txa5!,
2. La4 - Txa4,
3. Kd1 [Sd2#] - Txc4!
1. Ke3! [2. Scd2#] Lepuschütz-Thema - Te7+
2. Kxd3 - Sb4+,
3. Kd2! [4. Sa3#] - Tat, usw. (2018-6-19)
comment
Keywords: Beschäftigungslenkung, Lepuschütz theme, Pure Round Trip (K), Opferminimal
Genre: n#
Computer test: Popeye 4.61
Reprints: 167 Beispiele zur Ideengeschichte des Schachproblems 1982
Input: Gerd Wilts, 1996-6-6
Last update: Alfred Pfeiffer, 2018-6-19 more...
48 - P0501003
Thomas R. Dawson
2525 Bolton Football Field 26/12/1914
P0501003
(1+5) C+
s#11
Schachzickzack
1. Kh4 Te4+ 2. Kh5 Th4,Te5+ 3. Kg6 Tg4,Th6,Tg5+ 4. Kf7 Tg7,Th7+ 5. Ke8 Tg8,Th8+ 6. Kd7 Td8+ 7. Ke6 Td6+ 8. Kf5 e6+ 9. Kf4 e5+ 10. Kg4 f5+ 11. Kh3 Th6#
play all play one stop play next play all
paul: Verified with WinChloe. (2018-5-6)
comment
Keywords: Checking Zigzag, Pure Round Trip, Rex solus (w)
Genre: Fairies
Computer test: WinChloe
Reprints: 87 Caissa's Fairy Tales 1947
220 diagrammes special 04/1991
Input: Gerd Wilts, 1996-6-6
Last update: Alfred Pfeiffer, 2018-5-7 more...
49 - P0501351
Felix Alexander Sonnenfeld
Jose Miguel Dias Figueiredo

Bolletino Circ. Scacch. Bolognese 1966
Lob
P0501351
(3+5)
h#3
b) sDh7 nach f5
a) 1. f5 Ld8 2. Db7 Sf6 3. Df3 Lc7#
b) 1. Dg5 Kc4 2. Kf5 Kd5 3. Df4 Se7#
play all play one stop play next play all
klären
Lösung: a) kein Matt
Viktoras Paliulionis: Cooks in b):
1.Qg5 Bg3+ 2.Kf5 Kd5 3.f6 Se7#
1.Qe6 Kd3 2.Ke5 Se7 3.f6 Bg3# etc. (2018-4-24)
Adrian Storisteanu: Typo in solution a), there is a mate after 3...Sh5#. (2018-4-24)
comment
Keywords: Interchange (kd (1)), tempo play (K)
Genre: h#
Input: hpr, 1996-7-1
Last update: hpr, 1999-5-22 more...
50 - P0503551
Jacques Rotenberg
Jean-Marc Loustau

245 Ideal-Mate Review 11/1983
P0503551
(3+3) C+
h#5
1. Sh3 Kh7 2. Kf7 Kh8 3. Kg6 Kg8 4. Kh5 Kg7 5. Sg5 g4#
play all play one stop play next play all
Jacques Rotenberg: .
square of the white king (2017-9-29)
Jacques Rotenberg: see P1004616 (2018-3-13)
comment
Keywords: Pure Round Trip (K)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 224 Ideal-Mate Encyclopedia Vol.1 1999
Input: Hans-Jürgen Schäfer, 1996-9-23
Last update: Alfred Pfeiffer, 2017-9-29 more...
51 - P0504315
Wladimir Naef
13806 Schweizerische Schachzeitung 10/1993
P0504315
(4+5) C+
h#3
3.1...
1) 1. Tg8 Le6 2. Tg2 Sd3+ 3. Kg3 Th3#
2) 1. Te8 Th3 2. Te4 Le6 3. Sg5 Sd3#
3) 1. Kg4 Sd3 2. Lf6 Th3 3. Lg5 Le6#
play all play one stop play next play all
WS- WL- WT
Sally: Weisser Zyklus mit nur 9 Steinen, in welchem die zuletzt blockende schwarze Figur der mattsetzenden weissen entspricht
Nr. 253 schachkunst.
(Eine Auswahl der schönsten Schweizer Schachaufgaben aus den
Jahren 1987 - 1996) (2018-5-24)
comment
Keywords: Cycle
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 253 schaCHkunst 2016
Input: Torsten Linss, 1996-10-9
Last update: Alfred Pfeiffer, 2018-5-24 more...
52 - P0505723
Hans Klüver
8883 Skakbladet 07/1970
P0505723
(4+3) C+
h#2
1. Lh8 La8 2. Kxa8 Txh8#
play all play one stop play next play all
LSp
Sally: [Zwei Läuferschlaghinführungslängstzüge]mit Kraftopfer auf a8. (2018-6-2)
more ...
comment
Keywords: Figurenspiel
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: E10) Problemkiste 171 06/2007
Input: hpr, 1996-12-29
Last update: Alfred Pfeiffer, 2018-6-2 more...
53 - P0506286
Jean-Marc Loustau
Jacques Rotenberg

2595 diagrammes 100 01-03/1992
Preis
P0506286
(4+10) C+
h#3
2.1...
1) 1. Df8 Lg8 2. Df7 Tf4+ 3. Kd5 Lxf7#
2) 1. Dg8 Tf8 2. Df7 Ld5+ 3. Kf5 Txf7#
play all play one stop play next play all
Jacques Rotenberg: .
critical moves
Maslar
Diagonal/orthogonal echo
model mates (2018-3-13)
comment
Keywords: Switchback
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: (P1) Springaren 73, p. 75, 05/1998
E121 FIDE Album 1992-1994 2001
Input: Markus Manhart, 1997-1-6
Last update: Marcin Banaszek, 2018-6-19 more...
54 - P0507923
Joao Baptista Santiago
5207 The Fairy Chess Review 18 06/1942
P0507923
(6+2) C+
h#2***
* 1. ... d8=S 2. e5 Se6#
* 1. ... d8=D 2. Ke5 Dd6#
* 1. ... f7 2. e5 f8=D,T#
1. Ke5 d8=S 2. Kd4 Sc6#
play all play one stop play next play all
Cook: geduldete Duale
t/Minimal-b, t/Allumwandlung, u/61102, u/DST-S
Alfred Pfeiffer: Keine L-Umwandlung, daher keine Allumwandlung. (2018-5-8)
comment
Keywords: Promotion (SDT), under-promotion
Genre: h#
Computer test: Popeye 3.44 Andernach (1024 KB)
Input: Erich Bartel, 1997-5-23
Last update: Alfred Pfeiffer, 2018-5-8 more...
55 - P0509711
Hans Klüver
10188 Skakbladet 06/1979
P0509711
(3+3) C+
h#5
1. Sc7 Le8 2. Kf5 La4 3. Ke6 b5 4. Kd7 b6+ 5. Kd8 bxc7#
play all play one stop play next play all
more ...
comment
Keywords: Check Protection
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 47 Hans Klüver. Ein Schachporträt 1988
Input: Markus Manhart, 1997-6-28
Last update: Alfred Pfeiffer, 2018-6-2 more...
56 - P0510561
Mannis Charosh
156 British Chess Magazine 11/1956
P0510561
(3+6) cooked
h#3
b) -sLg3
a) 1. Kf6 Sd5+ 2. Kg5 Sf6+ 3. Kh4 Txh5#
b) 1. Td5 Ta5 2. Td7 Sd5+ 3. Kd8 Ta8#
play all play one stop play next play all
Cook: NL
a) 1. Kd7 Td5+ 2. Kc6 Sd3 3. Lc7 Sb4#
1. Kd6 Td5+ 2. Kc6 Sg6 3. Lc7 Se7#
milan: bBg3=bP h#3 2.1...M.Frelih (2018-3-5)
comment
Keywords: Check Protection
Genre: h#
Input: Markus Manhart, 1997-6-28
Last update: Alfred Pfeiffer, 2018-3-5 more...
57 - P0515350
Edgar D. Holladay
184 Ideal-Mate Review 09-10/1983
P0515350
(3+2) C+
h#3
2.1...
1) 1. Ld3 Ka2 2. Ka4 Sc6 3. Lb5 b3#
2) 1. Ka5 Kc4 2. Lc2 Kc5 3. La4 b4#
play all play one stop play next play all
Sally: Verführung:
1. Kc5?- Ka4,
2. La2 - Ka5,
3. Lc4 - Bb4,
4. Kd.. !!
durch Ausnutzung der zwei Zugmöglichkeiten des Bauern entstehen zwei überraschend unterschiedliche Idealmatts mit Blocknutzung. (2018-6-13)
comment
Keywords: Symmetrical position, Oneliner, Ideal mate, Asymmetrical solution
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 3496 Ideal-Mate Encyclopedia Vol.2 2000
E60 ASymmetrie 2013
Input: Hans-Jürgen Schäfer, 1997-9-1
Last update: Alfred Pfeiffer, 2017-9-27 more...
58 - P0516136
Hans Klüver
11697 Skakbladet 08/1988
P0516136
(4+4) C+
h#3
1. g4 Lxg4 2. e5 Sf5 3. 0-0-0 Sd6#
play all play one stop play next play all
Verstellung ScL
nach Julius Keller
more ...
comment
Keywords: Castling (sg), tempo play (b), Verstellung
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Reprints: 57 Hans Klüver. Ein Schachporträt 1988
Input: Andreas Mokosch, 1997-7-25
Last update: Alfred Pfeiffer, 2018-6-2 more...
59 - P0522841
Jacques Rotenberg
569v diagrammes 05-06/1978
P0522841
(4+7) C+
h#2*
* 1. ... Lc2 2. Sa5 Tb8#
* 1. ... Lc2 2. Sb8 Txb8#
1. Sb4 Lc2 2. Sa2 Tb8#
play all play one stop play next play all
klären Dual intendiert??
Jacques Rotenberg: .
black has 37 theoretical double step for the knight c6, only one works.
On the diagram the knight has a complete possible wheel and also after 1.Sd4? - with 4 kinds of negative effects a. control of the 8th rank, b. closing of the rook, c. closing/capture of the bishop, d. check to the king (2018-3-13)
comment
Keywords: tempo play (ss)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Markus Manhart, 1998-2-10
Last update: Alfred Pfeiffer, 2018-3-14 more...
60 - P0523479
Bernhard Schauer
12771 Schweizerische Schachzeitung 04/1986
P0523479
(5+4) C+
h#2
2.1...
1) 1. Da3 Te5 2. De3 Txf5#
2) 1. Dg7 Lf6 2. Dg5 Le5#
play all play one stop play next play all
Sally: 1. Dg7! - Lf6, 2. Dg5 - Le5#. (Dg5?).
1. Da3! - Te5, 2. De3 - Txg5#.(De3?).
Zweimal Vermeidung von schwarz/weißer Verbahnung.
Hier fehlt ein Mustermatt. (2018-6-15)
comment
Keywords: tempo play (d d)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Markus Manhart, 1998-2-10
Last update: Alfred Pfeiffer, 2018-6-16 more...
61 - P0523521
Bernhard Schauer
11959 Schweizerische Schachzeitung 02/1981
P0523521
(6+6) C+
h#2
2.1...
1) 1. Lxd6 Sf4 2. Le5 Sg3#
2) 1. Le5 Lf4 2. Lxd6 Sxd6#
play all play one stop play next play all
Sally: Hübsche Tempoverlustmotivation der Schlüsselzüge.
Schwarz muss seine Zugmöglichkeiten sehr genau dosieren. (2018-6-15)
comment
Keywords: tempo play (l l)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Markus Manhart, 1998-2-10
Last update: Alfred Pfeiffer, 2018-6-16 more...
62 - P0525133
Jan Ingvar Hannelius
13010 Tidskrift för Schack 06-07/1972
P0525133
(4+4) C+
h#2
2.1...
1) 1. f2+ Kxf2 2. 0-0 Tag1#
2) 1. Tg8 0-0-0 2. Tf8 The1#
play all play one stop play next play all
VL: Only one w castling is legal. Therefore presently (since 2009), due to Art.16 (3) of the Codex, this diagram, as is, represents a retro-problem (PRA) with NO SOLUTION if O-O-O is illegal. The genre and the soundness can be recovered by a shift of wPa2. (2017-11-26)
VL: Continuation. In reality, the second part of Art.16(3) formally preserves the soundness of problems like this one (without any changes in their positions): namely, in the framework of Retro-Strategy (RS), which justifies the choice of appropriate castling as a part of the solution! However, such a subtle retro-enrichment lies, apparently, beyond the original intention. (2017-12-1)
A.Buchanan: This is not a PRA problem, since it has no solution if 0-0-0 is illegal. Therefore it is RS as it always has been. The "retro-enrichment" that Valery refers to is I think the additional verification that the problem is not PRA. Not sure what he means by saying "the genre and the soundness can be recovered by a shift of wPa2". (2018-3-25)
VL: Yes, Andrew, I confused b O-O with w one (specifically in this problem among numerous similar ones)... But anyway, the sound version of this problem with, say. wP on a3 removes, apparently unintentional, retro-content. See more arguments and details in my comments to P0527781. (2018-3-29)
A.Buchanan: You write "the sound version of this problem". But it *is* sound. (2018-3-29)
comment
Keywords: Echo, Castling (wgsk), Homebase (w)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Markus Manhart, 1998-2-16
Last update: A.Buchanan, 2018-3-29 more...
63 - P0526627
Andrey Dikusarov
1162 Gazeta Czestochowska 22/12/1970
P0526627
(4+7) cooked
h#2
b) sBe7 nach g7
c) sBc7 nach g7
a) 1. Lg7 Tg2 2. Lf8 Tg8#
b) 1. Lf6 Te2 2. Ld8 Te8#
c) 1. Le5 Tc2 2. Lb8 Txc8#
play all play one stop play next play all
Cook: NL:
c) 1. Tc4 Le6 2. Tg8 hxg8=D#
Ladislav Packa: +bPf7, wBf5-d3, C+ by Popeye v4.77 (2018-4-19)
comment
Keywords: Fesselungsspiel (313 000 330)
Genre: h#
Input: Markus Manhart, 1998-3-1
Last update: Marcin Banaszek, 2015-12-1 more...
64 - P0526899
Vaclav Gebelt
Stepan P. Tsyrulik

Leninskaja Smena 06/03/1966
2. Preis
P0526899
(4+11) cooked
h#2
b) -sSh5
c) -wSg2
a) 1. Te2 De6 2. Sg3 Sh4#
b) 1. Kg4 Sd4 2. h5 Dg8#
c) 1. Lf1 Sd6 2. Ke3 Dxe4#
play all play one stop play next play all
Cook: NL:
a) 1. Td1 Se3 2. Ke2 Dxd1#
b) 1. Ke2 Se3 2. Tb2 Dd1#
Ladislav Packa: +bPc2 C+ by Popeye v4.77 (2018-6-16)
comment
Keywords: Fesselungsspiel (326 000 660)
Genre: h#
Input: Markus Manhart, 1998-3-1
Last update: Alfred Pfeiffer, 2018-6-16 more...
65 - P0527781
Fadil Abdurahmanovic
4664 feenschach 76 08/11/1985
In memoriam Albert H. Kniest
2. Preis
P0527781
(3+13) C+
h#3
2.1...
1) 1. Tc5 0-0 2. Dd7 Tf4 3. exf4 Te1#
2) 1. Lc5 0-0-0 2. Td7 Td4 3. exd4 Te1#
play all play one stop play next play all
VL: Only one castling is legal. Therefore presently (since 2009), due to Art.16 (3) of the Codex, this diagram, as is, represents a sound retro-problem (PRA) with one solution consisting of two partial ones.
Reprints: (13) StrateGems SG19, p.158, 07/2002 (2017-11-25)
Henrik Juel: ... so you might replace
'1)' by 'If Ta1 made last move', and
'2)' by 'If Th1 made last move'
If a skeptic asks: What if Ke1 made last move?
the answer is a reference to the ancient convention that a castling is considered legal unless it can be shown that it is illegal (2017-11-25)
A.Buchanan: A problem comprises diagram and stipulation. The stipulation says 2 solutions, so the problem is unsound under PRA, which would just have a single solution with two parts.
The convention says: "If...a solution is not possible according to the PRA convention..." Was this intended to mean here "if it's not possible to find a single h#3" or to mean: "if is not possible to resolve the problem including stipulation" i.e. to find *two* h#3. I assume the latter.
However if the stipulation had asked: "How many solutions?" then it would have altered from being RS to being PRA. I don't think this would be an issue, because the chess here would work the same way. (2018-3-25)
A.Buchanan: Arts 2 & 3 say: "A chess composition consists usually of a position on the chess board, a stipulation in the form of words and the solution, which usually consists of one or more sequences of moves which satisfy the stipulation." So the Codex appears to be using "solution" in the broader usage, which is consistent with the latter interpretation. (2018-3-25)
Yoav Ben-Zvi: As I understand it PRA means the solution is a "Strategy" (in the sense borrowed from Mathematical Game Theory) that contains a valid solution for every possible game that leads to the stated position. In plain language: when the game score is revealed the solver has a solution ready for it no matter which game score it is. If this is correct then there is no PRA solution because there is no solution in case White has lost both castling rights, which is a valid possibility. The fact that there is no circumstance in which White retains both castling rights means there is no case with a double solution but it does not change the fact that this problem has "No Solution".
I seem to be the only one to see it this way which makes it likely that there is something wrong in the above reasoning. I dont think Henrik's reply to the "Skeptic" points to such a flaw. (2018-3-26)
A.Buchanan: Here's how PRA was taught me in 2000 by composer, mountain climber and wonderful human being, Ronald Turnbull.
To understand the interaction of any castling and en passant rights, consider in turn each subset of the set of these variable moves Suppose this is the set of permissible moves. Is it consistent with the full application of the castling and en passant conventions? If no, we discard it; if yes we keep it and call it a 'part'. The problem divides into these independent parts, each to be solved separately.”
So e.g. here, S={wQc,wKc}. S itself cannot be the set of permitted moves, because at least one of the castlings must be impossible. {wQc} is maximally consistent, because you can't add {wKc}, although the castling convention tries to. So this is a "part". Similarly {wKc} is a "part". But the empty set {} is *not* a part, since you can add either {wKc} or {wQc}, without becoming inconsistent.
So there are two parts: {wQc} & {wKc}.
Please tell me if this makes sense, or how you would improve it. (2018-3-26)
VL: This problem is originally merely a helpmate with no retro: its hidden retro-content could be and was ignored. On the contrary, some problems with similar incompatible w castlings, stipulated appropriately (e.g., P0007077 by W.Keym) are retro-problems of the PRA-genre (PRA of a specific kind, sometimes called Typ Keym or Ad Libitum...). But the problems of this sort have never been considered previously (before Piran-58, after Piran and after Imola-73) as retro-strategic: that time, RS was formulated and understood more restrictedly (here I only can refer to
numerous available old articles devoted to RS or to RS vs PRA, etc.). Restipulated "one solution, pRA" (the corresponding version of) this problem would have become a sound retro-problem with the same but reinterpreted solution. See more details and similar examples in my
article "Retrovariants in helpmates with two white castlings" (StrateGems, 2002, SG19). Further, Art.16 adopted in Jurmala in 2007 made this problem, and similar ones, unsound. I was the first to revealed this unexpected
negative consequence, and I suggested a way (that has other, more important, advantages) to return their soundness, this time as RS-problems. It has been successfully implemented in the current wording of Art.16(3) (the main ordering idea goes back to my article "An order in controversial retro-genres", Shakhm. Kompoz., 1993, No.6, (in Russian)). Thus, we've luckily restored the soundness and enriched the content of such problems by
a retro-strategic scenario. However, instead, as before, one could restipulate "one solution" (already without the mark "pRA"), what, again, made this problem a sound retro-problem but now of the PRA-genre. (Here as always in such contexts, "this problem" is meant in the broad sense: it
literally or an appropriate version/variation of it.) There is a third competitive ways to leave this problem sound; namely, by adding a technical wP that could made the last move: such a version would preserve both the initial genre (purely helpmate) and the solution. In my opinion, all these options make sense although I myself prefer the first, newest and fortunate, retro-strategic one. (2018-3-29)
A.Buchanan: If we stick to the current conventions (1) this problem works fine as RS, or (2) we could change the stipulation to make it fit PRA (but why bother), or (3) we could change the diagram to make these retro concerns go away (again why bother). I view Keym's convention as a modus vivendi: to allow RS & PRA problems to appear without special stipulation (the price being paid by newcomers who aren't aware of what's going on). If the stipulation asked: "how many solutions?" then I agree that the problem would be both PRA & RS, and we would have to choose one. Keym's convention protects problems from conventions. (2018-3-29)
comment
Keywords: Sacrifice of white pieces, Reihen-Echo, Castling (wkwg)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Reprints: 809 FIDE Album 1983-1985 1992
(13) StrateGems SG19, p. 158, 07/2002
Input: Hans-Jürgen Schäfer, 1998-3-11
Last update: Alfred Pfeiffer, 2017-11-26 more...
66 - P0527881
Toma Garai
1022 Schach-Aktiv 10/1988
1. ehrende Erwähnung
P0527881
(4+9) C+
h#3
2.1...
1) 1. g1=L Txc7 2. Lxc7 Ld1 3. Lh2 Lf3#
2) 1. e2 Ld1 2. exd1=T Txc7 3. Tg1 Th7#
play all play one stop play next play all
Sally: Weiße Figur für schwarzes Tempo! Beeindruckender Zug- und
Rollentausch der weißen Figuren. Wechselseitige Akzentuierung
alltäglicher Heranhol-Werte, mit schwarzer Unterverwandlung. (2018-5-31)
comment
Keywords: Sacrifice of white pieces
Genre: h#
Computer test: Popeye C-Version 3. 47 (1024 KB)
Input: Hans-Jürgen Schäfer, 1998-3-11
Last update: Alfred Pfeiffer, 2018-5-31 more...
67 - P0527883
Andrey J. Lobusov
45 Scacco! 05/1987
P0527883
(7+6) C+
h#2
2.1...
1) 1. Dxg1 Se4 2. De3 Sb6#
2) 1. Dxd8 Se5 2. Dd5 Sd1#
play all play one stop play next play all
siehe P0527949
Harry Fougiaxis: Anticipated by Jozsef Korponai, 1428 Europe Echecs 05/1969 (P0527949) (2005-1-24)
Gunter Jordan: siehe auch P1347356 (2018-2-28)
comment
Keywords: Sacrifice of white pieces
Genre: h#
Computer test: Popeye C-Version 3. 47 (1024 KB)
Input: Hans-Jürgen Schäfer, 1998-3-11
Last update: Alfred Pfeiffer, 2018-3-1 more...
68 - P0532626
Claude Goumondy
404 Levelezesi Sakkhirado 01/1984
P0532626
(8+10) cooked
h#2
b) wKd1 nach h7
c) wSd6 nach g2
a) 1. b4 Kxd2 2. Ld5 c3#
b) 1. Sf2 Th3 2. Txe5 Td3#
c) 1. Dxe5 Sf4 2. De4 Se2#
play all play one stop play next play all
Cook: NL:
a) 1. Kd5 Txc4 2. Te2 Txc5#
und 1. Ld8 Kxd2 2. Dd5 c3#
b) 1. Kd5 Txc4 2. Te1 Txc5#
c) 1. Se4 Sf4 2. Dd5 Se2#
Ladislav Packa: +bPb6, e6=bR, C+ by Popeye v4.77 (2018-6-16)
comment
Keywords: Fesselungsspiel (224 202 202)
Genre: h#
Input: Markus Manhart, 1998-3-28
Last update: Alfred Pfeiffer, 2018-6-16 more...
69 - P0534164
Herman Menkis
1423 Ideal-Mate Review 09-10/1985
P0534164
(3+2) C+
h#3
1.1.2.1...
1) 1. Kxb3 0-0-0 2. Ka2 Td4 3. Ka1 Txa4#
2) 1. Kxb3 0-0-0 2. Ka3 Kc2 3. Tb4 Ta1#
play all play one stop play next play all
Jakob Leck: vorweggenommen durch P0544866 (2018-4-2)
comment
Keywords: Castling (wgwg)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Andreas Mokosch, 1997-10-16
Last update: Alfred Pfeiffer, 2018-4-3 more...
70 - P0534166
Hilmar Ebert
stern 06/05/1982
P0534166
(3+4) C+
h#3
b) sLb5 statt sSb5
a) 1. Kd4 0-0-0+ 2. Kc3 Te1 3. Sd4 Te3#
b) 1. Kb6 0-0-0 2. Ka5 Kc2 3. Ka4 Ta1#
play all play one stop play next play all
Jakob Leck: Bg3 überflüssig (2018-4-2)
Henrik Juel: Bg3 is needed to preserve the castling right, as last move could be fxg3, f2-f3, or hxg3 (2018-4-3)
comment
Keywords: Castling (wgwg), Forsberg twin
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Andreas Mokosch, 1997-10-16
Last update: Alfred Pfeiffer, 2018-4-3 more...
71 - P0534189
Julius Dohrn-Lüttgens
829 FEENSCHACH 09/1951
P0534189
(11+6) C+
h#4
3.1...
1) 1. Th4 0-0-0 2. Txh2 Tdg1 3. Txg2 Txh7 4. Th2 Txg8#
2) 1. Ta4 0-0 2. Txa2 Tfb1 3. Txb2 Txa7 4. Ta2 Txb8#
3) 1. Kf8 0-0 2. Txe2 Tae1 3. Txf2 Te7 4. Tf7 Tfxf7#
play all play one stop play next play all
VL: Only one castling is legal. Therefore presently (since Rio-2009), due to Art.16 (3) of the Codex, this diagram represents a retroproblem. However, it is unsound either as a PRA- or (instead) as an RS-problem (the 1st and the 2nd parts of the Article, resp.) because of unequal numbers of solutions for both castlings. Moreover, unlike other numerous helpmates with incompatible white castlings (cf., e.g., P0527781 and P0525133), I see no way to restore the soundness of this impressive problem in the modern framework (since all 8 w pawns are present and no one can be shifted). (2018-3-25)
A.Buchanan: Hi Valery: I was thinking that if anyone can find a problem which was broken by Rio, it is probably you. But I am baffled by what you write here. This was and is a pure RS problem. It is certainly unsound as a PRA problem, therefore post-Rio RS still applies. RS doesn't care about the number of castlings of each side: it just says: is this castling legal given the known history? If yes, then do it. So all 3 candidate solutions are permitted, because in none of them does White castle twice! If somehow you still have an issue, please explain in greater detail. (2018-3-25)
VL: Sorry, I wasn't right above (misrepresenting my old analysis!): of course this is currently a sound retro-problem of the RS-type. It, and other related helpmates, have never been considered previously as retro-strategic; on the contrary, they were considered as capable to be restipulated into sound PRA-problems. This problem played a role in improvements introduced into the Codex in Rio de Janeiro. In our correspondence with Werner Keym in 2008
about drawbacks of Jurmala's version of Art.16 I indicated just to this problem as one which was made hopelessly unsound but, luckily, becomes sound again under the new "ordered" wording of this rule (Rio-09). This is a new interpretation (a by-product of the current Art.16(3), in fact). Let me clarify the main peculiarity of this problem: unlike other helpmates with incompatible w castlings (see again P0527781 and my comments there) here we have no way to preserve its initial genre, namely, "helpmate" WITHOUT anything more. To preserve by constructing an appropriate version. No other options/versions. I'm not sure that the author would be happy to share our joy to see such a (forced) retro-enrichment of his helpmate due to the newest Codex.
By the way, as I indicated in 2002, there is a more economical version of this problem: both bPs are redundant! (2018-3-29)
more ...
comment
Keywords: Castling (wkwkwg)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: (18) StrateGems SG19, p. 159, 07/2002
Input: Andreas Mokosch, 1997-10-17
Last update: Alfred Pfeiffer, 2017-12-4 more...
72 - P0534387
Carl-Erik Späre
1266 The Problemist 07/1988
P0534387
(3+3) C+
h#3
b) sDb2 nach a3
a) 1. Dh8 0-0-0 2. Ka2 Td7 3. Ka1 Txa7#
b) 1. Df8 0-0-0 2. Ka3 Kc2 3. Db4 Ta1#
play all play one stop play next play all
Jakob Leck: Bh3 überflüssig (2018-4-2)
Henrik Juel: Bh3 is needed to preserve the castling right, as last move could be gxh3 or h2-h3 (2018-4-3)
comment
Keywords: Castling (wgwg)
Genre: h#
Computer test: (Popeye C-Version 3.52 (2048 KB))
Input: Andreas Mokosch, 1997-12-23
Last update: hpr, 1999-2-2 more...
73 - P0537948
Michel Caillaud
Jacques Rotenberg

Andernach 1991
5. Platz
Thematurnier
P0537948
(4+1) C+
h#2*
* 1. ... Sf6+ 2. Kh8 Lg7#
1. Kxg8 h7+ 2. Kxf8 h8=D#
play all play one stop play next play all
Jacques Rotenberg: The theme was : the pieces that are moving in the set are taken in the solution. (2018-3-13)
comment
Keywords: Rex solus (s)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Michal Dragoun, 1998-4-7
Last update: Alfred Pfeiffer, 2018-3-14 more...
74 - P0539450
Horst Böttger
8239 Die Schwalbe 1993
P0539450
(5+11) C+
h#2
b) sBe3 nach d4
a) 1. Le6 Kg2 2. Ke4 Lg6#
b) 1. Te6 Sc1+ 2. Kc4 Tc8#
play all play one stop play next play all
Sally: Linienöffnung mt doppelter Linienverstellung und s. Selbstfesselung, alles in Doppelsetung. Feine analoge Spiele
mit jeweiliger Dreifachnutzung des Schnittpunktes "e6". Ohne w. Bauern, aber auch der König spielt mit.
Eine bessere Stellung laut Preisrichter M.McDowell ist:
Kg1/Ta5/Te8/Lf7/Se2, wie gehabt; sKd3/Tb6/Th7/Lf5 Bb4,d4,e3,g5 (2018-6-9)
comment

Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Michal Dragoun, 1998-4-8
Last update: Alfred Pfeiffer, 2018-6-9 more...
75 - P0540034
Horst Böttger
13732 Schweizerische Schachzeitung 03/1993
P0540034
(6+9) C+
h#2
2.1...
1) 1. Sd5 Sg6 2. Kg4 Se5#
2) 1. Sd5 Se5+ 2. Kf4 Sg6#
play all play one stop play next play all
Sally: 1. Sbd5! - Sg6, 2. Kg4 - Se5#.
1. Scd5! - Se5+,2. Kf4 - Sg6#.
Diese simple Vertauschung der beiden weißen Springerzüge war sichtlich schon oft zu sehen. (2018-6-9)
comment

Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Michal Dragoun, 1998-4-8
Last update: Alfred Pfeiffer, 2018-6-9 more...
76 - P0541570
Michel Caillaud
Jean-Marc Loustau
Jacques Rotenberg

(1) feenschach 99, p. 2, 01-08/1991
P0541570
(3+4) C+
h#2*
* 1. ... Txh2+ 2. Kg1 Th1#
1. f1=L Tf2+ 2. Lg2 Tf1#
play all play one stop play next play all
Jacques Rotenberg: "closed sequence of Umnov" meaning that all the squares involved (f1, f2, g2) have the Umnov on it.
Exchange of places between pawn f2 and rook g2 before the mate (2018-3-13)
comment

Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Michal Dragoun, 1998-4-9
Last update: Alfred Pfeiffer, 2018-3-14 more...
77 - P0541805
Bernhard Schauer
11925 Schweizerische Schachzeitung 11/1980
P0541805
(4+8) C+
h#2
4.1...
1) 1. Lg3 Lxe2 2. Ld6 Lc4#
2) 1. Tc3 Tf6+ 2. Ke5 Lxc3#
3) 1. h3 Td7 2. h4 Lg4#
4) 1. Kd6 Te7 2. Ta3+ Lxa3#
play all play one stop play next play all
Sally: Das Mattbild a) passt nicht so recht ins (Echo-Modellmatt) -
Schema. Gute Häufung des an sich wohl bekannten T-L-L Matts. (2018-6-15)
comment
Keywords: Echo-Kombinationen
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Michal Dragoun, 1998-4-9
Last update: Alfred Pfeiffer, 2018-6-16 more...
78 - P0543042
Jacques Rotenberg
3076 Themes-64 07-09/1976
P0543042
(2+2) C+
h#5
1. Ke8 Sg5 2. Kf8 Kg4 3. Kg8 Kh5 4. Kh8 Kh6 5. Tg8 Sf7#
play all play one stop play next play all
more ...
comment
Keywords: Check Protection, Switchback (S), Aristocrat, Letter problem (T), Wartezug
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: hpr, 1998-4-19
Last update: Alfred Pfeiffer, 2018-3-15 more...
79 - P0544107
Horst Böttger
12101 Schweizerische Schachzeitung 12/1981
P0544107
(3+9) C+
h#2
b) wLh6 statt wTh6
a) 1. Sg2 Th3 2. Lb1 Sb4#
b) 1. Tg2 Lf8 2. Sb3 Sc3#
play all play one stop play next play all
Sally: Leicht verdauliche Aufgabe, wobei beiden Schlüsselzüge auf das gleiche Feld "g2" ziehen. (2018-6-9)
comment
Keywords: Fesselungsspiel (212 000 220), Forsberg twin
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Markus Manhart, 1998-4-17
Last update: Alfred Pfeiffer, 2018-6-9 more...
80 - P0547044
Jean-Marc Loustau
Jacques Rotenberg
Denis Blondel

Ramsgate 03/1988
1. Preis
P0547044
(7+16) C+
h#2
2.1...
1) 1. Sb4 Td5 2. Dd2 Lxd4#
2) 1. Sc7 Ld5 2. Df2 Lf4#
play all play one stop play next play all
Jacques Rotenberg: antidual Grimshaw (2018-3-13)
comment
Keywords: Fesselungsspiel (214 220 220)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Markus Manhart, 1998-5-4
Last update: Alfred Pfeiffer, 2018-3-14 more...
81 - P0547117
Jean-Marc Loustau
Jacques Rotenberg

114 Phénix 2 10/1988
2. Preis
P0547117
(11+10) C+
h#2
2.1...
1) 1. Sec3 Te4 2. Sb4 Sb2#
2) 1. Sxc5 Le4 2. Db4 Se5#
play all play one stop play next play all
Jacques Rotenberg: antidual Grimshaw, "cumul"-Somov mates (2018-3-13)
comment
Keywords: Fesselungsspiel (214 220 220)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Markus Manhart, 1998-5-4
Last update: Alfred Pfeiffer, 2018-3-14 more...
82 - P0548607
Markus Ott
Hans Peter Rehm

726 idee & form 50 04/1996
1. Preis
P0548607
(2+9) C+
h#6
1. Te3+ Kc2 2. Lc5 Kb2 3. d3 Kb3+ 4. Td4 Kc3 5. Td5 Kb2 6. Kd4 Kb3#
play all play one stop play next play all
Sally: Als Beispiel für den Rundlauf einer Figur, die eine Fläche umreißt. der w. König umrahmt mit seinen ersten 3 Zügen ein Dreieck. (dessen Flächeninhalt nach den üblichen thematischen Methoden berechnet werden kann)
Besonders beachtenswert ist : dass er mit seinen nächste 3
Zügen ein anderes Dreieck zeichnet. (2017-6-14)
Olaf Jenkner: 2007 erschien eine Neubearbeitung: P1077146 (2018-6-18)
comment
Keywords: Fesselungsspiel (113 101 202), Pure Round Trip (KK)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: (III) Die Schwalbe 187, p. 18, 02/2001
E225 FIDE Album 1995-1997 2004
Input: Thomas Maeder, 1998-5-27
Last update: Alfred Pfeiffer, 2018-6-7 more...
83 - P0548661
Wladimir Naef
875 idee & form 55 07/1997
P0548661
(7+6) C+
h#2
3.1...
1) 1. Sd4 Sc3+ 2. Kxc5 Sa4#
2) 1. Sxc5 Sf6+ 2. Kxd6 Se8#
3) 1. e6 Tg2 2. Kxd5 Td2#
play all play one stop play next play all
Sally: Dreimalige Umbildung bestehender Batterien.
Nr. 245 schachkunst
(Eine Auswahl der schönsten Scheizer Schachaufgaben 1997-2010) (2018-5-19)
comment

Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 245 schaCHkunst 2016
Input: Thomas Maeder, 1998-5-31
Last update: Alfred Pfeiffer, 2018-5-19 more...
84 - P0550344
Wladimir Naef
13007v Schweizerische Schachzeitung 11/1987
2. Preis
SSZ 1987
P0550344
(7+7) C+
h#3
0.4.1...
1) 1. ... Dxb7 2. Sc3 dxc3+ 3. Kxc5 Dxc6#
2) 1. ... Dc7 2. Se7 d3 3. Kd5 Dd6#
3) 1. ... Dxg8 2. Se3 dxe3+ 3. Ke5 De6#
4) 1. ... bxc6 2. Kxc5 d4+ 3. Kd6 Dd7#
play all play one stop play next play all
Sally: 2. Pr. SSZ. 1987.
Albino mit 4 verschiedenen Damenmatts.
"Les quarte mouvements du d2 (Albino) agrémentés d' èchos.
Une belle oeuvre" (Preirichter C. Goumondy)
Nr. 249 schachkunst.
(Eine Auswahl der schönsten Schweizer Schachaufgaben aus den
Jahren 1987 - 1996). (2018-5-24)
comment
Keywords: Echo-Kombinationen, Albino
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 249 schaCHkunst 2016
Input: Ronald Schäfer, 1998-2-1
Last update: Alfred Pfeiffer, 2018-5-24 more...
85 - P0551680
György Bakcsi
1068 Schach-Aktiv 02/1989
3. Preis
PR: L. Lindner
P0551680
(5+7) C+
h#2
b) +wTf2
a) 1. axb1=S Td1 2. Sd2 Txa1#
b) 1. Txb1+ Td1 2. exd1=S Txa2#
play all play one stop play next play all
Sally: 3. Pr. Schsch Aktiv 1989.
Echt Bakcsi! Meiner Auffassung nach die originellste Aufgabe des Jahres, wenn auch nicht, so anspruchsvoll wie der erste
und zweite Preisträger. Fie Zugabe des w. Turms stellt alles auf den Kopf, die Lösungsabläufe mit den Vernichtungen weißer
Kraft und den Unterverwandlungen bilden doch eine kustvolle Einheit.
(Preisrichter L. Lindner) (2018-5-31)
comment
Keywords: Sacrifice of white pieces, under-promotion (s), Umwandlung im Schlüsselzug
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Hans-Jürgen Schäfer, 1997-10-11
Last update: Alfred Pfeiffer, 2018-6-1 more...
86 - P0552140
Yosif Krikheli
12177 Schweizerische Schachzeitung 06/1982
P0552140
(4+7) C+
h#2
b) sBc7 nach d5
a) 1. Lxf6 d7 2. Kb6 dxc8=S#
b) 1. Lxd6+ Ka4 2. Lb8 Ta6#
play all play one stop play next play all
Sally: Kam bei den Lösern nicht gut an.
Merkwürdig ; Dürftig. Kein Zusammenhang zwischen den Lösungen.
Hier fehlt der unumgängliche Faden der Zwillingsbildung. (2018-6-14)
comment
Keywords: Sacrifice of white pieces, under-promotion (S), Umwandlung im Mattzug
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Hans-Jürgen Schäfer, 1998-1-20
Last update: Alfred Pfeiffer, 2018-6-15 more...
87 - P0552773
Hans Klüver
961 Die Welt 16/04/1971
P0552773
(6+4) C+
h#4
1. fxe1=S e6 2. Sf3 e7 3. e1=T e8=L 4. Te3 Lg6#
play all play one stop play next play all
Sally: Drei Unterverwandlungen. Verführungsreich.
33 Hans Klüver Ein Schachporträt (G. Murkisch 19988) (2018-6-2)
comment
Keywords: Sacrifice of white pieces, Promotion (stL), under-promotion, Umwandlung im Schlüsselzug
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 33 Hans Klüver. Ein Schachporträt 1988
Input: Hans-Jürgen Schäfer, 1998-7-1
Last update: Alfred Pfeiffer, 2018-6-2 more...
88 - P0553646
Marko Klasinc
818 feenschach 13 02/1973
P0553646
(5+9) C+
h#4
b) wBc3 nach d3
a) 1. e1=S Sd3 2. Td1+ Kxd1 3. b1=S Sxe1 4. b2 Sc2#
b) 1. e1=T Se2 2. Tbd1+ Kc3 3. b1=T Sd4 4. b2 Sc2#
play all play one stop play next play all
more ...
comment
Keywords: Reihen-Echo, konsekutive Umwandlungen 2 (ss,tt)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Hans-Jürgen Schäfer, 1998-8-4
Last update: Alfred Pfeiffer, 2018-5-19 more...
89 - P0554702
Hans Klüver
4047 Deutsche Schachzeitung 08/1979
P0554702
(5+7) C+
h#3
1. Ld3 Le8 2. Lc4 Lb5 3. Kd3 Txd5#
play all play one stop play next play all
Sally: Auf versteckte Weise führen der sL. und - mit herlinrtitischem
Zug - der wL. die durch den Zug des sK. dann effektiv werdende Fesselungsstellung herbei, die das Matt durch den Turm ermöglicht. Natürlich gibt es Vorstufen, doch war eine Darstellung mit herlin-kritischem Zug nicht festzustellen.
Dies war der Lösungstext der Dtz. Schachzeitung, XII/1979, lediglich "perikritisch" statt "herlinkritisch" hieß es dort.
Klüver hat sich stets dafür eingesetzt, dies weiterhin zu unterscheiden (im Sinne der Ausführungen in : Sidler,
Problemschach, 1968, Seite 82), doch hat sich "perikritisch" als allgemeiner Oberbegriff weitgehend durchgesetzt.
46 Hans Klüver Ein Schachporträt ( G. Murkisch 1988) (2018-6-2)
comment
Keywords: Fesselungsspiel (111 101 000)
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 46 Hans Klüver. Ein Schachporträt 1988
Input: Markus Manhart, 1998-6-10
Last update: Alfred Pfeiffer, 2018-6-2 more...
90 - P0555986
Bernhard Schauer
9521 Schweizerische Schachzeitung 06/1964
P0555986
(4+3) C+
h#2*
* 1. ... Lf4 2. Kf8 Lh6#
1. Lh5 Tf4 2. Kh6 Tf7#
play all play one stop play next play all
Sally: Nette Kleinigkeit. (2018-6-15)
comment

Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Markus Manhart, 1998-8-12
Last update: Alfred Pfeiffer, 2018-6-16 more...
91 - P0557113
Franz Pachl
12837 Schweizerische Schachzeitung 09/1986
P0557113
(4+8) C+
h#2
2.1...
1) 1. Da3 De2 2. Tb4 Sc5#
2) 1. Db5 Ke2 2. Lb4 Sb2#
play all play one stop play next play all
Sally: Schöne Analoge. Am Brettrand weiden zwei Rappen, friedlich und unbeteiligt.
(Ohne Sd8? ginge : 1. Kb5! - Df7, 2. Da4 - Db7#).
Zweimal Hinterstellung der weißen Dame hinter zwei Figuren.
Zwei reine Matts. (2018-6-10)
comment
Keywords: Pure mate (2x)
Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Franz Pachl, 1998-9-16
Last update: Alfred Pfeiffer, 2018-6-13 more...
92 - P0557118
Franz Pachl
Hans-Peter Reich

FIDE Tagung 1989
5. ehrende Erwähnung
Quick Composing Tourney
P0557118
(7+7) C+
h#2
b) -sLd7
a) 1. Te5 e4 2. Txd5 e5#
b) 1. Kd7 d6 2. Ke8 d7#
play all play one stop play next play all
Sally: TT Boumemouth 1989, 5. ehrende Erwähnung.
Ein veblüffendes Stück:
Einmal läuft ein Bauer dem Turm, ein anderes Mal dem König hinterher. War für einen Zweizüger nicht leicht zu lösen. (2018-6-10)
comment

Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Reprints: 14480 Schach , p. 81, 04/2000
Input: Franz Pachl, 1998-9-16
Last update: Alfred Pfeiffer, 2018-6-13 more...
93 - P0557136
Franz Pachl
13792 Schweizerische Schachzeitung 09/1993
P0557136
(4+9) C+
h#2
b) wKg1 nach c8
a) 1. Kc3 Te5 2. Tb4+ Te3#
b) 1. Ka5 Le5 2. Lb4+ Lc7#
play all play one stop play next play all
Sally: Super schön und schwierig zu lösen.
Gute Analogie mit den T/L - Zügen, nach dem gleichen Feld
"e5" bzw. "b4. (Funktionswechsel).
Die weite Grundlinie-zu Grundlinie-Versetzung, die bei Zwillingen nicht gern gesehen werden, rechtfertigt sich hier, weil der sK. sowohl eine w. Fesselung gegen eine neue auswechselt, wie auch eine s. Batterie gegen eine neue eingetauscht wird. (2018-6-10)
comment

Genre: h#
Computer test: Popeye C-Version 3.47 (1024 KB)
Input: Franz Pachl, 1998-9-16
Last update: Alfred Pfeiffer, 2018-6-13 more...
94 - P0559557
Gerd Rinder
32 Die Schwalbe 2, p. 34, 12/1969
P0559557
(10+9) C+
h#5
1. g5 c4 2. g4 c5 3. gxh3 c6 4. h2 cxb7 5. h1=S bxa8=S#
play all play one stop play next play all
Sally: Das 100 Dollar-Thema verlangt: Keine Umwandlugnsfiguren. Vier Umwandlungdfiguren sind aber hier vorhanden. (2018-6-14)
more ...
comment
Keywords: Promotion, Excelsior, black, Excelsior, white, 100 Dollar task (Variation), Non-standard material (1xwL, 2xsL), under-promotion (sS), Umwandlung im Mattzug
Genre: h#
Computer test: Popeye, with intelligent mode
Reprints: A65) Problemkiste 105 06/1996
100$/3 feenschach 153, p. 161, 10-12/2003
B Die Schwalbe 214, p. 177, 08/2005
1 Encyclopedia of Chess Problems , p. 13, 2012
Input: Hans-Jürgen Schäfer, 1999-1-1
Last update: Alfred Pfeiffer, 2018-6-15 more...
95 - P0559879
Bernhard Schauer
12801 Schweizerische Schachzeitung 06/1986
P0559879
(6+8) C+
h#2
2.1...
1) 1. Sxb3 Txb3 2. Tc4 e3#
2) 1. Dxf5 Lxf5 2. e5 Td3#
play all play one stop play next play all
Sally: 1. Df5! - Lxf5, 2. Be5 - Td3#. (Bexf5?).
1. Sxb3 - Txb3, 2. Tc4 - Be3#. (Txb3?)
Originelle Dualvermeidung. Beseitigung weisser Masse. um kritische weiße Züge zu ermöglichen. (2018-6-15)
comment

Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: hpr, 1999-2-18
Last update: Alfred Pfeiffer, 2018-6-16 more...
96 - P0563106
Jacques Rotenberg
278 Rex Multiplex 04-06/1984
P0563106
(2+4) C+
h#3
1.1.2.1...
1) 1. Sb6 a8=D+ 2. Tgg2 Da6 3. Th2 Df1#
2) 1. Sb6 a8=D+ 2. Tag2 Da3 3. Tg1 Dh3#
play all play one stop play next play all
Jacques Rotenberg: Wurzburg-Plachutta (2018-3-13)
comment
Keywords: Axis Echo, Promotion
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Markus Manhart, 1999-1-23
Last update: Alfred Pfeiffer, 2018-3-15 more...
97 - P0564566
Hans Klüver
842 Die Welt 31/01/1968
E. Zepler gewidmet
P0564566
(2+3) C+
h#7
0.1...
b) alles ein Feld nach links
a) 1. ... Kc2 2. f3 exf3 3. e3 f4 4. e2 f5 5. e1=T f6 6. Th1 f7 7. Th7 f8=D#
b) 1. ... d3 2. Kf7 dxe4 3. Ke6 e5 4. Kd5 e6 5. Kc4 e7 6. Kb3 e8=D 7. Ka2 Da4#
play all play one stop play next play all
Sally: In der Zwillingsfassung b), wechselt die Mattstellung in die gegenüberliegende Ecke hinüber.
20 Hans Klüver Ein Schachporträt (G. Murkisch 1988) (2018-6-2)
comment
Keywords: Excelsior, white (auto key), Promotion
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 20 Hans Klüver. Ein Schachporträt 1988
Input: Markus Manhart, 1999-2-22
Last update: Alfred Pfeiffer, 2018-6-2 more...
98 - P0565062
Geza Erdös
Magyar Sakkvilag 1946
P0565062
(2+3) C+
h#8
1. Kb6 Sg6 2. Kc5 Sxh4 3. Kd4 Kg2 4. Ke3 Kh3 5. Kf2 Sf5 6. Kg1 Kg3 7. Kh1 Kf2 8. Sh2 Sg3#
play all play one stop play next play all
Felber Volker: Nachläufer P0542834a (2003-1-14)
Erich Bartel: vom gleichen Autor auch als Urdruck 9090 FCR VI 1951 (2018-3-23)
comment
Keywords: Aristocrat
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 9089 The Fairy Chess Review 06/1950
505 Ideal-Mate Encyclopedia Vol.1 1999
Input: Markus Manhart, 1999-2-28
Last update: Alfred Pfeiffer, 2018-3-24 more...
99 - P0565120
Wladimir Naef
13745 Schweizerische Schachzeitung 04/1993
1. Preis
P0565120
(4+10) C+
h#3
Zeroposition
a) sTd6 statt wTd6
b) sLc8 statt wLc8
c) sSe1 statt wSe1
a) 1. Te6 Sf3 2. Ld6 Kxb6 3. Kd5 Lxb7#
b) 1. Le6 Td3 2. Ld5 Te3+ 3. Kd4 Sc2#
c) 1. Lc3 Te6+ 2. Kd4 Lxb7 3. Sd3 Te4#
play all play one stop play next play all
Sally: Ein ganz ungewöhnliches Stück - wohl weil der Autor keine der etablierten Hilfsmattgrößen ist. Die Zwillingsbildung ist nicht alles. Die verbleibenden w. Figuren wechseln zudem ihre Fuktionen (decken und mattsetzen), so dass ein vollständiger Zyklus entsteht. Auch wenn manche Richter anderer Meinung sind
Ein Stück kann durch löserische Schwierigkeiten nur gewinnen.
( Preisrichter T. Linß)
Eine Auswahl der schönsten Schweizer Schachaufgaben aus den Jahren 1987 - 1996. (2018-5-24)
comment
Keywords: Zeroposition
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: schaCHkunst 2016
Input: Markus Manhart, 1999-2-28
Last update: Alfred Pfeiffer, 2018-5-24 more...
100 - P0565418
Jacques Rotenberg
1180 diagrammes 09-10/1981
P0565418
(3+6) C+
h#2
2.1...
1) 1. Sc2 Dxg8 2. Te5 Dxc4#
2) 1. Sd2 Dxe8 2. Ld5 Dxe3#
play all play one stop play next play all
Jacques Rotenberg: diagonal/orthogonal echo. exchange of functions between 4 black pieces, focal queens (2018-3-13)
comment
Keywords: Echo
Genre: h#
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: hpr, 1999-3-10
Last update: Alfred Pfeiffer, 2018-3-15 more...
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