Die Schwalbe

89 problem(s) found in 3984 milliseconds (displaying 89 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND G='Retro']

1 - P0000050
Andriy Frolkin
(T) Die Schwalbe 102 12/1986
P0000050
(13+13)
Vor mindestens 50 Einzelzügen mußte rochiert werden!
R: 1. ... La2-b1 2. Dh7-g8 Lb1-a2 3. Kg8-h8 La2-b1 4. Kf7-g8 Lb1-a2 5. Ke8-f7 La2-b1 6. Kd8-e8 Lb1-a2 7. Kc7-d8 La2-b1 8. Kb6-c7 Lb1-a2 9. Kc5-b6 La2-b1 10. Kd4-c5 Lb1-a2 11. Ke4-d4 La2-b1 12. Kf3-e4 Lb1-a2 13. Kg4-f3 La2-b1 14. Kh3-g4 Lb1-a2 15. Kh2-h3 La2-b1 16. Kg1-h2 Lb1-a2 17. h2xTg3 Th3-g3 18. Dg8-h7 Th8-h3 19. Sg3-h1 h7xTg6 20. Tg5-g6 La2-b1 21. Ta5-g5 Lb1-a2 22. Ta2-a5 f5-f4 23. Tb2-a2 La2-b1 24. Tb1-b2 f6-f5 25. Tf1-b1 Lb1-a2 26. 0-0
play all play one stop play next play all
James Malcom: It seems to me that this masterful problem is cooked, because the final position is illegal?! (2020-11-07)
Henrik Juel: The animation does yield an illegal position (with wD enclosed on g8)
I believe that the retroplay is incorrect
It gives the uncastling earlier than stipulated (2020-11-07)
James Malcom: Yes, the retorplay is actually 49 moves, not 50-I based it on han's now hidden comment. However, without access to rhe relevant issue of Die Schwalbe-it is not on Vaclav's link page-I know not or can guess the true solution, but surely it is on the same as the current pseudo-try. (2020-11-08)
James Malcom: Wait-I think that the solution is that it must be Black to move first! Just figured this out after last comment. Lemme try out the retro animation. (2020-11-08)
James Malcom: And indeed it does work! Having Black move first later saves them from an illegal tempo move that encloses the White queen from an illegal cage drom which it can never escape. A very exquisite trap for any retro solver! (2020-11-08)
James Malcom: Lastly, here is a PG that may or may not be the shortest: 1. Nf3 c5 2. Ne5 Qb6 3. Nc3 Qb3 4. axb3 c4 5. Nd5 c3 6. Ra6 Nf6 7. Rd6 Ng4 8. Re6 Ne3 9. Nf4 Nxf1 10. Nh5 Ne3 11. Ng3 Nc4 12. bxc4 dxe6 13. Nf5 Bd7 14. Ng3 Ba4 15. Nf5 Bb3 16. Ng3 Ba2 17. Nf5 Nc6 18. Ng3 Na5 19. Nf5 Nb3 20. Ng3 Na1 21. b3 a6 22. Ba3 Ra7 23. Bc5 Kd8 24. Qc1 Kc8 25. Qa3 Kc7 26. Qa4 Bb1 27. Qe8 f6 28. Qf7 Kc8 29. Qg8 Kb8 30. Bd6+ Ka8 31. Bb8 Ba2 32. Nd7 Bb1 33. O-O Ba2 34. Rb1 f5 35. Rb2 Bb1 36. Ra2 f4 37. Ra5 Ba2 38. Rg5 Bb1 39. Rg6 hxg6 40. Nh1 Rh3 41. Qh7 Rg3 42. hxg3 Ba2 43. Kh2 Bb1 44. Kh3 Ba2 45. Kg4 Bb1 46. Kf3 Ba2 47. Ke4 Bb1 48. Kd4 Ba2 49. Kc5 Bb1 50. Kb6 Ba2 51. Kc7 Bb1 52. Kd8 Ba2 53. Ke8 Bb1 54. Kf7 Ba2 55. Kg8 Bb1 56. Kh8 Ba2 57. Qg8 Bb1 (2020-11-08)
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comment
Keywords: Castling in the retro play
Genre: Retro
FEN: kB3bQK/rp1Np1p1/p3p1p1/8/2P2p2/1Pp3P1/2PPPPP1/nb5N
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-11-08 more...
2 - P0000195
Frank Christiaans
7167 Die Schwalbe 126 12/1990
P0000195
(13+10)
#3
b) wSe4 nach g8
a) 1. 0-0? droht 2. Tf8+ Kd7 3. Lxe6#
1. ... Lxc5! 2. Sxc5 0-0-0!
1. Thf1! 0-0-0 2. Lxe6+ Td7 3. Tf8#
b) 1. Thf1? Lxc5 2. Sxc5 0-0-0!
1. 0-0! Lxc5 2. Sxc5 ... (0-0-0?) 3. Tf8#
play all play one stop play next play all
a) zuletzt h6-h5 und beide Rochaden sind noch möglich. Schläge von Weiß: Bbxc, Bcxd, Bhxg, Bfxg-g8=L.
b) gegenseitiger Ausschluss der beiden Rochaden. 3 Fälle sind zu betrachten:
b1) zuletzt f7xDe6; Weiß muss 4x geschlagen haben: Bfxexdxc8=L, d.h. s0-0-0 ist unzulässig.
b2) zuletzt d7xDe6; zu den 4 Schlägen von a) wird auch der sBf gebraucht, der sich auf f1 umwandeln muss, also w0-0 unzulässig.
b3) zuletzt h6-h5: wBf zieht über f7 zum UW-Feld g8, g.h. s0-0-0 unzulässig.
Henrik Juel: C+ Popeye 4.61 after analysis (2020-10-30)
A.Buchanan: A very harmonious problem. Suppose that both sides retain castling rights. wLh3 is obtrusive, so wBf/h promoted via g7, and escaped via e6 so sBe6 came from d7 later. Wh has made at least 4 pcs, while Bl has made 2 (D & Lc) dxe6, gxh6. If last move was dxe6, then sD & sLc were captured by officers in cage. Thus sBf was captured by wB, and therefore promoted on f1, disrupting wK. Therefore the last move was h6-h5. In (a) there is no problem retaining both castling rights, but in (b) Sg8 must have reached that square via f6 *after* the promotion, disrupting bK. However in (b) the castling rights are incompatible. In (a) 1. 0-0? Lxc5! 1. Tf1!, while in (b) the reverse.
Neither twin is a PRA problem: in (a) there is no conflict between the castling, while in (b) RS applies: the pre-emptive Wh castling means we are in a reality where Bl cannot castle. (2020-10-31)
comment
Keywords: Castling (wksg), Obtrusive material (L), Retro Strategy (RS)
Genre: Retro, 3#
FEN: r3k3/ppp1p2p/Nb2p3/P1PP2Pp/4N3/7B/3PPRP1/4K2R
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-10-31 more...
3 - P0000604
Andrej N. Kornilow
3948 Die Schwalbe 75 06/1982
7. Lob
P0000604
(0+24)
Färbe die Steine!
Welches waren die letzten 11 Einzelzüge?
James Malcom: Solution? (2020-11-07)
Mario Richter: I do not know the official solution, but the following works:
wLf8 wBe7 wBg6 wBh6 wLh5 wBe4 wTf4 wKg4 wDh4 wSf3 wDg3 wLh3 wSf2 wBg2 wSh2
sBb7 sBc7 sTf7 sBh7 sBd6 sBe6 sKf6 sBe5 sBa3
R: 1. f5xg6ep g7-g5 2. Sg5-f3 a4-a3 3. Kf3-g4 a5-a4 4. Tg4-f4 a6-a5 5. f4-f5 Kf5-f6
6. e3-e4
wCaps: f5xg6ep d7xTe8=L c6xLd7 d6xDe7 b6xLa7 a5xSb6 b6xSa7
wProms: d7xTe8=L a7-a8=S a7-a8=D
sCaps: f6xTe5 (2020-11-10)
comment
Keywords: Coloring problem, En passant, Last Moves? (11)
Genre: Retro
FEN: 5b2/1pp1pr1p/3ppkpp/4p2b/4prkq/p4nqb/5npn/8
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-10-17 more...
4 - P0000775
Ferad Kakabadze
1422 Die Schwalbe 30 12/1974
P0000775
(11+5) C+
#3
Welches waren die letzten 2 Einzelzüge?
1. e8=D! f5 2. exf6ep e5 3. Dxe5#
R: 1. b2-b1=L 0-0
play all play one stop play next play all
Henrik Juel: The forward play is C+ Popeye 4.61
1.e8=D thr. 2.Dc8 thr. 3.Dc3#
1... f5 2.exf6ep e5 3.Dxe5#
(1... f6 does not prevent the threat, so 2.exf6 is not considered dualistic) (2020-09-26)
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comment
Keywords: Last Moves?, Valladao Task, En passant, Promotion, Castling in the retro play, Obtrusive material
Genre: Retro, 3#
FEN: 8/3pPp2/3Pp3/4P3/1N3P2/B7/P1P2P2/kb3RK1
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-09-27 more...
5 - P0000793
Nikita M. Plaksin
Andrey Lobusov

1558 Die Schwalbe 33 06/1975
4. Preis
P0000793
(13+5) C+
#3 (AP)
1. cxd6ep+! Kxg3 2. 0-0! (proving ep ok)
2. ... Kg4 3. g8=D,T#
2. ... a1=D,L 3. Dg5#

R: 1. d7-d5 Tc6xh6 (unless R: Kg1-g2 Th~*h1)
play all play one stop play next play all
VL: A posteriori (AP)!
2.g8Q(R)+/Rg1+? Kf4 3.Qg5#??
Retro: d7-d5, Rc6xh6+ (unless Kg1-g2, Rh~-h1+).
One of the best AP-type problems. (2015-08-20)
James Malcom: The first Valladao AP? (2020-10-03)
A.Buchanan: Hi James, there are 6 earlier ones in PDB, not counting those which are not marked as Valladao (could quite a few, as basic AP is 2/3 of Valladao). Type k='a p' and not g='fairies' and k='valladao', and set sort order by date. The ur-problem is P0003417. (2020-10-03)
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Keywords: Castling (wk), a posteriori (AP), En passant as key, Promotion (ws), Valladao Task (w w w/s)
Genre: Retro, 3#
Computer test: Popeye v4.85 + minor retro/AP thought
FEN: B7/p5PP/p6R/Q1Pp4/8/PP1P2P1/p3P1k1/4K2R
Reprints: (B) Die Schwalbe 48 12/1976
feenschach 40 11-12/1977
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-10-03 more...
6 - P0002026
Thomas R. Dawson
Westen und Daheim 02/05/1915
P0002026
(7+2) C+
#3
1. Lf7! droht 2. Txc3 Kxh7 3. Th3#
1. ... c2 2. Txc2 Kxh7 3. Th2#
1. ... Kxh7 2. Tc5 Kh6,~ 3. Th5#

weisser Anzug ist legal, zuletzt z.B.:
R: 1. Kg7-h8 Be7-e8=S+
play all play one stop play next play all
Gerd Wilts (2001-10-17): The retro play given in the solution serves only to justify that it may indeed be White's turn. The forward play indeed starts with 1. Bf7. The idea of TRD was to compose a problem which is legal but in which one of the knights must be a promoted pawn. TRD called this an "obtrusive Knight".
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comment
Keywords: Promotion (S)
Genre: Retro, 3#
Computer test: C+ Popeye 4.61
FEN: 4N1Bk/2R4P/8/8/1P1P4/1Kp5/8/8
Reprints: 17B Retrograde Analysis 1915
476 Hamburger Problem-Nachrichten 09-10/1949
E1 Problem 5-6 12/1951
RA69 diagrammes 28 07-08/1977
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-11-01 more...
7 - P0002312
Kostas Prentos
5673 feenschach 93 11-12/1989
P0002312
(14+11) cooked
BP in 17,5
1. e3 b5 2. Ld3 b4 3. Lg6 b3 4. axb3 hxg6 5. Ta5 Th3 6. Tb5 Tg3 7. hxg3 a5 8. Th8 a4 9. Dh5 a3 10. Se2 Ta4 11. bxa4 gxh5 12. b3 g6 13. Lb2 Lh6 14. Lg7 Lg5 15. Lh6 Lh4 16. gxh4 a2 17. Sg3 a1=T 18. Txg8#
play all play one stop play next play all
Cook: 1. h4 b6 2. Th3 La6 3. Ta3 h5 4. e3 Lxf1 5. Se2 a6 6. Sg3 Le2 7. Txa6 b5 8. Th6 Ta3 9. Txh8 Tc3 10. a4 Lxd1 11. Ta3 Lf3 12. Tb3 Lb7 13. Txb5 Ta3 14. b3 g6 15. Lb2 Lg7 16. Lxg7 Ta1 17. Lh6 Lc8 18. Txg8#
s. Version P0007474
HHS: "Die Auflösung erscheint zunächst nicht übermäßig schwierig - die TTT schlängeln sich durch die BB hindurch, dabei geht geht der Tg8 über a6, um einen der sB dort wiedererstehen zu lassen. Im 'Gegenzug' vollbringt der Lc8 ein Husarenstück - Dd1 und Lf1 gehen auf sein Konto - aber es funktioniert nicht: Der L kommt nicht über b5 hinweg, denn weder der wT noch der sB (der dort entsteht) haben Zeit, ihm Platz zu machen. Also muß man sich was anderes ausdenken: Die sBB kann man zu einem Überkreuzschlagen der wBBa- und b- ausnutzen: Das erleichtert die Rückführung der linken Türme. Aber das genügt noch nicht: Jetzt braucht Schwarz zuviel Züge. Man muß den Gedanken an den L-Streich aufgeben. Dann können die wFiguren ein analoges Spiel der sB oben rechts ermöglichen. Schwarz schafft die Zugzahl spielend, aber Weiß braucht genau 18 Züge, und das auch nur dann, wenn Tg8 direkt nach g3 kann. Aber was sollte dann der erste wRückzug sein? Bis jetzt hat man die sFiguren problemlos einfach in der NO-Ecke wiedererstehen lassen - man muß auch da einen komplizierteren Modus wählen und darf den wBh- nicht einfach zurückgehen lassen, sondern man muß ihm die Möglichkeit geben, ebenso wie sein sGegenüber den wT auf der h-Linie durchzulassen. Das ist kompliziert und knifflig, aber so und nur so klappt es [dies Wort in Gottes Ohr! HG]. Bestechend ist der Einbau der Verführungen, die immer nur um Haaresbreite scheitern." "Gefällt mir!" (WD als Prüfer) Diese ausgekochten und tollen Kreuzschlagmanöver fand aber leider nur HHS, da es doch eine NL gibt.
Henrik Juel: The content is concealed pawn captures
Despite no visible captures White captured a2xPb3xTa4 to open the a-line for [Ta1,Pa7], and h2xTg3xLh4 with black h7xLg6xDh5 to open the h-line for [Th1,Th8]
This makes life difficult for the human solver and for Natch 3.1, who tested the first 15.0 moves correct in 40 sec.
Testing the entire proof game would need more than a couple of hours by Natch (2018-12-08)
paul: See P0007474 as a version. (2020-11-03)
comment
Keywords: Unique Proof Game, Promotion (t)
Genre: Retro
FEN: 1nbqk1R1/2pppp2/6pB/1R5p/P6P/1P2P1N1/2PP1PP1/rN2K3
Reprints: 143 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-11-04 more...
8 - P0002758
Andrej N. Kornilow
1078 Phénix 15-16 12/1991
P0002758
(25+0)
Färbe die Steine! Welches waren die letzten 9 Einzelzüge?
James Malcom: Solution? (2020-11-07)
Mario Richter: I do not know the official solution, but the following works:
wBb7 wBf7 wBb6 wBg6 wBc5 wTf5 wLf4 wBg4 wBe3 wKg3 wTh3 wDf2 wBh2 wSf1 wSh1
sLg8 sDh8 sBa7 sBc7 sBh7 sBe6 sBf6 sKh6 sBe5 sLg1
wCaps: h5xg6ep f3xTg4 g4xTh5 e6xSf7 d5xSe6 a4xBb5
sCaps: d7xLe6
R: 1. h5xg6ep g7-g5 2. Tg5-f5 d7xLe6 3. f3xTg4 Th4-g4 4. g4xTh5 Kg6-h6 5. Tf5-g5 (2020-11-10)
comment
Keywords: Coloring problem, Last Moves? (9), En passant
Genre: Retro
FEN: 6BQ/PPP2P1P/1P2PPPK/2P1PR2/5BP1/4P1KR/5Q1P/5NBN
Reprints: (34) Die Schwalbe 144 12/1993
Input: Gerd Wilts, 1995-06-03
9 - P0003337
Rudolf Buljan
Problem 41-44 03/1957
2. Preis
15. Thematurnier
P0003337
(11+15) C+
h#2
1. ... exf6ep 2. Sf5 f7#
play all play one stop play next play all
Autor Ing. Rudolf Buljan, Zagreb
Henrik Juel: Analysis
White captured fxg and promoted [Pd2] on d8
Black captured axbxa2-a1=Y, b7xc6, d5xe4, and gxf
The retroplay was R: 1... f7-f5 2.f5xYg6
C+ Popeye 4.61 (2020-09-30)
A.Buchanan: Any ideas how to distinguish usage of “whose move?” and “no legal last move for white” (or black) keywords (2020-10-01)
Henrik Juel: This problem is clearly the latter
I would use 'Whose move?' in retro problems where a deeper analysis is required to determine the move, often with stipulations like '#1 (who?)' (2020-10-01)
comment
Keywords: En passant as key, No legal last move for White
Genre: h#, Retro
Computer test: Popeye 4.61
FEN: 5nkb/1qp1p1n1/2p3PQ/4PpKb/4prRp/P4prB/1PP3PP/8
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-10-01 more...
10 - P0003417
John Frederick Keeble
2206 The Problemist FCS 16, p. 173, 02/1936
P0003417
(4+5) C+
h#3
Weiß zieht an
1. ... exd6ep 2. 0-0-0 dxe7+ 3. Tf8 exf8=T,D#
play all play one stop play next play all
H.Juel: If Black may castle, last move was not made by Ke8 or Ta8, but by Pd5, so it was d7-d5, and hence White may capture en passant. 1... exd6ep 2.0-0-0 dxe7 3.Tf8 exf8=DT# where the castling (belatedly) justifies the e.p. capture.
Not 1... exd6ep 2.Kd8? dxe7 3.Kc8 e8=DT
C+ by Popeye 4.61, except for the promotion mate dual, which was considered acceptable in the old days.
Nachdruck in "Die Schwalbe" 33 mit Diagrammfehler (wBe6 fehlt).
VL: The first AP-problem! Thematic illegal try:
1. ... exd6ep 2.Kd8? dxe7+ 3.Kc8 e8=T(D)#?? (2007-02-11)
Mario Richter: 46 years between this Problem and P1366663 - perhaps this was not Keeble's first AP-Problem?! (2019-08-29)
Ladislav Packa: Of course I know the idea a posteriori. But let my heresy be forgiven - I do not consider it logical. In this particular example, I consider e.p. for proof that black can castling - not vice versa. (2019-08-29)
A.Buchanan: Hi Ladislav. If ep is ok, then Black just moved a pawn with double hop. That doesn't stop Black having e.g. moved bK right at the beginning of the game. So you can't prove that Black definitely can castle this way. What am I missing here? (2019-08-29)
Ladislav Packa: Your statement is perfectly fine. However, the AP condition is usually interpreted as castling is evidence of e.p. However, the second party does not have to do castling - the possibility has already been demonstrated by the existence of e.p. (2019-08-29)
A.Buchanan: Hi again Ladislav. Please try again, I am obviously being very stupid. I don't understand how 1. exd6ep is any more indicative that Black can castle than 1. K~. (2019-08-30)
Ladislav Packa: Hi, Andre!
e.p. is just a result of the d7-d5 move. Black can castle only if it was the last move of black (even without wPe5). Therefore, it does not have the logic of joining the e.p. with castling. For example, ask yourself if black is allowed to castle in the position without wPe5. (2019-08-30)
A.Buchanan: Hi Ladislav, I still don't understand you. Heresies must be explained extraordinarily carefully :-)
Following the conventions:
(1) Black retains castling rights because we cannot prove that bK or bR ever moved.
(2) If e.p. is now played, then we still require the same castling convention, as bK or bR might have moved earlier in the game.
(3) So the actual execution of the e.p. does not prove anything new about castling.
(4) Hence it is incorrect to say "e.p. [is] proof that black can [castle]".
Which step do you disagree with?
Yes by the convention, Black could castle in the position without wPe5. What does that prove? (2020-10-03)
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comment
Keywords: a posteriori (AP), En passant as key, Castling (sg), Promotion (T), Valladao Task
Genre: h#, Retro
Computer test: Popeye 4.61
FEN: r3k3/2p1p3/2P1P3/2KpP3/8/8/8/8
Reprints: V. Die Schwalbe 33, p. 323, 06/1975
2001 CHM Themes 12/2000
3 Die Schwalbe 215, p. 240, 10/2005
A1 Problemkiste 169 02/2007
14 Die Schwalbe 241, p. 374, 02/2010
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2018-01-03 more...
11 - P0003423
Matti Arvo Myllyniemi
3975 Stella Polaris 01/1971
P0003423
(7+11)
h#3 (AP)
0.2.1...
1. ... g6 2. 0-0 gxf7 3. Kh8 Le5#
1. ... cxb6ep 2. 0-0-0 bxa7 3. Td7 a8=D#
play all play one stop play next play all
Henrik Juel: Analysis
If Black can castle both ways, last move must have been b7-b5
C+ Popeye 4.61 (2020-10-25)
comment
Keywords: a posteriori (AP), En passant as key, Castling (sksg), Promotion (D), Valladao Task
Genre: h#, Retro
FEN: r3k2r/p4p1p/8/KpP2PP1/4PBpP/5pp1/6p1/8
Reprints: Nordisches Turnier 1970-1971
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-10-25 more...
12 - P0003781
Imre Sztankovszky
(IX) Problem 29-30 05/1955
P0003781
(5+14)
h#3
1. ... b6 2. Le7 Lxg2+ 3. Kd6 Sxc4#
play all play one stop play next play all
Henrik Juel: Black is missing [Lc8], which was captured on c8, and a rook
Last move was not c3xTb4, because sTc4's check is impossible, so White has the move (2020-10-01)
comment
Keywords: No legal last move for White
Genre: h#, Retro
FEN: 8/1p1p4/3br3/pP1k4/KPbp4/pn1p4/qN4p1/3n3B
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-09-30 more...
13 - P0003788
Zvonimir Hernitz
Vladimir Birek

Problem 41-44 03/1957
1. Preis
15. Thematurnier
P0003788
(2+8) C+
h#6
1. ... ... 2. Th3 f4+ 3. Kf6 f5 4. Kg7 f6+ 5. Kh8 f7 6. Th7 f8=D#
1. ... fxe3 2. Dd4 exd4+ 3. Kd6 dxc5+ 4. Kc7 c6 5. Kb8 c7+ 6. Ka8 c8=D#
play all play one stop play next play all
Autoren Zvonko Hernitz, Zagreb & Vladimir Birek, Rijeka
PR Imre Sztankovszky, Böde
Retro-Patt, Excelsior
TLi entdeckte ein eindeutiges Satzspiel: 1. ... ... 2. Th3 f4+ 3. Kf6 f5 4. Kg7 f6+ 5. Kh8 f7 6. Th7 f8=D# mit Echo in der gegenüberliegenden Ecke!
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comment
Keywords: Echo, Promotion (D), No legal last move for White
Genre: h#, Retro
Computer test: Popeye C-Version 3.52 (2048 KB)
FEN: 8/r7/8/2p1k3/4p3/3qpr2/4pP2/4K3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-10-01 more...
14 - P0003789
Zvonimir Hernitz
Problem 41-44 03/1957
1. ehrende Erwähnung e.a.
15. Thematurnier
P0003789
(3+13) C+
h#3
1. ... exd7 2. Tfe7 d8=T 3. Te6 Tf8#
1. Sc7? e7 Se6 e8=S# (but Wh to move)
play all play one stop play next play all
Autor Zvonko Hernitz, Zagreb
A.Buchanan: So what's the tourney theme exactly? Is it just the wonderful Art.15, the "official joke". There is a unique h#2 retro try: is that a requirement of this tourney? (2020-05-10)
Henrik Juel: You can find the award here, Andrew
http://problem64.beda.cz/silo/problem_41-44_1957.pdf
on p.79
My Serbo-Croatian is a bit rusty, so I will leave the translation to you (2020-05-10)
A.Buchanan: I cannot see the logic behind sBc4d3g5. The solution, the h#2 retro try, and the retro logic are all unaffected by their removal. There are numerous h#3 tries anyway.
I have found the results of this tourney on pages 79-81 of the document above. At 70 pages, it is too long for google translate, but apparently one can do character recognition in google drive for free, and then those pages might be translatable. There is also an interesting article by Fabel at the beginning about conventions, which might be worth resuscitating. I will leave these for someone else.
This document has been photocopied multiple times, and some of the diagrams are very difficult to read. It makes me never want to compose with a black piece on a black square ever again! However the retro condition makes it easier to reconstruct the diagrams. (2020-09-30)
more ...
comment
Keywords: Promotion (T), No legal last move for White, under-promotion
Genre: h#, Retro
Computer test: Henrik Juel: C+ by Popeye 4.61 (2020-05-10)
FEN: 8/3p1rp1/3PPk2/2pnrbpK/2p1q2b/3p4/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-10-01 more...
15 - P0004141
Karl Fabel
1071 The Problemist 12/1933
P0004141
(8+1)
#1
1. ... ... 2. 0-0?
1. ... Kxg2 2. e5#
1. ... Kxf4 2. Df6#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 with analysis (2020-11-30)
comment
Keywords: Castling (wk), No legal last move for Black, Castling in the forward play, Fabel-Opus (82)
Genre: Retro
FEN: 8/8/2Q5/8/4PBN1/3P1k2/6R1/4K2R
Reprints: (IV) Problem 17-18 08/1952
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-11-30 more...
16 - P0004182
Karl Fabel
187 Braunschweiger Neueste Nachrichten 12/1926
P0004182
(5+2) C+
#2
1. ... c6 2. b4 Ka3 3. Ta1#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2020-11-30)
A.Buchanan: What is “fabel opus” keyword intended to convey? (2020-11-30)
Henrik Juel: It is an ordered collection of Fabel's chess problems, as I recall (2020-11-30)
A.Buchanan: Oh you mean like a book? :) (2020-11-30)
Mario Richter: Fabel has keeped a detailed track of all his own compositons in a set of black notebooks, the Opus numbers representing the chronological order of the time the respective problem was composed.
see http://www.fabelschach.de/
In the Fabel-Project, there are links into the PDB (still incomplete), the idea of the keyword "Fabel-Opus" is to provide some kind of backlink from the PDB to the Fabel-Project. (2020-11-30)
A.Buchanan: So it will never be considered just as a source? For example as a keyword can’t attach the composition date to it. Seems a questionable data modelling decision, though I can see the enthusiasm (2020-12-01)
comment
Keywords: No legal last move for Black, Fabel-Opus (14)
Genre: Retro, 2#
Computer test: C+ Popeye 4.61 together with retro thinking
FEN: 8/2p5/8/2B5/8/8/kPP5/1RK5
Reprints: (V) Problem 37-40 09/1956
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-11-30 more...
17 - P0005327
Valerian Onitiu
8397 The Fairy Chess Review 9 28/11/1949
P0005327
(14+16)
BP in 19,0
Die PAS wurde verändert, indem die Position der schwarzen und weißen Steine geändert wurde (Free Chess).
PAS: ssltktdl, LDTKTLSS (nnbrkrqb/pppppppp/8/8/8/8/PPPPPPPP/BQRKRBNN)
1. b3 0-0-0 (Kf8, Te8) 2. Lf6 gxf6 3. Sg3 Lg7 4. Se4 Lh6 5. Sc5 Le3 6. Sa6 Lb6 7. e3 Dg3 8. Lc4 Dd6 9. Le6 fxe6 10. Sf3 Kf7 11. 0-0 (Kg1,Tef1) Tg8 12. Tce1 Tg3 13. Dd1 Th3 14. g4 Tg8 15. Kg2 Tg5 16. Th1 Tb5 17. Sg5 Kg7 18. Df3 La5 19. Te2 Tb6
play all play one stop play next play all
Originalforderung: "In No. 8397 pieces began game on normal ranks, but not in normal array. The two arrays were however similar, e.g., similar pieces were on c1 and f8. Black has just played his 19th move. What was the game?"
Mario Richter: I do not understand, why 1. ... (Kf8, Te8) is noticed as "0-0-0" (does "Free Chess" have a "Free Castling Rule"?) (2020-09-20)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
FEN: nnb5/ppppp2p/Nr1qppk1/b5N1/6P1/1P2PQ1r/P1PPRPKP/7R
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-09-20 more...
18 - P0005367
Ted Brandhorst
3500 British Chess Magazine 12/1973
P0005367
(0+0)
BP in which both sides get their pieces all on squares of the same colour?
(AL: 12,5)
1. a3 a5 2. c3 b6 3. d4 d6 4. e3 e5 5. f4 f6 6. g3 g5 7. h4 h6 8. Sd2 Ta7 9. Kf2 Lg7 10. De1 Kf8 11. Lh3 Lxh3 12. Txh3 Se7 13. Th2
play all play one stop play next play all
Hauke Reddmann: Beim Vorfuehren (im Club vor voellig problemunerfahrenen
Patznasen) kam einer auf
folgende Idee:

1.c3 e5 2.a3 Bxa3 3.Nxa3 a5 4.e3 b6 5.f4 d6 6.g3
Ne7 7.h4 f6 8.Bh3 Bxh3 9.Rxh3 Ra7 10.Rh2 Kf8 11.Kf2 h6 12.Qe1

2 Halbzüge gespart! (2002-11-19)
Ryan McCracken: It's possible to do this faster with a good capturing scheme:
1.e3 d6 2.Ba6 Bh3 3.Bxb7 Bxg2 4.Bxa8 Bxh1 5.Be4 Bf3 6.Bxh7 Bxd1 7.Bxg8 Bxc2 8.Nc3 Bb3 9.Bxf7+ Kxf7 10.axb3 Kf6 11.b4 reaching a monochrome position in a mere 10.5 moves. (2004-10-01)
A.Buchanan: I don't think this "cooked". It's not even unsound: just the author's effort to solve a synthetic challenge, and twice the solution has been superseded, that's all. (2020-11-03)
comment
Keywords: Synthetic problem, Superseded by (P1381496), Non-Unique Proof Game, Ornament
Genre: Retro
FEN: 8/8/8/8/8/8/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-11-04 more...
19 - P0006242
Harold Holgate Cross
5553 FEENSCHACH 09-10/1961
P0006242
(12+15)
#1
b) Be2 nach e3
Mario Richter: vgl. P1011972 (dort sLa3 statt sTa3) (2020-09-23)
comment
Keywords: Castling, Non-standard material
Genre: Retro
FEN: 8/2ppp2p/1p6/1p6/brPN4/rqP3PP/nbrPPP1r/RNk1K2R
Input: Gerd Wilts, 1995-08-14
Last update: Gerd Wilts, 2004-09-12 more...
20 - P0007793
Gerd Wilts
1318 Rochade Europa 09/1996
2. ehrende Erwähnung
Informalturnier 1996-1997
Übriges Märchenschach
P0007793
(13+13)
Welches waren die letzten 25 Einzelzüge?
R: 1. Sc5-b7+ f2-f3 2. Sa6-c5 c6-c7 3. Sc7-a6+ c5-c6 4. f6-f5 c4-c5 5. f7-f6 c2-c4 6. c4xTb3 Tc3-b3 7. c5-c4 b3-b4 8. c6-c5 Lb4-a3 9. a3-a2 Tc5-c3 10. a4-a3 Th5-c5 11. b5xLa4 Th8-h5 12. b6-b5 h7-h8=T 13. b7-b6
play all play one stop play next play all
PR Jörg Kuhlmann 03/1999
Henrik Juel: Next retraction is not unique: 13... g6xTLh7 (2020-11-26)
comment
Keywords: Ceriani-Frolkin Theme, Last Moves?, Non-standard material
Genre: Retro
FEN: 1bRqrb2/pnPRn1p1/3Kp3/P4p2/1P1k4/Bp1P1P2/p2P2P1/2N1N3
Input: Gerd Wilts, 1996-09-03
Last update: Marcin Banaszek, 2020-11-26 more...
21 - P0007827
Bernd Schwarzkopf
(23) feenschach 55, p. 124, 07/1981
P0007827
(11+6)
Welches war der erste Zug?
a) oben: des wUWTb8?
b) unten: der wDd1?
c) unten +wDd1: des wKe1?
a) 0 Züge
b) 0 Züge
c) 0 Züge
play all play one stop play next play all
Bernd Schwarzkopf: Nur Forderung a (b und c gehören zu einem anderen Problem);
Lösung: UW-Tb8 zog nie (2015-03-13)
Mario Richter: In fs55 sind die verschiedenen Stellungén in einem Diagramm zusammengefaßt. Ich sehe zwei Möglichkeiten, wie wir das in der PDB behandeln:
1. So wie aktuell eingegeben (nahe an der historischen Wahrheit, aber schlecht visuell wahrnehmbar - der Nutzer muß wissen, daß er auf die Lösungen zu b) bzw. c) klicken muß, um die entsprechenden Diagramme zu sehen).
2. Aufsplitten in zwei separate Aufgaben.
Was wird gewünscht/präferiert? (2015-03-14)
Henrik Juel: I prefer your second option, Mario (2015-03-14)
Thomas Brieden: Hätte ich obigen Text nicht gelesen, hätte ich auch nicht gewusst, dass man auf entsprechende Lösungen klicken muss. Ich bevorzuge daher auch den zweiten Vorschlag. (2015-03-14)
Alfred Pfeiffer: Diagramm (als Zeroposition) und Forderung so klarer? (2015-03-15)
Olaf Jenkner: So gefällt es mir. (2015-03-15)
A.Buchanan: In the zero diagram, one might also put in a line between ranks 4 & 5. This separator is used in PDB for grid chess etc, but could be helpful here. What do you think? (2020-11-11)
Olaf Jenkner: If I was asked, good idea.
Maybe there's an issue because the line doesn't vanish in a), b) and c) (2020-11-12)
comment
Keywords: First Move? (UT0 / D0 / K0), Type A, Economy record (First move)
Genre: Retro
FEN: KRb1k3/pp1p4/8/8/4k3/8/1PPPPPP1/2B1KB2
Reprints: 2.38 Eigenartige Schachprobleme , p. 200, 2010
2.8 Eigenartige Schachprobleme , p. 198, 2010
2.1 Eigenartige Schachprobleme , p. 198, 2010
Input: Gerd Wilts, 1996-09-03
Last update: A.Buchanan, 2020-12-01 more...
22 - P0008793
Andrej N. Kornilow
Shakhmaty v SSSR 1978
P0008793
(15+8)
#1.5
1. Ta1-d1+? (Completing the castling!)
a) 1. ... Td4 2. Txd4#
0) 1. xc5ep+? (Completing en passant!)
b) 1. ... Tb5 2. Txb5#
0) 1. xe8=S+? (Completing the promotion!)
c) 1. ... e6 2. Sf6#

0) 1. Sxe7+! Lxe7 2. f8=B# (Omitting the promotion!)
play all play one stop play next play all
Henrik Juel: Completing the key isn't legal, 1.'Rd1'/'-bPc5'/'e8S'+, but omitting the promotion in the mating move is, 1.Sxe7+ Bxe7 2.'f8'#. Excellent joke. (2003-09-19)
James Malcom: A very witty joke Valladao! (2020-09-24)
A.Buchanan: Really like this joke (2020-09-25)
Henrik Juel: To see the illegality of completing 1.fxe8=S+?, note the captures:
Black captured fxDe, so [Pg7,h7] were captured on their files, while the other six missing black men were captured by white pawns
The illegality of completing 1.0-0-0,bxc6ep? is rather obvious (2020-09-26)
James Malcom: And for those you don't find it obvious: If the White king hasn't moved, then where did wRa5, and wBb8 if bPb5 has just done a double-step, come from? Neither can be promoted pieces, as White still has all eight pawns. Trying to finish castling and en passant therefore both produce illegal positions and thus cannot be the solution. (2020-09-26)
Henrik Juel: Continuing beating the dead horse...
How does the white player actually perform an entire move?
1.0-0-0+: Ke1-c1 and Ta1-d1
1.bxc6ep+: Pb5-c6 and remove sPc5
1.fxe8=S+: remove sYe8 and Pf7-e8 and replace wPe8 with wSe8 (three fractional actions)
2.f8=Y#: Pf7-f8 and replace wPf8 with wYf8
So a marginally better stipulation might be: 'White to move mates in less than 2 moves' (2020-09-26)
A.Buchanan: I've tried to set up some intermediate diagrams to allow us to show the animation, but the pieces seem to move even for words which are not moves (and marked italic/red). It's quite baffling. It's almost as if someone with privilege has gone in the background and assigned moves to those dead words. If so, that's extremely unhelpful. Gerd was quite active on this site for a month in German lockdown, for which I'm grateful, but one key task is still waiting: to empower the editors by documenting exactly how the animation decides what to do based on the diagram(s) and stipulation. (2020-09-27)
A.Buchanan: The PDB stipulation field should be non-text form to drive the animation. Where the stipulation is non-standard, there should be a Unicode representation of the original, and translations into German, English and French. But cannot overwrite any original non-standard stipulation, in my opinion, as it is part of the composer's work. (2020-09-27)
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comment
Keywords: En passant, Halber Zug, Castling, Promotion, Valladao Task (half!), Joke, Dummy Pawn
Genre: Retro, n#
FEN: 1B1N1bB1/p2ppP2/2P5/R1pk1N2/1r2p3/1P2P1P1/4PP1P/R1K5
Reprints: (III) Quartz 4 1997
Input: Gerd Wilts, 1997-06-21
Last update: A.Buchanan, 2020-09-27 more...
23 - P0510541
Dragomir Rusin
Problem 41-44 03/1957
3. Preis
15. Thematurnier
P0510541
(3+14) cooked
h#4
1. ... Txg7 2. Td3 Txg6 3. Sd4 Txg4 4. Sb3 Ta4#
play all play one stop play next play all
Cook: NL
1. ... Txg7 2. Ka1 Txf7 3. Sg3 Tf2 4. Dc8 Lxd4#
Yuri Bilokin: Correction: 4nrRB/2p2pbK/p3p1p1/5n2/3r2q1/5p2/k7/1b6 (3+14) (2019-01-19)
A.Buchanan: The diagram matches the published one (2020-10-01)
A.Buchanan: Yuri’s correction is sound and seems economical (2020-10-01)
more ...
comment
Keywords: Check Protection, No legal last move for White
Genre: h#, Retro
FEN: 5rRB/pp2ppbK/2pp2p1/5n2/3r2q1/8/k7/1b6
Input: Markus Manhart, 1997-06-26
Last update: A.Buchanan, 2020-10-01 more...
24 - P0577550
Johann J. Chaschtschanski
14447 Schach , p. 79, 03/2000
P0577550
(3+9)
h#7
b) sTc2 nach h6
a) 1. Txg2 Kxg2 2. Ld4 Kh1 3. Le5 fxe5 4. Kf4 e6 5. Kg5 e7 6. Kh4 e8=D 7. Kh3 Dxh5#
b) 1. gxf3ep gxf3 2. Ke5 Kg2 3. Le4 fxe4 4. Kf6 exf5 5. Kg7 f6 6. Kh8 f7 7. Th7 f8=D#
play all play one stop play next play all
Anton Baumann: C+ Gustav 4.1d (2020-11-24)
comment
Keywords: Switchback (K in a), Entblockung, Promotion (D), Promotion in the mating move (D in b), Twin, En passant as key, Selfblock (in b), Corner mate (in b), Model mate (in b)
Genre: h#, Retro
FEN: 8/8/8/5p1p/4kPp1/3bb1p1/2r3Pp/7K
Input: hpr, 2000-10-27
Last update: Gunter Jordan, 2020-11-25 more...
25 - P1000901
Tomislav Petrovic
3 feenschach 137, p. 340, 08-09/2000
Zdravko Maslar gewidmet
P1000901
(14+8) C+
s#2
1. dxc6ep!
1. ... dxc6+ 2. Lxc6 Sc7#
1. ... d6 2. d5 Sc7#
1. ... d5 2. exd5 Sc7#
1. ... dxe6 2. e5 Sc7#
1. ... gxf6 2. Sf5 Sc7#
1. ... g6 2. Lxg6 Sc7#
1. ... g5 2. Sg4 Sc7#
1. ... gxh6 2. Lh5 Sc7#
play all play one stop play next play all
James Malcom: This is a most excellent problem! En passant as the key and a double pickaninny in a short s#2 is surely no easy feat, I'd say. Now, question: Why can't dxc5 be Black's last move? The illegal retraction od b6-b7 is already quite obvious. (2020-10-24)
A.Buchanan: R: 1. cxb6/dxc5? both imply 3 pawn captures by Bl (2020-10-24)
A.Buchanan: I agree this is a beautifully integrated composition (2020-10-24)
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comment
Keywords: En passant, Pickaninny (2x), En passant as key, grab
Genre: Retro, s#
Computer test: C+ Popeye 4.61 after retro-analysis shows that last move was c7-c5
FEN: n2RB3/k2p2pR/Pp2PP1N/bKpP4/PpNPP3/1P6/8/8
Input: Gerd Wilts, 2000-10-08
Last update: A.Buchanan, 2020-10-25 more...
26 - P1000957
Thierry Le Gleuher
10c Messigny 2000
P1000957
(15+14)
BP in 20,5
1. h4 e6 2. Th3 Ld6 3. Te3 Lg3 4. Te5 d6 5. e4 Ld7 6. Lc4 Lb5 7. Ld5 Lf1 8. d3 h6 9. Lg5 hxg5 10. c4 Th6 11. Sc3 Tf6 12. Db1 Tf3 13. Kd1 Te3 14. f4 Te2 15. f5 Tc2 16. Sce2 Tc3 17. f6 Tb3 18. axb3 c5 19. Ta6 Da5 20. b4 Kd8 21. bxa5
play all play one stop play next play all
Lange Wanderung des sTh8 nach b3. Der wBa muss überkreuz geschlagen haben, damit Weiß den wTa1 schnell genug nach a6 spielen kann.
Michel Caillaud: cooked testing the last moves with Jacobi 0.7.5 and constraints for wBa cross-capture
(constraints Pa2-a3xb4xa5 or Pa2xb3-b4xa5 or Pa2xb3xa4-a5) :
9…c5 10.Cc3 Dd7 11.Cce2 Cf6 12.Db1 Re7 13.Rd1 Tc8 14.c4 Tc6 15.f4 Tb6 16.f5 Tb3 17.axb3 hxg5 18.Ta6 Da4 19.bxa4 Rd8 20.a5 Cg8 21.f6 (2020-10-17)
comment
Keywords: Unique Proof Game, Promenade
Genre: Retro
FEN: rn1k2n1/pp3pp1/R2ppP2/P1pBR1p1/2P1P2P/3P2b1/1P2N1P1/1Q1K1bN1
Input: Gerd Wilts, 2000-10-15
Last update: Gerd Wilts, 2005-12-30 more...
27 - P1001097
Michel Caillaud
R121 Probleemblad 01/2001
Special Prize 2001
P1001097
(12+13) C+
h#2
1. cxb6 d6 2. bxc5 Txb8#
1. La7 Lxa7 2. 0-0-0? Tb8#
play all play one stop play next play all
Castling is impossible because, if black can still castle, the diagram position is draw due to the 50-move rule!
White captures: axb, bxc, exf. Black captures: hxg, gxf, exd, dxc. Promotions: a1=T, b1=T, h8=X. The position can only be unblocked by unpromoting White piece on h8. This can only be wRb5. wK must go to c6 to unpin wR. The journey is via g3, h2, e1, b2, & a3.The 50 white moves are: 34 by wK (screens on c8 [with careful step on a2 to let bB pass] then g8), 11 by wB6 (to e3 to exchange place with bB then screen on a7), 3 by wR (promotion on h8), 2 by wBa4.
more ...
comment
Keywords: Non-standard material (tt), 50 move rule, Cant Castler
Genre: Retro, h#
Computer test: Popeye WINDOWS-32Bit-Version 3.65 (2048 KB) Popeye 4.61 (also)
FEN: rb2k3/2p2p1K/1B6/1RPP1PP1/B1Prbrp1/1Prp1p2/2p2P2/N7
Reprints: Probleemblad , p. 220-227, 12/2010
Input: Gerd Wilts, 2001-02-11
Last update: A.Buchanan, 2020-10-10 more...
28 - P1004002
Noam D. Elkies
R0094 StrateGems 17 01-03/2002
Richard Stanley gewidmet
P1004002
(14+15) C+
BP in 23,5
1. Sc3 d5 2. Sxd5 h6 3. Se3 Dd3 4. Tb1 Dh7 5. Sf5 a5 6. e3 a4 7. Dh5 a3 8. Ke2 axb2 9. a4 Ta6 10. a5 Tg6 11. a6 c5 12. a7 c4 13. a8=T c3 14. Ta6 cxd2 15. Tb6 d1=T 16. Ld2 Sf6 17. La5 Td8 18. c3 Sd7 19. Kd3 Dg8 20. Kd4 Th7 21. Lb5 Dh8 22. La4 Sg8 23. Kd5 f6 24. Ke6= patt
play all play one stop play next play all
James Malcom: Is this the record for the longest PG ending in stalemate? (2020-11-13)
A.Buchanan: There are no shorter ones in PDB without a promotion ("=" can mean promotion or draw). Coming at 41.5 by Guus Rol there is P1011937, ending in draw by 3Rep. (2020-11-13)
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comment
Keywords: Unique Proof Game, Non-standard material (Tt)
Genre: Retro
Computer test: Natch 3.1 (15 min.)
FEN: 2brkbnq/1p1np1pr/1R2Kprp/B4N1Q/B7/2P1P3/1p3PPP/1R4NR
Input: Gerd Wilts, 2002-04-05
Last update: A.Buchanan, 2020-11-13 more...
29 - P1004057
W. Shupikow
197 Shakhmatnaya Kompozitsiya 40 2001
P1004057
(3+2) C+
#8
Schwarz hat keinen letzten Zug.
1. ... b5! 2. La4! bxa4 3. Kc1 a3 4. Sc2+ Ka2 5. Sd4 Ka1 6. Kc2 Ka2 7. Se2 Ka1 8. Sc1 a2 9. Sb3#
play all play one stop play next play all
A.Buchanan: Wow remarkable the play is completely unique - and if WTM then #2 (2020-11-18)
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comment
Keywords: No legal last move for Black
Genre: Retro, n#
Computer test: C+ Gustav 4.1d
FEN: 8/1p6/8/8/1N6/1B6/2K5/k7
Input: Gerd Wilts, 2002-05-05
Last update: A.Buchanan, 2020-11-18 more...
30 - P1004193
Per Olin
Suomen Tehtäväniekat 03/2002
Spezielle ehrende Erwähnung
ST Sommerturnier 2001
P1004193
(15+12)
a) BP in 6.0 Zügen (nach Position A)
b) dann Position A nach B in 7.5 Zügen
c) dann Position B nach C in 7.0 Zügen, Schwarz beginnt
d) dann Position C nach D in 6.5 Zügen, Schwarz beginnt

Position A: Diagramm
Position B: wKe1 wTa1g3 wLc1 wSh1b1 wBh2d2c2b2a2 sKe7 sDh8 sTg8a8 sLc8 sSb8 sBf5d7c7b7a7
Position C; wKe1 wTa2 wLc1 wSf1a1 wBd2b2a3 sKe7 sDh8 sTg8a8 sLc8 sSb8 sBd7c7b7a7
Position D: wKe1 wTa2 wLc1 wSf1a1 wBd2b2 sKd7 sDa8 sTa7 sBa6c7b7
1. f4 e5 2. fxe5 Sf6 3. exf6 Tg8 4. fxg7 Df6 5. gxf8=L Dh8 6. Le7 Kxe7 (A)
7. g4 h5 8. Lg2 hxg4 9. Lf3 gxf3 10. Sh3 fxe2 11. Tg1 exd1=S 12. Tg3 Sf2 13. Sxf2 f5 14. Sh1 (B)
Dc3 15. Sa3 Dxc2 16. Sxc2 f4 17. a3 fxg3 18. Ta2 gxh2 19. Sg3 h1=D+ 20. Sf1 Dh8 21. Sa1 (C)
Tg5 22. a4 Tb5 23. axb5 Sc6 24. bxc6 a6 25. cxd7 Ta7 26. dxc8=T Kd7 27. Ta8 Dxa8 (D)
play all play one stop play next play all
Joost de Heer: Solution:

1. f4 e5 2. fxe5 Nf6 3. exf6 Rg8 4. fxg7 Qf6 5. gxf8=B Qh8 6. Be7 Kxe7 (A) 7. g4 h5 8. Bg2 hxg4 9. Bf3 gxf3 10. Nh3 fxe2 11. Rg1 exd1=N 12. Rg3 Nf2 13. Nxf2 f5 14. Nh1 (B) Qc3 15. Na3 Qxc2 16. Nxc2 f4 17. a3 fxg3 18. Ra2 gxh2 19. Ng3 h1=Q+ 20. Nf1 Qh8 21. Na1 (C) Rg5 22. a4 Rb5 23. axb5 Nc6 24. bxc6 a6 25. cxd7 Ra7 26. dxc8=R Kd7 27. Ra8 Qxa8 (D) (2003-08-31)
paul: Jacobi+ using this input:
stip dia 6 forsyth rsb3rq/ppppkp1p/8/8/8/8/PPPPP1PP/RSBQKBSR
stip dia 7.5 forsyth rsb3rq/ppppk3/8/5p2/8/6R1/PPPP3P/RSB1K2S
stip dia 7 forsyth rsb3rq/ppppk3/8/8/8/P7/RP1P4/S1B1KS2
stip dia 6.5 forsyth q7/rppk4/p7/8/8/8/RP1P4/S1B1KS2 (2020-11-24)
comment
Keywords: A to B
Genre: Retro
FEN: rnb3rq/ppppkp1p/8/8/8/8/PPPPP1PP/RNBQKBNR
Input: Gerd Wilts, 2002-09-20
Last update: Alfred Pfeiffer, 2019-03-25 more...
31 - P1009495
Peter Rösler
B4 Problemkiste 148 08/2003
P1009495
(15+16) C+
BP in 5,0
Stafettenschach
1. e4 e5 2. Ke2 Dh4 3. De1 Dxe4+ 4. Kd1 Dh4 5. d4 Dd8
play all play one stop play next play all
Henrik Juel: Without the condition the solution also works, but there are many cooks (2020-11-01)
more ...
comment
Keywords: Unique Proof Game, Relay Chess, Interchange (KD)
Genre: Retro, Fairies
Computer test: paul: Checked by Jacobi (with relay condition) (2020-10-31)
FEN: rnbqkbnr/pppp1ppp/8/4p3/3P4/8/PPP2PPP/RNBKQBNR
Input: Gerd Wilts, 2003-08-15
Last update: Erich Bartel, 2020-11-01 more...
32 - P1011972
Harold Holgate Cross
Die Schwalbe 1961
P1011972
(12+15)
#1
b) wBe2 nach e3
a) 1. 0-0#
R: 1. Tg2-h2 Sf5-d4 2. Th2-g2 Se3-f5 3. Tg2-h2 Sf1-e3 4. Tg1-g2 Se3-f1 5. g2-g1=T ... 6. f3xDg2 ... 7. f4-f3 Da8-g2 8. f5-f4 a7-a8=D 9. f6-f5 a6-a7 10. f7-f6 a5-a6 11. a6xLb5 Lc6-b5 12. Lb5-a4
b) 1. Se2#
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No. 1039 HN
Mario Richter: vgl. P0006242 (dort sTa3 statt sLa3) (2020-09-23)
Henrik Juel: White captured bxc and promoted on a8
Black captured axb and promoted twice on g1: f3xg2-g1=T, g3xh2xg1=L
In part b) the castling right cannot be preserved, because the tempo is wrong (2020-09-23)
comment
Keywords: Cant Castler, Castling
Genre: Retro
FEN: 8/2ppp2p/1p6/1p6/brPN4/bqP3PP/nbrPPP1r/RNk1K2R
Input: Henri Nouguier, 2004-01-11
Last update: Mario Richter, 2020-09-23 more...
33 - P1017461
Kostas Prentos
Andriy Frolkin

Messigny 05/2004
1. ehrende Erwähnung Retro-Kompositionsturnier
P1017461
(13+15) C+
BP in 21,5
1. a4 h5 2. a5 h4 3. a6 h3 4. axb7 hxg2 5. Ta6 Th3 6. Tf6 Ta3 7. h4 c5 8. Th3 c4 9. Td3 cxd3 10. c4 gxf6 11. c5 Lh6 12. c6 Le3 13. c7 Sc6 14. b8=T Sh6 15. Tb4 Tb8 16. Tc4 Tbb3 17. Sc3 Lb6 18. e3 Lb7 19. Sge2 Da8 20. c8=T Ld8 21. Tb8 Sd4 22. Tcc8
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paul: 16.Tc4 T8b3 (2020-11-03)
A.Buchanan: A nice trick for the parser which builds the animation would be to spot when a move is ambiguous. So here 16. ... Tb3 needed to be fixed to be 16. ... Tbb3. In this case, the animation guessed wrong and later reported that 19. ... Da8 was impossible. However in some cases, the error might not be picked up by a later illegal move, yet it could still be important. I will request that Gerd have a look at fixing this ancient issue. (2020-11-04)
A.Buchanan: 22.Tc8 was also imprecise, but did not cause a later illegality so there was no clue. Comparing the diagram at the end of animation to the start diagram would not necessarily be sufficient even for proof games, and completely inadequate for forward stipulations. It’s the parser can best nail these issues on a per-move basis. I’ve emailed Gerd (2020-11-05)
A.Buchanan: Gerd has fixed this: announcement 2020-11-7: The solution engine now no longer plays moves with ambiguous move notation in order to ensure that unambiguous solutions are added.
Thanks so much, Gerd! (2020-11-08)
comment
Keywords: Unique Proof Game, Interchange (TT), Phoenix (TT)
Genre: Retro
Computer test: Natch 2.2 Copyright (C) 1997,98,99,2001,2002,2003 Pascal Wassong
FEN: qRRbk3/pb1ppp2/5p1n/8/3n3P/rrNpP3/1P1PNPp1/2BQKB2
Input: Gerd Wilts, 2004-06-03
Last update: Gerd Wilts, 2020-11-07 more...
34 - P1017464
Andriy Frolkin
Kostas Prentos

Messigny 05/2004
4. ehrende Erwähnung Retro-Kompositionsturnier
P1017464
(13+13) C+
BP in 14,5
1. a4 d5 2. Ta3 d4 3. Tf3 d3 4. g4 dxe2 5. d3 exf1=S 6. Se2 c5 7. Sg3 c4 8. Ke2 c3 9. Dxf1 cxb2 10. c4 e6 11. Sc3 b1=S 12. Dh3 Sd2 13. Te1 Sf1 14. Kxf1 e5 15. Txe5
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paul: The first S Ceriani-Frolkin is a Schnoebelen. (2020-11-03)
comment
Keywords: Ceriani-Frolkin Theme (ss), Unique Proof Game, Homebase (s)
Genre: Retro
Computer test: Natch 2.2 Copyright (C) 1997,98,99,2001,2002,2003 Pascal Wassong
FEN: rnbqkbnr/pp3ppp/8/4R3/P1P3P1/2NP1RNQ/5P1P/2B2K2
Input: Gerd Wilts, 2004-06-03
Last update: A.Buchanan, 2013-01-23 more...
35 - P1067873
Roberto Osorio
Jorge Joaquin Lois

StrateGems 2004
5. Preis
P1067873
(15+13) C+
BP in 22,5
1. b3 g6 2. La3 Lg7 3. Ld6 Lc3 4. Lxc7 Sf6 5. Lxb8 Da5 6. h4 Da3 7. Lh2 a5 8. g3 Ta6 9. Lg2 Te6 10. Kf1 Te3 11. dxe3 d6 12. Dd3 Kd7 13. Da6 bxa6 14. La8 Lb7 15. Sf3 Tc8 16. Lg1 Tc4 17. Sh2 Tg4 18. f4 Kc6 19. Lf2 Kc5 20. Le1 Lf3 21. Ld2 Se4 22. Lc1 Sd2+ 23. Kg1
play all play one stop play next play all
paul: wBc1 circuit (2020-11-29)
more ...
comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1 (3 min.)
FEN: B7/4pp1p/p2p2p1/p1k5/5PrP/qPb1PbP1/P1PnP2N/RNB3KR
Reprints: feenschach 155, p. 296, Herb/2004
Input: Gerd Wilts, 2005-05-14
Last update: Alfred Pfeiffer, 2018-12-21 more...
36 - P1068645
Roberto Osorio
Jorge Joaquin Lois

Moutecidis Fougiaxis Prentos Jubiläumst. 12/2006
1. ehrende Erwähnung K. Prentos 40 Jahre
P1068645
(13+13) C+
BP in 17,0
1. a4 Sa6 2. a5 Sc5 3. a6 c6 4. axb7 Da5 5. b8=L La6 6. Lg3 0-0-0 7. f4 Kb8 8. Kf2 Tc8 9. f5+ Tc7 10. f6 Lb5 11. fxe7 a6 12. e8=L Ld6 13. Lxf7 Se7 14. La2 Dxa2 15. Kf3 Tf8+ 16. Kg4 Txf1 17. Lf2 Txf2
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Silvio Baier: C+ (Euclide 0.95) (2010-02-02)
paul: BB Prentos theme (2020-11-29)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (LL)
Genre: Retro
Computer test: Euclide 0.95
FEN: 1k6/2rpn1pp/p1pb4/1bn5/6K1/8/qPPPPrPP/RNBQ2NR
Reprints: (3) StrateGems 10/2007
Input: Gerd Wilts, 2006-12-21
Last update: A.Buchanan, 2014-05-11 more...
37 - P1070094
Roberto Osorio
Jorge Joaquin Lois

2322 Orbit 38 04/2008
P1070094
(14+14) C+
BP in 17.0
1. c4 Sc6 2. Dc2 Se5 3. Dg6 hxg6 4. f4 Th3 5. Kf2 Tb3 6. axb3 Sg4 7. Kg3 e5 8. Ta6 La3 9. Tf6 a5 10. Kh4 Ta6 11. Kg5 Td6 12. h4 b6 13. Th3 Lb7 14. Tc3 Td3 15. bxa3 Tg3 16. Te3 Lf3 17. Te4 Sxf6#
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paul: 17.--S4xf6# (2020-11-30)
more ...
comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1 (19 m)
FEN: 3qk1n1/2pp1pp1/1p3np1/p3p1K1/2P1RP1P/PP3br1/3PP1P1/1NB2BN1
Input: Gerd Wilts, 2008-09-15
Last update: Alfred Pfeiffer, 2018-12-27 more...
38 - P1080589
Roberto Osorio
Jorge Joaquin Lois

(O5) StrateGems 10-12/2007
P1080589
(14+12) C+
BP in 15,0
1. f4 d5 2. f5 Le6 3. f6 Sd7 4. fxe7 f5 5. exf8=L Se7 6. a4 Sc8 7. Ld6 Dh4 8. Lg3 0-0 9. a5 Tf6 10. a6 Tg6 11. axb7 Tg5 12. b8=D g6 13. Dxa7 Kg7 14. Da2 Txa2 15. Lf2 Dxf2+
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Silvio Baier: 1.f4 d5 2.f5 Le6 3.f6 Sd7 4.fe f5 5.efL Se7 6.a4 Sc8 7.Ld6 Dh4 8.Lg3 0-0 9.a5 Tf6 10.a6 Tg6 11.ab Tg5 12.b8D g6 13.D:a7 Kg7 14.Da2 T:a2 15.Lf2 D:f2+
Rundläufe zweier Bauern mit anschließendem Schlag - damit auch Ceriani-Frolkin(DL); C+ (Euclide 0.95) (2010-02-16)
paul: QB Prentos theme (2020-11-29)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (DL), Pure Round Trip (BB), Homebase (W)
Genre: Retro
Computer test: Euclide 0.95
FEN: 2n5/2pn2kp/4b1p1/3p1pr1/8/8/rPPPPqPP/RNBQKBNR
Input: Gerd Wilts, 2009-01-11
Last update: A.Buchanan, 2015-04-06 more...
39 - P1080625
Roberto Osorio
Jorge Joaquin Lois

R133 Problem Paradise 01-03/2006
P1080625
(13+15) C+
BP in 19,5
1. d4 Sc6 2. Dd3 Tb8 3. Da6 bxa6 4. Sf3 Tb5 5. Sh4 Th5 6. Sf5 d5 7. Sh6 gxh6 8. g4 Lg7 9. g5 Le5 10. g6 Sf6 11. g7 Sd7 12. g8=S Sdb8 13. Sf6 exf6 14. dxe5 Se7 15. e6 Sg8 16. e7 Kd7 17. e8=D+ Kd6 18. Da4 Ld7 19. c3 Le8 20. Dd1
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paul: This PG (with bBe8) was ranked first (judge K. Prentos) (2020-12-01)
more ...
comment
Keywords: Unique Proof Game, Interchange (ss), Pronkin Theme (D), Ceriani-Frolkin Theme (S), Excelsior (w), Promotion (SD), under-promotion
Genre: Retro
Computer test: C+ Natch 3.1 No solution for 19.0 moves
FEN: 1n1qb1nr/p1p2p1p/p2k1p1p/3p3r/8/2P5/PP2PP1P/RNBQKB1R
Input: Gerd Wilts, 2009-01-17
Last update: A.Buchanan, 2020-12-01 more...
40 - P1098611
Jorge Joaquin Lois
5629 Phénix 172 04/2008
P1098611
(13+13)
BP in 21,5
Henrik Juel: Natch 3.1 did little in half an hour
Stopped at pos. 1 (2018-12-27)
paul: 1.h4 g5 2.hxg5 c5 3.Rh6 c4 4.Rb6 axb6 5.Sc3 Ra3 6.Sb5 Re3 7.fxe3 c3 8.dxc3 h5 9.Qd5 Rh6 10.Bd2 Rf6 11.O-O-O Rxf1 12.Be1 Rf4 13.Qf3 f5 14.Rd6 Rd4 15.Rf6 exf6 16.Sa3 Qe7 17.Sb1 Qa3 18.Bd2 Qa8 19.a4 Ba3 20.Kd1 d6 21.Ke1 Kd7 22.Bc1. Hidden white castling. (2020-12-01)
comment
Keywords: Unique Proof Game
Genre: Retro
FEN: qnb3n1/1p1k4/1p1p1p2/5pPp/P2r4/b1P1PQ2/1PP1P1P1/1NB1K1N1
Input: Gerd Wilts, 2010-01-31
Last update: Gerd Wilts, 2010-01-31 more...
41 - P1177496
Wolfgang Dittmann
9456 feenschach 166 12/2006
P1177496
(6+10)
#1 vor 12
Verteidigungsrückzüger, Typ Proca
Anticirce
R: 1. Kf5-f6 Tg6-g5+ 2. Kf4-f5 Sh4-g2+ 3. Kf5-f4 Sg2-h4+ 4. Kf4-f5 Sh4-g2+ 5. Kf5-f4 Sf3-h4+ 6. Kf6-f5 Tg5-g6+ 7. Kf7-f6 Tg6-g7+ 8. Kf6-f7 Tg7-g6+ 9. Kf7-f6 Tg6-g7+ 10. Kf6-f7 Tg8-g6+ 11. c5xd6ep[+wBd2] d7-d5 12. Se8-c7, dann 1. b7#
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paul: Dual: 7.Kf5-f6 Rg6-g5+ 8.Kf6-f5 Rg5-g6+ 9.Kf7-f6 Rg6-g7+ 10.Kf6-f7 Rg8-g6+ etc. (2020-11-17)
comment
Keywords: Circe (Anti-), Defensive Retractor, Type Proca, Draw by repetition
Genre: Retro, Fairies
FEN: 2k5/P1N3r1/1PN2K2/n5r1/6p1/3pp3/b2P2n1/4q3
Input: Gerd Wilts, 2010-09-30
Last update: Mario Richter, 2020-11-18 more...
42 - P1181239
Thomas R. Dawson
The Chess Amateur 12/1923
Asymmetrie-Turnier 1924
1. Preis
P1181239
(15+10) C+
s#5
1. gxf6ep+ Kxe8 2. Dg6+ hxg6 3. cxd8=S ... 4. f7+ Ke7 5. Sxg6+ Sxg6#
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Schwarz hat zuletzt f7-f5 gezogen, da d7-d5 an der retrograden Einsperrung des Lc8 scheitert.
Henrik Juel: C+ Popeye 4.61 after analysis
Analysis
White is missing one man, so last move was not a pawn capture
White pawns captured all six missing black men, so last move was not d7-d5
Obviously last move was not made by Ke7 or Sd8f8, so last move was f7-f5 legitimizing the ep key (2020-11-02)
comment
Keywords: Asymmetrical solution, En passant as key, Symmetrical position, Promotion (S)
Genre: Retro, s#
Computer test: C+ Popeye 4.61 after analysis
FEN: 1NRnBnRN/1pP1k1Pp/4p3/2PpKpP1/2pPQPp1/8/2P3P1/8
Reprints: 87 Asymmetry 1927
199 Mat Plus Review 01-06/2010
H2 ASymmetrie 2013
Input: Frank Müller, 2010-11-25
Last update: A.Buchanan, 2020-11-03 more...
43 - P1186866
Thierry Le Gleuher
T10 Phénix 173/174, p. 7566, 05-06/2008
nach Gerd Wilts
P1186866
(9+9)
Wer ist am Zug?
R: 1. ... f4xLg3 2. Lh4-g3 f5-f4 3. Lf6-h4 h3-h2 4. Lb2-f6 h4-h3 5. Lc1-b2 h5-h4 6. b2xLa3 Lc5-a3 7. e3-e4 Ld4-c5 8. c5-c6 Lf6-d4 9. c4-c5 Le7-f6 10. c3-c4 Lf8-e7 11. c2-c3 e7xTd6 12. Td4-d6 Kd8-c8 13. d6xTc7
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Henrik Juel: White has the move
-1... f4xLg3 -2.Lh4 f5 -3.Lf6 h3 -4.Lb2 h4 -5.Lc1 h5 -6.b2xLa3 Lc5 -7.e3 Ld4 -8.c5 Lf6 -9.c4 Le7 -10.c3 Lf8 -11.c2 e7xTd6 -12.Td4 Kd8 -13.d6xTc7, retract Td4 to h1, Ka8 via g6 to e1, Pd6 to h2, g3-g2, g2xLf3 etc. (2013-08-28)
James Malcom: Is the given retraction unique? (2020-11-08)
Henrik Juel: Unique up to 11.c2-c3, I think (2020-11-08)
Henrik Juel: One of my favorite retros with just kings and pawns
even though the retroplay is not completely unique (so my previous comment is imprecise)
R: 2... h3-h2 3.Lf6-h4 h4-h3 or 3... f5-f4 also work
but not R: 1.e3-e4? or 1.c5-c6?, and White runs out of pawn retractions
nor 2. e3-e4? or 2. c5-c6? f5-f4 3. Le5-g3, and same difficulty (2020-11-09)
Henrik Juel: In the forward play we have several temporal implications, e.g.,
e2-e3 before b7xLa6 before g2xLf3 before g3-g2 before h2xg3
d6xc7 before e7xd6 before b2xLa3 before f4xLg3
Thierry was inspired by P0008574 (2020-11-09)
James Malcom: I see the similarities as well. If Thierry's last 21 moves, stopping at 11. c2-c3 of course, are indeed unique, it seems to be the record for a kindergarten position? (2020-11-09)
A.Buchanan: I think the last 2 single moves are determined. Prior to that it could be f5-f4 or h3-h2, no? (2020-11-10)
Henrik Juel: You are right, Andrew
So, no record, James (2020-11-10)
James Malcom: Ah well then-the linked problem with 16 moves by Gerd oughtta be it then, from what I've searched so far. (2020-11-10)
A.Buchanan: Isn’t the retro record one of the Breyer versions by Thierry Le Gleuher? (2020-11-10)
James Malcom: As far as I know, the TOTAL retro record is, all from P1339006, by Theierry indeed: Type A, 100 moves, Type B, 101 with bP6-h6 & White to move, and, finally Type C, 102 with bP6-h6 and wSc7-a8. (2020-11-10)
James Malcom: For Type B, I meant "bPh5-h6." (2020-11-10)
comment
Keywords: Whose move?, Kindergarten Problem
Genre: Retro
FEN: K1k5/p1Pp2p1/p1Pp4/8/P3P3/P4Pp1/3P1Ppp/8
Input: Gerd Wilts, 2011-02-06
Last update: James Malcom, 2020-11-08 more...
44 - P1186997
Erich Bartel
5552 Problemkiste (138) 12/2001
P1186997
(4+4) C+
h=3 (AP)
0.1...
1. ... hxg6ep 2. 0-0 g7 3. Kh7 gxf8=D=
play all play one stop play next play all
Wenn ep erlaubt sein soll, dann muß g7-g5 der letzte Zug gewesen sein. Dies wiederum bedingt, daß sK+sT noch nicht gezogen haben. Nur unter dieser Betrachtungsweise (AP) ist das Ding korrekt.\eb
Löserstimmen:
Diese AP-Idee ist ja nun hinlänglich bekannt, aber man muß auch darauf kommen, sie für den Valladao zu nutzen. Finde ich prima (MN).
ep, und dann kann Schwarz auch noch rochieren (HM).
Wenn g7-g5 letzter Zug war, darf Schwarz noch rochieren (KF)...
AP (= a posteriori) argumentiert andersrum: wenn Schwarz noch soll rochieren dürfen, muß g7-g5 der letzte schwarze Zug gewesen sein (\eb)
Unlösbar! Der Autor meint wohl, man könnte mit 1. ... hxg6ep 2. 0-0 loslegen; hier irrt Goethe. Die beiden Konventionen -ep-Schlag nur, wenn Zulässigkeit retroanalytisch beweisbar ist; Rochade stets, außer wenn Unzulässigkeit retroanalytisch beweisbar ist- sind zwar passend verknüpft. Was aber den Vorrang hat, zeigt die zeitlich Reihenfolge der Anwendung. Zuerst kommt der ep-Schlag, und diesbezüglich gilt: Zulässigkeit nicht beweisbar, also nicht erlaubt (LZ).
Lieber Herr Zagler, vielen Dank für Ihren Kommentar, aber ich denke nicht, daß dazu eine Stellungnahme erforderlich ist, denn dazu ist schon viel diskutiert und geschrieben worden, ichverweise nur auf G. Lauingers "a posteriori Zwischenbilanz" in feenschach (80) X-XI 1986, S.414 ff, wo die AP-Regelung allgemein wie folgt definiert wurde:
"Eine einleitende Handlung (z.B. ein ep-Schlag oder ein unkonventionell Beginn), deren Zulässigkeit nach gültigen Konventionen zunächst nicht nachgewiesen werden kann, wird im Verlauf der Lösung(en) nachträglich durch einen oder mehrere Sonderzüge legalisiert. Legalisieren bedeutet dabei, daß _nur_mit_der_Ausführung_ des Sonderzuges (der Sonderzüge) dessen (deren) Zulässigkeit nachgewiesen wird und gleichzeitig (i.a. aus retroanalytischen Gründen) damit auch nachträglich die Zulässigkeit der einleitenden Handlung."
Ob Sie nun mit dieser Regelung einverstanden sind hat für o.a. Aufgabe wenig Bedeutung, denn nach o.a. "AP"-Definition ist sie lösbar. Wenn Sie "AP" so nicht akzeptieren und einer anderen Retro-Philosophie zugetan sind, steht das auf einem anderen Blatt. Da müßten Sie sich dann mit den entsprechenden Experten auseinandersetzen. (\eb)
Da nur die Rochade den sK nach h7 zu manövrieren vermag, fällt manchem sicher gar nicht erst auf, daß allein sie (neben dem Autor, natürlich!) für die Legalisierung des e.p.-Schlages verantwortlich ist (MR).
Valladao-Task. Bei dieser Ausgangsstellung mit Ansage (HL).
A.Buchanan: Removing the superfluous sBf7 adds various non-castling lines which the AP convention duly protects us from, and makes the composition a sound miniature (2020-10-03)
comment
Keywords: Valladao Task, Castling, En passant, Promotion, a posteriori (AP)
Genre: Retro
Computer test: %Popeye FreeBSD-4.3-RELEASE-32Bit-Version 3.73
FEN: 4k2r/5p2/5P1P/5KpP/8/8/8/8
Reprints: Springaren (116) 03/2010
K3966 Problemkiste (199/200) 03/2012
Input: Erich Bartel, 2011-02-09
Last update: Alfred Pfeiffer, 2014-09-05 more...
45 - P1260207
Charles Henry Wheeler
892 Dubuque Chess Journal 05/1874
P1260207
(4+7)
s# in wieviel Zügen?
1) R: 1. ... 0-0-0, dann 1. Txg6#
2) R: 1. ... 0-0-0, dann 1. Df7#
play all play one stop play next play all
Weiß kann Selbstmatt ohne einen eigenen Zug erzwingen.
Schwarz rochierte im letzten Zug, obwohl er im Schachstand und ignorierte dabei auch das Schach auf d8. Beides ist illegal. Er muss diesen Zug zurücknehmen und statt dessen Df7# oder Txg6# spielen.
A.Buchanan: No retro analysis to show that last move was in fact castling. Position is not illegal. (2019-10-21)
James Malcom: Perhaps that's why it labeled as a joke then. Andrew. (2020-10-20)
A.Buchanan: Yes it’s a joke but there is an existing species of problem where the position Is illegal. This is kind of like Conan Doyle vs Agatha Christie: here we are only told the key clue after the fact. I am sadly interested in classifying the main families of jokes, identifying which ones are fairies as well etc. This one is not fairy I think. In constraint promotion into foreign units can be joke depending on stipulation, but is definitely fairy (2020-10-21)
comment
Keywords: Joke, Retract illegal move (castling)
Genre: s#, Retro
FEN: 2kr1b2/p3p3/4K1Br/B3R3/8/5q2/8/8
Input: Frank Müller, 2013-01-19
Last update: Alfred Pfeiffer, 2019-10-22 more...
46 - P1288715
Bernd Schwarzkopf
A12 Problemkiste (169) 02/2007
P1288715
(4+3) C+
=5
AP-Priorität
1. dxc6ep 0-0-0 2. b7+ Kb8 3. c7+ Kxb7 4. cxd8=D Ka7 5. Dc8=
3. ... Ka7 4. cxd8=S Kb8 5. Ka6,Kb6=
play all play one stop play next play all
A.Buchanan: Guessing so-called "AP-Priorität" is a variant of AP whereby Black is forced to legitimize (or at least forbidden to rule out the possibility of legitimizing) the earlier e.p. (2020-10-03)
comment
Keywords: En passant, a posteriori (AP), Castling, En passant as key, Promotion, Valladao Task
Genre: Retro, Fairies
Computer test: Popeye v4.85 + minor retro/AP thinking
FEN: r3k3/8/1P1P4/1KpP4/8/8/8/8
Input: Erich Bartel, 2014-09-29
Last update: A.Buchanan, 2020-10-03 more...
47 - P1305230
Thierry Le Gleuher
1 RIFACE 2015
P1305230
(11+1)
Ajouter des pièces.
+wSb2d2 +wLc4
R: 1. Dd1-c2+ Kc2-c3 etc
play all play one stop play next play all
A.Buchanan: How about wLa1 instead? (2020-10-06)
Henrik Juel: Yes, that would improve the economy slightly (2020-10-06)
Ladislav Packa: wBa1 is illegal... (2020-10-07)
A.Buchanan: Hi Ladislav why is wLa1 illegal, please? That was essentially my question before (2020-10-07)
Mario Richter: wLa1 instead of wDa1 is of course legal too: one of the dark-squared wBishops unpromotes on h8, one wQueen on g8. Black pawns g7+h7 let the wPawns g2+h2 pass by cross-capturing the 2 original wRooks. (2020-10-07)
more ...
comment
Keywords: Add pieces, Illegal position
Genre: Retro
FEN: 8/P7/P7/P1Q5/P3K3/P1k5/P1Q5/Q3B3
Input: A.Buchanan, 2015-07-08
Last update: A.Buchanan, 2020-10-07 more...
48 - P1338394
Göran Wicklund
J.Lois-70 JT 2016-2017
2nd Honorable Mention
P1338394
(12+14) cooked
PG in 33.0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a4 Ta5 5. Ta2 bxa2 6. h4 a1=S 7. h5 Sb3 8. h6 Sd4 9. hxg7 Sf5 10. gxh8=L Sh4 11. Le5 f5 12. Lh2 e5 13. g3 La3 14. Lg2 Se7 15. Lc6 dxc6 16. 0-0 Sd7 17. Kh1 Sf8 18. Lg1 Dd5+ 19. Kh2 Kd7 20. Kh3 Dh1+ 21. Lh2 e4 22. Tg1 Te5 23. Df1 c5 24. Dg2 Kc6 25. Df3 Kb6 26. Tg2 Dd1 27. Tg1 Ka5 28. Te1 b6 29. Lg1 La6 30. Kh2 Ld3 31. Kh1 c4 32. Lh2 c5 33. Kg1 Dxe1#
play all play one stop play next play all
Judge J. Lois: This problem presents the theme Lois between the wK1-WBh2(2) with a switchback of both pieces.
In addition, change of place between WKe1-wRh1 in move 31.
Henrik Juel: In the award this proof game is not labelled C+ (2017-08-30)
Michel Caillaud: reported as cooked in Winchloé :
1.a4 b5 2.Ta3 b4 3.h4 bxa3 4.h5 a2 5.h6 a1=S 6.hxg7 Sb3 7.gxh8=L Sd4 8.Le5 Sf5 9.Lh2 e5 10.g3 La3 11.Lg2 La6 12.Lc6 dxc6 13.Kf1 c5 14.Kg2 Kd7 15.Sh3 Kc6 16.Sf4 Kb6 17.Sd5+ Ka5 18.Sb6 axb6 19.Kh3 Dd5 20.Tg1 Dh1 21.Df1 e4 22.Dg2 Sd7 23.Df3 Te8 24.Tg2 Dd1 25.Tg1 Te5 26.Te1 Sf8 27.Lg1 Sge7 28.Lh2 Sh4 29.Lg1 f5… (2020-10-14)
more ...
comment
Keywords: Unique Proof Game, Non-standard material, Lois Theme
Genre: Retro
FEN: 5n2/4n2p/1p6/k1p1rp2/P1p1p2n/b2b1QP1/1PPPPP1B/1NB1q1K1
Input: A.Buchanan, 2017-08-30
Last update: A.Buchanan, 2020-10-15 more...
49 - P1360119
Marken Foo
www.chess.com 2016
P1360119
(14+12)
PG in 7.0 moves
Add the black queen
b) +wSb1
Marken Foo: There is a twin (b) +wSb1 pointed out by the chess.com user caveatcanis back in 2016, when accidentally misreading the diagram. It turns out to be a cute twin that fits the idea. (2020-10-21)
A.Buchanan: How many of these "Where in the world is Carmen Sandiego?" problems have you got, Marken? is it worth making a keyword? https://en.wikipedia.org/wiki/Carmen_Sandiego (2020-10-21)
comment
Keywords: Unique Proof Game, Add pieces (d)
Genre: Retro
FEN: rnbN1knr/pppppp2/8/8/8/8/PPPPPPP1/R1BQKB1R
Reprints: 9 Phénix 287, p. 11252, 07-08/2018
Input: A.Buchanan, 2019-01-25
Last update: A.Buchanan, 2020-10-21 more...
50 - P1368554
Andrew Buchanan
OzProblems.com 16/10/2019
P1368554
(4+3) C+
Gewinn
1. Sd3! Kf8 2. Se3 Sg6+ 3. Kd4 Td8+ 4. Kc3 Tc8+ 5. Sc4 Kg7 6. Sf2 Sh8 7. Tf1 Sf7 8. Se4 Td8 9. Sf6 Sg5 10. Se3 Ta8 11. Kb4 Tb8+ 12. Kc4 Tc8+ 13. Kb5 Tb8+ 14. Kc6 Ta8 15. Sfd5 Ta3 16. Kb5 Se4 17. Te1 Sg5 18. Kb4 Ta2 19. Tf1 Kg6 20. Tf6+ Kh5 21. Kb3 Ta7 22. Sf4+ Kh4 23. Se2 Tb7+ 24. Kc4 Sf7 25. Tf1 Kg5 26. Sd4 Se5+ 27. Kd5 Sd3 28. Se6+ Kg6 29. Sf8+ Kg5 30. Ke4 Sc5+ 31. Kd4 Sd7 32. Se6+ Kg6 33. Sd5 Ta7 34. Se7+ Kh5 35. Tg1 Ta4+ 36. Ke3 Tg4 37. Ta1 Sb6 38. Kf2 Sd7 39. Ta8 Tc4 40. Tg8 Tc2+ 41. Ke3 Tc3+ 42. Kf4 Tc4+ 43. Kf5 Kh4 44. Sf4 Tc5+ 45. Sed5 Txd5+ 46. Sxd5 Kh3 47. Tc8 Kg3 48. Ke6 Sb6 49. Sxb6 Kf2 50. Sc4 Ke1 51. Td8 Ke2 52. Td2+ Ke1 53. Kd5 Kf1 54. Ke4 Kg1 55. Kf3 Kh1 56. Kg3 Kg1 57. Td1#
play all play one stop play next play all
According to the Syzygy tablebase, *any* move wins for White except the silly 1. Sa2??
However, the tablebase does not know about castling!
The quickest winning move 1. Sd3!? would be defeated by 1. ... 0-0-0!? which attacks Sd3 and threatens the skewer Re8+. After this, White can only draw - or even loses after 2. Sc1??
But by a simple retro argument, Black cannot castle.
Since this retro point is essential to the solution, we have a retro problem, and hence the 50 move rule, which by Codex default is disengaged, is switched on.
When working with the 50 move rule, the key concept is not the number of moves to mate, but the number of moves to the first capture, pawn move or checkmate, known as DTZ.
All the alternatives to 1. Sd3 take more than 50 moves to force the first capture. The closest are 1. Sc3 & Se3 which according to Syzygy require exactly 50.5 moves, so seem *just* too slow. (For positions close to the cut-off, one has to be careful about *rounding*, see https://syzygy-tables.info/metrics. The number of half-moves for DTZ can be n or n+1. In fact here, after 1. Sc3/Sf3, the zeroing move is at its earliest White's 52nd move, not 51st.)
By the retro property therefore *only* 1. Sd3!, which requires 45 moves to force the first capture, can win. So this removes all the cooks for the first White move.

Lomonosov DTM #59: 1. Nd3!! Kf8!! 2. Ne3! Ng6+! 3. Kd5 Rd8+ 4. Kc4 Rc8+ 5. Kb5 Rb8+ 6. Ka6 Kf7 7. Nc5 Ne5 8. Nd5 Re8 9. Kb7 Nc4 10. Rf1+ Kg7 11. Kc6 Re5 12. Nd3 Re6+ 13. Kc5 Ne5 14. N3f4 Nd7+ 15. Kb5 Rd6 16. Nc7 Kf7 17. Nfd5+ Kg6 18. Ne7+ Kg5 19. Ncd5 Kg4 20. Rf4+ Kg5 21. Rf2 Kg4 22. Ne3+ Kg5 23. N7d5 Kg6 24. Rf1 Nf6 25. Nf4+ Kf7 26. Nc4 Rd8 27. Ne5+ Kg8 28. Rg1+ Kh7 29. Kc6 Rc8+ 30. Kd6 Re8 31. Re1 Ra8 32. Rh1+ Kg8 33. Ke7 Ra4 34. Rg1+ Kh7 35. Ne6 Nd5+ 36. Kd6 Nf4 37. Nc5 Rd4+ 38. Ke7 Rd2 39. Rg4 Rf2 40. Ncd7 Nd5+ 41. Ke6 Nf4+ 42. Kd6 Rd2+ 43. Ke7 Nd5+ 44. Kf8 Kh6 45. Rh4+ Kg5 46. Nf3+ Kf5 47. Nxd2 (zeroing 50M) Nc7 48. Re4 Ne6+ 49. Ke7 Nf4 50. Nf6 Ng6+ 51. Kf7 Ne5+ 52. Kg7 Kg5 53. Nf1 Kf5 54. Ne3+ Ke6 55. Nc4 Ke7 56. Rxe5+ Kd8 57. Rc5 Ke7 58. Rd5 Ke6 59. Re5# 1-0.
http://www.ozproblems.com/walkabout/walkabout2019#WA1610
https://www.chess.com/blog/Rocky64/a-heraldic-endgame-tablebase-composition

The school shield which inspired the problem:
http://www.calvert-trust.org.uk/images/colour.jpg
Henrik Juel: With White to move, last move was made with Ta8 or Ke8, so Black may not castle
An endgame connaisseur may supply the solution... (2019-10-25)
James Malcom: It is now supplied, Henrik. :) I worked through the Sygyzy tablebase, move by move, to get the computer recommended line. (2020-10-09)
A.Buchanan: Thanks James for this hard work to record a solution. Alas there is not just a single recommended line - White has a choice as early as W3. I wonder too if there is a DTM line which is faster than #57, and still clears the DTZ hurdle although maybe not as quickly as B45 as here. There is no DTM engines for 7 pieces yet.
What is certain is that the key works, and is unique. The exactly details of the best mating line remain to be revealed by improving technology. (2020-10-09)
A.Buchanan: For example, 2. Nc5 has DTZ 90, compared to the "superior" 2. Ne3 DTZ 88. However, if you keep picking the top move all the way through, then the final DTZ is in fact checkmate! I haven't all the Black choices though, but there aren't that many of them (2020-10-09)
A.Buchanan: The Lomonosov tablebase is DTM, and is available for free on Android. Today I found a PC app called Blue Stacks which emulates Android. According to Lomonosov, the position is #59, compared to Syzygy's DTZ offering #57 via zero at B45. When I run through the L. indicative solution (very quick to download and grab all of it), it is close to S.'s choices and all the mainline positions are safe from 50M. The zero is at W47, and the final mate is attractive in the middle of the board.
The real questions are:
(1) Is the #59 sound from 50M perspective? Or can Black force White to delay a few moves in order to avoid 50M trouble somewhere?
(2) How dualized is the solution? How does 50M play into pruning that?
What is clear is that both tablebases agree the solution begins 1. Nd3!! Kf8!! 2. Ne3! Ng6! (2020-10-10)
comment
Keywords: Cant Castler, Aristocrat, 50 move rule, Miniature
Genre: Retro, Studies
Computer test: www.syzygy.com
FEN: r3k2n/8/8/4K3/8/8/8/2NNR3
Reprints: www.chess.com 17/10/2019
Input: A.Buchanan, 2019-10-25
Last update: A.Buchanan, 2020-10-10 more...
51 - P1375286
Andrew Buchanan
James Malcom

PDB Website 30/4/2020
P1375286
(6+3)
#2
(-:
1. dxc7ep! b4 2. c8=D,T#

R: 1. ... c8-c6?! and earlier c8=sB
play all play one stop play next play all
Superseded by P1380851

Related: http://www.matplus.net/start.php?px=1577108437&app=forum&act=posts&fid=xshow2&tid=2395

The 2018 FIDE laws state: "3.7.2 on its first move the pawn may move as in 3.7.1 or alternatively it may advance two squares along the same file, provided that both squares are unoccupied."

Hence Black's newborn 8th rank pawn, which has never been moved before, reserves the right to commence a double-step on its first move, and likewise White receives the right to capture it en passant as they do with a 7th rank pawn.
Henrik Juel: This un-dummy-pawn is like a pawn created on c8 by the Einstein condition
The retroplay looks wrong, what about 1... d8-d6!? 2.d7-d8=sB!? c6xYb5 (2020-04-30)
James Malcom: That makes much more sense Henrik. I have edited it accordingly. (2020-04-30)
A.Buchanan: You don't like Adrian's (: haha? What about :) then? In heraldic terms, it would be described as "regardant". See 270 on https://www.heraldica.org/cgi-bin/atlas.pl?12. I don't know the word for "non-regardant", which is the default direction for the head, e.g. most of the others on that page.
We could replace wBa6a7 with wSa6, but alas having the 3rd knight is non-thematic & distracting. The other thing I would've liked to do is empty b2 so the promotion is forced to be to D. Such a tiny problem should have precision promotion. Needs more thinking. (2020-05-01)
James Malcom: UPDATE: The position has been edited to have one less piece and a precise queen promotion. (2020-10-12)
A.Buchanan: There is dialogue here which is now orphaned by a change of diagram with new matrix. Suggest we revert to the older diagram and mark it superseded by a new PDB entry here (2020-10-12)
James Malcom: I agree-it is now done. (2020-10-12)
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comment
Keywords: En passant, En passant as key, Joke, Joke promotion (b), Tolerated dual promotion (D/T), Promotion (D, T), Superseded by (P1380851)
Genre: 2#, Retro
FEN: k7/PN1N4/PKpP4/1p6/8/8/8/8
Input: James Malcom, 2020-04-30
Last update: A.Buchanan, 2020-10-12 more...
52 - P1375777
James Malcom
PDB Website 10/4/2020
nach Josef Cumpe
P1375777
(1+8)
Last two moves?
(-:
R: 1. 0-0-0# a7-a8=sT
play all play one stop play next play all
See P1234039
Henrik Juel: Missing Joke keyword, I guess (2020-05-11)
A.Buchanan: Curious that retro a7-a8=sT discomforts the animation still - maybe you should report to Gerd? (I trouble him with enough stuff already - don't want to be the only one emailing him! :-) (2020-05-11)
A.Buchanan: Maybe +sBe7f7 to refute R. ... e8=sK/fxe8=sK :-) Note this "cook" is actually prevented in the original. (2020-05-11)
A.Buchanan: Oops and a more major cook R: 1. Se8/g8-f6+ (2020-05-11)
James Malcom: This problem was only half-finished before I fell asleep. It’s fixed now. (2020-05-11)
A.Buchanan: Great! You could save another piece I think -sLg6, -sBf7, + sDf7. This also removes the obtrusive promotion (2020-05-11)
James Malcom: Yes, that is true. Position edited. (2020-05-11)
James Malcom: I see nothing wrong with fiddling if it improves economy. (2020-05-11)
A.Buchanan: If promotion to Bl unit is allowed, can’t Bl just have played e8xd7+ or g8xh7+? Can replace bPd7 with bR but eliminating bPh7 is more complicated. Need +wPh7 +bPg6h6. And also bRb7 to prevent discovered check by bPc8 prior to e7-e8=bK. I think that’s watertight now! :-) (2020-10-13)
A.Buchanan: The issue is that there are two or three levels of Bl promotion joke: this problem relies on the "basic" joke where black officers can be created. But where's the line to stop us promoting to Bl pawn or king? If we go that far, then a position like this 2kr3K/1r1r1qrR/7p/8/8/8/8/8 is required. Oh dear: sorry to have brought it up :( (2020-10-13)
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comment
Keywords: Castling in the retro play, Promotion in the retro play (t), Rex solus (w), Joke, Joke promotion, Type C
Genre: Retro
FEN: 2kr3K/1p1ppqrp/8/8/8/8/8/8
Input: James Malcom, 2020-05-11
Last update: Alfred Pfeiffer, 2020-10-14 more...
53 - P1379499
Andrew Buchanan
1135 Julias Fairies 02/10/2016
P1379499
(3+7)
h#5
Chess4E71
1. c4-c2! b3+ 2. c5-c3 bxc4ep+ 3. d6-d4 cxd5ep+ 4. e7-e5 dxe6ep+ 5. f8-f6 exf7ep#

By the double pawn move convention not:
1. ... b4? 2. ... bxc5 3. d4 cxd6 4. ... dxe7 5. ... exf8=D#

Not 1. c3? bxc3 2. d4 cxd4 3. e5 dxe5 4. f6 exf6 and no h#1 due to bPc5
play all play one stop play next play all
Either the current position is a starting position, or White has just played 0. ... b1-b2, from a position with an impossible check which must therefore have been the starting position itself. In either case, none of the Black pawns have ever moved, and so are eligible to make a double move. wPc1 has also never moved. But what of wPb2? We are up in the air as to whether b2-b4 is legal.

Since we can never prove that a position is not a starting position, the default convention is that it is *not* the starting position. Therefore, White has just begun the game with Black in check, and played 0. ... b1-b2, so is not able to play b2-b4 later.

Eventually, when Chess960 becomes played out, we will all be playing Chess4E71, so best to learn it now. There are three diagonals wPb2 may move along, but only one of them works. Rigorous retro reasoning allows all the pawns to make a double move *except* for wPb2. (Author)
Henrik Juel: No comment (2020-08-30)
James Malcom: I think that the simplest possbility to animate this, if Gerd has time that is, would be to allow a pawn to commence a double step fro anywhere. (2020-08-30)
A.Buchanan: Would also need non-standard e.p. (2020-08-31)
Mario Richter: Henrik walking in the footsteps of Epimenides: a comment saying "No comment" :-) (2020-09-20)
A.Buchanan: This is basically the simplest set of rules & conventions to allow chess with any starting arrangement of the orthodox pieces (2020-09-21)
comment
Keywords: Chess4E71, En passant (4), Pac-Man
Genre: h#, Retro, Fairies
FEN: 5p1k/4p2p/3p4/2p5/2p5/8/1P6/B1P5
Input: A.Buchanan, 2020-08-30
Last update: A.Buchanan, 2020-10-27 more...
54 - P1380195
Norbert Geissler
The Problemist Supplement 2018
after Andrew Buchanan
P1380195
(10+12)
h#3
1. ... e3 2. Da5 Df3 3. b6 Dxa8#
play all play one stop play next play all
The task here is to maximize the number of necessary units in a homebase h#.
Henrik Juel: 1... e3 2.Da5 Df3 3.b6 Dxa8#
White (not Black) has no last move, so he has the move, and the stipulation is really h#2.5 (2020-09-23)
A.Buchanan: Can shift sBd7 to c7 for an entirely different mate, but alas one of sBg7h7 might be removed without losing soundness. (2020-09-24)
comment
Keywords: Homebase (2), No legal last move for White
Genre: h#, Retro
FEN: r2qk1nr/pp1ppppp/8/8/8/8/1PPPPPP1/2BQKB2
Input: A.Buchanan, 2020-09-23
Last update: Alfred Pfeiffer, 2020-09-24 more...
55 - P1380264
Norbert Geissler
3 The Problemist Supplement 154, p. 646, 05/2018
P1380264
(3+7)
h#4
Wie viele Lösungen?
1. Sh6 f4 2. 0-0 f5 3. Kh8 f6 4. Tg8 Txh6# Only one solution!
play all play one stop play next play all
The possible second solution 1. Th7 0-0 2. Td7 Ta1 3. De7 Txa8 4. Kd8 Txb8#
is illegal as white castling is not allowed (last move of white was made by King or Rook)
Henrik Juel: C+ Popeye 4.61 (2020-09-25)
comment
Keywords: Homebase (2)
Genre: h#, Retro
FEN: rn1qk1nr/2p5/8/8/8/8/5P2/4K2R
Input: A.Buchanan, 2020-09-25
Last update: Alfred Pfeiffer, 2020-09-25 more...
56 - P1380439
James Malcom
MatPlus.net Forum 23/09/2020
P1380439
(13+1) C+
#4
1. ... Kxc2 2. Sd2! Kxd3 3. Sc4 Kc2 4. Se3+ Kd3 5. Td1#
play all play one stop play next play all
See also P1380440
Henrik Juel: Apparently there is a #3
1.c4? Kxc2 2.Sc3 Kxd3 3.0-0-0?
But two facts prevent this try
1. Black has no last move, so he has the move
2. wKe1 must have moved, so White cannot castle
The solution is
0... Kxc2 1.Sd2 Kxd3 2.Sc4 Kc2 3.Se3+ Kd3 4.Td1#
C+ Popeye 4.61 (2020-09-29)
comment
Keywords: Rex solus (s), Belen Theme (Anti-), Cant Castler, No legal last move for Black, Capture key
Genre: n#, Retro
Computer test: Popeye 4.61
FEN: 8/8/8/8/8/BPPP1P2/PPB2P2/RNk1KR2
Input: A.Buchanan, 2020-09-29
Last update: Alfred Pfeiffer, 2020-10-08 more...
57 - P1380440
James Malcom
Andrew Buchanan

MatPlus.net Forum 23/09/2020
JM, version AB
P1380440
(10+1) C+
#4
wK has moved so:
1. c4? Kxd3 2. Sc3 Kd4 3. Ld6 Kd3 4. 0-0-0#?
2. ... Kc2 3. c5 Kd3 4. 0-0-0#? is a try

1. f3! Kxd3 2. Kf2 Kc2 3. Se3+ Kd3 4. Td1#

R: 1. Kc1xLc2 Lb1xTc2,Lb1xSc2 Easter Egg!
play all play one stop play next play all
Henrik Juel: Compared to James's P1380439:
1. Last move could be Kc1xLc2, so White has the move
2. White may not castle, so
1.c4? Kxd3 2.Sc3 Kd4 3.Ld6 Kd3 4.0-0-0, 2... Kc2 3.c5 Kd3 4.0-0-0 is a try
The solution is
1.f3 Kxd3 2.Kf2 Kd2 3.Se3 Kd3 4.Td1#
2... Kc2 3.Se3+ Kd3,Kd2 4.Td1#
C+ Popeye 4.61
Very nice, James and Andrew (2020-09-29)
A.Buchanan: Thanks Henrik - Belen precondition of bKc1 was satisfied 1.0 move ago. From that position there is a sound #5 but position is clunky and not Meredith.
You didn’t fall into the trap of thinking Black has no last move: there is a dualized solution with BTM waiting for you if you did. (2020-09-30)
James Malcom: Haha, yeah. I fell for Andrew's trap, hook, line, and sinker! :-) (2020-09-30)
comment
Keywords: Rex solus, Belen Theme (Normal & Anti-), Cant Castler
Genre: n#, Retro
FEN: 8/8/8/8/8/BPPP4/PPk2P2/R2NK3
Input: A.Buchanan, 2020-09-29
Last update: James Malcom, 2020-10-08 more...
58 - P1380663
Pascal Wassong
RIFACE 2016
1st prize
P1380663
(15+16)
Partie Justificative en 9,5 coups
Cylindre vertical
1. d4 Sf6 2. Lh6 Tg8 3. e3 Tah8 4. Da6 Sxa6 5. Sd2 Tb8 6. 0-0-0 Tba8 7. Kb1 Sb8 8. La6 Tgh8 9. Sf1 Sg8 10. Le1
play all play one stop play next play all
Henrik Juel: C+ Jacobi 0.7.5
1.d4 Sf6 2.Bh6 Rg8 3.e3 Rah8 4.Qa6 Sxa6 5.Sd2 Rb8 6.O-O-O Rba8 7.Kb1 Sb8 8.Ba6 Rgh8 9.Sf1 Sg8 10.Be1
On a standard board Black would have made an even number of moves; not so here, with Ra8-h8-b8-a8 (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), Homebase (s), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: rnbqkbnr/pppppppp/B7/8/3P4/4P3/PPP2PPP/1K1RBNNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
59 - P1380664
Michel Caillaud
RIFACE 2016
2nd prize
P1380664
(15+15) C+
Partie Justificative en 7,5 coups
Cylindre vertical
more ...
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
Computer test: C+ Jacobi
FEN: r1bq1bnr/ppppp1pp/k3R3/6n1/7P/8/PPPP1PP1/RNBQKBN1
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
60 - P1380665
Michel Caillaud
Philippe Rouzaud

RIFACE 2016
1st honourable mention
P1380665
(14+15) cooked
Partie Justificative en 15,0 coups
Cylindre vertical
Henrik Juel: Jacobi 0.7.5 was too slow (for me) (2020-10-05)
Michel Caillaud: cooked (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: 1nb2rk1/1pBppp2/1qpr2pn/7p/2PP1P2/5P1N/PP2B2K/1N2bQRR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
61 - P1380666
Thierry Le Gleuher
Pascal Wassong
Jacques Dupin

RIFACE 2016
2nd honourable mention
P1380666
(14+15)
Partie Justificative en 8,0 coups
Cylindre vertical
Henrik Juel: C+ Jacobi 0.7.5
1.Sf3 b5 2.Sh4 Bf3 3.gxf3 b4 4.Bc6 dxc6 5.h3 Qd6 6.Rh2 Qxh2 7.Sg2 Qd6 8.O-O-O-O Qd8
Looks like kingside castling, but is loong castling with [Ra1] (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: rn1qkbnr/p1p1pppp/2p5/8/1p6/5P1P/PPPPPPN1/1NBQ1RK1
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-05 more...
62 - P1380667
Thierry Le Gleuher
RIFACE 2016
3rd honourable mention
P1380667
(15+13)
Partie Justificative en 9,0 coups
Cylindre vertical
Henrik Juel: C+ Jacobi 0.7.5
Cylinder-specific mate with triple-check (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: rnbqkb2/pppp1p2/7N/7p/8/K3r3/PPPPP1PP/R1BQ1BNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-05 more...
63 - P1380668
Michel Caillaud
RIFACE 2016
1st commendation
P1380668
(0+1)
Compléter la position pour
une Partie Justificative en 6,0
coups, se terminant par un
échecs quadruple (C+)
Cylindre vertical
1. e4 e6 2. Dxb7 Da3 3. Dxa7 Txa7 4. e5 Tb7 5. Ke2 Da8 6. Kf3 Tb3++++
play all play one stop play next play all
Henrik Juel: This proof game is C+ Jacobi 0.7.5 (2020-10-06)
A.Buchanan: Thanks Henrik: wish we could show any solution in the animation, by including a sequence of actual diagrams where a fairy move cannot be animated directly. All this requires to implement this is some documentation (2020-10-07)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: 8/8/4p3/8/8/8/8/8
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
64 - P1380669
Marco Bonavoglia
RIFACE 2016
2nd commendation
P1380669
(14+15) C+
Partie Justificative en 5,0 coups
2 solutions
Cylindre vertical
more ...
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
Computer test: C+ Jacobi
FEN: rnbqk1n1/1pppppb1/p5pp/8/2P1P3/3P4/PP3PPP/RN2KBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
65 - P1380676
Pascal Wassong
Axel Gilbert

RIFACE 2015
3rd Place
P1380676
(16+16)
Partie justificative en 12,5 coups
Anti Take & Make
Henrik Juel: Jacobi 0.7.5 was too slow for me (2020-10-05)
comment
Keywords: Anti-Take & Make, Unique Proof Game, RIFACE Retro Composition Tourney (2015)
Genre: Retro, Fairies
FEN: rnbq1knr/p2P1P2/1P1ppp1P/8/7p/b1P1P1PR/2p1p1pP/1NBQKBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
66 - P1380678
Pascal Wassong
Axel Gilbert

RIFACE 2015
4th Place
P1380678
(16+16)
Partie justificative en 8,0 coups
Anti Take & Make
Henrik Juel: C+ Jacobi 0.7.5
1.Sf3 Sc6 2.Se5 Sxe5 [+wSc6] 3.g3 Sd3+ 4.cxd3 [+bSc5] Se4 5.dxe4 [+bSd6] Sf5 6.exf5 [+bSh4] Sg6 7.fxg6 [+bSe5] Sxc6 [+wSb8] 8.Bg2 Sxb8 [+wSa6] (2020-10-05)
comment
Keywords: Anti-Take & Make, Unique Proof Game, RIFACE Retro Composition Tourney (2015), Homebase (s)
Genre: Retro, Fairies
FEN: rnbqkbnr/pppppppp/N5P1/8/8/6P1/PP1PPPBP/RNBQK2R
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
67 - P1380679
Allan Bell
RIFACE 2015
5th Place
P1380679
(16+16)
Partie justificative en 13,5 coups
Anti Take & Make
Henrik Juel: Jacobi 0.7.5 was too slow for me (2020-10-05)
comment
Keywords: Anti-Take & Make, RIFACE Retro Composition Tourney (2015), Unique Proof Game
Genre: Retro, Fairies
FEN: 1nb1k2r/1Qqpnpbp/1pP1P1P1/r6P/8/1pPp1p1p/PB1NPKPR/R4BN1
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
68 - P1380681
Marco Bonavoglia
RIFACE 2015
6th Place
P1380681
(16+16)
Partie justificative en 6,0 coups
Anti Take & Make
Henrik Juel: Solution
1.e4 f5 2.exf5 [+bPf4] g5 3.fxg6 e.p. [+bPg4] Sf6 4.g7 Bxg7 [+wPg8=B] 5.Bxh7 [+bPh5] Sxh7 [+wBd3] 6.Bde2 O-O
The Capture-free keyword is misleading: there are lots of captures, but the captured men 'make' a move to re-appear (2020-10-06)
A.Buchanan: Yes Henrik I started putting that on before I read the definition. I will pull those tags off soon. (2020-10-07)
more ...
comment
Keywords: Anti-Take & Make, RIFACE Retro Composition Tourney (2015), Unique Proof Game, Home Circuit (wBe)
Genre: Retro, Fairies
Computer test: C+ Jacobi
FEN: rnbq1rk1/ppppp1bn/8/7p/5pp1/8/PPPPBPPP/RNBQKBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
69 - P1380682
Oliver Sick
RIFACE 2015
7th Place
P1380682
(16+16)
Partie justificative en 8,0 coups
Anti Take & Make
Henrik Juel: C+ Jacobi 0.7.5
1.Sf3 f6 2.Se5 fxe5 [+wSc4] 3.Sb6 axb6 [+wSc4] 4.Sd6+ exd6 [+wSf7] 5.Sxd8 [+bQf6] Sc6 6.Sxc6 [+bSa5] bxc6 [+wSd4] 7.Sf3 Qxf3 [+wSg1] 8.exf3 [+bQf6] Qd8
Active Sg1 (2020-10-05)
comment
Keywords: Anti-Take & Make, RIFACE Retro Composition Tourney (2015), Unique Proof Game
Genre: Retro, Fairies
FEN: r1bqkbnr/2pp2pp/1ppp4/n3p3/8/5P2/PPPP1PPP/RNBQKBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
70 - P1380852
James Malcom
Andrew Buchanan

MatPlus.net Forum 12/10/2020
nach Josef Cumpe
P1380852
(1+7)
Last two moves?
(-:
See P1234039 and P1375777
The joke here is that pawns may promote to enemy officers (but not to pawns or kings)
Henrik Juel: R: 1... 0-0-0+ 2.a7-a8=sT! (2020-10-12)
A.Buchanan: Maybe this is a moderate joke where we allow promotion to Bl officers, while son-of-P1375777 can be the extreme joke where promotion to any Bl unit is allowed (i.e. pawn & king too), including in the history of the game. What would Josef Cumpe think? :-) He and I are both dressed as clerics in out chesscomposers' blogspot pics: http://chesscomposers.blogspot.com/2012/08/august-16th.html. Perhaps he was a real one though? (2020-10-13)
comment
Keywords: Last Moves?, Joke promotion (t), Rex solus, Type C, Castling in the retro play, Joke, Promotion in the retro play (t)
Genre: Retro
FEN: 2kr2K1/1p1p1npr/8/8/8/8/8/8
Input: A.Buchanan, 2020-10-12
Last update: Alfred Pfeiffer, 2020-10-14 more...
71 - P1380855
James Malcom
MatPlus.net Forum 12/10/2020
P1380855
(14+14) C+
BP in 12.0
1. g3 d6 2. Lg2 Dd7 3. Ld5 Dh3 4. Le6 fxe6 5. a4 Kf7 6. a5 Kg6 7. a6 Kh5 8. axb7 g6 9. bxa8=L Lg7 10. Lg2 Lxb2 11. Sf3 Lg7 12. Lb2 Lb7
play all play one stop play next play all
James Malcom: The theme is that 5 bishops are fianchettoed-one more than normally allowed! (2020-10-13)
Rainer Staudte: Rules allow a 20-bishops-fianchetto. (2020-10-13)
Henrik Juel: Very nice, James
For this short PG any tester will suffice, but if you push this idea further, Natch is much faster than Jacobi (2020-10-13)
A.Buchanan: Can’t a fianchettoed bishop go round to the bank rank and do it again? So even 20 is not a barrier (2020-10-13)
A.Buchanan: Dates in PDB are yyyy-mm-dd or dd/mm/yyyy. Hence I will change publication date from Dec to Oct (2020-10-13)
James Malcom: Right-the date slipped me again!

Andrew, while a bishop can easily be fianchettoed twice+, about the number of bishops doing it, not how many times it is done. I'm sure that an expert could do 6 fianchettoing bishops. (2020-10-13)
A.Buchanan: I am joking James: this is cool already (2020-10-13)
comment
Keywords: under-promotion (L), Phoenix, Impostor (L), Unique Proof Game
Genre: Retro
Computer test: Jacobi v0.7.5
FEN: 1n4nr/pbp1p1bp/3pp1p1/7k/8/5NPq/1BPPPPBP/RN1QK2R
Input: James Malcom, 2020-10-13
Last update: James Malcom, 2020-10-14 more...
72 - P1380882
James Malcom
Andrew Buchanan

PDB Website 14/10/2020
nach Josef Cumpe
P1380882
(2+7)
Last two moves?
(-:
See P1234039, P1375777 and P1380852.
The joke here is that pawns may promote to *any* unit (friend or enemy; officer, king or pawns).
Henrik Juel: R: 1... 0-0-0+ 2.a7-a8=sT
not 2.e7-e8=sK, because then sTa8 would have moved, and castling not allowed (2020-10-14)
A.Buchanan: Exactly, Henrik. Also: sB on 7th rank could retract to 8th rank, so we need sT instead (2020-10-14)
more ...
comment
Keywords: Last Moves? (2), Type C, Castling in the retro play, Non-standard material (tt), Joke, Joke promotion (t), Promotion in the retro play (t)
Genre: Retro
FEN: 2kr3K/1r1r1qrR/7p/8/8/8/8/8
Input: A.Buchanan, 2020-10-14
Last update: Alfred Pfeiffer, 2020-10-14 more...
73 - P1380896
Andrew Buchanan
MatPlus.net Forum 12/10/2020
P1380896
(13+13) C+
PG in 6.5
(-:
1. b4 g5 2. b5 g4 3. b6 g3 4. bxa7 gxh2 5. axb8=sS! hxg1=wT! 6. Txh7 Txh7 7. Th1
play all play one stop play next play all
The joke here is that pawns may promote to foreign units.
Henrik Juel: The testers probably do not work here, but this seems unique
1.b4 g5 .. 4.bxa7 gxh2 5.axb8=sS hxg1=wT 6.Txh7 Txh7 7.Th1 (2020-10-14)
A.Buchanan: According to Joost De Heer, WinChloe has a category “promotions adverses”, and under this, the problem is C+. Looking now for a full Homebase without utilising promotion to enemy pawn, which makes it too easy (2020-10-15)
comment
Keywords: Unique Proof Game, Joke, Joke promotion (sT), Homebase (w)
Genre: Retro
Computer test: C+ WinChloe
FEN: rnbqkbn1/1ppppp1r/8/8/8/8/P1PPPPP1/RNBQKB1R
Input: A.Buchanan, 2020-10-14
Last update: A.Buchanan, 2020-10-15 more...
74 - P1380992
Otto Gross
1 Aufbau (New York) 30/04/1943
P1380992
(13+5) C+
#2
1. gxf6ep! droht 2. Dg5#
1. ... gxh6 2. Sxh6#
1. ... Sf3+ 2. exf3#
1. ... Sxg2 2. e7#
1. ... Sxg6+ 2. Dxg6#
1. ... gxf6+ 2. Sxf6#
play all play one stop play next play all
'Aufbau': Das Problem des en-passant-Schlagens ist in unserer Aufgabe nicht die Schwierigkeit, der wir besonderen Wert beimessen, sondern es handelt sich lediglich darum, die Korrektheit der Stellung nachzuweisen, nämlich warum zuletzt nur f7-f5 von Schwarz geschehen sein kann.
f6-f5 oder Sh4-f3 kann nicht geschehen sein, sonst hätte der weisse König im Schach gestanden; die Möglichkeit, dass evtl. ein dritter Springer, in welchen der fehlende weisse Bauer umgewandelt wurde, bei der Placierung des schwarzen Königs auf g3 durch ein Abzugsschach (Sf2-g4 Kg3xg4) ermöglicht haben könnte, fällt fort, da der fehlende Bauer nur ein weisser Läufer geworden sein kann, der jetzt auf c8 steht. Der bei Beginn des Spiels vorhanden gewesene weisse Läufer muss auf seinem Platz geschlagen worden sein, da Be2 und g2 seine Entwicklung verhinderten.
SCHRECKE: Umwandlungsläufer wLc8! (2020-10-16)
Henrik Juel: C+ Popeye 4.61, after analysis proving that last move was f7-f5 (2020-10-16)
comment
Keywords: En passant as key, Obtrusive material
Genre: 2#, Retro
Computer test: Popeye 4.61
FEN: 2B3N1/2P3p1/4P1PQ/4KpPp/5Pkn/8/3NP1P1/4B3
Input: Mario Richter, 2020-10-16
Last update: Alfred Pfeiffer, 2020-10-17 more...
75 - P1381229
Harry Goldsteen
18160 Die Schwalbe 302 04/2020
Alexander Kisljak zum Gedenken
P1381229
(11+13)
Matt?
Beispielauflösung mri:
R: 1. Tb3xDa3 Db4-a3 2. Df1-a1 Da3-b4 3. De2-f1 Db4-a3 4. Dc4-e2 Da3-b4 5. De2xSc4 Sa5-c4 6. Dg4-e2 Db4-a3 7. Dg8-g4 Dc4-b4 8. Dg7-g8 Df1-c4 9. Dg8-g7 Dh1-f1 10. Dg7-g8 h2-h1=D 11. Df8-g7 h3-h2 12. Dg8-f8 h4-h3 13. g7-g8=D h5-h4 14. g6-g7 h6-h5 15. h5xSg6 Sf4-g6 16. h4-h5 Sd3-f4 17. h3-h4 Sb4-d3 18. h2-h3 Sa6-b4 19. d3-d4 Sb4xDa6 20. Da7-a6 h7-h6 21. Ka6-b6 Sd5-b4 22. Tb6-b5 Sc4-a5 23. Tb5-b3 b3xSc2 24. Se1-c2 b4-b3 25. Sf3-e1 a5xLb4 26. c2-c3 Se5-c4 27. La3-b4 Sg4-e5 28. Tb3-b5 Sh6-g4 29. Tc3-b3 Sg8-h6 30. Lb4-a3 Sh6-g8 31. Tc4-c3 Sg8-h6 32. Sh4-f3 Sh6-g8 33. Tf4-c4 Sg8-h6 34. Tf1-f4 Sh6-g8 35. Ta1-f1 Sg8-h6 36. Ld2-b4 Sh6-g8 37. Lc1-d2 Sf4-d5 38. Tb3-b6 Kb4-a4 39. Ta3-b3 Kc4-b4 40. d2-d3 Kd5-c4 41. Kb6-a6 Kd6-d5 42. La6-b7 Lb7-c8 43. Ta4-a3 Sh5-f4 44. Le2-a6 Tc8-b8 45. Tf4-a4 Db8-a8 46. Ka6-b6 La8-b7 47. Db6-a7 Tb7-c7 48. Db5-b6 Lb6-d8 49. Tf1-f4 Th8-c8 50. Th1-f1 Kc7-d6 51. Sf3-h4 Kd8-c7 52. Sg1-f3 Ke8-d8 53. Lf1-e2 Dd8-b8 54. De2-b5 Tb8-b7 55. Kb5-a6 c7-c6 56. Dd1-e2 Lb7-a8 57. Kc4-b5 Lc8-b7 58. Kd3-c4 c6-c5 59. Ke2-d3 b7xSc6 60. Ke1-e2 Sg8-h6 61. e2-e3 Le3-b6 62. Sd4-c6 Lh6-e3 63. Sb5-d4 Lf8-h6 64. Sa3-b5 g7xBf6 65. f5-f6 Sf6-h5 66. f4-f5 Sd5-f6 67. Sb1-a3 Sb4-d5 68. Sa3-b1 Sa6-b4 69. Sb1-a3 Ta8-b8 70. Sa3-b1 Sb8-a6 71. Sb1-a3 a7-a5 72. f2-f4
play all play one stop play next play all
'Schwalbe' 305 (10/2020) S.711: "Die Widmung erfolgt zur Erinnerung an Kisljaks 10. Todestag (27.12.1938-5.5.2010) sowie wegen der Darstellung des Kisljak-Themas (g/h-Linien); auch hat Kisljak selbst mit dem Grundschema dieser Aufgabe gelegentlich gearbeitet, siehe z.B. 'The Problemist' 1984, 1. Preis, P0002468)
Henrik Juel: Thanks for posting this brilliant resolution retro, Mario
The key point is 5.De2xSc4+, allowing Black to screen on a5 with 5... Sa5-c4+
The Kisljak maneuver then produces another black knight, which uncaptures 19... Sb4xDa6, allowing White to screen on a7 with 20.Da7-a6
Earlier White has been forced to 'waste' 19.d3-d4, so sSb4 cannot get out, but fortunately Black has the pawn retraction 20... h7-h6, so White can utilize the screen with 21.Ka6-b6 (2020-10-28)
A.Buchanan: Stunning! (2020-10-29)
more ...
comment

Genre: Retro
FEN: qrbb4/1Brppp2/1Kp2p2/1Rp5/k2P4/R1P1P3/PPp3P1/Q7
Input: Mario Richter, 2020-10-22
Last update: Mario Richter, 2020-10-28 more...
76 - P1381345
James Malcom
(36) MatPlus.net Forum 14/10/2020
P1381345
(13+11) C+
BP in 9.5
(-:
1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exf8=B gxh1=T 6. Lg2 Ke7 7. Lxb7 Ke6 8. Lxa8 Se7 9. Lb7 Txf8 10. Lxc8
play all play one stop play next play all
http://matplus.net/start.php?px=1603899391&app=forum&act=posts&tid=2475&fid=gen&page=1
James Malcom: The point of this PG was to make a true Belfort, after the lone bishop in P1379376 was pointed out to not be a true Belfort. (2020-10-28)
A.Buchanan: I think the notion of a Belfort piece is the foundation idea. Then the question of whether a composition is a Belfort is derived from that, and should include other criteria as well. The original tourney succeeded in launching this idea, but we are surely allowed to clean up the position definition. I will check in the Encyclopedia (2020-10-30)
A.Buchanan: Belfort is not in the Encyclopedia! (2020-10-30)
more ...
comment
Keywords: Joke (Not!), Schnoebelen Theme (B), Dummy Pawn, Golden Age, Belfort (Lt), Prenix (t), Prentos Theme (B), Ceriani-Frolkin Theme (B)
Genre: Retro
Computer test: Jacobi v.0.7.5
FEN: 1nBq1r2/p1ppnpp1/4k3/8/8/8/PPPPP2P/RNBQK1Nr
Input: James Malcom, 2020-10-28
Last update: James Malcom, 2020-10-30 more...
77 - P1381369
Andrew Buchanan
MatPlus.net Forum 28/10/2020
P1381369
(14+14)
SPG in 4.0
shortest PG with 4 units captured on 1 square
Henrik Juel: 1.Be2-e3 Ba7-a6 2.Lf1xa6 Bb7xa6 3.Dd1-e2 Lc8-b7 4.De2xa6 Lb7xa6
Very easy and C+ by Natch 3.1
Nice tempo move 3... Lb7 (2020-10-29)
A.Buchanan: Thanks - tempo is to force unique order on Wh moves (2020-10-30)
comment
Keywords: Unique Proof Game, Tempo Move, Task (Construction) (4), Superseded by (P1381879), x pieces capture on one square (4)
Genre: Retro
FEN: rn1qkbnr/2pppppp/b7/8/8/4P3/PPPP1PPP/RNB1K1NR
Input: A.Buchanan, 2020-10-29
Last update: James Malcom, 2020-11-14 more...
78 - P1381453
Thomas Volet
18161 Die Schwalbe 302 04/2020
Thomas Brand gewidmet
P1381453
(14+11)
Welche Felder besetzte wBf4?
Beispielauflösung mri:
R: 1. Dd3-a6 c7-c6 2. Ta5-a7 Lb3-a4 3. Tb5-a5 Lg8-b3 4. a7-a8=S Lh7-g8 5. a6-a7 a7xSb6 6. Sc4-b6 f7xLg6 7. Lh5-g6 Lg6-h7 8. Lg4-h5 Lh5-g6 9. Lh3-g4 Lg4-h5 10. Lf1-h3 Lh3-g4 11. Sa3-c4 Lg2-h3 12. Tc1-b1 Lh1-g2 13. Sb1-a3 Ka1-a2 14. Lh3-f1 Lg2-h1 15. Sc3-d1 Lh1-g2 16. Sa4-c3 Lg2-h1 17. Dc4-d3 Lh1-g2 18. Td1-c1 Lg2-h1 19. Td6-d1 Lh1-g2 20. Sc3-b1 Kb1-a1 21. Sd5-c3 Kc1-b1 22. Sc3-a4 Kd1-c1 23. Sb1-c3 Ke1-d1 24. Lg4-h3 Kf1-e1 25. Lh5-g4 Kg2-f1 26. g4xTf5 Te5-f5 27. Kg5-h4 Te8-e5 28. Kf5-g5 Kh3-g2 29. Ke4-f5 Ta8-e8 30. Kd3-e4 Kh4-h3 31. g2-g3 Th3-f3 32. Kd2-d3 Kg5-h4 33. f3-f4 Th4-h3 34. Lg6-h5 Th8-h4 35. Le5-h2 h2-h1=L 36. Ld3-g6 h3-h2 37. Lc3-e5 h4-h3 38. Ke1-d2 h5-h4 39. Ld2-c3 h7-h5 40. Lc1-d2 Lh2-g1 41. Th6-d6 Ld6-h2 42. Th1-h6 Kf6-g5 43. Sb6-d5 Lf8-d6 44. d2xSe3 Sf5-e3 45. Sc8-b6 e3-e2 46. Lf1-d3 Sh6-f5 47. De2-c4 Sg8-h6 48. Dd1-e2 e4-e3 49. Sd6xLc8 e5-e4 50. Sf5-d6 Ke7-f6 51. Sh4-f5 Ke8-e7 52. e2xSf3 Sd4-f3 53. Ta5-b5 Sc6-d4 54. Ta1-a5 Sb8-c6 55. a5-a6 e6-e5 56. h3xDg4 Dg5-g4 57. a4-a5 Df6-g5 58. Sf3-h4 De7-f6 59. Sg1-f3 Dd8-e7 60. h2-h3 e7-e6 61. a2-a4
play all play one stop play next play all
Aus der Lösungsbesprechung 'Schwalbe' 305 (Oktober 2020) S.711-712:
HG: "[Lc8] wurde zuhause geschlagen. Die weißen Bauern schlugen d:e,e:f,h:g,g:f, also alle fehlenden schwarzen Seine. Schwarz schlug a7:b6 und h7:Lg6 (der weißfeldrige Läufer konnte nicht auf b6 geschlagen werden). Also wandelten [Ba2] und [Bh7] schlagfrei um, der sLa4 entstand also auf h1. Der sBe2 schlug nicht, also erfolgte d2:e3, und eine Rücknahme e4:f5 ist daher noch nicht möglich. Die Rücknahme d2:e3 ist erst möglich, wenn wLh2 zurück auf c1 ist, zuvor muss g2-g3 zurückgenommen werden, davor wiederum muss erstens der sLa4 nach h1 gekommen und zweitens der sKa2 die dritte Reihe über h3 (nur dort geht es) überschritten haben. (Der schwarze König wird durch einen Schild eines weißen Springers auf b1 von seinem Feld a2 befreit.) De e4:f5 noch nicht zurücgenommen werden kann (siehe oben) und die Rücknahme von g4:f5 dem sLa4 den Weg nach h1 verbauen würde, muss der sLa4 via g8 und h7 nach h3 (mindestens) ziehen, dafür wiederum muss Schwarz f7:Lg6 zurücknehmen. Dummerweise steht dieser wL dem sL im Weg, er kann nur über sein Ursprungsfeld f1 ausweichen [mri: auch h1 ginge] und den sL nach h1 lassen. Auf f1 steht er aber dem sK im Weg, er muss daher wieder mindestens bis nach h5 ausweichen, um den sK herauszulassen."
...
JA: "This is to compare with a cinema film of detective genre with two Thomas - one Volet, as writer/editor, the other one, Brand, as producer. So, cinema company '2T' is shown ..."
Mario Richter: Another fine retro, very worth studying! (2020-11-01)
Henrik Juel: Yes, indeed
The answer to the stipulated question is e2xf3-f4 (2020-11-01)
comment

Genre: Retro
FEN: N7/Rp1p2p1/Qpp3p1/5P2/b4P1K/4PrP1/kPP1pP1B/1R1N2b1
Input: Mario Richter, 2020-11-01
Last update: Mario Richter, 2020-11-01 more...
79 - P1381496
Ryan McCracken
PDB Website 01/10/2004
P1381496
(0+0)
BP in which both sides get their pieces all on squares of the same colour?
1. e3 d6 2. La6 Lh3 3. Lxb7 Lxg2 4. Lxa8 Lxh1 5. Le4 Lf3 6. Lxh7 Lxd1 7. Lxg8 Lxc2 8. Sc3 Lb3 9. Lxf7+ Kxf7 10. axb3 Kf6 11. b4
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A.Buchanan: Improves on P0005367 (2020-11-03)
comment
Keywords: Synthetic problem, Non-Unique Proof Game, Ornament, Superseded by (P1381525)
Genre: Retro
FEN: 8/8/8/8/8/8/8/8
Input: A.Buchanan, 2020-11-03
Last update: A.Buchanan, 2020-11-04 more...
80 - P1381525
François Labelle
Phénix 2014
P1381525
(10+11) C+
BP in 10,0
1. e3 d6 2. La6 Lh3 3. Lxb7 Lxg2 4. Lxa8 Lxh1 5. Le4 Lxe4 6. c3 Lxb1 7. Db3 Lxa2 8. Dxa2 f6 9. Dxg8 h6 10. Dxf8 Kxf8
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AB: I too made this one yesterday but alas on checking in WinChloe found that Francois’ software had got there first! This shows the utility of WinChloe and the power of Francois’ approach. And at least I can be grateful I didn’t try to publish!

This proof game is too long to be found by François’ general mining program, but he can adapt his program specifically to find ornamental problems such as this where the final positions are highly constrained and he can count whether any move is taking him nearer or further away from the right kind of position. The definitively unproductive lines can easily be pruned. Homebases and symmetric positions are also amenable to this kind of attack

See P1381496.
Henrik Juel: Solution
1.Be2-e3 Bd7-d6 2.Lf1-a6 Lc8-h3 3.La6xb7 Lh3xg2
4.Lb7xa8 Lg2xh1 5.La8-e4 Lh1xe4 6.Bc2-c3 Le4xb1
7.Dd1-b3 Lb1xa2 8.Db3xa2 Bf7-f6 9.Da2xg8 Bh7-h6
10.Dg8xf8 Ke8xf8
was found by Natch 3.1, which was stopped before completion
The C+ was probably found by construction, not by testing
The light-colored bishops do most of the work, with the white queen sweeping up at the end (2020-11-04)
A.Buchanan: Thanks Henrik - Natch 3.2 did complete in about 90 minutes. Oh the sadness of anticipation... (2020-11-05)
comment
Keywords: Unique Proof Game, Ornament
Genre: Retro
Computer test: C+ Natch 3.2 in 1hr 32 mins
FEN: 1n1q1k1r/p1p1p1p1/3p1p1p/8/8/2P1P3/1P1P1P1P/R1B1K1N1
Input: A.Buchanan, 2020-11-04
Last update: A.Buchanan, 2020-11-05 more...
81 - P1381571
Jeff Coakley
50 The Puzzling Side of Chess 191, p. 14, 30/6/2020
P1381571
(14+8)
Welches waren die letzten 10 Einzelzüge?
R: 1. h4xg3ep+ g2-g4 2. Te6-e2+ c5xb6ep+ 3. b7-b5 c4-c5+ 4. Kb6-a6 b5xc6ep+ 5. c7-c5 Sd4-f3+
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https://www.canadatype.com/cc/puzzlingside/archives/Puzzling_Side_191_Retro_World_V_Momentary_Lapse_in_Time.pdf
Henrik Juel: Three ep captures in the retroplay was first shown 105 years ago, P0002031 (2020-11-06)
James Malcom: Many, many thanks for that Henrik! However, this seems to be the first bicolor 3 ep representation?!

Also, how many other 3 ep retractor showings are there? I have only found a few: P0000018 (cooked), P1193561, and P1193562 come with a hoard of promoted pieces, and P0000326, P0002591, and P0002031 are all "proper" retractors, but all of them are one-sided. (2020-11-06)
Henrik Juel: James, you might want to try to find the first example of 4 ep captures in the retroplay
The best chance is probably bicolor (2020-11-06)
Henrik Juel: In the proof game genre, which is easier than the last moves? one, the current PDB records are
Orthodox: 3 ep captures, P1000929
Madrasi: 8, P0005964
Circe Parrain: 10, P1095546 (2020-11-06)
James Malcom: Henrik, the fairy record actually is- Anti Take & Make: 13. P1380673
I know of the solution thanks to Juraj, the fairy master, on Matplus.
Also- Monochrome: 3, P1240593

And indeed, 4 is likely is more possible with bicolor, as 4 by one side can only be done with at least one promoted piece Q/B, which may very well be frowned upon no doubt.

And also on an interesting note, in fairy retractors, it seems that 5 has been done at the least in a VRZ, Typ Proca, P0003873. (2020-11-06)
James Malcom: Actually, it turns out that the bicolor representation has been done before, no shocker there: 1969, P0004900 & 1994, P0004497 I've tagged all of these showing under "ep in retroplay' for better clarity and searching. (2020-11-07)
comment
Keywords: Last Moves? (10), En passant in the retro play
Genre: Retro
FEN: 2R1R3/p2b3p/kPP4P/n5Pr/1Q6/1P3NpK/2P1r2P/5BB1
Input: James Malcom, 2020-11-06
Last update: James Malcom, 2020-11-06 more...
82 - P1381791
James Malcom
Facebook 26/09/2020
P1381791
(16+15) C+
BP in 6.5
Where did the Black queen disapear?
1. g3 b6 2. Lh3 La6 3. Lg4 Dc8 4. Sh3 Db7 5. 0-0 Dh1+ 6. Kxh1 Lc8 7. Te1
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more ...
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Computer test: C+ Natch 3.1
FEN: rnb1kbnr/p1pppppp/1p6/8/6B1/6PN/PPPPPP1P/RNBQR2K
Input: James Malcom, 2020-11-12
Last update: Alfred Pfeiffer, 2020-11-13 more...
83 - P1381879
Andrew Buchanan
MatPlus.net Forum 3/11/2020
P1381879
(13+13) C+
BP in 7.0
1. e4 a6 2. Lxa6 bxa6 3. De2 Lb7 4. Dxa6 Sxa6 5. b4 Db8 6. b5 Da7 7. bxa6 Dxa6
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Inspired by P1381620

See also P1381369
Henrik Juel: C+ Natch 3.1
1.Be2-e4 Ba7-a6 2.Lf1xa6 Bb7xa6 3.Dd1-e2 Lc8-b7
4.De2xa6 Sb8xa6 5.Bb2-b4 Dd8-b8 6.Bb4-b5 Db8-a7
7.Bb5xa6 Da7xa6
Six captures on a6 (2020-11-14)
comment
Keywords: Unique Proof Game, Task (Construction) (6), x pieces capture on one square (6)
Genre: Retro
Computer test: Natch 3.1
FEN: r3kbnr/1bpppppp/q7/8/4P3/8/P1PP1PPP/RNB1K1NR
Input: A.Buchanan, 2020-11-14
Last update: Alfred Pfeiffer, 2020-11-16 more...
84 - P1381928
Guus Rol
www.chess.com 14/11/2020
P1381928
(4+5) C+
#1
a) 1. Df5#,De6#,Df7#? aber Schwarz ist am Zug!
a) 1. ... Kxg6 2. Df5#
1. ... Lxg4 2. Df7#
1. ... Lxg6 2. De6#
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Henrik Juel: C+ Popeye 4.61
missing variation: 1. ... Kxg6 2. Df5#
If White had the move, 1.Df7,De6,Df5# would mate immediately
But Black has no last move, so he has the move, and his three possibilities are met with just these mates (2020-11-15)
comment
Keywords: No legal last move for Black, Fleck Theme (3)
Genre: Retro
Computer test: C+ Popeye 4.61
FEN: 8/6p1/3K1kPb/3Q2pb/6P1/8/8/8
Input: A.Buchanan, 2020-11-15
Last update: Alfred Pfeiffer, 2020-11-17 more...
85 - P1382027
Enzo Minerva
L'Unita 14/08/2007
P1382027
(10+5)
BP in 18.0
1. c4 d5 2. Db3 Lh3 3. gxh3 f5 4. Dxb7 Kf7 5. Dxa7 Kg6 6. f3 c5 7. Dxe7 Txa2 8. Kf2 Txb2 9. Dxg7+ Kh5 10. Dxg8 Txb1 11. Txb1 Kh4 12. Dxh8 h5 13. Dh6 Lxh6 14. Txb8 Le3+ 15. dxe3 Dxb8 16. Kg2 Df4 17. exf4 d4 18. Le3 dxe3=
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Record for the shortest possible mutual stalemate

https://timkr.home.xs4all.nl/chess2/diary19txt.htm
Henrik Juel: This non-unique proof game is probably the shortest to reach the diagram position (2020-11-17)
Mario Richter: For a detailed history of the hunt for the shortest PG see Enzo's interesting article "Nuovo record nello stallo reciproco" in 'Best Problems" Nr. 44 (issue 04/2007).
Btw., most sources call this a "double-stalemate" (not "mutual") ... (2020-11-18)
Mario Richter: s. http://www.bestproblems.it/bppdf/BP044.pdf (2020-11-18)
A.Buchanan: That is probably very difficult to find and unlikely that many unique proof games can exist of that form (2020-11-19)
James Malcom: I'm unaware of any unique PGS that end in a mutual stalemate, but surely it must be possible, who the genius may be. (2020-11-19)
A.Buchanan: We’re missing some keywords for stalemate and mutual stalemate objectives. Also what are construction task and record and what’s the difference? (2020-11-19)
Henrik Juel: Euclide 1.01 found no solutions in 17.5 moves (30 hours), so it is extremely likely that all shortest proof games last 18.0 moves (2020-12-01)
comment
Keywords: Construction task, Construction record, Non-Unique Proof Game
Genre: Retro
FEN: 8/8/8/2p2p1p/2P2P1k/4pP1P/4P1KP/5BNR
Reprints: 5 Best Problems 4, p. 95, 2007
61 Tim Krabbé's Website 16/08/2007
Input: James Malcom, 2020-11-17
Last update: James Malcom, 2020-11-19 more...
86 - P1382408
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Roberto Osorio

15 feenschach 237, p. 224, 09-10/2019
P1382408
(12+11) C+
BP in 9.5
1. d4 a5 2. d5 a4 3. d6 a3 4. dxc7 axb2 5. cxb8=D bxc1=D 6. Dxc8 Dg5 7. Dc4 Dxg2 8. Dxf7+ Kxf7 9. Lxg2 Ke8 10. Lf1
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Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
A.Buchanan: Can anyone send me the full results of this JT please? I have an unpublished one which is similar in theme, and I want to confirm that I’m not anticipated. I will load all problems into PDB if they’re not already here (2020-11-26)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Dd), Switchback (Lk), Ceriani-Frolkin Theme (Dd)
Genre: Retro
FEN: r2qkbnr/1p1pp1pp/8/8/8/8/P1P1PP1P/RN1QKBNR
Input: Gunter Jordan, 2020-11-25
Last update: A.Buchanan, 2020-11-25 more...
87 - P1382432
Andrew Buchanan
Facebook 26/11/2020
P1382432
(11+15) C+
KBP
1. g4 h5 2. Lg2 hxg4 3. Lf3 gxf3 4. Kf1 fxe2+ 5. Kg2 exd1=T! 6. Kf3! Txc1 7. Ke2 Te1+ 8. Kxe1
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Henrik Juel: Excellent find, Andrew
Hint: length is 7.5 (2020-11-25)
A.Buchanan: Thanks Henrik - amazed to find it’s not in WinChloe or Yacpdb (2020-11-26)
A.Buchanan: The animation fails for "SPG", instead "KBP" is needed. (2020-11-26)
more ...
comment
Keywords: Unique Proof Game, Homebase (2), Pure Round Trip (K5), Ceriani-Frolkin Theme (t), Prentos Theme (t), Tempo Loss
Genre: Retro
Computer test: C+ Natch 3.1 C+ Euclide 1.01 for 6.0, 6.5, 7.0 & 7.5 moves, which is conclusive.
FEN: rnbqkbnr/ppppppp1/8/8/8/8/PPPP1P1P/RN2K1NR
Reprints: chess.stackexchange.com 26/11/2020
Input: A.Buchanan, 2020-11-25
Last update: A.Buchanan, 2020-11-26 more...
88 - P1382488
Andrew Buchanan
Thomas Thannheiser

1509 Julias Fairies 25/05/2020
P1382488
(13+15) C+
PG in 8.5
Alphabetic Chess
Aims to be the shortest SPG for a homebase position which demonstrates this fairy condition.
Henrik Juel: I cheated and used Jacobi
Nice condition-specific manouver by Sb1 (2020-11-26)
comment
Keywords: Unique Proof Game, Homebase (2), Alphabetic Chess, Economy record (Alphabetic homebase)
Genre: Retro, Fairies
Computer test: Jacobi v0.4.7
FEN: rnbqkbnr/1ppppppp/8/8/8/8/2PPPPPP/1NBQKBNR
Input: A.Buchanan, 2020-11-26
Last update: A.Buchanan, 2020-11-26 more...
89 - P1382569
Jewgenij J. Gik

P1382569
(11+11)
BP in 18.5
1. e4 d5 2. e5 d4 3. c3 f6 4. Df3 Kf7 5. Dxb7 Dd5 6. Kd1 Dxg2 7. Kc2 Dxf1 8. Dxc8 Dxg1 9. Dxb8 Txb8 10. Txg1 Tb3 11. Tg6 Ta3 12. Th6 gxh6 13. bxa3 Kg7 14. Kb2 d3 15. e6 a5 16. h4 a4 17. h5 c5 18. f4 c4 19. f5=
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The fastest known symmetrical, mutual stalemate
James Malcom: Source: Shakhmatyi i Matematika,, 1983. (2020-11-29)
Henrik Juel: The position can be reached in 18.0 moves, e.g.
1. Bc2-c3 Ba7-a5 2. Be2-e4 Ba5-a4 3. Dd1-g4 Ta8-a5
4. Ke1-d1 Bb7-b5 5. Lf1-c4 Bd7-d5 6. Dg4xc8 Bb5xc4
7. Dc8xc7 Bf7-f6 8. Dc7xb8 Dd8xb8 9. Kd1-c2 Db8xh2
10. Bf2-f4 Dh2xg1 11. Bg2-g4 Dg1-c5 12. Th1-h6 Dc5-a3
13. Bb2xa3 Bd5-d4 14. Kc2-b2 Ta5-h5 15. Be4-e5 Bd4-d3
16. Bf4-f5 Ke8-f7 17. Bg4xh5 Bg7xh6 18. Be5-e6 Kf7-g7 (2020-11-29)
Henrik Juel: ... but not in 17.5 moves, according to Euclide 1.01 (2020-11-29)
James Malcom: In other notatiom: 1. c3 a5 2. e4 a4 3. Qg4 Ra5 4. Kd1 b5 5. Bc4 d5 6. Qxc8 bxc4 7. Qxc7 f6 8. Qxb8
Qxb8 9. Kc2 Qxh2 10. f4 Qxg1 11. g4 Qc5 12. Rh6 Qa3 13. bxa3 d4 14. Kb2 Rh5 15.
e5 d3 16. f5 Kf7 17. gxh5 gxh6 18. e6+ Kg7

And by crikey! This is big news! This means that Gik actually had the record all along, and Minerva only tied it with his P1382027! (2020-11-29)
Henrik Juel: Gik's position is the record, but neither he nor Minerva knew this (2020-11-30)
James Malcom: This is an exciting development in the story of the mutual stalemate! (2020-11-30)
A.Buchanan: Well discovered! (2020-11-30)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: 5bnr/4p1kp/4Pp1p/5P1P/p1p5/P1Pp4/PK1P4/RNB5
Reprints: 5 Best Problems 4, p. 94, 2007
61 Tim Krabbé's Website 16/08/2007
Input: James Malcom, 2020-11-29
Last update: Rainer Staudte, 2020-11-29 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (39)
Markus Manhart (1)
hpr (1)
Henri Nouguier (1)
Frank Müller (2)
Erich Bartel (2)
A.Buchanan (31)
James Malcom (8)
Mario Richter (3)
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