Die Schwalbe

8 problem(s) found in 3648 milliseconds (displaying 8 problem(s)). [COMMENTDATE>=20220810 AND NOT K='Weglenkung' AND K='Cross-capture'] [download as LaTeX]

1 - P0000899
Giuseppe Brogi
743 Die Schwalbe 06/1972
P0000899
(8+15) cooked
h#2
b) wSa1
a) 1. T2xh3 Txh3 2. 0-0 Th8#
b) 1. La4 0-0 2. Tf8 Te1#
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a) White cannot cross-capture, so because of sTh2, w0-0 impossible.
wBe captured sD, either to be captured on f-file or to promote without disrupting sKe8.
b) sTh2 can return to a8 only via e8 as Black cannot cross-capture, so s0-0 is impossible.
wBe was waylaid or promoted after disrupting sKe8.
Cook: 1. T2xh3 Lb4 2. Txg3 Txh8#
1. Sd2 Lf6 2. Tf8 Sd6#
(cooked by MR)
See P0003736 a companion problem.
milan: [-bPa7b6wPg3bSa1+bPg3bBa5-b4 bPc6-d6] h#2 1.2...bRh2? illegal move? M.Frelih (2023-03-30)
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Keywords: Cant Castler, Castling (wksk), Cross-capture (s,w), Superseded by (P1399805)
Genre: h#, Retro
Computer test: Popeye v4.87
FEN: B3k2r/pN1p1p2/1pp3p1/bb3p2/8/p1B3PP/5P1r/nn2K2R
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-03-16 more...
2 - P0003736
Giuseppe Brogi
1249 Sinfonie Scacchistiche 07-09/1972
P0003736
(12+12) cooked
h#2
b) wSa5
a) 1. f5 Le5 2. 0-0 Th8#
b) 1. Kd8 0-0-0 2. Te8 Lf8#
play all play one stop play next play all
Try to deduce the diagram error, as we do have the intended solutions!
a) wRh7 is original, but cannot have escaped from cage by white cross-capture as there are too many captures needed. On the other hand, Black only has to make 4 captures so the cross-capture is ok.
b) changing the colour of Sa5 shifts the capture balance: now White can cross-capture but not Black, so White but not Black can castle.
Thus the retro-logic works with the diagram as it is, but the forward logic does not. How can we repair the diagram?
See P0000899 a companion problem.
A.Buchanan: Something odd going on here. There are numerous h#2 in both a&b. PRA not normally found in a problem with single solution for each twin. White has 8 pawns so trivially wRh7 must be original. (2018-10-13)
A.Buchanan: There are three similar problems by Brogi which are all twinned RS rather than PRA, but don't have diagram error. P0003743, P0003746 & P0003747. (2018-10-13)
VL: Nothing to do with Retro Strategy (nor with PRA). One definite castling is legal in every case. (2021-02-09)
Ladislav Packa: Cooked a) and b):
1...b8S and 2...R:h8# (2021-02-10)
A.Buchanan: I think the composer simply forgot that wPb7 can promote. Most of the cooks come from S promotions, but it's also possible to have QR. I've fixed it, rejigging the captures to make them still add up. I've posted in Discord, as I did with the partner composition, and will create entries for them here. (2022-03-15)
milan: +sLb8 sBa7=sT M.Frelih (2023-12-02)
A.Buchanan: Hi Milan - I don't think your suggestion quite works for b). In a) there are 0+2 spare captures, so Black can certainly cross-capture. But in b) there is 1+1 so neither side can cross-capture, so there is no solution. Please compare with P1399806, in which there are 1+2 & 2+1 spare captures, so both twins are sound. (2023-12-03)
milan: Hi Andrew my correction works only with 2.1... solutions, black or white knights on a5. are not important. (2023-12-03)
A.Buchanan: Hi Milan not really clear what you are doing, but if as well as the piece changes you proposed, you also change the stipulation to 2.1... then there is still only one solution. Even if you remove Sa5 entirely as well, there is no White cross-capture possible. (2023-12-04)
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Keywords: Castling (wgsk), Cant Castler (wgsk), Cross-capture (s,w), Superseded by (P1399806)
Genre: h#, Retro
Computer test: Popeye v4.87
FEN: 4k2r/pPp2p1R/n1pB1ppp/npP5/1P6/5PPP/2P2P2/R3K3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-12-03 more...
3 - P0008537
Michel Caillaud
615v Europe Echecs 452 01/1997
P0008537
(14+9) C+
BP in 21,5
1. d3! Sc6 2. d4 Se5 3. dxe5 Sf6 4. exf6 Tg8 5. fxg7 f6! 6. gxf8=S Tg3 7. hxg3 f5 8. Th6 f4 9. Td6 exd6 10. Se6 Dh4 11. Sc5 Dh3 12. gxh3 h6! 13. Lg2 h5 14. Lc6 dxc6 15. Kf1 Le6 16. Kg2 Lb3 17. axb3 0-0-0 18. Ta6 Td7 19. Tb6 a6! 20. Sa4 a5 21. Ta6 c5 22. Ta8#
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Vladimir Rey: C+ Natch 3.2 - Solution found: 1. Positions analysed: 51578. Resolution time: 5 h 33 mn 32.84 s. (2020-05-08)
Vladimir Rey: Check please: Keywords Tempo Loss. (2022-09-05)
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Keywords: Unique Proof Game, Castling, Tempo Loss (Bbb), Non-standard material (S), Cross-capture
Genre: Retro
Computer test: Natch 3.2
FEN: R1k5/1ppr4/3p4/p1p4p/N4p2/1P4PP/1PP1PPK1/1NBQ2N1
Reprints: H14 FIDE Album Annexe 1995-1997 2004
Input: Gerd Wilts, 1997-01-02
Last update: A.Buchanan, 2020-05-08 more...
4 - P1000920
Unto Heinonen
R063c Probleemblad 09-10/2000
2. Preis
P1000920
(12+8)
BP in 18,5
1. a4 b5 2. axb5 Sa6 3. Txa6 d5 4. Tg6 hxg6 5. b4 Th3 6. La3 Tg3 7. hxg3 Sh6 8. Txh6 Lh3 9. gxh3 gxh6 10. Lg2 Lg7 11. Le4 Lc3 12. dxc3 a5 13. Kd2 dxe4 14. Kc1 e3 15. De1 Dd1+ 16. Kb2 0-0-0 17. bxa5 Td3 18. Ld6 exd6 19. cxd3
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5 Überkreuzschläge von Bauern.
Henrik Juel: Natch 3.1 did nothing in half an hour (2018-12-14)
paul: Correction of P1000629 (2022-10-12)
comment
Keywords: Unique Proof Game, Castling (sg), Cross-capture (5)
Genre: Retro
FEN: 2k5/2p2p2/3p2pp/PP6/8/2PPp1PP/1K2PP2/1N1qQ1N1
Reprints: feenschach 153, p. 195, 10-12/2003
H28 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-10-12
Last update: Alfred Pfeiffer, 2018-12-20 more...
5 - P1003984
Kostas Prentos
R0097 StrateGems 18 04-06/2002
2. Lob
P1003984
(11+12) C+
BP in 17,0
1. d4 c6 2. Dd3 Db6 3. Dg6 Db3 4. axb3 hxg6 5. Ta6 Th3 6. Tb6 Tg3 7. hxg3 axb6 8. Th7 Ta2 9. Lh6 gxh6 10. e3 Lg7 11. La6 Le5 12. c4 Ld6 13. Sc3 La3 14. bxa3 Txf2 15. Sge2 d5 16. Kd2 Lh3 17. gxh3 bxa6
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4mal Überkreuzschlag (wBBa2b2 und g2h2, sBa7b7 und g7h7).
paul: The first 16.5 moves are unique (Euclide 0.96) (2010-07-05)
Henrik Juel: Natch 3.1 did not even find the solution in an hour (2018-12-16)
Moldenhauer: Computerprüfung: nachrichtlich C+ Stelvio 1.6 nach ca. 520 Std.
Natch 3.3 hat hier noch einen klaren Vorteil.
Stelvio wird ja weiter verbessert, wie ich bemerkt habe. (2023-10-02)
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Keywords: Unique Proof Game, Cross-capture (4)
Genre: Retro
Computer test: KP: C+ Natch 3.3 (24 hours 32 min) I stopped Stelvio 1.0 after 93 hours of testing
FEN: 1n2k1n1/4pp1R/ppp3pp/3p4/2PP4/PPN1P1PP/3KNr2/8
Reprints: (89) Die Schwalbe 250A 08/2011
Input: Gerd Wilts, 2002-04-05
Last update: A.Buchanan, 2023-03-20 more...
6 - P1339612
Roberto Osorio
Jorge Joaquin Lois

R496 The Problemist 2015-2016
1. ehrende Erwähnung
The Problemist 2015-2016
P1339612
(11+14) C+
PG in 20.5
1. c4 d5 2. Db3 Lf5 3. Db6 axb6 4. Sh3 Ta3 5. Tg1 Tc3 6. a4 e6 7. a5 Ke7 8. a6 Kf6 9. a7 Le7 10. a8=D Df8 11. Da4 Txc1+ 12. Dd1 Tc3 13. Ta6 Tf3 14. gxf3 bxa6 15. Tg6+ hxg6 16. Sg1 Th3 17. Db3 Tg3 18. Lh3 Kg5 19. De3+ Kh4 20. Dh6+ gxh6 21. fxg3+
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Judge's comment [Silvio Baier]: "Two cross-captures with the same type of captured pieces (QR) are combined with a cross-capture of two black rooks. This is not the highest number of cross- captures in an orthodox proof game (see e.g. P1003984 for comparison), but the pairs are very harmonious and the additional white Q-Pronkin is difficult to implement, and especially the motivation of the promotion of Pa2 is very deep. The check in the diagram position does not detract, since g2-g3+ is also possible with respect to pure retroanalysis."
A.Buchanan: Great problem, but I disagree with the last sentence in Silvio's comment. The alternative at the end g2-g3+ would force an obtrusive bishop. If the composers could have figured out how to do this without the final check, they obviously would have. (2017-09-18)
Henrik Juel: I also like this proof game very much
It seems the kind of problem that is most readily solved by hand; the missing [Lc1] and the missing black rooks might prompt the suspicious solver to consider cross-captures
Euclide did find the solution, but after a long time, and he was not able to verify uniqueness within an hour (2017-09-18)
Moldenhauer: Computerprüfung: C+ Stelvio 1.4 00:01:28 Minute. (hh:mm:ss)
Wegen Retraktion, keine Überprüfung auf 20.0. (2023-07-17)
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Keywords: Unique Proof Game, Cross-capture (DT,DT,tt), Ceriani-Frolkin Theme (D), Impostor (ppppPP)
Genre: Retro
Computer test: Stelvio 1.4
FEN: 1n3qn1/2p1bp2/pp2p1pp/3p1b2/2P4k/5PPB/1P1PP2P/1N2K1N1
Reprints: The Problemist , p. 5, 03/2017
Input: A.Buchanan, 2017-09-18
Last update: Silvio Baier, 2023-08-15 more...
7 - P1340215
Roberto Osorio
Jorge Joaquin Lois

R470 The Problemist vol.24-8, p. 341, 03/2014
after Satoshi Hashimoto
Lob
The Problemist 2013-2014
P1340215
(15+9)
PG in 18.5
1. d3 g5 2. Lxg5 Lg7 3. Dd2 Lc3 4. Sxc3 c5 5. 0-0-0 Dc7 6. Sb1 Dg3 7. hxg3 h6 8. Txh6 b6 9. Te6 Th3 10. gxh3 Lb7 11. Lg2 Lf3 12. Sxf3 Sf6 13. Th1 Se4 14. Dd1 Sd2 15. Kxd2 fxe6 16. Ke1 Kf7 17. Lc1 Kf6 18. Sg1 Ke5 19. Lf1
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Judge's comment [Thomas Brand]: "This elegant proof game seems me original enough compared with Hashimoto's Probleemblad 1999, 3rd Prize, (PDB P1000642), even though the theme is not doubly set. The only missing white man is a Rook captured at e6, but Ra1 could not leave home."
Henrik Juel: The white plan is obvious, and Black ensures uniqueness by putting his men to be captured on squares, where White can go anyway, and by a late king's walk
This proof game is an enjoyable solving object showing that man can beat the computer; Euclide was still trying to find a strategy (a list of moves, possibly infeasible, that leads to the diagram position), when I had solved the problem and written the present lines...
You might call Pg3,h3 impostors also, as well as Th1 (2017-09-27)
Moldenhauer: Computerprüfung: C+ Natch 3.3 in 5 Std. 57 Min. nur obige Lösung
BP in 17.5 keine Lösung. (2022-09-05)
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Keywords: Unique Proof Game, Impostor (TPP), Switchback (SLDKLS), Cross-capture (gh)
Genre: Retro
FEN: rn6/p2pp3/1p2p3/2p1k3/8/3P2PP/PPP1PP2/1NBQKBNR
Reprints: R470 The Problemist vol.25-8, p. 347, 03/2016
Input: A.Buchanan, 2017-09-27
Last update: Alfred Pfeiffer, 2019-06-03 more...
8 - P1399805
Giuseppe Brogi
Andrew Buchanan

Discord Chess Problems & Studies Server 15/03/2022
GB, correction AB
P1399805
(8+14)
h#2
b) sSa1 -> wS
a) 1. T2xh3 Txh3 2. 0-0 Th8#
b) 1. La4 0-0 2. Tf8 Te1#
play all play one stop play next play all
Colour of Sa1 is irrelevant to forward play, except for castling rights. Ignoring these retro concerns, there are two candidate solutions.
Suppose that both castling rights remain. Then sTh2 is original sTa8, and black b&c & white g&h pawn pairs have both cross-captured. However White has made 1 visible pawn capture, Black 6. In (a) this leaves 2+1 unaccounted for; in (b) 1+2. So at most one side can have cross-captured, so in each twin just one side can retain castling rights, allowing just one candidate to work in each.
Corrects P0000899. See P1399806, a companion problem.
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comment
Keywords: Cant Castler (wksk), Castling (wksk), Cross-capture (s,w)
Genre: h#, Retro
FEN: 4k2r/p2p1Np1/1pp2p2/1b3p2/8/p4PPP/B4P1r/nn2K2R
Input: A.Buchanan, 2022-03-15
Last update: A.Buchanan, 2023-04-01 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (5)
A.Buchanan (3)