Die Schwalbe

4 problem(s) found in 8080 milliseconds (displaying 4 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT CPLUS AND K='Rochadeparadoxon'] [download as LaTeX]

1 - P0001136
Edgar Fielder
The Fairy Chess Review 1941
P0001136
(13+10)
Darf Schwarz rochieren?
Schwarz hat bereits rochiert!
play all play one stop play next play all
See P1398939
Henrik Juel: Black captured b7xLc6 and axbxc; White captured [Lf8], e2xd3, and fxexdxc6xb7-b8=D.
Ke8 to b7, Th8 to b8, Kb7 to g8, Tb8 to f8, Da4 to b8 for unpromotion, -22.c6xDb7 Da8 -23.d5xLc6 Dd8 -24.d4 Lb7 -25.e3xTd4 Lc8 -26.f2xSe3 c6 -27.h5 b7xLc6, Lc6 to f1, f2xSe3 etc.
Black may not castle, because he already did.
It is not possible to avoid the early castling:
-11... Ka7 -12.Db4 Ka6 -13.Db8 Ka7 -14.D=b7 Kb8 -15.c6xDb7 Kc8 -16.d5xLc6 Kd8 -17.d4 Ke8 -18.e3xTd4 Da8 -19.f2xSe3 Dd8 -20.h5 Lb7 -21.h4 Lc8 and two white pawn retractions are missing (2012-07-23)
Yoav Ben-Zvi: The solution does not require a full analysis since if Black King and Rook never moved then Black is almost immediately in retro-stalemate. An alternative stipulation is "First move of Black King?". (2014-06-03)
A.Buchanan: Maybe there is intentional irony? (2014-06-03)
Henrik Juel: Nowadays composers are not afraid to use the real stipulation in this type of resolution retro, like 'Release the position'.
Formerly a formal stipulation was popular, like 'Mate in 1', with the real stipulation understood but not mentioned.
Here, the stipulation question may well be ironic, but you will get no solution points, if you just answer 'No'; you still need to explain how the position arose (2014-06-03)
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Keywords: Castling (sk), Castling Paradox (sk hidden)
Genre: Retro
FEN: 4k2r/2pppppp/7P/2p5/Q1P5/PPRP4/RBpP2P1/N1K5
Reprints: 71 32 personaggi e 1 autore 1955
12 Europe Echecs 12 08/1959
222 FIDE Album 1914-1944/III 1975
341 Eigenartige Schachprobleme , p. 110, 2010
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-02-23 more...
2 - P1385599
Michel Caillaud
MatPlus.net Forum 12/01/2021
P1385599
(15+14)
PG in 8.0
Staugaard castling
b) 1. e4 d5 2. e5 Dd6 3. exd6 Kd7 4. dxe7 Kc6 5. e8=T Kb6 6. 0-0-0-0-0-0 Lg4 7. Kf4 Lxe2 8. Kg3 Lc4
play all play one stop play next play all
Objective: Objective: Staugaard (Pam-Krabbé) rook is captured.
Henrik Juel: solution
1.e4 d5 2.e5 Dd6 3.exd6 Kd7 4.dxe7 Kc6 5.e8=T Kb6 6.0-0-0-0-0-0 Lg4 7.Kf4 Lxe2 8.Kg3 Lc4
Hidden castling (2021-01-21)
A.Buchanan: Thematic Ceriani-Frolkin seems a great way to conceal P-K castling! But normally wK returns to e1 in hidden castling. Absence of P-K in engine makes it harder to verify soundness of implausible moves like that. (2021-01-22)
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Keywords: Unique Proof Game, Staugaard castling, Ceriani-Frolkin Theme (T), Castling Paradox (hidden P-K), Promotion (T), Prentos Theme (T)
Genre: Retro, Fairies
FEN: rn3bnr/ppp2ppp/1k6/3p4/2b5/6K1/PPPP1PPP/RNBQ1BNR
Input: A.Buchanan, 2021-01-21
Last update: Rainer Staudte, 2021-05-10 more...
3 - P1398939
Edgar Fielder
Andrew Buchanan

Discord Chess Problems & Studies Server 07/022022
EF, version AB
P1398939
(13+10)
h#1
R: 1. Dg4-g3 Kd8-e8 2. Dg5-g4 Kc8-d8 3. Dg6-g5 Kb7-c8 4. Df6-g6 Tb8-h8 5. De6-f6 Kc8-b7 6. Dd6-e6 Kd8-c8 7. Dc6-d6 Ke8-d8 8. Db6-c6 Kf8-e8 9. Da7-b6 Kg8-f8 10. Db7-a7 Te8-b8 11. Db8-b7 Tf8-e8 12. b7-b8=D 0-0 13. c6xDb7 Da8-b7 14. d5xLc6 Dd8-a8 15. d4-d5 Lb7-c6 16. e3xSd4 Lc8-b7 17. f2xSe3 c6-c5 18. h5-h6 b7xLc6 is one of many possible histories, but all involve hidden castling
play all play one stop play next play all
Retro solution (which works for Fielder's original too).
Pawn captures: white missing LSBf, captured by axbxc,bxc. Therefore wBf captured at least 3 times fxexdxc, also exd & sLf8 died at home. So one missing black unit unaccounted for currently.
Cage can only be unlocked by exd3, but wLf must be returned home prior to this. Can only be uncaptured by sBb7xLc6-c5. If wPf did not promote, it was captured by sBa on b6 after 5 captures or on c5 after 4 captures. The latter is not possible, as wBc4 never left its file. The former is not possible, because sD would be unavailable for capture until b7xc6, which only happened after the cage was formed.
Therefore wBf promoted, and must have captured four times to reach b-file, accounting for the final capture. When it promoted on b8, sBb had already moved, capturing wLf and therefore the cage was already formed. So wDg3 is the promoted unit. If wBexd3 was capture of sLc, then there is deadlock between the two releases of bishops, so sLc was captured by wBf, hence path to promotion shifted to light squares (i.e. via c6 not b6) so sBc5 was already in place. When b7-b8=D, all the other White pieces (except possibly for wPh6, bK & bRh8) were already in place.
There is now a time-critical retraction, as White has at most 7 moves (not 9, because must release wRh before wLf is free) before sBb7xLc6, with sD & sLc sealed inside. So R: 1. b7-b8=D ~ 2. c6xDb7 zB Da8-b7 3. d5xLc6 Dd8-a8 4. d4-d5 Lb7-c6 5. e3xSd4 Lc8-b7 6. f2xSe3 c6-c5 7. h5-h6 b7xLc6. Where was bK while all this was happening. There is only one spare tempo (h4-h5) If bK was off the back rank, there was not enough time to retract back there. So the only possibility is that Black was already castled, and can uncastle when the black cage is closed. The missing move can be R: 1. ... 0-0.
Since castling is illegal in the forward play, h#1 is unique with Donati theme as wQ revisits the promotion square:
1. c6 Db8# not
1. 0-0? Dxg7#
cheeky retro-active version of P0001136
A.Buchanan: Looking at the original, I am wondering why wBh cannot be on h5. It clearly cannot retract to h3, but how many times is it needed to retract if White retracts from the critical position 1Q3rk1/2pppppp/8/2p4P/2P5/PPRP4/RBpP1PP1/N1K5 (2022-02-07)
A.Buchanan: Maybe the distinguished composer felt that the more spare White moves has, the more creditable is the fact that Black had no way to avoid prior castling. The problem is still sound either way. Of course, with the h#1 version, wBh6 is mandatory. wD location was pretty much arbitrary in the original, but now there is only one wD location for soundness: g3. (e5 & g4 are unsound). (2022-02-07)
A.Buchanan: The solution given in Keym’s wonderful “Eigenartige Schachprobleme” uses an unnecessary move by wPh. (2022-02-23)
A.Buchanan: In offering this version, I do not think that pure retros are in anyway inferior to forward problems, which was perhaps the motivation for forward stipulations in the days of yore. Rather, the aesthetic tension between past and future never tires for me. It is not an issue to me whether the balance of interest in a retro-active problem be equally divided between the two directions. Rather, it’s essential that the position have two readings: that the pieces have two purposes. This formal requirement of double meaning which is ubiquitous and quotidian in a cryptic crossword should also find a place near to the hearth in chess problems. So Morse might welcome Dexter. (2022-02-23)
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Keywords: Cant Castler, Castling Paradox (hidden sK), Donati Theme (wD), Castling in the retro play (wk)
Genre: h#, Retro
Computer test: Substantial retro thinking to show castling illegal + trivial v4.87 for forward play
FEN: 4k2r/2pppppp/7P/2p5/2P5/PPRP2Q1/RBpP2P1/N1K5
Input: A.Buchanan, 2022-02-07
Last update: A.Buchanan, 2023-08-15 more...
4 - P1401482
Janko Furman
Ljubomir Ugren

British Chess Magazine 1971-72
2nd Prize
P1401482
(15+9)
ser-h#7 (AP)
1. fxg3ep 2. 0-0 3. Txf5 4. Kf8 5. Ke8 6. Tf8 7. Th8 Lh5#
play all play one stop play next play all
The sole Black pawn capture was gxh so White made 6 pawn captures in files a-f (even though bPd & bPe are missing). One missing Black unit was not captured by a pawn: what happened? Spot that wPb4 must have captured from c3, and wPa4 from b3. Then have two more captures axb & bxc. Meanwhile there are also two captures on e&f files. So bPd was waylaid!
White's last move must have been g2-g4 to permit bPg3xQh2 to be undone, so ep is on if Black retains 00 rights, demonstrated by castling in the forward play.
Henrik Juel: 1.fxg3ep 2.0-0 3.Txf5 4.Kf8 5.Ke8 6.Tf8 7.Th8 Lh5#
Another 'uncastling' (2022-05-27)
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Keywords: a posteriori (AP) (Type Petrovic), Castling (sk), En passant as key, Castling Paradox (hidden), Seriesmover
Genre: Retro, Fairies
FEN: 4k2r/7p/8/4NPB1/PPP1KpP1/pprPP2P/1RpNBR1p/8
Input: A.Buchanan, 2022-05-27
Last update: A.Buchanan, 2023-01-29 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (1)
A.Buchanan (3)