Die Schwalbe

145 problem(s) found in 1757 milliseconds (displaying 100 problem(s)). [COMMENTDATE>=20220810 AND K='En passant' AND NOT COOKED ] [download as LaTeX]

1 - P0000058
Leonid M. Borodatow
5758v Die Schwalbe 103 02/1987
P0000058
(13+9) C+
h#3
b) sBa6 statt sLa6
a) 1. ... exf6ep 2. 0-0-0 Lxf4 3. Td7 a8=D#
b) 1. ... Kxf4 2. Te7 e6 3. Tb8 axb8=D,T#
play all play one stop play next play all
Anton Baumann: Mattdual in b): 3.Tb8 axb8=D,T# (2022-12-16)
A.Buchanan: So Borodatow got it all working! In a) Black might have captured hxgxf and axPb. So castling rights might still be maintained with the ep. In b) on the other hand, it must be axb, bxa, exf and wPgxh6, so there was the cage. Promotion to TD is tolerated in the final move, although it may not be puristic, without the convention, too many mates would be excluded (2022-12-16)
comment
Keywords: En passant as key, Castling (sg), Cant Castler, Valladao Task
Genre: h#, Retro
Computer test: HC+ Popeye v4.87 & basic retro thinking
FEN: r3k3/P7/b3r1pP/4PpBP/3nnpKR/5PRB/5PP1/7N
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-12-16 more...
2 - P0000250
Nikita M. Plaksin
Valery Liskovets

7577v Die Schwalbe 132 12/1991
P0000250
(5+14)
ser-h#5 (AP)
Typ Tauber/Caillaud
1. Kd4 2. bxc3ep (zuletzt nur K,T-Zug oder c2-c4) 3. e5! (nicht 4. Tb4? weil zuletzt K,T-Zug und 0-0-0 nicht mehr möglich) 4. Tb4 (zuletzt e7xLd8=S möglich) 5. Tc4 & 1. 0-0-0# nicht 1. Td1#? wegen fehlender AP-Legalisierung
play all play one stop play next play all
"das zeigt die Paradoxie der AP-Bedingung!" (MS). Gleich 1. bxc3 ep.? und dann 2. Kd4 geht natürlich nicht, weil zuvor außer K,T-Zug und c2-c4 auch S-Züge und c3-c4 möglich waren. "Interessanter und genau abgestimmter Lösungsverlauf" (GW) "Sehr schöne und ökonomische Verbindung zwischen konsequentem sh# und AP!" (TB) Mit 'Typ Tauber/Caillaud' ist gemeint, daß die einzelnen Stellungen doch als retroanlytischer Gesamtkomplex betrachtet werden dürfen/sollen (sonst wäre keine AP-Legalisierung möglich), obwohl sie ja aufgrund der retroanalytischen Neubewertung nach jedem Rückzug voneinander unabhängig sind. 6L./5+5P.
A.Buchanan: "By 'type Tauber/Caillaud' it is meant that the individual positions may/should be regarded as a retroanalytic overall complex (otherwise no AP legalization would be possible), although they are independent of each other due to the retroanalytic reassessment after each retraction." (2023-06-29)
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Keywords: Castling (wl), a posteriori (AP), Promotion (S), Seriesmover, Consequent, En passant
Genre: Retro, Fairies
FEN: 1N6/1ppppppn/n7/1Pq1k3/1pP1r3/4p3/1r6/R3K3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-06-29 more...
3 - P0000254
Leonid M. Borodatow
7642 Die Schwalbe 133 02/1992
P0000254
(16+10)
Welches waren die letzten 7 Einzelzüge, wenn dabei keine Zugwiederholungen vorkamen?
R: 1. 0-0-0# Ke4-d4 2. e5xf6ep+ f7-f5 3. Tg6-b6+ Kf5-e4 4. c7-c8=L
play all play one stop play next play all
Die von einigen Lösern angeführte Abweichung 2. f5-f6+ Kd4-e4 3. Lh6-g7+ (und mehrdeutig weiter) ließe sich durch die Erweiterung '... keine Zugwiederholungen und keine Pendelzüge ...' (mühsam) kitten. Beim Autor hieß es bei dieser ich-weiß-nicht-wie-vielten Fassung nur 'letzte 9 (!) Einzelzüge ohne Wiederholung).
HHS meint ohnehin, daß es das ganze auch ohne die einengende Zusatzbedingung schon gibt.
Das von einem Löser angegebene 1. Ld3-h7# Th1-h8 2. Lh8-g7 Tg1-h1 3. Se1-g3 g2-g1=T 4. Th7-h8=L scheitert allerdings an der Schlagbilanz.
Anton Baumann: Neufassung vergl. P0006288 (2023-01-06)
comment
Keywords: En passant, Last Moves?, Non-standard material, Castling (wl), Promotion (L), Valladao Task (WWW)
Genre: Retro
FEN: qrB2brr/Bp2p1BB/pR3P2/1Q6/2Pk1P2/B1p2R2/2P3N1/2KR1N2
Input: Gerd Wilts, 1995-06-03
Last update: Rainer Staudte, 2019-08-11 more...
4 - P0000324
Josef Haas
8259 Die Schwalbe 143 10/1993
P0000324
(7+5)
a) Wer setzt in 1 Zug matt?
b) Auf welchem Feld muß ein schwarzer Bauer eingefügt werden, damit die andere Partei als in a) mattsetzt?
b) (+sBc7) 1. ... Lg8xe6#
a) 1. Tg6#
1) R: 1. ... Kg6xBf6! 2. g5xf6ep++ f7-f5 3. La2-b1+
play all play one stop play next play all
"Vermutlich aus der Kleinkunstkiste des Autors hervorgekramt.
a) sollte einfach formuliert sein: 'Matt in 1 Zug' - denn wie es hier heißt, klingt es als ob nur einer mattsetzen kann. Das aber ist nicht der Fall, denn beide können's: 1. ... Lxe6# und 1. Tg6#. Üblicherweise hat Weiß das Prae und kann darauf pochen, den Schwarz hat einen altklassischen letzten Zug: 1. ... Kg6xBf6! (nebst 2. Bg5xBf6ep++ Bf7-f5 3. La2-(x)b1)" (HHS);
also ist Weiß am Zug und setzt matt mit 1. Tg6#.
b) Nach Einfügen eines sBc7 geht die o.g. Rückzugfolge nicht, weil der wK nicht auf die 8. Reihe gelangen kann. Also Schwarz am Zuge und 1. ... Lxe6#
"Allzubekanntes - kein Problem für Schwalbelöser" (HHS)
Wenn das alles so bekannt ist, erstaunt doch sehr, daß nur drei Löser die Autorintention nachvollziehen konnten. Alle anderen Löser (5) kamen zu genau entgegengesetzten Erkenntnissen (in a) setzt Schwarz matt, in b) Weiß), was wohl durch die nicht ganz konventionelle Formulierung suggeriert wurde. Ich find's ein interessantes Beispiel für Massenhypnose! (GL) 2/I/3L.
vergl. P0004915 (Hans Gruber, Schach 1979)
Brassaud: La solution proposée 1/Tg6# est possible
Mais il y a aussi le rétro jeu -1) Fa2-b1, Rg5g6 -2) Ta4-a5+, Rf4-f5 etc … et avec le trait aux noirs : 1) Fxe6 # est possible (2017-08-30)
A.Buchanan: @Brassaud: yes I agree. There is no reason why White should not have moved last. So both players can mate, but part (b) implies that the intended solution in (a) is 1 player. If the published stipulation for (a) was maybe just "#1", which by default is white to move, then there is a unique solution.
For (b) I am wondering about +sBg6, which would also stop the en passant trick, both by blocking sK from retreating there and also by locking sL in an impossible cage with sBf7. (2017-08-31)
Henrik Juel: Adding a black pawn on g6 of course prevents a black last move by Kf6, but it allows f7xg6 as last move; Lg8 is not locked, because Ph7 is white (2017-08-31)
A.Buchanan: Yes (2017-08-31)
Anton Baumann: vergl. P0004915 (Hans Gruber, Schach 1979) (2023-01-03)
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Keywords: Add pieces, No legal last move for Black, En passant in the retro play
Genre: Retro
FEN: 4K1br/1p4pP/4Pk2/R7/3P4/8/8/1B4R1
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2023-01-03 more...
5 - P0000758
Gerd Rinder
1033 Die Schwalbe 21 06/1973
1. Preis
P0000758
(7+11)
Remis (AP)
Weiß ist patt. 1. cxb6ep ist nur zulässig, wenn Schwarz diese a posteriori durch die Rochade rechtfertigt. Weiß kann aber so spielen, daß Schwarz nicht rochieren kann, z.B. 1. ... Lxc7 2. bxc7
play all play one stop play next play all
Guus Rol: This is an incorrect interpretation of the AP-convention. Rules outrank goals in the definition of all GAMES. Therefore the legitimacy of a move cannot be restricted by the desire to achieve the goal (in this case: Remis). The proper way to view AP is that executing e.p. invalidates the legitimacy of all lines of future play that do not contain 0-0-0! In that sense black and white are forced to cooperate. In whatever freedom remains they can compete for the prize promised in the stipulation. By the way, this understanding of AP is not only more logical, it is also much more interesting as a playing field for AP-composition. (2005-09-21)
mri: citeWeiß kann aber so spielen, daß Schwarz nicht rochieren kann, z.B. 1. ... Lxc7 2. bxc7
/cite
How does white prevent black from castling after 1. cxb6 e.p. Ba7xb6+?
E.g. 2.Kxb6 a1=R 3.a7 Rxa7, or 2.Ka4 Bd8xc7 3.a7 Bb8. (2005-09-22)
VL: 1.c5xb6ep(??) a7xb6+ 2.Kxb6 a1R 3.Kb7 R1xa6 4.Rc8! (R6a7#?? illegal).
This study is correct under the generally accepted understanding of AP
a la' N.Petrovic'. Antiform (looking possibly somewhat strange):
Black's unsuccessful try. (2005-10-03)
Guus Rol: Generally accepted, true. Generally acceptable, false. Freedom of interpretation ceases for a concept once its polar concept (a priori validation) has been defined. "Goal induced AP" however, might be a passable stipulation for this type of problem. To keep this place from turning into a discussion forum I will discontinue comments on this issue. (2005-10-03)
paul: Author intention is: If black still can castle, his last move must have been b7-b5. However, to prove this, he has to castle (A Posteriori condition). So: 1.cxb6 e.p. axb6+ 2.Kxb6 a1R! (2...a1Q? 3.Kb7 Qxa6 mate obviously doesn`t prove b7-b5 as the last move) 3.Kb7 R1xa6 4.Rc8! and white has prevented black from castling. So black can`t prove the last move is b7-b5 and therefor is already stalemated in the initial position! (2011-07-12)
A.Buchanan: Isn't Guus' idea just AP-Prioritat? And even if it were "more logical" or "more interesting", it doesn't follow that other forms is AP are "incorrect" (2023-07-31)
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Keywords: En passant as key, Castling (sg), a posteriori (AP)
Genre: Retro, Studies
FEN: r2bk3/p1Rpp3/P1p2p2/KpP2P2/1P2p3/1P6/p7/8
Reprints: (4) Problem 161-164 11/1973
317 Europe Echecs 217 01/1977
(A) Die Schwalbe 80 04/1983
408 Eigenartige Schachprobleme 2010
M36 mpk-Blätter 12/2011
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-07-31 more...
6 - P0000772
Klaus Wenda
1419 Die Schwalbe 30 12/1974
4. ehrende Erwähnung
P0000772
(4+7)
Weiß nimmt 1 Zug zurück, dann #2
b) sBh7 nach b6
a) R: 1. Kd5-e4, dann 1. Kd6
b) R: 1. dxc6ep, dann 1. d6
play all play one stop play next play all
In a) ist die s0-0-0 nicht mehr möglich, weil sich das Schach durch den sLg8 nur durch Kf7(x)e8 erklären läßt, in b) muß mindestens einer der sTT via e8 auf seinen Diagrammplatz gelangt sein.
In a) Entschlagdual R: Kd5xBe4, das wurde in der Lösungsbesprechung noch kritisiert und als NL vermerkt. Hat das der PR gelassener gesehen ('geduldeter Entschlagdual'), oder gibt's noch eine korrigierte Version dieses Problems?
Anton Baumann: Korrektur in 'Die Schwalbe' 12/1975 S.422: +sLh2, +sBe5;
nun geht in a) nur noch zurück: Kd5 x Be4.
Ausgezeichnet wurde gem. Preisbericht in 'Die Schwalbe' 06/1977 S.82 die korrigierte Version 1419v. (2022-12-08)
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Keywords: Castling (sg), Help retractor, En passant in the retro play, Cant Castler (sl)
Genre: Retro
FEN: r3k1bR/pr1p3p/2P5/8/2B1K3/8/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-02-10 more...
7 - P0000819
Josef Haas
1893 Die Schwalbe 40 08/1976
1. Preis
P0000819
(9+6)
#1 vor 4 Zügen
VRZ, Typ Hoeg
R: 1. Kh3xBg3 hxg3ep+ 2. g2-g4 Ke6xBd6 3. exd6ep+ d7-d5 4. Sc4-b6, dann 1. Sd6#
play all play one stop play next play all
Henrik Juel: It is illegal for Black to supplement anything on b6, because [Ta8] was captured in its corner and the other missing black men were captured by white pawns (2016-03-28)
Henrik Juel: ... as wLb3 is a pawn promoted on e8 or g8
Nice type Høeg defensive retractor
Here are some other explanatory comments
In retraction 1 White chooses to move his king back to h3; Black could choose to supplement a black man on g3 (or nothing), but supplementing a pawn is the only way to maintain legality (Kh3 stands in double check from Lc8 and Dh8); again moving Pg3 back to h3 and White supplementing a pawn on g4 is forced (this e.p. case is the only one where the supplementing does no happen on the abandoned square)
In retraction 2 the white retraction is forced, and then moving Kd6 back to d7 to uncheck is illegal because of the double check from Sb6 and Pc6, so Black must uncheck by moving Kd6 back to e6 and White choose to supplement a pawn on the abandoned square
In retraction 3 White chooses to move Pd6 back to e5, forcing another e.p. situation (2023-04-08)
Henrik Juel: The Proca type is easy to define: White and Black alternate retractions, until White can mate with a forward move
The Høeg type is usually defined the same way, except that the other side decides which man (if any) was captured; but this can be detailed as follows:
1. White chooses a man and 'moves it back'
2. Black chooses which man (if any) to 'supplement' on the abandoned square
(only now is the white retraction complete)
3. Black chooses a man and 'moves it back'
4. White chooses which man (if any) to 'supplement' on the abandoned square
(only now is the black retraction complete)
etc. etc. until, following a white retraction, White can mate with a forward move
In tries, Black can ruin the white plan by mating White with a forward move after a black retraction
It goes without saying that the resulting retractions must be legal
'supplement' is my (poor) translation of the danish term 'supplere'; maybe 'add' would be better
'the abandoned square' needs a special interpretation in the e.p. case, which happens twice in this problem
These details may be the cause why new type Høeg defensive retractors are rarely seen, as type Proca is more natural and straightforward (2023-04-08)
A.Buchanan: Thanks Henrik. Yesterday, I went through all the defensive retractors to clear up keywords & genres. There were a very few where the stip did not specify the VRZ Type, and others where Anticirce did not specify Calvet vs Cheylan. The answers are probably obvious to you, and if you want to comment on those, then I will update the stips & keywords.
A more general question: Typ Friedlich appears to be the German for Type Pacific: can we standardize on one? (2023-04-08)
Henrik Juel: Thanks Andrew for enabling me to post my type Høeg spiel once again
Anticirce without specification usually means that both Calvet and Cheylan work
Friedlich is indeed german for Pacific, and as the PDB is a german product, I guess we must live with the present conditions (2023-04-08)
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Keywords: En passant, Promotion, Defensive Retractor, Type Høeg
Genre: Retro
FEN: 2b4q/1p2p3/pNPk4/8/8/1B2R1K1/1P2PP1P/8
Reprints: feenschach 42 04-07/1978
345 Europe Echecs 241 01/1979
(5) Die Schwalbe 163 02/1997
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-07 more...
8 - P0001270
Matti Arvo Myllyniemi
142 Europe Echecs 84 01/1966
P0001270
(15+15) C+
BP in 9.5
1. e3 d5 2. Lc4 d4 3. Se2 d3 4. 0-0 dxc2 5. d4 Kd7 6. d5 Kd6 7. Dd4 Sd7 8. Ld2 c1=L 9. Lb4+ c5 10. dxc6ep+
play all play one stop play next play all
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Keywords: Unique Proof Game, En passant, Non-standard material (l), Castling (wk), Promotion (l), Valladao Task (sww)
Genre: Retro
Computer test: Ergänzung Stelvio 1.2 C+: Keine Lösung: BP 8.5, 9.0. 10. dxc6ep++ Doppelschach.
FEN: r1bq1bnr/pp1npppp/2Pk4/8/1BBQ4/4P3/PP2NPPP/RNb2RK1
Reprints: 92 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-25 more...
9 - P0001420
Branko Koludrovic
294 Europe Echecs 197 04/1975
1. ehrende Erwähnung
P0001420
(13+12) C+
h#3*
1. ... cxd6ep 2. 0-0-0 0-0-0 3. Kd7 Sa7#
1. De7 c6 2. Th8 c7 3. Tf8 Sd6#
play all play one stop play next play all
White pawn caps: axb,dxe,gxf,hxg.
Black: fxg,bxc,cxb.
wPb4 came from b3 to release wBa3, so bPb3 captured to reach that square.
All pcs accounted for means bPd never captured.
In the set play, there are 13 retro tries in which one or both players do not castle. The intention is that both castling rights are needed in order to imply the pawn double hop.
A.Buchanan: White pawn caps: axb,dxe,gxf,hxg definite.
Black: fxg and two to resolve c-file. But that may be c&d cross-capture, so in set play last move might have been c6xd5. So I think this problem is cooked. What am I missing? (2022-03-21)
Mario Richter: If Black's last move was c6xd5, how do you get white Bishop a3 out of his cage? (In that case, black pawn b7 never left the b-file). (2022-03-21)
A.Buchanan: I agree Mario thanks (2022-03-21)
Hans-Jürgen Manthey: beide Rochaden und im Satz ep. ist möglich:
R.: 1. ... d7-d5 2. Sa7-b5 b5xTc4 3. Tg4-c4 Dd8-h4 4. c4-c5 Th8-h3 5. c2-c4 c4xDb3 6. Dd3-b3 h3-h2 7. Dd1-d3 h4-h3 8. Sc8-a7 h5-h4 9. Th4-g4 c5-c4 10. Th1-h4 h7-h5 11. h2xSg3 Sf5-g3 12. b3-b4 Sh6-f5 13. Lb4-a3 c7-c5 14. Ld2-b4 g3-g2 15. Lc1-d2 a3-a2 16. a2xSb3 Sc5-b3 17. Lb3-a4 Sa6-c5 18. Lc4-b3 Sb8-a6 19. d2xLe3 Lc5-e3 20. Ld3-c4 Lf8-c5 21. Lf5-d3 a4-a3 22. Lh3-f5 a5-a4 23. Lf1-h3 g4-g3 24. g2xLf3 Lb7-f3 25. Sb6-c8 Lc8-b7 26. Sa4-b6 a7-a5 27. Sc3-a4 b7-b5 28. Sb1-c3 f5xSg4 29. Se5-g4 Sg8-h6 30. Sf3-e5 e7-e6 31. Sg5-f3 f6-f5 32. Sh3-g5 f7-f6 33. Sg1-h3 (2023-02-23)
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Keywords: a posteriori (AP) (Type Petrovic), En passant as key, Castling (wgsg)
Genre: h#, Retro
Computer test: HC+ Popeye v4.87 & retro-logic.
FEN: r3k3/6p1/4p3/1NPp4/BPp4q/Bp2PPPr/pP2PPpp/R3K3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-03-21 more...
10 - P0001937
Werner Kuntsche
6025 Schach , p. 191, 06/1969
2. Preis
P0001937
(4+12) C+
h#2
1. exd3ep Lxg4 2. f3 Le6#
play all play one stop play next play all
Klären: Quelle = Schachmatt? - Felber, Volker: SCHACH ist korrekt, 6/1969, Seite 191 (2010-10-09)

Eliminierung von 4 Steinen zwischen sK und wT im h#2 (mit Hilfe von ep-Schlag)!
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Keywords: En passant as key
Genre: h#, Retro
Computer test: HC+ Popeye 4.61
FEN: 8/8/8/1pn4b/2kPpppR/2q1rB1p/1p4r1/3K4
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-01-09 more...
11 - P0001970
Thomas R. Dawson
26 Schachkongress Teplitz-Schönau im Oktober 1922 1923
P0001970
(13+13)
h#1
1. exf3ep Lc2#
R: 1. f2-f4 f5xTe4 2. Tg4-e4 & e.g. f6-f5 3. Tg1-g4 f7-f6 4. Le4-h7 h5-h4 5. Lg2-e4 h6-h5 6. Lf1-g2 h7-h6 7. g2xh3
play all play one stop play next play all
1.exf3e.p. Bc2# is the only possible solution, but this necessitates R: 1.f2-f4. Can we prove this?

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

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

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

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

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

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

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

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

"Version 'Pittsburgh Leader' 08.06.1913"
Yoav Ben-Zvi: Appears as the first problem (D445) in the booklet on Dawson's RA problems by G.P. Jellis. The obstruction that occurs in the Try -1.Pf3-f4?, by WP of WB, is described as "obstruction of passage square". It is not considered by Dawson and his disciples to be a Retro opposition. Dawson's conception of RO was quite broad, it included cases where the interference was not by occupation of the target square, so the only valid reason that I can see to exclude this case is that the 2 pieces involved are both of the same color. Fabel's definition explicitly excludes "Monochrome RO". I conclude that it would be preferrable to interpret RO as a bi-chromatic interference. The keyword Retro opposition should be removed. (2018-04-07)
A.Buchanan: To my mind, RO involves some kind of parity-tempo issue between the sides, not just some kind of race-tempo. If it was just about "bi-chromatic interference", one might say that bPe4 blocks wBh7 from an immediate retreat, so it has to be wPf4 that retreats first, legitimizing the ep key. So I agree this is not RO. (2024-01-06)
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Keywords: Last Moves?, En passant as key
Genre: h#, Retro
FEN: nqb5/1rrpp1pB/KRp5/1p4B1/kN2pP1p/2P1P2P/PP2P2P/8
Reprints: D445 Retro-Opposition & Other Retro-Analytical Chess Problems 1989
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-06 more...
12 - P0002100
Adolf Norlin
v Tidskrift för Schack , p. 34, 01/1907
P0002100
(13+10)
#2
1. exf6ep+!
play all play one stop play next play all
Version in der 'Aarsskrift' 1935 innerhalb eines Artikels von K. Hannemann "Et Tema Fra den Retrograde Analyse". Im Original wDg4 statt h3 und wBh3 statt h4.
Henrik Juel: 1.exf6ep+. Not -1... a6?, requiring 3 black captures on light squares (incl. orig. Lf1); but missing orig. Lc1 was dark-squared. (2004-03-08)
Henrik Juel: C+ Popeye 4.61 and analysis (2022-06-11)
Hans-Jürgen Manthey: mögliche Zugfolge:
1. f2-f4 d7-d5 2. c2-c3 d5-d4 3. c3xd4 c7-c5 4. h2-h4 c5-c4 5. b2-b4 Lc8-d7 6. a2-a4 Ld7-b5 7. a4xLb5 Sb8-a6 8. Th1-h3 Sa6-c5 9. d4xSc5 Sg8-f6 10. d2-d4 Sf6-e4 11. c5-c6 Se4-g3 12. Lc1-d2 Se4xLf1 13. Sb1-c3 Sf1-g3 14. Sc3-a4 Sg3-e4 15. c6-c7 Ke8-d7 18. Sa4-c5+ Kd7-d6 19. Sc5-a6 Se4-c5 20. b4xSc5+ Kd6-e6 21. Ld2-a5 b7-b6 22. Sa6-b8 b6xLa5 23. Th3-e3+ Ke6-f6 24. Te3-e5 Dd8-c8 25. Dd1-d3 Dc8-a6 26. Dd3-h3 Da6-b6 27. Ta1-a3 Db6-c6 28. Ta3-g3 Dc6-d6 29. Te5-d5 Dd6-e6 30. c7-c8L De6-d6 31. Lc8-f5 Dd6-c6 32. Sg1-f3 Dc6-b6 33. Sf3-e5 Db6-a6 34. Se5-g6 Da6-b6 35. Sg6xTh8 Db6-c6 36. Tg3-g6+ h7xg6 37. Ke1-f2 Dc6-d6 38. Kf2-g3 Dd6-e6 39. Kg3-g4 De6-d6 40. Lf5-c2 Dd6-c7 41. b5-b6 Dc7-e5 42. f4xDe5+ Kf6-e6 43. Kg4-g5+ f7-f5 und nun :
1. e5xf6ep+ Ke6xTd5 2. Dh3-d7# (2023-02-24)
comment
Keywords: En passant as key
Genre: Retro
FEN: rN3b1N/p3p1p1/1P2k1p1/p1PRPpK1/2pP3P/7Q/2B1P1P1/8
Reprints: 58 Retrograde Analysis 1915
Aarsskrift DSK , p. 14, 1935
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2022-06-11 more...
13 - P0003100
John Derek Beasley
Cambridge 1985
P0003100
(3+8) C+
h#2
Zeroposition
a) -sBe4
b) -sSf5
a) 1. Sg3 Kxh4 2. Le4 hxg3#
b) 1. hxg3ep Kh4 2. Lf5 hxg3#
play all play one stop play next play all
Henrik Juel: in a) last move could be Kg2-h3
in b) last move must be g2-g4 (2024-01-14)
more ...
comment
Keywords: En passant as key, Zeroposition
Genre: h#, Retro
Computer test: HC+ Popeye 4.61 & trivial retro-logic
FEN: 8/7b/8/4pn2/4pkPp/4pp1K/7P/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-15 more...
14 - P0003138
Branko Koludrovic
4208 Problem 12/1979
P0003138
(11+9)
h#3 (AP)
0.1...
1. ... axb6ep 2. 0-0-0 0-0-0 3. Td7 a8=D#
play all play one stop play next play all
This problem can be solved presuming that both castlings are executable. It implies that the last halfmoves have been.-1.Bb6xa7 sBb7-b5.
Bb5 could not come from c6 (sBc6xFb5), because all of the missing white pieces(5) have been captured on white squares except wLc1,which must have been captured by Bc7(Bc7xwLb6).Further,it has not played immediately before -1.Bb6-b5 because this would prevent white castling(forcing wT or wK to move)
Here is the proof that 4 remaining white pcs have been captured on white squares:
black d-pawn must have been captured on d4 and h,g f pawns had to promote after Bh3xwFg2,then wBh2moved to h4, enabling Bg4x Fh3 ..h1T, and finnaly sBf7
after fxg2... g1S. sLf1 prevented the check from Th1, and later has been captured by a white officer.
Conclusion:
Retro:-1.wBb6xFa7 Bb7-b5
Forward(AP) 1....axb6 e. p.2.0-0-0 0-0-0 3.Td7 a8Q# (Author)
Branko Koludrovic: P.S.
The black pawn a4(on the diagramm)came from c7 after capturing the white bishop on b6, then moving to b5 and capturing a white officer on a4. (2010-09-28)
A.Buchanan: I think sBf must have captured on g2 & then promoted on f1 to S, otherwise it’s impossible to unlock the southeast cage (2023-07-11)
A.Buchanan: So that means it’s sound. However I don’t see that it needs to have been sL shielding on f1 (2023-07-11)
more ...
comment
Keywords: a posteriori (AP), En passant as key, Castling (sgsgwg), Promotion (D), Valladao Task
Genre: h#, Retro
FEN: r3k3/P3p3/p7/Pp6/p6P/2P3PR/2PPP2b/R3K1nr
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-07-11 more...
15 - P0003142
Marco Bonavoglia
3652 Sinfonie Scacchistiche 01-03/1982
P0003142
(6+5) C+
h#2
b) +sTd4
a) 1. Sxb4 Sxc3 2. Ka5 Sxc4#
b) 1. cxb3ep Sc4 2. Sb4 Sxc3#
play all play one stop play next play all
Henrik Juel: In a) last move could be Kb2-a1 (2022-12-05)
more ...
comment
Keywords: En passant as key, Cant ep, Zilahi
Genre: h#, Retro
Computer test: HC+ Popeye 4.61
FEN: 8/8/8/1P6/kPp5/N1p5/n1pP4/KN6
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-12-06 more...
16 - P0003194
Tivadar Kardos
1597 Schachmaty 05/1963
P0003194
(6+14) C+
h#2
1. cxd3ep? bxc3 2. Lxf4 Lxg2# Last move not d2-d4
1. gxf3ep! bxc3 2. Lf4 Lf5# Last move f2-f4
play all play one stop play next play all
White's last move was certainly one of the two double pawn hops. The last move couldn't be d2-d4 because Black's pawns had already captured 10 of White's pieces, and playing d2-d4 would have resulted in wBc1 being White's 17th piece. So, the only solution is 1.gxf3 e.p.
Viktoras Paliulionis: The last move couldn't be d2-d4 because Black's pawns had already captured 10 of White's pieces, and playing d2-d4 would have resulted in wBc1 being White's 17th piece. So, the only solution is 1.gxf3 e.p. (2023-12-30)
A.Buchanan: Yes that's right! (2023-12-31)
comment
Keywords: En passant as key
Genre: h#, Retro
Computer test: HC+ Popeye C-Version 4.87 & trivial retro-logic
FEN: 2n1q3/5prp/5K1b/3b4/2pPkPp1/2p1p1pB/1P4pP/8
Reprints: 546 FIDE Album 1962-1964 1968
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-12-31 more...
17 - P0003206
Hans Joachim Schlüter
4443v Schach , p. 349, 11/1963
P0003206
(5+8)
h#2
b) wTf1 tauschen mit wLg1
a) 1. Kxb4 Lb6 2. a4 Tb1#
b) 1. cxb3ep gxf3 2. Sc1 Tg4#
play all play one stop play next play all
Korrektur 1964, Seite 155: sBh3->f3
Henrik Juel: C+ Popeye 4.61 (2022-11-24)
comment
Keywords: En passant as key
Genre: h#, Retro
FEN: 8/8/8/p7/kPp5/p1p2p2/4n1Pp/5RBK
Input: Gerd Wilts, 1995-06-03
Last update: Felber, Volker, 2022-11-24 more...
18 - P0003207
Klaus Gerber
4497 Schach , p. 30, 01/1964
P0003207
(4+9) C+
h#3
1. exf3ep c3 2. Df7 Ke4 3. Dh5 exf3#
play all play one stop play next play all
A.Buchanan: Can shift bQd5 to c4, while replacing bRg5 with bP to reach Meredith status. bBh4 can also be downgraded to bP. But probably even more economy is possible by shifting pieces one file to the right, keeping the ep, White tempo & model mate, which seem to be the main features (2022-11-30)
more ...
comment
Keywords: En passant as key
Genre: h#, Retro
Computer test: HC+ Popeye 4.61
FEN: 8/8/8/3q2r1/2p1pPkb/4K1pp/2PrP3/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-11-30 more...
19 - P0003240
Gabor Tar
Magyar Sakkelet 06/1972
P0003240
(4+10) C+
h#2
b) sLe3 nach f3
a) 1. f3 Lxa7 2. Lg5 Lxf2#
b) 1. fxg3ep Lxc7 2. Lh5 Ld8#
play all play one stop play next play all
Henrik Juel: a) C+ Popeye 4.61
b) the ep capture is unjustified, last move could be Ke2-f1 or f3xg4 (2023-08-06)
A.Buchanan: There was an error in the stipulation: "b) sLe3 nach h2 (-wSh2)" is completely incorrect. However "b) sLe3 nach f3" leads to a very nice problem which matches the solution already present. This problem is not in WinChloe, but I am sure this is the resolution of the mystery (2023-08-07)
Henrik Juel: You are probably right, Andrew; maybe there was a misprint in the source
Now part b) is C+ Popeye 4.61 after very simple analysis (2023-08-07)
comment
Keywords: En passant as key
Genre: h#, Retro
Computer test: HC+ Popeye v4.61 & simple retro-logic for b)
FEN: 1B6/npp5/8/8/5pPk/4b2p/3p1p1N/5Kn1
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-08-07 more...
20 - 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
White captured fxg and promoted [Pd2] on d8
Black captured axbxa2-a1=Y, b7xc6, d5xe4, and gxf
White cannot have moved last, and in fact Black's last move can only have been f7-f5 in order to give White a prior move. R: 1... d5-e4 would have retro-blocked wPd marching to its promotion.
So the retroplay was R: 1... f7-f5 2.f5xYg6
Numerous retro tries but none distinct.
"Autor Ing. Rudolf Buljan, Zagreb"
AB: Have therefore marked him in the author table as Croatian. Yugoslavia has been removed from the PDB country list, I see.
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)
A.Buchanan: I think "Whose move?" is where there is no forward stip, or where we have to determine if the forward stip should be interpreted as orthodox or as half-duplex. "no legal last move for..." is where the mater/stalemater/etc is the usual one, but we add or remove a single move at the beginning of the forward stip. I guess a third possibility is "last move?" where in a Type A position we also have to figure out who moved last.
With respect, I don't think the level of analysis can be relevant. (2023-12-06)
more ...
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: A.Buchanan, 2023-12-06 more...
21 - P0003366
Laszlo Lindner
3040v Europe Echecs 07-08/1982
P0003366
(8+16)
h#2
b) sBc7 nach f6
a) 1. Dc4 Lxb6+ 2. c5 dxc6ep#
b) 1. fxe3ep Lxb4 2. Sc4 bxc3#
play all play one stop play next play all
Lindner in 'Mattbilder eines Lebens':
In a) ist die Lösung der stellung b) nicht möglich, weil das e.p.-Schlagen durch Schwarz nicht legal ist. Der letzte Zug von Weiß muß nicht unbedingt e2-e4 geweseb sein. Es kommt als letzter zug auch Kh3-g2 in Betracht, mit den vorherigen Zügen h4:g3 e.p.+ und g2-g4.
In b) demgegenüber sind Kh3-g2 und vorher f4:g3 e.p. illegal, weil die Rücknahme von g2-g4 unmöglich ist: der sB würde 7 Schlagfälle benötigen, und es fehlen nur 6 weiße Steine. Der letzte weiße Zug muß also e2-e4 gewesen sein.
In 'Mattbilder eines Lebens' abgedruckt mit sTh7 statt h8 und der Quellenangabe: Europe Echecs, 1964
AB: (1) Where is wK?
(2) Why is 1.fxe3ep legal in b) but not a)? (2002-01-31)
Henrik Juel: wK is probably on g2. In part a) last move could have been Kh3-g2, I think (2002-02-01)
A.Buchanan: Very convincing, Henrik. I've repaired the diagram accordingly. (2023-05-28)
comment
Keywords: En passant as key, En passant in the retro play
Genre: h#, Retro
FEN: 7r/2pn4/1nqRb3/B2Pp3/pb1kPp2/2p2Pp1/1PP2pKp/7r
Reprints: 501 Mattbilder eines Lebens , p. 379, 1996
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2023-05-28 more...
22 - P0003817
Jean Oudot
Nation Belge 1956
P0003817
(14+12) C+
#2
1. cxd6ep
play all play one stop play next play all
paul: Since the wB couldnt leave c1, the captured piece on b6 is the promoted wPh2. If last black move was f7-f5, then h-Pawn captured four pieces to promote on d8, among which bRh8, impossible. Thus, the h-Pawn could only have been promoted from f7 and therefore d7-d5 remains as the last move. (2011-07-02)
more ...
comment
Keywords: En passant as key
Genre: Retro, 2#
Computer test: C+ Popeye 4.61
FEN: qrRNkb2/PpQ1p1pp/1pp1R3/2PpKpP1/6N1/7B/1P1PPP2/8
Reprints: RA15 diagrammes 15 06/1975
(51) Mat Plus 12 10-12/2009
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-11-27 more...
23 - P0004479
Matjaz Zigman
Länderkampf Mazedonien-Slowenien 1969
6. Platz
P0004479
(10+13) C+
ser-h#5* (AP)
* 1. ... Lxd2#
1. dxe3ep 2. Txf2 3. Txg2 4. Th2 5. Th3 0-0#
play all play one stop play next play all
more ...
comment
Keywords: Castling (wk), Seriesmover, En passant as key, a posteriori (AP) (Type Petrovic)
Genre: Retro, Fairies
Computer test: HC+ Popeye 4.61 after analysis
FEN: 8/8/8/4pPp1/1p1pPkpb/1P1P2p1/pPpr1PP1/rbB1K2R
Reprints: 103 Bilten 1970 1971
(70) Problem 144-147 12/1971
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-07-20 more...
24 - P0009121
Tomislav Petrovic
2949 Phénix 69 12/1998
P0009121
(10+9) C+
h#2 (AP)
1. fxe3ep d8=S 2. Kxd5 0-0-0# (Td1#?)
play all play one stop play next play all
White has made 6 pawn captures with one missing black piece unaccounted for, that by parity can only have been captured by an officer. White's last move cannot have been a pawn capture. If R: 1.f2-f3, then sLg1 was promoted, implying 7 captures by black pawns - one too many. So if White can prove they retain castling rights, then the ep is on. Hence AP Petrovic is valid.
Henrik Juel: 0... fxe3ep 1.d8S Kxd5 2.0-0-0#. Not -1.f2? and Lg1 is caught. (2004-09-16)
Vaclav Kotesovec: Similar problems should not be labeled as "C+". Such a designation is only acceptable if the entire analysis was performed by a computer program. (2023-08-03)
Henrik Juel: In principle I agree, Vaclav
But PDB does not (yet) allow HC+, so I find it acceptable to use the C+ label, when you also tell the whole story after 'Computer test:' below (2023-08-03)
A.Buchanan: Hopefully Gerd will have more time at some point, and can expand the functionality in this and other areas. In the meantime, engine solving of conventional retros including AP, is in its infancy. Retractor 2 has some effectiveness, but is still basic. And there is nothing that yet grasps the intricacies of castling/ep etc. However AP problems do often contain considerable forward chess, and the C+ tag is very useful to filter out those that have already been solved forwardly, without pretending that these are in any sense fully solved (2023-08-04)
Ladislav Packa: I know the definition of AP, but I don't understand the logic behind it. The move 1.fxe3 e.p. proves that White CAN castling. But the solution (2. ...Rd1#?) claims that castling is MANDATORY. From my point of view, AP is correct when only castling is necessary for the solution and the Rook move would be a dual. (2023-08-04)
A.Buchanan: @Ladislav: I am not sure how to help you. Maybe you can read this page from Retro Corner: https://www.janko.at/Retros/Glossary/APosteriori.htm (2023-08-05)
Ladislav Packa: Andrew, what should the article help me with? I quote the final sentence:
Some people still oppose this rule and argue that it should certainly not be the default convention. (2023-08-05)
Henrik Juel: You could view it this way, Ladislav
h#2 means that it is Black to move, so White made last move
What was last move? A little analysis shows just three possibilities: f2-f4, move by Ta1, or move by Ke1
So normally we cannot assume that last move was f2-f4
But if White can castle, then the last move was f2-f4
So if we could start with 0... 0-0-0, then 1.fxe3ep would be legitimate
AP says that you are allowed to reverse the sequence of events; first do the ep capture, then later legitimize it by castling
Was this helpful? (2023-08-05)
Ladislav Packa: Henrik, you don't have to explain that to me. I've done a few AP issues myself, like P1348357. But that doesn't mean I agree with AP's logic. I already wrote it - the term "you can castle" is applied as "you must castle". But these are only problems where, in addition to castling, the Rook move can also be used, I consider that a dual.
From that point of view, the P1000662 issue is perfectly fine for me. (2023-08-05)
Joost de Heer: AP: By castling, you prove a posteriori that the ep-capture was not just a try but the actual solution. Without castling, the ep-solution just is that: a try.
So: Try 1. fe3 ep e8=S 2. Kd5 Rd1 - but ep capture not allowed, as there is no proof that f2-f4 must've been the last move.
Solution 1. fe3 ep e8=S 2. Kd5 OOO - Now the ep capture was justified because white castled, thereby proving that the last move before the diagram position indeed was f2-f4. (2023-08-06)
Joost de Heer: See e.g. P1052919 : The try is an ep capture which is unjustified. (2023-08-06)
A.Buchanan: OK Ladislav: I think I get your point. If one solution with castling justifies the e.p., then based on that certainty, why shouldn't an alternative solution with no castling *then* be allowed as well? There are problems in which one twin shows 0-0-0 and the other shows 0-0. Each is based on the other in a similar way, so the idea of dependency is not new. Why are we not allowed to add other "parasitic" solutions as well? Why can we only have the "paying" solutions? We can't say that we are restricted to one solution: that's not the way chess problems operate! And this is just in the help world - in the adversarial world it might get even more complicated. Is this your issue, Ladislav? (2023-08-07)
Ladislav Packa: I don't want to unnecessarily prolong this discussion. However, I will add one more note: in this position, white castling is also possible without e.p. in Black's 1st move. If B1 were an indifferent move, then white can 1...0-0-0! The Codex of Chess Composition writes about it in Article 16 (1):
Castling convention. Casting is permitted unless it can be proven that it is not permissible.
In our case, 0-0-0 is possible because White's last move exists - e2-e4! It does not matter if it is this move or some a2-a3, both moves are equivalent. EP does not prove the possibility of casting, it would be legal even without it. (2023-08-07)
A.Buchanan: Ladislav was what I wrote your issue pls? Y/N :-) (2023-08-07)
Ladislav Packa: I have no problem, I'm just expressing my own opinion about the AP convention. (2023-08-07)
A.Buchanan: OK cos I think the point I raised is a real one that should be addressed by theory some day. Clearly from the nice problem that you composed Ladislav you understand the mechanics very well. From a justification perspective it's all a bit iffy, but that's why it's controversial. Under RS it's really the only way one can end up actually eping, and it's proved compositionally fertile. So that's enough to justify (2023-08-08)
Ladislav Packa: No need to apologize. This is a normal discussion with different views on the issue. Maybe it will come to some conclusion.
I just want to point out the fact that it is not the e.p. that authorizes castling, because according to the Codex castling is possible regardless of the e.p. It's the exact opposite: castling authorizes the possibility of e.p. (2023-08-08)
Joost de Heer: "I just want to point out the fact that it is not the e.p. that authorizes castling, because according to the Codex castling is possible regardless of the e.p. It's the exact opposite: castling authorizes the possibility of e.p."
You misinterpret AP. The e.p. capture does not authorize castling, castling provides a justification later on (hence the 'a posteriori') for the legality of ep.
Usually, for ep justification you need to examine all game trees that lead to the diagram, and only if all game trees end with the double-step, then ep is allowed.
With AP, you examine all the game trees including the actual play. If all those game trees have as last move before the diagram position the double step, then ep is possible.
In this case, if white doesn't castle, then there are game trees which don't have as last move the double step, and therefore AP logic dictates that the ep capture was illegal. However, all game trees which lead to the diagram and which have castling in the actual play have as last move before the diagram position the double step, hence AP dictates that the ep capture is legal. (2023-08-09)
Ladislav Packa: Joost: A simple question - is white allowed to castle after any 1st move by black (except e.p.)? (2023-08-09)
Joost de Heer: Of course he is. AP only is used to combine the ep justification with castling, not the castling right per se. (2023-08-09)
more ...
comment
Keywords: a posteriori (AP) (Type Petrovic), En passant as key, Castling (wg), Promotion (S), Valladao Task
Genre: Retro, h#
Computer test: HC+ Popeye v4.87 + simple retro-logic
FEN: 8/3P2p1/2PP4/1ppPp3/2pkPp2/5PP1/6Pp/R3K1b1
Input: Gerd Wilts, 1999-02-27
Last update: A.Buchanan, 2023-09-11 more...
25 - P1000662
Gianni Donati
R074 Probleemblad 11/1999
P1000662
(10+14) C+
h#1.5 (AP)
1. ... gxh6ep 2. exf1=L 0-0-0#
play all play one stop play next play all
Kommentare:
Als einziger letzter schwarzer Zug, der die weiße Rochade
erhält, kommt nur Bh7-h5 infrage, was dem Weißen den e.p.-Schlag
ermöglicht, um nicht die Rochade oder das Mattnetz zerstören zu
müssen (H.P.Suwe)
Gianni Donati: This intends to show the Valladao theme in the minimum number of moves. (2004-03-19)
VL: The waiting ep capture. Cf. also P1000260
(by T.Petrovic, 2000) somewhat enriched
thematically with the illegal try 2... Rd1#??. (2004-06-03)
A.Buchanan: The “illegal try” 2. Rd1+ is not actually mate because c2 is unprotected. This is kind of “logic dual” spoils the A.P. motivation for the castling (2020-05-20)
Henrik Juel: White captured h6xg7 and once more, e.g. axPb-b8=Y
Black captured cxdxe, dxexf, fxg, and once more, e.g. a2xb1=Y
Possible retroplay 1... h7-h5 2.h6xSg7 Df8-f4 3.h5-h6 Sf4-h3 4.Sh3-g1 etc., preserving the castling right
Any other black last move would force White to retract Ta1, as d2xc3, d2xe3, and h6xh7 would be illegal retractions
I agree with Andrew that the double motivation of 2... 000# is a weakness:
a. legitimizing h7-h5
b. mating (2020-05-21)
Vaclav Kotesovec: Similar problems should not be labeled as "C+". Such a designation is only acceptable if the entire analysis was performed by a computer program. (2023-08-03)
A.Buchanan: See discussion at P0009121 (2023-08-04)
more ...
comment
Keywords: a posteriori (AP), En passant, En passant as key, Castling, Valladao Task, Promotion (l)
Genre: Retro
Computer test: HC+ Popeye v4.87 + simple retro logic
FEN: 6n1/4p1P1/6p1/6Pp/2b1rqrb/2PkPppn/1P2pP2/R3KRN1
Reprints: König & Turm (4), p. 28, 03/2001
H Problemkiste (143) 10/2002
(V2) Problemkiste 156 12/2004
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-08-03 more...
26 - P1007954
Peter Hoffmann
9345 Die Schwalbe 161 10/1996
P1007954
(10+7) C+
s#3*
*) 1. ... Lxe6 2. Sb3+ cxb3#

1. Td5! droht 2. Sd7+ Ka4 3. b3+ cxb3#
1. ... Lxe6 2. Sa4+ Lxd5 3. b4+! cxb3ep#
play all play one stop play next play all
Der Versuch mit der wD, 1.De5? scheitert an 1.- Sg4! - MS: Drei verschiedene weiße Züge erzwingen das Matt auf b3, witzig! - DrRJB: Gelungener Wechsel von Normal- zu e. ,p.-Schlag. - WW: Drohung und Lösung sind gut aufeinander abgestimmt, so daß ein Abspiel völlig ausreicht. - 2,8/II/4
more ...
comment
Keywords: En passant
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: 4B3/8/p2RQ3/k1N5/2p5/P1p2p1b/KP5n/RN2B3
Input: Gerd Wilts, 2003-06-29
Last update: Dieter Berlin, 2024-02-20 more...
27 - P1012015
Henri Nouguier
Jean-Claude Gandy
Jean Claude Dumont

diagrammes 1975
Lob
P1012015
(12+8) C+
#2
1. Sg5? droht 2. Sxf7#
1. ... f5!

1. dxc6ep! droht 2. Kb6#
1. ... bxc6+ 2. Kxc6#
play all play one stop play next play all
Le Fnf1 provient de la promotion du PNh7 (2 prises) après capture à domicile du Fbf1 (1 prise). bxc5, dxc5 ou dxe6 comme dernier coup N sont à rejeter puisqu'ils nécessiterait 2 prises supplémentaires. Le RN n'a pu venir de d6 au coup précédent car cela impliquerait exf8:F+ comme dernier coup B. Dans ce cas les PB auraient effectué 9 prises or il ne manque que 8 PN. Le RN n'a pu venir de f4 ou de f5 après fxe4 car la position des PB e2, f3 et g2 rendrait inexpli- cable la présence simultanée de la TB en f2 et du FN en f1. Le PNe6 ne vient pasde e7 car le FB n'aurait pu accéder à f8 et le PNc5 ne vient pas de c6 à cause de l'+ non paré au RB.
No. 1111 HN
Correction of P0003822
A.Buchanan: Odd that the correction has fewer composers than the cooked original (2023-05-27)
HENRI: To be corrected :
The third author Jean-Claude Dumont must be add as mentioned in the award 1975-1976 page 539 diagrammes n° 31 jan - feb 1978. (2023-05-30)
more ...
comment
Keywords: En passant as key
Genre: Retro
Computer test: HC+ Popeye 4.61 and (french) analysis
FEN: 5B2/1p3ppN/4p3/RKpPk3/3pP3/3P2P1/2P1PRP1/5b2
Input: Henri Nouguier, 2004-01-11
Last update: A.Buchanan, 2023-05-30 more...
28 - P1012052
Henri Nouguier
diagrammes 2004
P1012052
(9+15)
shc#6
1. dxc3ep 2. Kxb5 3. Kc6 4. Kd7 5. Ke8 6. 0-0 Txg7#
play all play one stop play next play all
Un des PNd a pris 1 pièce blanche. pour venir de e7. Donc les PB b, c et d ne peuvent se croiser. Le PBg6 ne peut venir de f5 car il faudrait 2 prises noires! Seule reste le dernier coup blanc 0... c2-c4 Ceci implique que le FNb1 est issue de promtion ! C'est le PNb7, il aurait pris 2 pièces blanches. Les PNg5 et h5 ont pris 2 pièces blanches.
No. 11661 HN
A.Buchanan: “Obvious promotion” is intended to refer to something visible in the initial diagram position, not what is reached during series play (2022-09-14)
A.Buchanan: Similarly “non-standard material (2022-09-14)
more ...
comment
Keywords: Seriesmover, Consequent, En passant as key, Promotion in the retro play (sLb1), Castling, Valladao Task
Genre: Retro, Fairies
FEN: 7r/5pnR/5PnR/1Pp2ppq/1kPp4/p2P4/P2pP3/Kbb4r
Input: Henri Nouguier, 2004-01-11
Last update: Mario Richter, 2022-09-14 more...
29 - P1017717
Vincent Lanius Eaton
The Cincinnati Enquirer 1930
P1017717
(7+5)
#2
1. d4! droht 2. dxc5#
1. ... c1=D,L+, 2. Sf4#
1. ... c1=S 2. Sc3#
1. ... cxd3ep 2. Txd3#
1. ... cxd4 2. Txd4#
play all play one stop play next play all
Henrik Juel: duals after 1... c1=T (2024-01-26)
comment
Keywords: Brian Stephenson Collection (2548), En passant (s), Provoked check, Promotion (sD,sL), Blocknutzung, discovered checkmate, double-check mate, Cross check
Genre: 2#
FEN: 3R4/8/8/2p3K1/2p5/5B2/R1pPNB2/1b1k4
Reprints: 90 The American Two-move Chess Problem , p. 55, 1965
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-01-26 more...
30 - P1017730
Lev Loshinsky
Die Schwalbe 1930
P1017730
(7+10) C+
#2
1. d4! droht 2. Dc5#
1. ... cxd3ep 2. Sxe3#
1. ... exd3ep 2. Sxc3#
1. ... Sge6 2. Txf5#
1. ... Sfe6 2. Txd7#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (2561), Herpai, En passant (zweifach, s), Line closing
Genre: 2#
Computer test: SCHRECKE: popeye 4.87
FEN: 3N1n2/K2b1Rn1/1Q6/p2k1q2/2p1pP2/2r1r3/3P4/3N4
Reprints: 45 Chess Problems: Introduction to an Art , p. 58, 1963
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-02-08 more...
31 - P1020144
Josef Kling
23 The Chess Euclid 1849
P1020144
(6+6)
#2
1. axb6ep+ Kb1 2. 0-0#
1. ... Da7 2. Kf2#
play all play one stop play next play all
in 'Le Pion' fälschlich wBa4 ("1 - R 1 R ... 5 - P 4 TD ...")

Nach heutigen Konventionen ist der Ep-Schlag unzulässig, man beachte aber:
Kling im 'Chess Euclid' zur Intention dieser Aufgabe: "This problem I have compossed expressly to shew the error the modern composers of problems have committed, in introducing the system of castling in the ends of games. In this problem I consider I have as good a reason to say that Black has just moved his Q. Kt. P. [b5] two squares as that White has not moved his K. R. or K."
James Malcom: I found this hidden ancient, another that rode the rails of the unjustified en passant key. (2020-12-28)
SP: Unsound in its own terms, as, whatever Black plays (Kb1/Qa7),
castling is never forced due to 2.Kf2#
I use the keyword "non-analytic en passant key" for such problems. (2023-08-21)
A.Buchanan: The composer's stated intention seems to be that (1) ep is ok (2) castling is not ok. In these terms, the problem is sound (2023-08-22)
comment
Keywords: Brian Stephenson Collection (4985), En passant as key, Castling (wk), En passant, Castling as mating move, Golden Age
Genre: 2#
FEN: R7/7q/7r/Pp6/5p1r/7P/4Q3/k3K2R
Reprints: 458 Dubuque Chess Journal 35 01/1873
P10 Le Pion 01/05/1873
Input: Brian Stephenson, 2004-08-12
Last update: A.Buchanan, 2023-08-22 more...
32 - P1029843
Renato di Vincenzi
Problemi di Scacchi Inediti 1998
P1029843
(9+6) C+
#2
1. f4! droht 2. Dd3#
1. ... gxf3ep 2. Dxe6#
1. ... Lxf4 2. Dxf4#
1. ... Kf3 2. Sd2#
1. ... Kf5 2. De5#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (14740), En passant (s), Blocknutzung
Genre: 2#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/8/1B1Qp1b1/6b1/2P1k1p1/6P1/2P2P1P/1N3Kn1
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-09-24 more...
33 - P1031326
Walter Henneberger
La Strategie 1908
Sp. Preis
Stratégie-Turnier 1908
P1031326
(11+10)
#3
1. Sf5! droht 2. Dh1+,Da6
1. ... Dxa1 2. c4+ bxc3ep 3. Sf6#
1. ... Lg1 2. e4+ fxe3ep 3. Sb6#
1. ... Tbxd3 2. c4+ bxc3ep 3. Da2#
1. ... Thxd3 2. e4+ fxe3ep 3. Dh1#
1. ... Dxe8 2. Sf6+ Ke6 3. Txe8#
1. ... Ta3,Tc3 2. Dh1+
play all play one stop play next play all
'DAZ'-Lösungsanalyse: "Den starken Drohungen des Schw. (Dxe8, Tb3-a3,h2-h1=D) kann Wß. nur durch starke Mattdrohungen begegnen. Als solche ergibt sich 1. Sd4-f5, was 2. Da1-h1+ und 2. Da1-a6 (--c6 oder b7) droht. Die stärkste Erwiderung ist natürlich Dh8xa1, worauf Sd7-f6 matt folgen könnte, wenn die D von der Deckung des Feldes f6 abgesperrt werden könnte. Das erreicht aber Wß. durch 2. c2-c4+, worauf Schw. b4xc3ep spielen muß und Sd7-f6 matt setzt. Nun hat Schw. gegen 2. Dh1+ auch die Verteidigung La7-g1, was auch die Fortsetzung 2. Da1-a6 (wegen Dh8-a1) ausschließt. Dann schließt aber Wß. durch 2. e2-e4+ f4xe3ep die L-Schräge und Sd7 gibt auf b6 matt. Nicht minder fesselnd gestaltet sich das Spiel, wenn Bd3 von einem T geschlagen wird: 1. ... Tb3xd3 2. c2-c4+ b4xc3ep 3. Da1-a2 matt und 1. ... Th3-d3 2. e2-e4+ f4xe3ep 3. Da1-h1 matt. In diesem Fall wird durch das erzwungene Kreuzen ['DAZ'-Sprechweise für "en passant-Schlagen"] der betr. T verhindert, zwischenzusetzen. Die Aufgabe, die also mittels des Kreuzens einmal die Sperrung zweier Schrägen, das anderemal die Sperrung einer seitlichen Turmreihe durchsetzt, ist ein Meisterwerk ersten Ranges."
'DAZ' gibt als Quelle "1. Preis Strategie-Turnier 1908" an.
F.Chlubna (s. Ndr. Vers.Schätze) gibt "Ehrende Erwähnung, La Stratégie 1908-09 " an. (db)
Henrik Juel: double threat and duals 1... Tb1 2.Da6,Da2+, 1... Tf3,Tg3 2.Dxh8,Da6, and others (2022-08-28)
comment
Keywords: Brian Stephenson Collection (16228), En passant, Queen sacrifice, Line closure, Rook sacrifice
Genre: 3#
FEN: K1R1R2q/b2N1p2/3p4/1P1k4/1p1N1pP1/1r1P3r/2P1P2p/Q7
Reprints: 118 Deutsche Allgemeine Zeitung 04/03/1922
71 Das Schachproblem , p. 61, 1937
181 Versunkene Schätze , p. 82, 1998
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-08-28 more...
34 - P1035188
Norman Alasdair Macleod
The Christian Science Monitor 1947
P1035188
(3+5) C+
#2
1. Kg2! droht 2. Txc8#
Nicht 1...0-0?? da der sK schon gezogen hat: R: 1. h4xg3ep+ g2-g4 2. Kd7-e8+,Kd7xSe8+,Kd7xTe8+
play all play one stop play next play all
BS Problemid: 20117
Authors: Macleod, Norman A
Sources:
Years: 1947
Mario Richter: vgl. mit P1012182 (2011-05-28)
more ...
comment
Keywords: Brian Stephenson Collection (20117), En passant in the retro play, Cant Castler
Genre: 2#, Retro
Computer test: HC+ Popeye 4.61 + trivial retro logic
FEN: R1b1k2r/1Q6/8/8/8/6pK/7b/8
Input: Brian Stephenson, 2004-08-12
Last update: A.Buchanan, 2024-02-27 more...
35 - P1036812
Cyril S. Kipping
Reading Observer 1912
P1036812
(13+6) C+
#2
1. e4+! Kc4+ 2. Sfxd6#
1. ... Kxe4+ 2. Sbxd6#
1. ... Kc5+ 2. Sbxd6#
1. ... Ke5+ 2. Sfxd6#
1. ... Kc6+ 2. Sbd4#
1. ... Ke6+ 2. Sfd4#

1. ... fxe3ep 2. Se7#
play all play one stop play next play all
F. Chlubna: Task von sechs Abzugsschachs durch den schwarzen König.
more ...
comment
Keywords: Brian Stephenson Collection (21754), Checking key, Task (Construction), Discovered check (sK - sechsfach), En passant (s), Cross check, Battery mates
Genre: 2#
Computer test: SCHRECKE: popeye 4.87
FEN: 3B4/1bP5/1n1r2P1/RN1k1N1R/B4pQ1/P7/2P1P2n/3K4
Reprints: 300 Chess Problems 1916
72 Versunkene Schätze , p. 37, 1998
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-10-11 more...
36 - P1037319
Henry Edwin Kidson
The Westminster Papers 1868
P1037319
(10+6) C+
#4
1. Lh2? Te6 2. Tg3+ Kf4!

1. Lc7! Te6 2. Ta8 Te3 3. Tf8 e5 4. fxe6ep# 3. ... Te4 4. Tg3# 3. ... Te5 4. Sxe5# 3. ... Te6 4. fxe6#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (22267), ambush, En passant (w), discovered checkmate
Genre: n#
Computer test: SCHRECKE: Gustav 4.2e
FEN: 8/4p3/7r/4BPp1/1PN3R1/1P1p1k1P/3Pp3/R3K3
Reprints: 18 The Week-End Problems Book , p. 172, 1932
341 Beispiele zur Ideengeschichte des Schachproblems , p. 82, 1982
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-20 more...
37 - P1037462
Samuel Gold
Schachaufgaben 1883
P1037462
(7+7)
#4
1. Td8! Kd5 2. Dxe6+ Kxe6 3. Lc4+ d5 4. exd6ep#
1. ... Kd4 2. Dxe6 Kc3 3. Da2 d5 4. exd6ep#
play all play one stop play next play all
Quelle: Schachaufgaben von Dr. S. Gold, 1883
Henrik Juel: double threat 2.Txd7,Dh4+ and dual 1... Kd5 2.Txd7,Dxe6+ (2023-08-10)
comment
Keywords: Brian Stephenson Collection (22410), En passant as mating move (zweifach), discovered checkmate
Genre: n#
FEN: 7R/2pp2B1/1p2pQ2/4Pp2/4k3/P3p3/4B3/7K
Reprints: IX Ungarische Schachproblem Anthologie , p. 57, 1983
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-08-10 more...
38 - P1037629
Ladislaus Cimburek
Deutsches Wochenschach 1909
4. Preis
Thema-Turnier
P1037629
(6+12)
#4
1. Db7! droht 2. Dxg7+ Kh5 3. Sxf6# 2. Lxg7+ ... Sxf6#
1. ... Le5 2. Se3 Dxe3 3. g4 hxg3ep 4. Dh1#
1. ... Dc3 2. Sf4 Lxf4 3. g4 hxg3ep 4. Dh1# 2. ... gxf4 3. Dxg7+ Kh5 4. Dg6#
play all play one stop play next play all
Henrik Juel: several duals, e.g., 1... Db2 2.Dxg7+,Se3 (2022-08-26)
comment
Keywords: Brian Stephenson Collection (22577), Knight sacrifice, En passant (schwarz)
Genre: n#
FEN: 2Q2B2/K5n1/pp1p1p1k/2pN1Pp1/7p/8/6Pb/1bq5
Reprints: 264 Versunkene Schätze , p. 115, 1998
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-08-26 more...
39 - P1042884
Johannes Kohtz
Carl Kockelkorn

1784 Schachzeitung , p. 157, 05/1864
Britisches Problemturnier
London Chess Congress 1862
P1042884
(8+6) C+
#4
1. Ta4! Lxa4 2. b4+ cxb3ep 3. Kb2 Lb5 4. Sdb7#
1. ... Lb3,Le2 2. Txc4+ Lxc4 3. b4#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (27851), Sacrifice key, En passant (s), Blocknutzung, Pawn mate
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 1n6/2Bp4/p2N4/N1k5/2p1P3/R1P5/1P6/1K1b4
Reprints: 53 Classic Chess Problems by Pioneer Composers , p. 31, 1970
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-02-17 more...
40 - P1044394
Benjamin S. Wash
? 1885
P1044394
(8+10) C+
#4
1. Ld1! Txg3 2. Sb4+ Lxb4 3. c4+ d4xc3ep 4. Lb3#
1. ... Tc6 2. Dxc6+ Kxe5 3. Dd6+
1. ... a5 2. Dxb6 Kxe5 3. Dd6+
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (29396), ambush key, En passant (s)
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 5n2/p1Q4n/1r2p2K/2BkN2B/3pp3/2b1r1P1/N1P5/8
Reprints: 37 Spectacular Chess Problems , p. 23, 1965
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-04 more...
41 - P1044825
Kenneth S. Howard
American Chess Bulletin 05-06/1938
P1044825
(11+9)
#3
1. d4! droht 2. d5+ cxd5 3. Lxd5#
1. ... d5 2. Lxc6 ... 3. Lxd5#
1. ... c4xd3ep 2. Da2+ d5 3. c5xd6ep#
1. ... e4xd3ep 2. f4 f5 3. e5xf6ep#
play all play one stop play next play all
Henrik Juel: duals 1... cxd3ep 2.Da2+,Lxc6 and 1... d5 2.Lxc6,Da4 (2022-12-22)
comment
Keywords: Brian Stephenson Collection (29830), En passant as mating move (zweifach), En passant (s zweifach), discovered checkmate (zweifach)
Genre: 3#
FEN: B4n2/3ppp2/1Np1k2N/2P1P3/2p1p2p/6B1/3P1P2/Q3R1K1
Reprints: 151 Spectacular Chess Problems , p. 61, 1965
122 Classic Chess Problems by Pioneer Composers , p. 70, 1970
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-09 more...
42 - P1044826
Kenneth S. Howard
American Chess Bulletin 07-08/1938
P1044826
(9+4)
#3
1. c6! droht 2. Te8+
1. ... De7+ 2. g5+ f5 3. g5xf6ep#
1. ... Dd6 2. Te8+ Kd5 3. Te5#
1. ... Dxg4+ 2. Lxg4+ f5 3. Te8#
1. ... Dxc3 2. Te8+ Kf6 3. Txf7#
play all play one stop play next play all
Henrik Juel: duals after 1... Df8,Db8 (2022-12-19)
comment
Keywords: Brian Stephenson Collection (29831), Cross check, discovered checkmate, pin-mate, En passant as mating move
Genre: 3#
FEN: 3R3N/2pR1p2/4k3/N1P5/1q4PK/2B4B/8/8
Reprints: 152 Spectacular Chess Problems , p. 61, 1965
119 Classic Chess Problems by Pioneer Composers , p. 69, 1970
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-09 more...
43 - P1051206
Joseph C. J. Wainwright
58 Mirror of American Sports 09/08/1884
P1051206
(7+5) C+
#3
1. d3! Kf5 2. e4+ dxe3ep 3. d4# 2. ... d5xe4 3. Db5# 2. ... Ke5 3. Db8#
1. ... g3 2. Dc1
1. ... Kd6 2. Db8+
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (36245), En passant, Flight-giving key, discovered checkmate, Line opening
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 8/5K2/4N3/3pk2n/P2p2p1/8/3PP1P1/1Q6
Reprints: 32 Spectacular Chess Problems , p. 21, 1965
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-04 more...
44 - P1051876
Gaston Balbo
? 1943
Lob
P1051876
(11+8)
#2
1. Td3! droht 2. Sc3#
1. ... Dxd2,Dxd4 2. Dxf3#
1. ... Lxd5 2. Lxd5#
1. ... f4 2. Sd6#
1. ... e5 2. dxe6ep#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (36916), discovered checkmate, En passant as mating move, Theme B2
Genre: 2#
FEN: BB2Rbb1/4p3/8/1N1P1pp1/1N1Pk3/1KR2r2/3P1qQ1/8
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-03-23 more...
45 - P1054065
Leonid Ivanovich Kubbel
51 The White Knights , p. 71, 1917
P1054065
(6+5) C+
#3
1. e6! g5 2. fxg6ep
1. ... gxh6 2. Kxh6
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (39111), Voraussperre (Schlüssel), En passant (w)
Genre: 3#
Computer test: SCHRECKE: popeye 4.89
FEN: 5N1k/4N1p1/7P/2p1PP1K/r2p4/8/8/8
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-03-08 more...
46 - P1057122
Wolfgang Pauly
Running the Gauntlet 1911
P1057122
(14+8)
#3
1. f3! Lxe3+ 2. d4+ c4xd3ep+ 3. Kb4#
1. ... Sxb2 2. d4+ c4xd3ep 3. Dxc3#
1. ... Sxe3 2. Sg7 ... 3. Lxc3#
play all play one stop play next play all
Henrik Juel: double threat 2.d4+,Lxc4 and duals after 1... Sdf2,Shf2,Lh2,Ke6 (2022-12-22)
comment
Keywords: Brian Stephenson Collection (42178), pin-mate (doppelt), Sacrifice of white pieces (S, L), Cross check, En passant (s), Discovered check (s doppelt)
Genre: 3#
FEN: 8/p4p2/2P2P1R/R1K1kN1P/2p5/2r1N1Pn/BB1P1P2/3nQ1b1
Reprints: 124 Classic Chess Problems by Pioneer Composers , p. 70, 1970
Wolfgang Pauly. Challenge of a Legacy 2001
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-12-22 more...
47 - P1057123
Alain C. White
Running the Gauntlet 1911
P1057123
(7+5) C+
#3
1. Dh6! Kd5 2. c4+ bxc3ep 3. Sxc3#
1. ... Kf5 2. g4+ hxg3ep 3. Sxg3#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (42179), Echo-Manöver, En passant (s, zweifach), Edge to edge (D, Schlüssel)
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 8/7p/8/4p3/1p2k2p/1K5P/2P1N1P1/2Q3B1
Reprints: 89 Spectacular Chess Problems , p. 40, 1965
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-17 more...
48 - P1058261
Walter Henneberger
Basler Zeitung 13/02/1905
P1058261
(9+4) C+
#3
1. h4! droht 2. Lxf4+ Kxf4 3. Sd3# 2. ... Kf6 3. Sd5#
1. ... gxh3ep 2. g4 fxg3ep 3. f4#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (43322), En passant (s doppelt), Drag-in sacrifice, Bishop sacrifice
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 7K/8/3p3N/4kBB1/1N3pp1/2P5/5PPP/8
Reprints: 469 Schweizerische Schachzeitung , p. 59, 04/1905
121 Classic Chess Problems by Pioneer Composers , p. 70, 1970
F The Problemist 24-11, p. 463, 09/2014
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-12-22 more...
49 - P1059072
Benjamin S. Wash
Huddersfield College Magazine 1879-1880
Ehrende Erwähnung
Informalturnier
P1059072
(9+9)
#3
1. Da3! droht 2. e4+ f4xe3ep 3. Dd3# 2. ... Kxe4 3. Sg5#
1. ... Txa3 2. e4+ f4xe3ep 3. Sg3# 2. ... Kxe4 3. Sg5#
1. ... Lxe2 2. Dxh3+ Lg4 3. Dd3#
1. ... Lf3 2. Dd3+ Le4 3. Dxh3#
play all play one stop play next play all
Henrik Juel: dual 1... Te3 2.Dxe3,Sxe3 (2022-12-19)
comment
Keywords: Brian Stephenson Collection (44137), Sacrifice key, En passant (s), Line closing, Drag-in sacrifice, Blocknutzung (zweifach)
Genre: 3#
FEN: 2B5/2p1pK2/Q2pN3/3Rbk1p/2P2pb1/7r/4P3/4BN2
Reprints: 29 Spectacular Chess Problems , p. 20, 1965
120 Classic Chess Problems by Pioneer Composers , p. 69, 1970
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2022-12-19 more...
50 - P1067164
Siegfried Hornecker
12437 Die Schwalbe 209 10/2004
nach N. Petrovic
P1067164
(10+12)
Weiß nimmt 1 Zug zurück und gewinnt
R: 1. 0-0, dann 1. fxg6ep
play all play one stop play next play all
SCHRECKE: Petrovic: P0001941 (2023-11-28)
comment
Keywords: En passant, Help retractor, Castling
Genre: Retro, Studies
FEN: b7/p4P2/n1kbPp1p/3ppPp1/4pp2/8/P1PPP2P/5RK1
Input: Gerd Wilts, 2004-11-06
Last update: A.Buchanan, 2023-11-28 more...
51 - P1068490
Kostas Prentos
Andrey Frolkin

13077 Die Schwalbe 219 06/2006
Werner Keym gewidmet
1. Preis
P1068490
(10+14) C+
BP in 26.0
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 h5 5. g4 Sh6 6. g8=L Lg7 7. g5 Ld4 8. g6 f6 9. Ld5 Lc5 10. Lc6 0-0 11. g7 Kh7 12. g8=T bxc6 13. Tg5 La6 14. Te5 fxe5 15. f4 Tf6 16. f5 Td6 17. f6 Lc4 18. f7 Lxa2 19. f8=D Le6 20. Df3 a2 21. Dd5 axb1=S 22. Ta2 Sc3 23. dxc3 cxd5 24. Kd2 d4 25. Kd3 Lf5+ 26. e4 dxe3ep+
play all play one stop play next play all
The first known example of the Keym Task.
Henrik Juel: Stelvio 1.31 found the solution immediately and tested it unique in 9 minutes (for the first 25.0 moves) (2023-06-13)
more ...
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (DTLs), Castling, En passant, Valladao Task, Promotion (LTDs), Allumwandlung, Keym Task (The first known prob)
Genre: Retro
Computer test: Natch 3.1 (38 m, utilizing the final ep). Stelvio 1.33, 2min (retracting the e.p. move itself, so full C+)
FEN: rn1q4/2ppp2k/3r3n/2b1pb1p/8/2PKp3/RPP5/2BQ1BNR
Input: Gerd Wilts, 2006-08-05
Last update: Reto, 2023-06-13 more...
52 - P1089433
Aleksandar Popovski
(I) Novi Temi 07/1962
2. ehrende Erwähnung
P1089433
(7+6) C+
s#2*
* 1. ... c3 2. a5 cxd2#

1. d3? c3!

1. d4! c3 2. Db2+ cxb2#
1. d4! cxd3ep 2. a5 d2#
play all play one stop play next play all
more ...
comment
Keywords: Changed continuation, Mehrvariante, En passant (s), Pawn mate (zweifach)
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: 8/1p3p2/1N3B2/1R6/Pbp5/1k6/2pP4/Q1K5
Input: Frank Müller, 2009-07-31
Last update: Dieter Berlin, 2023-11-22 more...
53 - P1095638
Andrej W. Borodulin
Sportklub Bogatyr Kriwoj Rog 1988
Spezielle ehrende Erwähnung (im Russ. Turnier)
P1095638
(12+6) C+
s#5
Zuletzt geschah zwingend e7-e5.
1. dxe6ep dxe6+ 2. Kf4 Ld7 3. c8=S+ Lxc8 4. Th8 Ld7 5. Td8 e5#
play all play one stop play next play all
more ...
comment
Keywords: Multiple publication, En passant as key, Stalemate dissolution
Genre: s#, Retro
Computer test: A. Baumann: Gustav 4.2a
FEN: 2b5/1pPp4/1P1k1P2/1B1PpKPR/1P2P1p1/4B1P1/8/8
Reprints: S1246 The Problemist 01/1989
6657 Die Schwalbe 08/1989
Input: Frank Müller, 2009-12-07
Last update: A.Buchanan, 2024-01-04 more...
54 - P1107661
M. Leclercq
L'Echiquier de Paris 1953
G. Authier gewidmet
P1107661
(10+4)
#2
1. dxe6ep
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 and very simple analysis (2022-11-16)
more ...
comment
Keywords: En passant as key
Genre: Retro
FEN: 5kn1/5p2/3N1PRP/1B1PpKB1/4RN2/8/8/8
Reprints: (10) Mat Plus 12 10-12/2009
Input: Gerd Wilts, 2010-06-13
Last update: Rainer Staudte, 2022-11-16 more...
55 - P1117177
Vladimir Kozhakin
M20 StrateGems 3 07/1998
P1117177
(4+3)
#3
1. b4+
play all play one stop play next play all
EPs B12L m
SCHRECKE: C+, popeye 4.87
1. b4+! cxb3 e.p. 2. Lc4 b2 3. Txa6#
1. ... Kb5 2. Lb7 c3 3. Lxa6# (2022-11-21)
comment
Keywords: Miniature Collection (0346739), Miniature, Checking key, En passant
Genre: 3#
FEN: 8/8/p4R2/k2B4/2p5/K7/1P6/8
Input: Zuncke/Bruder, 2010-09-11
Last update: Gunter Jordan, 2022-11-21 more...
56 - P1120833
Nikolay S. Zinovyev
13568 Ideal-Mate Review 90 04/2003
P1120833
(4+3)
#10
1. c4 b5 2. cxb5+ Kb6 3. Kb8 a5 4. bxa6ep Kxa6 5. Kc7 Ka7 6. Lb5 Ka8 7. La6 Ka7 8. b5 Ka8 9. Lb7+ Ka7 10. b6#
play all play one stop play next play all
BsL2 IM
SCHRECKE: C+, Gustav 4.2b, Brute Force (2023-02-16)
comment
Keywords: Miniature Collection (0328832), En passant
Genre: n#
FEN: K7/p7/kp6/8/BP6/2P5/8/8
Input: Zuncke/Bruder, 2010-09-11
Last update: Rainer Staudte, 2017-11-19 more...
57 - P1151678
Leonid Ivanovich Kubbel
23 Isbrannye sadatschi L. I. Kubbelja 1958
P1151678
(5+2) C+
#2*
* 1. ... e6 2. fxe6#

1. Kd4! Kd6 2. Dd8#
1. ... e5+ 2. fxe6ep#
play all play one stop play next play all
B3b EPw_ m NM
vf: a1<>h1, Edvard af Hällström, 1903, Nay Pressen
more ...
comment
Keywords: Miniature Collection (0021309), anticipated (P1142611), Provoked check, Mutate, Pawn mate, Flight-giving key, En passant as mating move
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: 5Q2/3kp3/1P6/3PKP2/8/8/8/8
Reprints: 78 Schachminiaturen Zweizüger , p. 27, 1965
Input: Felber, Volker, 2010-09-12
Last update: Rainer Staudte, 2023-01-20 more...
58 - P1154800
Paul Wenman
24 Problems and Puzzles 1944
P1154800
(3+4) C+
#2
1. f4!
play all play one stop play next play all
EPs
more ...
comment
Keywords: Miniature Collection (0310185), En passant, Miniature, Sacrifice key, Opferminimal
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: 8/8/2B5/5p2/4p3/8/5P1p/5K1k
Input: Zuncke/Bruder, 2010-09-12
Last update: Dieter Berlin, 2023-11-24 more...
59 - P1156452
Walter Freiherr von Holzhausen
109 Offiziers-Schachzeitung 11/1904
P1156452
(4+3)
#3
b) wTf3->e4
a) 1. Th3! (Zugzwang)
1. ... g4 2. Txh5,Th4 g3+ 3. hxg3#
1. ... h4 2. g4 hxg3ep+ 3. hxg3#

b) 1. h4! droht 2. hxg5 ... 3. Th4#
1. ... g4 2. Kg3 Kg1 3. Te1#
play all play one stop play next play all
B14f EPs mm
vf: b) von Aleksandr Oleinik, 21.02.1991, Sa ogneupory
Henrik Juel: a) has a dual after 1... g4
b) is C+ Popeye 4.61 (2023-06-19)
comment
Keywords: Miniature Collection (0055489), Miniature, En passant
Genre: 3#
FEN: 8/8/8/6pp/8/5R2/5KPP/7k
Reprints: 4 Illustriertes Wiener Extrablatt 12/03/1923
Input: Felber, Volker, 2010-09-12
Last update: Mario Richter, 2023-06-19 more...
60 - P1186029
Leonid Ivanovich Kubbel
La Strategie 05/1918
P1186029
(6+6)
s#2
1. f4 droht 2. Dxe4+ Lxe4#
1. f4 exf3ep 2. Ld8+ fxg2#
play all play one stop play next play all
SCHRECKE: C+, popeye 4.89 (2023-11-08)
comment
Keywords: En passant
Genre: s#
FEN: b7/2R3Np/6kr/6B1/4p3/8/5PQp/7K
Input: Frank Müller, 2011-01-29
Last update: Frank Müller, 2011-01-29 more...
61 - P1187251
Petko A. Petkov
74v Rex Multiplex 10-12/1982
J. Oudot in memoriam
Informalturnier 1982/83
1. Preis
P1187251
(12+11) C+
s#5
1. Tf8! droht 2. Te8+ Kf5 3. Tf6+ Kg5 4. Txg6+ Kf5 5. Le4+ Txe4#
1. Tf8 Te1 2. Lf6+ Kf5 3. g4+ fxg3ep 4. Lh4+ Ke5 5. Lxg3+ Tf4#
1. Tf8 Sc4 2. Tde6+ dxe6 3. Sf7+ Kf5 4. Sd6+ Ke5 5. Sxc4+ Txc4#
1. Tf8 g5 2. Te8+ Kf5 3. Se7+ Ke5 4. Sc6+ Kf5 5. Sd4+ Txd4#
play all play one stop play next play all
Korrektur in 10-12/1983, Seite 221
more ...
comment
Keywords: En passant, Batterie Typ Siers
Genre: s#
Computer test: A. Baumann: Gustav 4.2a
FEN: 3B2NN/3p3p/1P1R1RpP/1PKPk3/qr3p2/b4B2/1np3P1/6r1
Input: Frank Müller, 2011-02-14
Last update: Dieter Berlin, 2023-12-11 more...
62 - P1201388
Arthur Poplawski
Deutsche Schachzeitung , p. 319, 10/1888
P1201388
(15+14) C+
#2
1. e5xd6ep+
1. ... e5 2. Taxf7#
1. ... f6 2. Dxf6#
1. ... Kxf8 2. Dh8#
play all play one stop play next play all
'DSZ': "Die untenstehende Stellung theilt uns ein Herr A. P. in Zürich zur Veröffentlichung mit. Wir möchten jedoch noch an das Diagramm für unsere Löser eine Warnungstafel anhängen, wie man solchen häufig in zoologischen Gärten begegnet: 'Achtung, ich beisse!"
Henrik Juel: Black captured [Lc1] with an officer, and the black pawns never captured. White captured d3xLe4 and f2xSg3, so all seemingly possible last moves by Black fail because of an illegal check, except d7-d5.
1.exd6ep+ f6/Kxf8 2.Dxf6/Dh8# (2011-09-04)
Ladislav Packa: 1.-e5 2.Raxf7# (2011-09-04)
A.Buchanan: Why not R: 1. Kf6-g7 d4xe5+ (2020-07-05)
Kevin Begley: You can not legally retract -1.Kf6-g7 d4xe5+, when you consider the only two units black is missing are a light-squared bishop and a knight. The Knight must have been captured on g3 (light squared bishop can not die there). Nor can black's light-squared bishop have been captured on e5. (2020-07-05)
A.Buchanan: I shouldn't post before breakfast (2020-07-05)
Lutz Neweklowsky: The chess problem is o.k. , because the last 2 moves were : 1.fxNg3 Bf3e4 2.dxBe4 d5 and 3.e5xd6ep+ cheers Lutz Neweklowsky (2023-06-10)
more ...
comment
Keywords: En passant as key
Genre: 2#, Retro
FEN: 1n3R2/R3ppkp/p1N3Br/rpKpP1pP/q1p1P2N/1PQ3P1/P1P3Pb/8
Input: Mario Richter, 2011-08-27
Last update: Mario Richter, 2021-03-26 more...
63 - P1201545
Francis Charles Collins
104 A Selection of 107 Chess Problems [Collins] 1881
P1201545
(7+9) C+
s#3*
* 1. ... e6 2. Kc5 g2 3. c4 bxc3ep#
1. Kd5 e6 2. Kc5 g2 3. c4 bxc3ep#
play all play one stop play next play all
more ...
comment
Keywords: En passant, Wartezug
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: 8/4p3/1P6/p3B3/rpKnp3/bB2Q1p1/1kP5/6R1
Input: Frank Müller, 2011-09-01
Last update: Dieter Berlin, 2024-02-11 more...
64 - P1204382
Otakar Tot
639 Wiener Hausfrauen-Zeitung 12, p. 106, 22/03/1891
P1204382
(7+3) C+
#3
1. Dd7! Ke4 2. f4 gxf3ep 3. Te1# 2. ... Ke3 3. Dd3#
1. ... Kf6 2. Te1 Kg6 3. De6#
play all play one stop play next play all
more ...
comment
Keywords: Fluchtfeldwechsel, En passant (s), Blocknutzung
Genre: 3#
Computer test: SCHRECKE: popeye 4.89
FEN: 7K/8/8/4k2p/Q5pP/6P1/2P2P2/5R2
Input: Felber, Volker, 2011-10-09
Last update: Dieter Berlin, 2024-03-12 more...
65 - P1233676
Sergio Orce
5421 Problemkiste (136) 08/2001
P1233676
(12+10)
#2
(RV)
b) wBb3->b4
a) 1. Ke6! (0-0-0 illegal!) ... 2. h8=D,T#
b) 1. dxe6ep! 0-0-0 2. Dxb7#
oder 1. Ke6 ... 2. h8=D,T#
play all play one stop play next play all
a) 0-0-0 ist illegal. Die wBB haben 5-mal geschlagen, wBBf3/h3 also nicht.
-> sBf2h2 haben 3-mal geschlagen, entweder 3-mal auf schwarz oder nach Rücknahme von g2-g4
-> Lf1 ist nicht unter den Schlagopfern.
-> wBa2 mußte umwandeln. Falls 0-0-0 noch gehen soll, muß die UW auf h8 geschehen sein
-> letzter Schlagfall W×S ist sowieso klar
-> sBa7 muß als Schlagfall für wB dienen. Da e5 es selbst nicht kann, muß er umgewandelt haben, kann dazu aber nur wLf1 schlagen
-> Widerspruch. -> 0-0-0 ist illegal.
b) dito, aber es geht sBa7-a4xLb3-b1 usw.
-> 0-0-0 ist legal. Aber nur, wenn zuletzt e7-e5.
-> 1. dxe6ep, oder falls zuletzt sK/sT-Zug 1. Ke6.
-> "Retrovarianten" (RV) wohl besser als "A posteriori" (AP)
(Übersetzung, Anmerkung und Prüfung durch Hans Gruber).
A.Buchanan: The retro content here is fun, but I don't see why it's suggested that this is AP. (a) is a cant castler, and (b) is a standard PRA matrix. Removing AP as a keyword for this one. (2023-07-21)
comment
Keywords: Valladao Task, Castling, En passant as key, Partial Retro Analysis (PRA)
Genre: Retro, 2#
FEN: r3k3/1pp4P/3p2N1/2NPpK2/4QpP1/1P3PRP/4Pp1p/6n1
Input: Erich Bartel, 2012-03-04
Last update: A.Buchanan, 2023-07-21 more...
66 - P1239200
Rudolf Klatt
4267 Freie Presse (Chemnitz) 25/01/2002
Version Peter Heyl
P1239200
(6+7)
#4
1. d4? exd3ep!

1. f4! exf3ep 2. d4 cxd3ep 3. Df4+ Kc5 4. Sd7#
3. ... Ke7 4. Sc6#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2e, Brute Force (2023-09-27)
comment
Keywords: Line opening, En passant (2-fach), Model mate, Echo
Genre: n#
FEN: 1K2nN2/1n6/3k4/1p4Q1/1Np1p3/8/3P1Pb1/8
Input: Felber, Volker, 2012-05-18
Last update: Felber, Volker, 2014-09-23 more...
67 - P1240394
August Oeffner
1442 Schachzeitung , p. 287, 09/1862
P1240394
(13+7) C+
s#5
Weiss soll nur einmal Schach geben
1. Ta6+! Sa5 2. Lc6 cxd6 3. Lb6 d5 4. Ld4 dxc4 5. b4 cxb3ep#
play all play one stop play next play all
more ...
comment
Keywords: Constrained problem, En passant as mating move
Genre: s#
Computer test: A. Baumann: Gustav 4.2a
FEN: 3B4/1Bp5/2RP1P2/1p6/k1P1p3/bnP1p3/1PK1P3/RN1N4
Input: Frank Müller, 2012-06-01
Last update: Dieter Berlin, 2024-02-03 more...
68 - P1241385
Frank Fiedler
3530 Sächsische Zeitung 13/01/2007
Lob
P1241385
(5+8)
#5
1. De4? (Zugzwang) Kc1 2. De1# - aber 1. ... Lc1!
1. Kg1,Kh1? (Zugzwang) Lc1 2. Df1 Kb2 3. Db5# - aber 1. ... Kc1!
1. Kf1? (Zugzwang) Kc1 2. Ke2 Kb1 3. De4 Lc1 4. Dh1 Kb2 5. Db7# - aber 1. ... Lc1!
1. f3? gxf3+ 2. Kxf3 Kc1 3. Df1+ Kd2 4. De2+ Kc1 5. De1# - aber 1. ... Kc1!
1. f4! gxf3ep 2. Kxf3 Kc1 3. Df1+ Kd2 4. De2+ Kc1 5. De1#
1. ... Kc1 2. Kf2 Kb1 3. De4 Lc1 4. Dh1 Kb2 5. Db7#
play all play one stop play next play all
Dieses Problem „Reizt zum Lösen, hübsch. „ (P.Hofmann, Dresden) und ist reichlich mit Verführungen gespickt: 1.De4? (Zugzwang) Kc1 2.De1 matt, aber 1...Lc1!; 1.Kg1,Kh1? (Zugzwang) Lc1 2.Df1 Kb2 3.Db5 matt, aber 1...Kc1!; 1.Kf1? (Zugzwang) Kc1 2.Ke2 Kb1 (2...Tb1? 3.De3 matt) 3.De4 Lc1 (3...Kc1? 4.Dh1 matt) 4.Dh1 Kb2 5.Db7 matt, aber 1...Lc1! und schließlich 1.f3? gf3+ (1...Lc1? 2.Df1 gf3+ (2...Kb2 3.Db5 matt) 3.Kf2,K:f3 Kb2 4.Db5 matt) 2.K:f3 Kc1 (2...Lc1? 3.Df1 Kb2 4.Db5 matt) 3.Df1+ Kd2 4.De2+ Kc1 5.De1 matt, aber 1...Kc1! „Der E.-p.-Schlag geht nur unmittelbar im folgenden Zug. Diese Regel wird hier ausgenutzt.“ (P.Heyl, Eisenach), denn bei 1.f4! gf3 e.p. geht es wie in der letzten Verführung weiter mit 2.K:f3 Kc1 3.Df1+ Kd2 4.De2+ Kc1 5.De1 mit Mustermatt,nach 1...Kc1 ist der Schlag nach f3 jedoch nicht mehr möglich und es kann 2.Kf2 Kb1 (2...Tb1? 3.De3+ Kd1 4.De1 matt) 3.De4 Lc1 (3...Kc1? 4.De1 matt) 4.Dh1 Kb2 5.Db7 ebenfalls mit Mustermatt kommen (4 Punkte). „Galitzkys En-passant-Thema zwecks Feldräumung und Vermeidung schädlicher Linienverstellungen“ (Autor)
SCHRECKE: C+, Gustav 4.2c, Brute Force (2023-06-09)
comment
Keywords: Model mate, En passant
Genre: n#
FEN: 8/8/8/8/6p1/p1pQ2P1/pbp2PKP/rk6
Input: Felber, Volker, 2012-06-12
Last update: Felber, Volker, 2012-06-15 more...
69 - P1242902
Ernst Hasselkus
9400 Deutsches Wochenschach 06/03/1910
P1242902
(10+10)
s#12
1. Dc7+ Kd5 2. Td6+ Ke5 3. f4+ exf3ep 4. Te6+ Kd5 5. e4+ dxe3ep 6. Dd7+ Kc5 7. d4+ cxd3ep 8. Sb7+ Kc4 9. Tc6+ Kb5 10. Tg6+ Kc4 11. Db5+ Kxb5 12. c4+ bxc3ep#
play all play one stop play next play all
Henrik Juel: Popeye 4.61 with 'non 0 1 thr 0' found no flaws (2022-10-14)
comment
Keywords: En passant (4x), Checking key, Batteriematt horizontal, Line opening
Genre: s#
FEN: 3N4/5Qn1/2R4p/4k3/rpppp1Kp/8/2PPPPb1/B1R5
Reprints: 326 Versunkene Schätze , p. 138, 1998
Input: Frank Müller, 2012-06-23
Last update: Dieter Berlin, 2022-10-14 more...
70 - P1243320
Günter Schiller
Dieter Müller

1066 Freie Presse (Chemnitz) 15/05/1970
P1243320
(7+5) C+
#2
1. Txh4? Tf6!

1. g4! droht 2. g5#
1. ... hxg3ep 2. Lg7#
1. ... Sxf4 2. Lxf4#
1. ... Sf6 2. Tg6#
1. ... Sxg4 2. Sf5#
1. ... Tg6 2. Txg6#
play all play one stop play next play all
more ...
comment
Keywords: En passant (s), Pawn mate (Drohung)
Genre: 2#
Computer test: SCHRECKE: popeye 4.89
FEN: 6RK/4N3/r6k/4B2n/5P1p/4n3/6P1/7R
Input: Felber, Volker, 2012-06-28
Last update: Dieter Berlin, 2023-12-22 more...
71 - P1243469
Emil Palkoska
9085 Deutsches Wochenschach 03/10/1909
P1243469
(6+7) C+
s#2
1. Ta6 c5 2. bxc6ep Kxf6#
play all play one stop play next play all
more ...
comment
Keywords: En passant (w)
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: 8/p1p5/4RR1p/KP4kr/5r1p/7P/3B4/8
Input: Frank Müller, 2012-06-30
Last update: Dieter Berlin, 2023-11-27 more...
72 - P1248622
Oleksiy I. Borisenko
1674 Zadachi i etyudy 01-04/2003
2. ehrende Erwähnung
P1248622
(9+3)
s#5
b) -wBg2
a) 1. hxg6ep+ Kh5 2. Dd1+ Kh6 3. Dh5+ Kxh5 4. g4+ Kh6 5. f4 hxg6#
b) 1. Dd1 g4 2. Dh1+ g3 3. f4 g2 4. Dxg2 Kxh5 5. Dg6+ hxg6#
play all play one stop play next play all
Anton Baumann: Retro: Warum soll Dxc1+ g7-g5 illegal sein?
s#5: a) & b) C+ Gustav 4.2a (2024-02-05)
Henrik Juel: You are right, Anton
The keyword 'No legal last move for Black' should be deleted (2024-02-05)
comment
Keywords: En passant as key, No legal last move for Black
Genre: s#, Retro
FEN: 8/7p/4NB1k/4PKpP/4P3/8/5PP1/2Q5
Input: Frank Müller, 2012-09-16
Last update: A.Buchanan, 2017-10-04 more...
73 - P1255845
Bernd Schwarzkopf
13750 Die Schwalbe 231 06/2008
P1255845
(2+3)
#6
Längstzüger
1. cxd6ep! g5 2. d7 Kg7 3. d8=D Kh6 4. Kg4 Kg7 5. Kf5 Kh6 6. Dh8#
play all play one stop play next play all
Anton Baumann: Retro: Unter der Annahme, dass die Längstzügerregel auch für den der Diagrammstellung vorangegangenen Zug gilt, kann der letzte Zug nur d7-d5 gewesen sein! Daher die Lösung:
1.cxd6 e.p.! g5 2.d7 Kg7 3.d8=D Kh6 4.Kg4 Kg7 5.Kf5 Kh6 6.Dh8# (2022-09-14)
comment
Keywords: Maximummer, Kindergarten Problem, Minimal, Miniature, En passant as key
Genre: Fairies
FEN: 7k/6p1/8/2Pp4/8/6K1/8/8
Input: Gerd Wilts, 2012-12-13
Last update: Mario Richter, 2022-09-14 more...
74 - P1257941
Günter Schiller
Dieter Müller

539 Sächsische Zeitung 18/12/1970
P1257941
(7+7) C+
#2
1. e4! droht 2. e5#
1. ... dxe3ep 2. Db2#
1. ... fxe3ep 2. De5#
1. ... fxe4 2. Dxf4#
1. ... Lxe4 2. Tf7#
1. ... Te1 2. Dh4#
play all play one stop play next play all
more ...
comment
Keywords: En passant, Figurenopfer, Line opening, x pieces defend on one square
Genre: 2#
Computer test: SCHRECKE: popeye 4.89
FEN: 3N4/2p4R/5k1K/3b1p1P/3p1p2/5N2/4P2Q/7r
Input: Felber, Volker, 2012-12-30
Last update: Dieter Berlin, 2023-12-22 more...
75 - P1263117
Ralf Krätschmer
Der Tagesspiegel 11/04/1999
P1263117
(9+9)
#5
1. Ta8! Lg6 2. Ta3 Txa3 3. d4 cxd3ep 4. Lf3+ Kf5 5. g4#
2. ... Td3 3. Lf3+ Txf3 4. Txf3 ... 5. Tf4# 2. ... Tg3 3. Tf3 Txg4 4. d3+ cxd3 5. cxd3#
play all play one stop play next play all
Henrik Juel: trial 2... Td3 3.Lf3+,Txd3,cxd3+ (2022-11-09)
comment
Keywords: En passant (s), Rook sacrifice, Pawn mate (zweifach), Bishop sacrifice
Genre: n#
FEN: 7n/3N3b/2p2p1B/1pKP4/2p1k1B1/4r3/R1PP2P1/7n
Input: Felber, Volker, 2013-02-23
Last update: Dieter Berlin, 2022-11-09 more...
76 - P1263142
Ralf Krätschmer
1686 Landeszeitung für die Lüneburger Heide 29/04/2000
P1263142
(11+6) C+
#7
1. c4+? dxc3ep 2. e4 fxe4!

1. Sh5! droht 2. Shf4#
1. ... Ke6 2. Ke8 f4 3. g4 fxg3ep 4. Sg7+ Kd5 5. c4+ dxc3ep 6. e4+ Kd4 7. Sf5#
play all play one stop play next play all
more ...
comment
Keywords: Preplan, En passant (zweifach)
Genre: n#
Computer test: SCHRECKE: Gustav 4.2c
FEN: b2K4/r2p2N1/8/1P1kPp2/3p4/1P1N1P2/2PRP1P1/8
Input: Felber, Volker, 2013-02-24
Last update: Dieter Berlin, 2023-05-20 more...
77 - P1266525
Dirk Boven
21 idee & form , p. 466, 07/1988
Andreas Nievergelt gewidmet
P1266525
(7+8)
#4
1. Tg5? f5 2. Tg7 Lg6+ 3. Kd8 Lf7!
1. a4! droht 2. Tb5 ... 3. Sb8#
1. ... Lc2 2. Tg5 f5 3. Tg7 ... 4. Txa7#
1. ... bxa3ep 2. b4 cxb3ep 3. Txd4 ... 4. Ta4#
play all play one stop play next play all
Henrik Juel: duals like 1.a4 f5 2.Kf8,Kd8 (2023-10-31)
comment
Keywords: En passant (b, doppelt), Line opening
Genre: n#
FEN: 1R2K3/p4p1b/k1NpP3/8/1ppp2R1/8/PP6/8
Input: Felber, Volker, 2013-04-06
Last update: Dieter Berlin, 2023-10-31 more...
78 - P1270606
S. Larsen
Nationaltidende 1901
P1270606
(6+5)
s#3
1. Da3 c4 2. b4 cxb3ep 3. Da5 b2#
1. Da3 c4 2. b4 c3 3. Db2 cxb2#
play all play one stop play next play all
PY??
SCHRECKE: Unlösbar
Die Felder c4+d3 müssen gedeckt werden. Mit einem wSe5 ist die Aufgabe C+! (2023-11-03)
comment
Keywords: En passant
Genre: s#
FEN: 3R4/8/8/2pb4/3k4/6Q1/pP3r2/K3R1B1
Input: Frank Müller, 2013-05-24
Last update: Frank Müller, 2013-05-24 more...
79 - P1272370
Wolfgang Hundsdorfer
Sammler 1906
P1272370
(8+7) C+
s#3
1. f4! gxf3ep 2. Ta5+ Txa5 3. Dd8+ Lxd8#
1. ... Lg5 2. Dh8+ Ld8+ 3. Ka6 Lxb5#
1. ... Lxf6 2. Tf8+ Ld8+ 3. Ka6 Lxb5#
play all play one stop play next play all
more ...
comment
Keywords: En passant
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: k7/3N1R2/1K3Q2/1R1r4/b5pb/1p4p1/1P3PB1/8
Reprints: 3 Die Schwalbe 276 12/2015
Input: Frank Müller, 2013-06-15
Last update: Dieter Berlin, 2024-01-16 more...
80 - P1275091
Karl Flatt
11 Chemnitzer Tageblatt 01/01/1925
P1275091
(9+3)
s#2*
* 1. ... b3 2. cxb3 Kb8,Kc8,Kc7#
1. c4 b3 2. Lxb3 Kb8,Kc8,Kc7#
1. c4 bxc3ep 2. Lc2 Kb8,Kc8,Kc7#
Zwilling siehe Nr. 12
play all play one stop play next play all
SCHRECKE: C+, popeye 4.87 (2023-10-02)
SCHRECKE: Zwilling: P1275092 (2023-11-16)
comment
Keywords: En passant, Mehrvariante
Genre: s#
FEN: b7/1k6/5P1R/1P6/Bp6/3P4/2P4P/6BK
Input: Frank Müller, 2013-07-27
Last update: Frank Müller, 2013-07-27 more...
81 - P1277179
Harald F. Hannemann
21 Skakbladet 22/01/1905
P1277179
(6+3) C+
s#2
1. ... g5 2. g3 hxg3#

1. Ld1! g5 2. g4 hxg3ep#
play all play one stop play next play all
Skakbladet schreibt zum Autor nur: "Hannemann (Ingeniør in Randers)"
SCHRECKE: C+, popeye 4.89 (2023-10-26)
comment
Keywords: En passant in the forward play, Mutate
Genre: s#
FEN: 8/8/6p1/8/6Bp/7P/3P1kPK/7R
Input: Mario Richter, 2013-09-03
Last update: Nightrider, 2023-10-27 more...
82 - P1284487
Alfred Holzerland
69 Volksstimme (Chemnitz) 04/03/1961
P1284487
(8+3)
#2
1. hxg6ep! droht 2. Th4#
1. ... Sxf6 2. Dc1#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2022-09-04)
Henrik Juel: The only possible last move by Black is obviously g7-g5, legitimizing the ep key (2022-09-04)
comment
Keywords: En passant
Genre: Retro
FEN: 5N2/7n/4NP1k/5KpP/R7/8/8/Q2B4
Input: Felber, Volker, 2014-04-11
Last update: Rainer Staudte, 2022-09-04 more...
83 - P1288169
Kjell Widlert
3027 Problemkiste (82) 08/1992
P1288169
(4+9)
h#2
Gitterschach
1. cxb3ep! (Tempo) Txg6 2. Le2 0-0#
2. ... Tf1+? 3. Kf2!
play all play one stop play next play all
Der letzte Zug war b2-b4
En passant als Tempozug. Die Grundidee (Einfachschritt des wB ist im Gitterbrett automatisch ausgeschlossen) kann man schon in Fairy Chess Review finden. Hier ist sie mit Rochade garniert in offener Stellung. die jedoch keinen anderen letzten Zug erlaubt. (Autor).
Ganz toll gemacht! (HB).
Raffinierter Zugzwang (KF).
Das ist schon gemein, was der Autor mit den Lösern vorhat (HM).
Viel Gitterschach (Doppelschritt, Retropatt des Tg7 und Rochade trotz Le2) läßt den bekannten e.p.-Trick in neuem Licht erscheinen (MR).
Henrik Juel: Where is the promotion needed for Valladao? (2024-02-04)
comment
Keywords: Valladao Task, En passant, Castling, Grid Chess
Genre: Fairies, Retro
FEN: 8/4p1R1/4p1p1/8/1Pp4p/2p2k2/2p5/3bK2R
Input: Erich Bartel, 2014-09-16
Last update: Olaf Jenkner, 2015-03-19 more...
84 - P1288722
Arnold Beine
Best Problems 2005
3. Preis
L. Vitale Memorial
P1288722
(3+11)
h#19
Doppellängstzüger
1. a5 d4 2. c5 dxc6ep 3. Db6 cxb7 4. Dh6 bxc8=S 5. Dc1+ Ka2 6. Dh6 Sd6+ 7. Dxd6 Kb1 8. Dh2 Ka1 9. Db8 d5 10. Dh2 d6 11. Da2+ Kxa2 12. 0-0-0 dxe7 13. d5 Kb3 14. Td6 Ka4 15. Th6 Kb5 16. Ta6 Kxa6 17. g5 Kb5 18. Lh6 Kc6 19. Lf8 exf8=D,T (UW-Dual)
play all play one stop play next play all
Anton Baumann: abgesehen vom Umwandlungsdual C+ (Alybadix) (2023-03-28)
more ...
comment
Keywords: Valladao Task, En passant, Castling, Maximummer (Doppel-)
Genre: Fairies
FEN: r1bqkb2/ppppp1p1/8/3P4/8/8/3P4/K7
Reprints: A4387 Phénix (178), p. 7731, 11/2008
Input: Erich Bartel, 2014-09-30
Last update: Alfred Pfeiffer, 2014-09-30 more...
85 - P1292963
Erwin Moritz Herbert Guttmann
1218 Allgemeine Zeitung Chemnitz 31/10/1931
P1292963
(7+4) C+
s#3
1. c4! bxc3ep 2. Da4+ Kxd3 3. Db4 c2#
play all play one stop play next play all
more ...
comment
Keywords: En passant
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: 8/8/8/4p3/1p1kP3/1Q1N1P2/2Pp1P2/3K4
Input: Felber, Volker, 2014-12-24
Last update: Dieter Berlin, 2023-11-05 more...
86 - P1296143
Alexander Henry Robbins
79 Mirror of American Sports 04/10/1884
P1296143
(9+6)
#2
1. c4
play all play one stop play next play all
SCHRECKE: C+, popeye 4.87
1. c4! (Zugzwang)
1. ... bxc3 e.p. 2. Txe3#
1. ... Kxe5,Kxf3 2. Dxd5#
1. ... Kd3 2. Dh7#
1. ... exd2 2. Dxd5#
1. ... Lxe5,L~ 2. Dxd5# (2022-12-14)
comment
Keywords: En passant
Genre: 2#
FEN: 8/1Q6/8/3nP1K1/Rp1bk3/1P2pR2/2PPp3/4B3
Input: Mario Richter, 2015-01-26
Last update: Mario Richter, 2015-01-26 more...
87 - P1298665
Lajos von Szasz
582 L'Echiquier (Brüssel) 1171928
P1298665
(11+12)
#1 vor 20
VRZ, Typ Hoeg
R: 1. Kh5-g4 a4-a3 2. Ta1-b1 a5-a4 3. Tb1-a1 a6-a5 4. Ta1-b1 a7-a6 5. Tb1-a1 b3xBa2 6. Ta1-b1 b4-b3 7. Tb1-a1 b5-b4 8. Ta1-b1 b6-b5 9. Tb1-a1 b7-b6 10. Ta1-b1 c3-c2 11. Tb1-a1 c4-c3 12. Ta1-b1 c5-c4 13. Tb1-a1 c6-c5 14. Ta1-b1 c7-c6 15. Tb1-a1 d4-d3 16. Ta1-b1 d5-d4 17. Tb1-a1 d6-d5 18. Ta1-b1 g3-g2 19. Tb1-a1 g4-g3 20. Ta1-b1, dann 1. fxg6ep#
play all play one stop play next play all
Henrik Juel: White captured all missing black men with cxdxe, exf, and gxf
Black captured all missing white men with bxPa, exfxg, and fxgxh
After the strong key, the plan is very simple: White just waits until last black move must have been g7-g5, permitting the forward mate fxg6ep#
In the given solution, Black is kind enough to retract b3xPa2, ensuring that the white waiting play is unique, with Tb1 going back and forth on a1 and b1
If Black 'retracts' g4xSh3, he will permit a faster forward mate, Sxg5#, and similarly if he 'retracts' f3xSg2 or f4xSg3 (2023-05-10)
comment
Keywords: Defensive Retractor, Type Høeg, En passant, En passant in the forward play
Genre: Retro
FEN: 4Rrbr/5P1k/5P2/4PPp1/6Kp/p2p3p/pPpP2pP/1RB5
Input: Frank Müller, 2015-03-03
Last update: James Malcom, 2023-05-09 more...
88 - P1321497
Pal Benko

P1321497
(5+5) C+
#2
1. axb6ep cxb6+ 2. Sxb6#
1. ... Sxc8,Sxc6 2. b7#
play all play one stop play next play all
In 'My Life' steht als Originalquelle "Games 1996" - welche Publikation damit gemeint ist, ist unklar. In den Index-Files des 'Games and Puzzle Journal' [Jelliss] taucht der Name Benkö nicht auf, laut 'Chess Periodicals' [Felice] gab es zwar einige Magazine, die vom Namen her passen könnten (s. S.90ff, Einträge 1016ff), deren Publikationszeitraum aber jeweils weit vor 1990 endet.

Figurenkranz 3×4 a5c8
Henrik Juel: C+ by Popeye 4.61
Strategems started in 1998, I believe (2016-06-19)
Frank Müller: Die Quelle kann ich auch nicht prüfen. es könnte auch The Games and Puzzles Journal sein. Das gab es zumindest in 1996. (2016-06-19)
Mario Richter: Vielleicht kann jemand mit Zugriff auf alte 'Strategems'-Ausgaben mal schauen, was dort als Originalquelle zu Problem P1000507 angegeben ist - das könnte helfen ... (2016-06-20)
James Malcom: As far as I can see it, it does not appear in the archived issues of The Games and Puzzles Journal: http://www.mayhematics.com/p/p.htm (2021-01-03)
Anton Baumann: vergl. P1402037 (2023-05-15)
comment
Keywords: En passant as key, Symbol problem
Genre: 2#, Retro
Computer test: Popeye 4.61 + analysis
FEN: kbN5/n1p5/B1N5/PpK5/8/8/8/8
Reprints: 284 My life, games and compositions 2003
Input: Mario Richter, 2016-06-19
Last update: A.Buchanan, 2023-05-15 more...
89 - P1326125
Erich Gleisberg
399 Hamburger Problem-Nachrichten (16) 05-06/1949
P1326125
(8+10)
s#10
Längstzüger
1. Ld1 h5 2. gxh6ep g5 3. fxg6ep f5 4. exf6ep e5 5. dxe6ep d5 6. cxd6ep c5 7. bxc6ep b5 8. Lc2 Th7 9. f7 Txf7 10. Kd1 Tf1#
play all play one stop play next play all
Anton Baumann: C+ Alybadix (2023-04-03)
comment
Keywords: En passant (6x), Maximummer
Genre: Fairies
FEN: 8/rppppppp/8/pPPPPPPB/8/4k3/8/2K5
Input: Frank Müller, 2016-10-03
Last update: Frank Müller, 2016-10-03 more...
90 - P1328227
Vasily Mateush
14 Seven Chess Notes (131) 12/2016
P1328227
(3+3) C+
h#3
1. a5 c4 2. Ka6 c5+ 3. b5 cxb6ep#
play all play one stop play next play all
Rolf Wiehagen: Compare to P1401937, from 1938. (2022-11-21)
comment
Keywords: En passant
Genre: h#
Computer test: Popeye Windows-64Bit v4.61 (4952 MB)
FEN: 8/kpK5/p7/8/8/8/2P5/5B2
Input: Frank Müller, 2016-12-03
Last update: Frank Müller, 2016-12-03 more...
91 - P1343579
Kjell Widlert
9771 FEENSCHACH 817-820 07-09/1970
P1343579
(6+9) C+
h#2
Circe
1. ... gxh6ep[+sBh7]! 2. Dxg4[+wBg2] Sxg4[+sDd8]#
1. Sf3? gxh5[+sBh7] 2. Dg4 Sxg4[+sDd8]#
R: 1. h7-h5 2. Sf3xBh2[+sBh7]
play all play one stop play next play all
Five retro tries h#2 but not distinct:
1.Sh4-f3 g4*h5[+bPh7] 2.Qh3-g4 Sh2*g4[+bQd8] #
1.Sh4*g6[+wPg2] g2*h3[+bQd8] 2.h5*g4[+wPg2] Sh2*g4[+bPg7] #
1.Sh4*g6[+wPg2] g4*h5[+bPh7] 2.Qh3-g4 Sh2*g4[+bQd8] #
1.h5*g4[+wPg2] g2*h3[+bQd8] 2.Sh4-f3 Sh2*g4[+bPg7] #
1.h5*g4[+wPg2] g2*h3[+bQd8] 2.Sh4*g6[+wPg2] Sh2*g4[+bPg7] #
Klären ob Originalforderung h#2
Alfred Pfeiffer: Originalforderung war h#2. In der Lösungsbesprechung (fs-1, 01/1971, S.17) steht: "Korrekterweise sollte bei Aufgaben dieser Art ein Hinweis gegeben werden, daß sie Retroanalyse erfordern!".
Bei der Scheinlösung hat weiß keinen letzten Zug. (2017-11-23)
Henrik Juel: Giving a hint about retro analysis would spoil the fun (2017-11-23)
A.Buchanan: Quite right Henrik. Solvers should always be on their toes (2023-12-07)
comment
Keywords: Circe, En passant as key, No legal last move for White
Genre: Fairies, Retro, h#
Computer test: laut WinChloe
FEN: 8/8/6P1/6Pp/6Pn/4P1pq/3prk1N/4bb1K
Input: HBae, 2017-11-23
Last update: A.Buchanan, 2023-12-07 more...
92 - P1384676
Christian Poisson
Messigny 2001
3. Platz
P1384676
(16+15) C+
BP in 8.0
1. g4 c6 2. Lh3 Da5 3. Kf1 Kd8 4. Kg2 Kc7 5. Kf3 Kd6 6. Ke4 Ke6 7. g5+ f5+ 8. gxf6ep+ Df5+
play all play one stop play next play all
A.Buchanan: It's still sound if 9. Lxf5+ is added for the 5th check (2023-04-08)
more ...
comment
Keywords: Unique Proof Game, En passant, Consecutive checks (4)
Genre: Retro
Computer test: Popeye v4.85
FEN: rnb2bnr/pp1pp1pp/2p1kP2/5q2/4K3/7B/PPPPPP1P/RNBQ2NR
Input: fs/hg, 2020-12-30
Last update: James Malcom, 2021-01-24 more...
93 - P1398780
Andrew Buchanan
AA007 The Hopper Magazine I01 24/12/2021
P1398780
(16+15)
Drawn game. PG in 9.0
Moldenhauer: Computerprüfung: C- oder Cooked Stelvio 1.4 in 1 Sekunde.
Die Diagrammstellung ist verschieden erreichbar.
Hier 2 Möglickeiten:
1.Sa3 d5 2.Sb1 Kd7 3.f3 De8 4.Kf2 e5 5.Kg3 De6 6.Kh4 Dg6
7.Kh3 e4 8.fxe4 f6 9.e5 Ke8+
1.Sa3 d5 2.Sb1 Dd6 3.f3 Da6 4.Kf2 Sd7 5.Kg3 Dg6+ 6.Kh4 e5
7.Kh3 e4 8.fxe4 f6 9.e5 Sb8+ (2023-07-29)
A.Buchanan: Hi Moldenhauer this problem is sound. You are forgetting the constraint: "Drawn game". (2023-07-29)
Moldenhauer: Hi Andrew, ich habe deshalb nur die Diagrammstellung angegeben.
Ich hoffe Andrew ist erlaubt! Mein Vorname ist Klaus. (2023-07-29)
A.Buchanan: Hi Klaus nice to meet you, thanks for all your work. The point of HC+ is that it combines human & computer logic intelligently. It makes zero sense to solve robotically for 9.0. It is definitely valuable to solve this kind of stipulation (1) as PG in 5.0, and then (2) as PG A-B for 2.0. Apparent duals can then be resolved through reasoning about castling, e.p. and premature draw. (2023-07-29)
comment
Keywords: Draw by repetition, Unique Proof Game, Constrained problem, Castling, En passant (not!)
Genre: Retro
FEN: rnb1kbnr/ppp3pp/5pq1/3pP3/8/7K/PPPPP1PP/RNBQ1BNR
Input: A.Buchanan, 2022-01-31
Last update: Miguel Ambrona, 2023-07-26 more...
94 - P1401495
Igor Vereshchagin
Odessa 1997
Special commendation
P1401495
(10+14) C+
h#2 (AP)
1. a4xb3ep+ Sxa5+ 2. Kd5 0-0-0# (by AP not Td1#?)
R: 1. b2-b4 Kb4-c4+ 2. Sd6-b7,Sd6xLc7
play all play one stop play next play all
With the typo wPd5 corrected to e5, the two forward candidate solutions are correct. How about the retro? Assume that White castling rights remain. bBg5 is promoted, and did so on c1 or g1. In either case, there were 6 pawn caps by Black, but in the former case, the blockaded wRh was not consumable. So the promotion must have been on g8, and White can't retract h2-h3. The missing White unit is light B, so was not just captured on e5 or b4. wRf6 is promoted, say wPd, which would have involved no captures.

This leaves b2-b4, preceded by Kb4-c4+ and before that Sd6-b7. Prior to b2-b4, why couldn't bQ have just played e.g. Qa8-a5+ instead? Because there would still be no prior move: wSb7 can't have just come from h5 or e6. Similarly Rc3-a3 has no precedent.

We don't know exactly what happened to sLc, but that doesn’t affect the soundness. It might have enabled wPc or wPd to capture. wPd did promote, but maybe it was wPc that after capturing promoted to T. Alternatively, Sd6xLc7 was possible.
Henrik Juel: Popeye 4.61 with 'opt enp b3' found no solution (2022-05-27)
Gerald Ettl: Schaut so aus, als ob die sDa5 nach e5 muss. 1.axb3 ep Sa5+ 2.Kxd5 0-0-0# (2022-05-27)
Gerald Ettl: aber auch 2.-Td1# ? (2022-05-27)
Henrik Juel: Andrew, can you throw any light on this problem? (2022-05-28)
Henrik Juel: Gerald, in AP problems like this one White must castle to legitimize the ep capture key (2022-05-28)
A.Buchanan: Hi Henrik, Gerald. I found this one in WinChloe with the current diagram. It gave the "solution" 1. axb3ep+ Sxa5+ 2. Kd5?? 0-0-0#. However when I tried running the WinChloe solver just now, it said there's no solution. Quite right: Rf5 controls d5. I don't think we can shift Qa5 to e5 though.
My first thought is that wPd5 should be on e5. Check my suggested solution in the solution text. However, as you will see, I think we need a second thought as well! Hope the finest retro minds can figure this out. Failing that, we could ask Igor. (2022-05-28)
Mario Richter: The diagram in the reprint in 'Uralsky Problemist' is exactly as given here. The solution given there without further explanation is: 1. ab+ (e.p.) Sxa5+ 2. Kd5 0-0-0#!
Notice that the second black move doesn't contain a capture sign!

Some typos in Andrew's analysis:
The black potential promotion squares should be c1 and g1.
White's last move couldn't have been b3-b4?? simply because that would give an illegal check. (2022-05-28)
A.Buchanan: Thanks Mario for the careful reading. I’ve fixed the errors. Pd5 may be a typo in the reprint then. It also creates a bogus retraction d4-d5, so I don’t think it can be right. Now for Igor. (2022-05-29)
A.Buchanan: Joaquim Crusats spotted R: 1. b2-b4 Kb4-c4+ 2. Sd6-b7, which I'm sure is the intended retraction. So we diagnose a single typo that occurred in the Uralsky reprint diagram: wPe5 appeared on d5. I suggest correcting it here. (2022-05-30)
A.Buchanan: Author confirmed this was a typo (2022-11-23)
more ...
comment
Keywords: a posteriori (AP) (Type Petrovic), En passant as key, Castling (wg), Promotion (Tl), Valladao Task
Genre: h#, Retro
Computer test: Once the diagram typo was fixed, C+ Popeye v4.87 & basic but tricky retro logic
FEN: 3n4/1Np1p1p1/4pn2/q1p1PRb1/pPk1pr2/r6P/P4PP1/R3K3
Reprints: 18 The Ural's Problemist 13, p. 5, 02/1998
Input: A.Buchanan, 2022-05-27
Last update: A.Buchanan, 2022-05-30 more...
95 - P1403722
Klaus Wenda
Schweizerische Schachzeitung 1970
3. Preis
Informalturnier
P1403722
(9+9) C+
#5
1. d4? h1=D! 1. e4? Sxe4 2. d4 Sc3!

1. a4! bxa4 2. c4 bxc3ep 3. e4 Sxe4 4. d4 Sxd6 5. Sd8#
play all play one stop play next play all
more ...
comment
Keywords: Staggered preplans, En passant (zweifach), Knight sacrifice, Model mate, Logical Problem
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 6B1/1N1p2p1/1PkN1p2/Kp6/1p6/P7/1pPPPn1p/8
Reprints: 288 Problem-Palette , p. 99, 1970
Input: Dieter Berlin, 2022-08-18
Last update: Dieter Berlin, 2022-08-18 more...
96 - P1404088
Emil Mächler
? 1984
2. ehrende Erwähnung
Geburtstagsturnier A. Piatesi
P1404088
(12+9) C+
#2
1. b4? droht 2. Sef4# 1. ... axb3ep 2. Ta5# 1. ... cxb3ep 2. c4# 1. ... Dxd2!
1. d4? droht 2. Se7# 1. ... cxd3ep 2. c4# 1. ... exd3ep 2. Lg2# 1. ... Dg5!

1. f4! droht 2. Se7#
1. ... exf3ep 2. Df5# 1. ... gxf3ep 2. Tg5#
play all play one stop play next play all
more ...
comment
Keywords: En passant (Häufung), Pawn mate (zweifach-Verf.)
Genre: 2#
Computer test: SCHRECKE: popeye 4.87
FEN: 1b6/3K4/2PpN1N1/3k4/p1p1p1p1/2P4B/1PQP1P2/R1q2nR1
Reprints: 73 Schweizer Schachkompositionen 1976-1986 , p. 31, 1989
Input: Dieter Berlin, 2022-09-06
Last update: Dieter Berlin, 2022-09-06 more...
97 - P1404274
Gyula Breyer
Magyar Sakkvilag 31/05/1919
P1404274
(14+15)
Weiß zieht und setzt nicht matt
1. bxc6ep!

Auflösung Dr. Jenö Bán:
R: 1. ... c7-c5 2. Kd7-e6 Df7-e8 3. Kc6-d7 Ke5-e4 4. Sd2-f1 Lg7-f8 5. Sf2-h1 Da2-f7 6. Tf8-f3 Sa4-c3 7. f7-f8=T Ke6-e5 8. f6-f7 Kf7-e6 9. f5-f6 Db1-a2 10. f4-f5 Lf5-d3 11. Kd5-c6 Tg8-b8 12. Kc4-d5 Tb8-b7 13. La8-g2 Lh6-g7 14. Df1-h3 Lg7-h6 15. Tg1-g3 Lh6-g7 16. Th1-g1 Dd1-b1 17. Sh3-f2 Ke8-f7 18. Sg1-h3 Sc5-a4 19. a7-a8=L Lc8-f5 20. a6-a7 Sf7-h8 21. a5-a6 Th8-g8 22. a4-a5 Ta8-b8 23. a2-a4 Sa6-c5 24. Kc3-c4 a5xTb4 25. Tb1-b4 Lf8-h6 26. Ta1-b1 f5xLg4 27. Sb1-d2 d2-d1=D 28. Dd1-f1 d3-d2 29. Le1-h4 Sh6-f7 30. Ld2-e1 f7-f5 31. Lc1-d2 Sg8-h6 32. Kd2-c3 g7-g6 33. Ke1-d2 Sb8-a6 34. b4-b5 a7-a5 35. b2-b4 b7-b6 36. d2xDe3 Dd4-e3 37. f2-f4 Dd8-d4 38. Lh3-g4 d4-d3 39. Lf1-h3 d5-d4 40. g4-g5 d7-d5 41. g2-g4
play all play one stop play next play all
Schwarz schlug axb und fxg, der weiße Doppelbauer e2e3 erfodert eine weißen Schlag, damit sind alle fehlenden Steine erklärt. Der fehlende sBd7 mußte schlaglos auf d1 umwandeln, bevor er geschlagen werden konnte, also stammt wBe3 von d2, und die wBBa2 und f2 haben auf a8 bzw. f8 umgewandelt, bevor sie geschlagen wurden. Nur zuletzt R: 1. ... c7-c5 verhindert das weiße Retropatt, also ist der ep_Schlüssel legal.
Henrik Juel: 1.bxc6ep
R: 1... c7-c5 2.Kd7-e6 Df7-d8+ 3.Ke6-d7 Dg7-f7+ 4.Kd7-e6 Ke5-e4 etc. (2022-09-11)
comment
Keywords: En passant as key
Genre: Retro
FEN: 1r2qb1n/1r2p2p/1p2K1p1/1Pp3P1/1p2k1pB/2nbPRRQ/2P1P1BP/5N1N
Reprints: Gyuala Breyer - The Chess Revolutionary [ed. Jimmy Adams] , p. 807, 2017
Input: Mario Richter, 2022-09-11
Last update: Mario Richter, 2022-09-11 more...
98 - P1404500
Hans Johner
Schweizerische Schachzeitung 1967
G. Baumgartner gewidmet
P1404500
(12+10)
#4
1. Sxb3! droht 2. e4+ fxe3ep 3. Df1+ Sf4 4. Dxf4#
1. ... Lf2 2. Dh1 Tf3,Tg3 3. e4+ fxe3ep Sd4#
1. ... Th3 2. e4+ fxe3ep 3. Df1+ Tf3 4. Dd3#

1. ... Te3 2. Tef6+ Ke4 3. c7+
1. ... Le3 2. Dh1 Ld2 3. e4+
1. ... Lg1 2. Dxg1 Txb3+ 3. cxb3
play all play one stop play next play all
Henrik Juel: several duals, e.g., 1... Tc4 2.Dd1,Dh1 (2022-09-20)
comment
Keywords: Intersection Theme, Capture key, selfpinning (wS), En passant (schwarz), Line closing (zweifach)
Genre: n#
FEN: B7/n6r/1bPBR1R1/1p3k1p/1N3p2/Kpr5/1PP1P1n1/Q1N5
Reprints: 161 Kunstschach in der Schweiz , p. 91, 1980
Input: Dieter Berlin, 2022-09-20
Last update: Dieter Berlin, 2022-09-20 more...
99 - P1404659
Hans Rosset
Schweizerische Schachzeitung 1976
P1404659
(9+10)
#5
1. Sf6? Tfxf6 2. Dxb7# 1. ... Thxf6! 1. Db6? Te6!

1. De3! droht 2. Dxe4#
1. ... Th4 2. f4 Thxf4 3. Db6 T4f6 4. Sxf6+ Txf6 5. Dxb7#
2. ... exf3ep 3. Sc7+ Txc7 4. Dxf3+ e4 5. Df5#
play all play one stop play next play all
Henrik Juel: dual 1.De3 Th4 2.f4 Thxf4 3.Lb3 4.Dxd6+,cxb3 (2022-09-25)
comment
Keywords: Perilenkung (sT), En passant (s), Knight sacrifice (zweifach)
Genre: n#
FEN: 1K2N3/Qp3r2/3p3r/1P1kp1N1/1Pb1p3/2Pp2p1/2P2P2/8
Reprints: 209 Kunstschach in der Schweiz , p. 115, 1980
Input: Dieter Berlin, 2022-09-25
Last update: Dieter Berlin, 2022-09-25 more...
100 - P1404675
Hans Johner
Schweizerische Schachzeitung 1973
Lösungsturnier Weggis
P1404675
(7+8) C+
#5
1. e4! droht 2. Tfg3#
1. ... dxe3ep 2. Sd4 cxd4 3. Se5+ dxe5+ 4. Ke4 ... 5. Tfg3#
play all play one stop play next play all
more ...
comment
Keywords: En passant (s), Knight sacrifice (doppelt)
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 8/3r4/3p2N1/1NpK2p1/1b1p2k1/5R1R/2r1PP2/8
Reprints: 206 Kunstschach in der Schweiz , p. 113, 1980
Input: Dieter Berlin, 2022-09-26
Last update: Dieter Berlin, 2022-09-26 more...
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