Die Schwalbe

9 problem(s) found in 6953 milliseconds (displaying 9 problem(s)). [COMMENTDATE>=20220810 AND NOT S='Problem-Palette' AND A='Keym, Werner'] [download as LaTeX]

1 - P1080382
Werner Keym
13879 Die Schwalbe 233 10/2008
1. Preis
P1080382
(13+12)
#3
Henrik Juel: 1.0-0 thr. 2.Dxc6+,Td1 (2023-07-18)
A.Buchanan: I don't think it's as straightforward as this. Under PRA, there are 2 parts: a) wK & sD rights ok b) wD & sK ok. We tackle each separately. a) 1. 0-0? 0-0-0! 1. Td1! b) 1. 0-0-0? 0-0! 1. Tf1! The forward play is messy, and there are three promoted units, but the amazing paradox is that White wins by not castling. This is not a case of mutual exclusion. This is why it got first prize, I think. (2023-07-18)
Mu-Tsun Tsai: Yeah, on second thought I indeed got it the wrong way; it is in fact possible that Kq castling are both valid (I have the proof game in fact), and I take your word that the other side is also true. (2023-07-19)
A.Buchanan: For complete retro proof, need both retro logic & non-unique proof games. For the latter, maybe can show the legality of rn2k1nr/ppp1p1pp/4P2B/4p3/2P1Q3/2P5/PP2P1PP/R1b1KB1R. From here, can branch to the two ways of getting the two rook promotions: (a1+h8 vs h1+h8) (2023-07-19)
Henrik Juel: If Andrew's analysis holds, the keys are correct by Popeye 4.61
But there are duals in each part (2023-07-20)
more ...
comment
Keywords: Partial Retro Analysis (PRA), Castling
Genre: Retro, 3#
FEN: r3k2r/bRp1p1p1/1pn1P2B/rB2p3/n1P1Q3/2P1P3/1P4P1/R3K2R
Reprints: 172 Eigenartige Schachprobleme 2010
(8) Die Schwalbe 241 02/2010
A Die Schwalbe 283, p. 9, 02/2017
Input: Gerd Wilts, 2009-01-03
Last update: Mu-Tsun Tsai, 2023-07-19 more...
2 - P1085411
Werner Keym
13393 Die Schwalbe 225 06/2007
P1085411
(8+9)
Letzter Zug?
Duplex
s) R: 1. b3xBa2 f6xBg7
w) R: 1. ... f6xBg7 2. b3xBa2
play all play one stop play next play all
All captures are accounted for by hungry pawns, wBf1 died at home, & bPh waylaid. wPa & bPg can only have been captured on their home squares. bPc6 & bPd6 can't have just moved as they would close off bB homes. Most interestingly, wPd4 must have captured light-squared bB, but did not do so recently, as wPf3 would lock the south-east cage. Need Ng1 to shield wKh1, allowing bKg3. So the two last single moves are clear, and may have occurred in either order.
Henrik Juel: Good analysis, Andrew (2024-02-19)
comment
Keywords: Last Move? (BxB,BxB), Type D (DD), Economy record (Last Move? Type DD), Volet Pawn (2), waylaid (sBh)
Genre: Retro
FEN: 8/ppp3P1/2pp4/8/4P3/7P/p1PPPkPK/4bq2
Input: Gerd Wilts, 2009-06-08
Last update: A.Buchanan, 2024-02-19 more...
3 - P1108458
Werner Keym
Main-Post 1968
P1108458
(14+0)
Ergänze den sK, dann #1
a) +sKd3 1. 0-0-0? Castling rights lost
b) +sKf7 1. g8=D#
play all play one stop play next play all
+sKd3? und 1.0-0-0# macht nicht, veil die Stellung ist illegal (saB & sbB).
Das Brett wird um 180° gedreht, dann +sKf7 und 1. g7-g8=D#
Henrik Juel: I believe that the try is
add sK on d3 and 1.0-0-0#
This addition is illegal, however:
the white h-pawns captured all 15 missing black men, but [Pa7,b7] need three captures to promote, and only two white men are missing (2023-04-13)
comment
Keywords: Joke, Board Rotation (180), Add pieces (sK), Cant Castler
Genre: Retro
FEN: 6B1/4R2P/P6P/B6P/7P/7P/1P5P/R3K1N1
Input: Gerd Wilts, 2010-06-23
Last update: A.Buchanan, 2023-04-15 more...
4 - P1146359
Werner Keym
Allgemeine Zeitung Mainz 17/07/1971
P1146359
(3+1)
#3
1. Tc3! Kg1 2. Tc2 Kh1 3. 0-0-0#
1. ... Kh2 2. Kf1 Kh1 3. Th3#
play all play one stop play next play all
E2-c1
SCHRECKE: C+, popeye 4.87 (2022-08-11)
comment
Keywords: Miniature Collection (0051727), Castling as mating move, Aristocrat, Rex solus (s), Castling (wg)
Genre: 3#
FEN: 8/8/8/8/8/8/6k1/R1R1K3
Reprints: 20 Der Schachzug (FV Schach Berlin) 20 08/1977
Input: Felber, Volker, 2010-09-11
Last update: Mario Richter, 2022-08-11 more...
5 - P1147006
Werner Keym
XIII Die Schwalbe 17-18, p. 287, 05/1969
P1147006
(3+4) C+
#3
1. Td1? 0-0!

1. 0-0-0 0-0 2. Tg1+ Kh8 3. Dg7#
play all play one stop play next play all
E2-d3 E2-b3
vf: sBBa5/e5, Boris Pustowoi, 06.05.1972, Omskaja prawda
more ...
comment
Keywords: Miniature Collection (0292335), Miniature, Castling key (0-0-0), Castling (b, 0-0)
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 4k2r/2Q4p/p7/8/8/8/8/R3K3
Reprints: C Die Schwalbe 18, p. 431, 12/1972
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-10-01 more...
6 - P1184196
Werner Keym
feenschach 183 2010
Hans Gruber zum 50. Geburtstag gewidmet
P1184196
(12+15)
#2
Die letzten Züge waren g7-g5 g6xLh7. Daher 1.h5xg6 e.p.! 0-0-0 2.a8D#.
play all play one stop play next play all
Das ist der erste (korrekte) Zweizüger mit den konsekutiven Spezialzügen En passant-Schlag, Rochade und Umwandlung (Valladao). (vgl. P1080516 (inkorrekt) und P1184197)
Henrik Juel: C+ Popeye 4.61 and analysis (2022-09-11)
comment
Keywords: Valladao Task
Genre: Retro
FEN: r3k3/P2p3P/pp1P1p1p/3p2pP/6nq/4bPrR/1P2PpRB/5BnK
Input: Gerd Wilts, 2011-01-06
Last update: Rainer Staudte, 2022-09-11 more...
7 - P1406456
Werner Keym
OP016 The Hopper Magazine I02 25/06/2022
corrects Keym Schach-Echo 1967 / Die Schwalbe 2007
P1406456
(15+5)
#1 AP
b) - Lh8
a) 1. ... bxa3ep 2. Dc3#!
(2. 0-0#?)
1. 0-0#? (rights lost)

b) 1. ... bxa3ep 2. 0-0#!
(2. Dc3#?)
1. 0-0#? (Black to move if rights remain)
play all play one stop play next play all
a) White & Black have made 11+1 pawn captures, accounting for all missing material. bPa captured to b file (must be bPb2 now, to get behind wPb) so bPh promoted on h1, to supply balance. Therefore White cannot castle. Black has no last move, so by Article 15 we can conclude that Black has the move. The only way to give Black a move is R: 1. a2-a4 a3xNb2. Therefore ep is legal, and indeed that is Black's only move. After 0... bxa3ep, White mates with 1.Dc3#! not 1.0-0#? since castling is illegal. AP is not used in this twin, but is available as a condition in order to make twins as similar as possible, and show that the difference in behaviour comes just from wBh8, not from conditions.
b) Now there is a second white unit missing, which gives more retro possibilities. One case is that bPh might have captured to g-file, to promote (or to be captured if original bPg promoted), so White may retain castling rights, but in this case it must be Black to move. So 1.0-0#? doesn't work as a solution. Alternatively, if White has lost castling rights, Black might have just played c2xNb1=R, or c3xNb2 or a/c5xb4. So in this scenario we cannot prove unconditionally that it's really Black to play.
However, under adversarial AP, White makes a double claim: firstly that it is Black to move (AP Type Keym), and secondly that ep is legal (AP Type Petrovic). If White retains castling rights, then both of these items are correct, and the ep must be bxa3 not bxc3. So White mates with 1.0-0#! for AP justification, not 1.Dc3#?.
corrects P1108454
Henrik Juel: here is my guess
a) 0... bxa3ep 1.Dc3#
b) 1.0-0# (2022-12-05)
A.Buchanan: Comments on the proposed solution welcome (2023-08-21)
more ...
comment
Keywords: a posteriori (AP) (Type Keym), a posteriori (AP) (type Petrovic), No legal last move for Black, En passant as key, Castling, Cant Castler (wk)
Genre: Retro
FEN: 7B/2P5/3P4/1P2Q3/PpP1N3/1P1P4/1p1RBP2/brk1K2R
Input: A.Buchanan, 2022-12-05
Last update: A.Buchanan, 2023-08-22 more...
8 - P1409983
Andrey Frolkin
Werner Keym

1.67 Eigenartige Schachprobleme , p. 196, 2010
P1409983
(10+2)
Letzter Zug?
R: 1. g3xBh4 h5-h4 and e.g. 2. Kf4-g5 Kh4-h3
play all play one stop play next play all
Compare P0000999 with more non-standard material
more ...
comment
Keywords: Economy record (Last Move? Type A), Last Move? (BxB), Non-standard material (L), Type A, Type B (a fortiori), Economy record (Last Move? Type B), Minimal
Genre: Retro
FEN: 8/1p5P/6PP/5BK1/6PP/5B1k/6NP/8
Input: A.Buchanan, 2023-05-28
Last update: A.Buchanan, 2023-05-31 more...
9 - P1411211
Werner Keym
OP035 The Hopper Magazine I04 13/07/2023
P1411211
(3+11)
Last move?
R: 1. Ke8xDf7#
play all play one stop play next play all
Version of Die Schwalbe 1990, see P0000180
SCHRECKE: vergleiche: P0000180 (2023-07-25)
more ...
comment
Keywords: Last Move? (KxD), Type C, Type M
Genre: Retro
FEN: nBk2Rn1/pp1ppKp1/1p3p1p/8/8/8/8/8
Input: Miguel Ambrona, 2023-07-25
Last update: A.Buchanan, 2023-07-27 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (4)
Felber, Volker (2)
A.Buchanan (2)
Miguel Ambrona (1)