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11 problem(s) found in 8325 milliseconds (displaying 11 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT A='Kohtz, Johannes' AND A='Elkies, Noam D.'] [download as LaTeX]

1 - P0007036
Noam D. Elkies
3370 U.S. Problem Bulletin 102/103 07-10/1995
Lob
P0007036
(15+13) C+
BP in 17.5
1. a4 b6 2. a5 Lb7 3. a6 Dc8 4. axb7 Sa6 5. b8=L Db7 6. f3 Dc6 7. f4 Dc3 8. dxc3 Kd8 9. Le3 Kc8 10. Lc5 Kb7 11. Lb4 Kc6 12. La5 bxa5 13. e3 Kb6 14. Lb5 Kb7 15. Se2 Kc8 16. Tf1 Kd8 17. Tf3 Ke8 18. Dxd7#
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D. Meinking: Comm., USPB 1995-1997 (2002-07-06)
Moldenhauer: Computerprüfung: C+ Natch 3.3 in 45 Std. 46 Min.
Bei 16.5, 17.0 keine Lösung. BP 18.0 64 Lösungen.
C+ Euclide 1.11 in 44 Std. 07 Min. (2023-01-10)
A.Buchanan: This is a cool problem with tempo loss for both players (bK9 & wPf2). Noam likes to end proof games with checkmate, and in this case I guess it serves to eliminate shorter solutions which would otherwise save half a move. Checking 16.5 is sufficient for soundness. Thanks for taking the time to test. (2023-01-11)
A.Buchanan: Bit baffled how there can be 64 solutions in 18.0 moves since White just moved. 18.5 maybe? (2023-01-11)
ras@bsiag.com: Quickly checked because 45h seemed a lot for only 17.5 moves and only a few captures: Stelvio 0.98 is done in 210 seconds. (2023-01-11)
ras@bsiag.com: Well, Stelvio treats shorter solutions of same parity as cooks, so any shorter solution in 16.5, 15.5 etc would have been found by checking for 17.5. But anyhow, quickly checking 16.5 is done in a few seconds, finding no solution (of course). (2023-01-12)
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comment
Keywords: Unique Proof Game, Promenade (K), Tempo Loss (sK9 wBf2), Prenix (L), Obvious promotion (L)
Genre: Retro
Computer test: Computerprüfung: C+ Natch 3.3 in 45 Std. 46 Min. Bei 16.5, keine Lösung.
FEN: rB2kbnr/p1pQpppp/n7/pB6/5P2/2P1PR2/1PP1N1PP/RN2K3
Input: Gerd Wilts, 1996-08-12
Last update: A.Buchanan, 2023-01-11 more...
2 - P0007041
Noam D. Elkies
3408 U.S. Problem Bulletin 102/103 07-10/1995
P0007041
(16+16) C+
BP in 16,0
1. c3 g5 2. Da4 g4 3. Df4 d5 4. h3 d4 5. Dh2 g3 6. Kd1 Lg4 7. Kc2 e6 8. Kd3 Lb4 9. Ke4 c5 10. Ke5 Sc6+ 11. Kf4 Df6+ 12. Ke4 Sge7 13. Kd3 0-0 14. Kc2 Kh8 15. Kd1 Tg8 16. Ke1 Taf8
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Moldenhauer: Ergänzung: Stelvio 1.2. Keine Lösung BP 15.0, BP 15.5. (2023-05-20)
comment
Keywords: Unique Proof Game, Castling, Tempo Loss (K11), Capture-free
Genre: Retro
Computer test: Stelvio 1.2, 27sec
FEN: 5rrk/pp2np1p/2n1pq2/2p5/1b1p2b1/2P3pP/PP1PPPPQ/RNB1KBNR
Input: Gerd Wilts, 1996-08-12
Last update: Reto, 2023-05-14 more...
3 - P0008788
Noam D. Elkies
FIDE Kongress 39 Tel Aviv 1996
1. Preis
P0008788
(12+16) cooked
BP in 23,0
1. c3 c6 2. Db3 Db6 3. Kd1 Dxf2 4. Db6 axb6 5. h4 Ta3 6. Th3 Tb3 7. a4 Ta3 8. Tg3 Ta2 9. Tg6 hxg6 10. Sh3 Th5 11. Sf4 Tb5 12. h5 Tb3 13. h6 Tba3 14. b3 Tb2 15. h7 Taa2 16. Sa3 Tb1 17. h8=T Tab2 18. Ta2 Ta1 19. Th3 Tbb1 20. Tc2 Tb2 21. Sb1 Tba2 22. La3 Tb2 23. Tg3 Dxf1#
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Cook: 1. a4 Sa6 2. Ta3 Sb8 3. Tg3 c6 4. Tg6 hxg6 5. Sh3 Th4 6. Sf4 Tg4 7. h4 Tg3 8. Th3 Ta3 9. h5 Ta1 10. Ta3 Da5 11. c3 Db4 12. Db3 Dc5 13. Db6 axb6 14. Kd1 Ta5 15. Ta2 Tb5 16. h6 Tb3 17. h7 Ta3 18. b3 Dxf2 19. Tc2 T3a2 20. h8=T Tb2 21. Th3 ...
Michel Caillaud: cooked by Stelvio 0.93 :
1.a4 Sa6 2.Ta3 Sb8 3.Tg3 c6 4.Tg6 hxg6 5.Sh3 Th4 6.Sf4 Tg4 7.h4 Tg3 8.Th3 Ta3 9.h5 Ta1 10.Ta3 Da5 11.c3 Db4 12.Db3 Dc5 13.Db6 axb6 14.Kd1 Ta5 15.Ta2 Tb5 16.h6 Tb3 17.h7 Ta3 18.b3 Dxf2 19.Tc2 T3a2 20.h8=T Tb2 21.Th3… (2022-12-19)
comment
Keywords: Unique Proof Game
Genre: Retro
FEN: 1nb1kbn1/1p1pppp1/1pp3p1/8/P4N2/BPP3R1/1rRPP1P1/rN1K1q2
Input: Gerd Wilts, 1997-06-21
Last update: Silvio Baier, 2023-03-02 more...
4 - P1004002
Noam D. Elkies
R0094 StrateGems 17 01-03/2002
Richard Stanley gewidmet
P1004002
(14+15) C+
BP in 23.5
1. Sc3 d5 2. Sxd5 h6 3. Se3 Dd3 4. Tb1 Dh7 5. Sf5 a5 6. e3 a4 7. Dh5 a3 8. Ke2 axb2 9. a4 Ta6 10. a5 Tg6 11. a6 c5 12. a7 c4 13. a8=T c3 14. Ta6 cxd2 15. Tb6 d1=T 16. Ld2 Sf6 17. La5 Td8 18. c3 Sbd7 19. Kd3 Dg8 20. Kd4 Th7 21. Lb5 Dh8 22. La4 Sg8 23. Kd5 f6 24. Ke6= patt
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James Malcom: Is this the record for the longest PG ending in stalemate? (2020-11-13)
A.Buchanan: There are no shorter ones in PDB without a promotion ("=" can mean promotion or draw). Coming at 41.5 by Guus Rol there is P1011937, ending in draw by 3Rep. (2020-11-13)
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comment
Keywords: Unique Proof Game, Non-standard material (Tt)
Genre: Retro
Computer test: Natch 3.1 (15 min.)
FEN: 2brkbnq/1p1np1pr/1R2Kprp/B4N1Q/B7/2P1P3/1p3PPP/1R4NR
Input: Gerd Wilts, 2002-04-05
Last update: James Malcom, 2021-11-09 more...
5 - P1181666
Noam D. Elkies
Tim Krabbé's Website (267) 16/11/2004
P1181666
(13+13)
#10
1. Ddxe5+ Ddxe5+ 2. Dcxe5+ Dcxe5+ 3. Dbxe5+ Dbxe5+ 4. Daxe5+ Dfxe5+ 5. Dfxe5+ Dgxe5+ 6. Dgxe5+ Dhxe5+ 7. Dhxe5+ Tcxe5+ 8. Txe5+ Txe5+ 9. Txe5+ Dxe5+ 10. Dxe5#
mit Zugumstellungen
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https://timkr.home.xs4all.nl/chess2/diary_14.htm


Automatische Zugfolge (No-brainer)
PS 23 November: Some readers wondered (I did, too) whether the position of the 10-move no-brainer is legal. It is, says Elkies: "One pawn capture on a side yields three promotable pawns (a6xb7 and c3xd2, with White promoting bbc and Black add); and two piece captures on a side give four more promoting pawns (e6xf7, g6xh7, promote ffhh; f3xe2, h3xg2, promote eegg)."
Henrik Juel: The position is indeed legal, but Noam's explanation of seven white and seven black promotions might be clarified
By 'pawn capture' he means PxP, and by 'piece capture' he means that an officer is captured by a pawn
e6xLf7 and g6xLh7 are not both possible here, as the two missing black officers have different square colors, but the latter capture could be g5xLh6 after Black has played Ph7-h5 (2018-11-02)
James Malcom: See the 3 ply longer P1181668. (2021-02-06)
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Keywords: Aristocrat, No-brainer, Consecutive checks (19), Construction task, Non-standard material
Genre: n#
FEN: 1q2B2q/2q1B1q1/3qkq2/qrr1rRRQ/3QKQ2/2Q3Q1/1Q2n2Q/Q3n3
Input: HBae, 2010-12-04
Last update: James Malcom, 2021-02-07 more...
6 - P1261570
Noam D. Elkies
S StrateGems 10/2001
P1261570
(16+1)
Last move?
R: 1. 0-0 dann 1. Dc4 Kg2 2. Df1# z.B.
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BTM the game is stalemate, WTM the game is dead.
If Black moved last it was R: 0. Kh4-h3 g2-g3+ retropat. So White moved last.
All missing pieces were captured by wP, and none can be undone immediately, even wPb3 & wPh7. However there is a try R: 0. Be8(f7)-h5? Kh4-h3 1. g2-g3+ Kh5-h4 2. B~-e8+. But then 0. ... Kh4-h3 was mandatory into DP, as White can't relieve the looming stalemate. The only solution is R: 0. ... 0-0 1. Kg2-h3, with many alternatives: basically anything but Kf1, Rg1 or Ne3, as Black must be allowed to respond Kg2. There is unique shortest “ghost play” h#1.5 living alternative to castling.
Objective: Type A Last move with uncastling
Henrik Juel: I see that retracting a2xb3 or g6xPh7 is no good
But R: 0.Le8-h5 Kh4-h3 1.g2-g3+ Kh5-h4 2.Sf7-e5+ Kh4-h5 3.e5xDf6 seems OK
Where is 'the looming stalemate'? (2022-04-09)
A.Buchanan: Retracting 1. Le8-h5 Kh4-h3 puts us in a position where Black’s move is mandatory and whatever White then plays, the position is stalemated (2022-04-10)
A.Buchanan: So in this line, the initial dead position was two single moves ago. One single move from dead position would suffice to show that Le8-h5 is not possible. (2022-04-10)
comment
Keywords: Dead Position, Castling, Last Move?, Type A, Rex solus (S)
Genre: Retro
FEN: 7B/6PP/5P2/4N1PB/5QN1/1P3RPk/5P1P/5RK1
Reprints: 40 The Puzzling Side of Chess 145, p. 3, 07/04/2018
Input: A.Buchanan, 2013-02-02
Last update: A.Buchanan, 2022-04-09 more...
7 - P1373415
Noam D. Elkies
chess.stackexchange.com 12/3/2020
P1373415
(6+11)
#20
1. Sg5+! hxg5 2. Kf3 Kh6 3. Kg2 Kh7 4. Kxh1 Kh6 5. Kg2 Kh7 6. Kf3 Kh6 7. Ke4 Kh7 8. Kd5 Kh6 9. Kc6 Kh7 10. Kb7 Kh6 11. Kxa7 Kh7 12. Kxa6 Kh6 13. Kxa5 Kh7 14. Kxa4 Kh6 15. b4 Kh7 16. b5 Kh6 17. b6 Kh7 18. b7 Kh6 19. b8=D Kh7 20. Dh2#
19. ... Lh7 20. Df8#
play all play one stop play next play all
https://chess.stackexchange.com/a/28841/15543
James Malcom: This is a wildly original problem as far as I can tell. Any anticipations or similar problems? (2020-03-14)
Gerald Ettl: 19.-Lh7 20.Df8#,Dh2# unbedeutender Dual. (2020-03-15)
Olaf Jenkner: Kein Dual, weil 19 ... Lh7 nicht die Drohung Dh2# pariert. (2020-03-15)
Gerald Ettl: Ich bezog mich auf das Wort -Dual- auf den ogigen Kommentar. (der jetzt geloescht ist) (2020-11-18)
Gerald Ettl: Ja, es ist kein Dual. (2020-11-18)
comment
Keywords: Checking key, Excelsior white, Sacrifice key, Promotion (D)
Genre: n#
FEN: 6bn/p4p1k/p4Ppp/p7/p3K1P1/P4N2/1P6/7n
Input: James Malcom, 2020-03-14
Last update: Gunter Jordan, 2023-02-05 more...
8 - P1389167
Noam D. Elkies
Andrew Buchanan

v Retros mailing list 21/12/2012
NDE, version AB
P1389167
(3+6)
#1
b) Capture the King: win in 3 moves
a) 1. Sg3#
b) 1. Lf2 e1=D,L,T,S 2. Sg3 Db4,~ 3. Sxh1
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more ...
comment
Keywords: Capture the King, Stalemate dissolution
Genre: 3#, Fairies
FEN: 8/8/8/5N2/K7/8/4p1pp/4Bbrk
Reprints: chess.stackexchange.com 2/5/2018
Discord Chess Problems & Studies Server 2/5/2021
Input: A.Buchanan, 2021-05-02
Last update: Alfred Pfeiffer, 2021-08-02 more...
9 - P1389168
Noam D. Elkies
Andrew Buchanan

Retros mailing list 21/12/2012
NDE, version AB
P1389168
(3+7)
#1
b) Capture the King: win in 3 moves (2 solutions)
a) 1. Sf7#
b1) 1. Kg4! g5 2. Sf7 Lf5,L~ 3. Sxh8
1. Kf4,Kh4? g5 2. Sf7 gxf4,gxh4!
b2) 1. Sxg6! Lxg6 2. Kxg6 Kh7 3. Kxh7
1. Sf7=,S~=?
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more ...
comment
Keywords: Capture the King, Stalemate dissolution
Genre: 3#, Fairies
FEN: 5brk/4p1pb/4P1p1/4N1K1/8/8/8/8
Reprints: Discord Chess Problems & Studies Server 2/5/2021
Input: A.Buchanan, 2021-05-02
Last update: A.Buchanan, 2021-10-24 more...
10 - P1407174
Noam D. Elkies
Retros mailing list 01/01/2023
P1407174
(16+16) C+
PG in 10.0
How many solutions?
1. e4 e5 2. Ke2 Df6 3. Kd3 Db6 4. h4 d6 5. Th3 Sd7 6. Kc4 Le7 7. Te3 Sf8 8. Kd5 Lf6 9. Lc4 Ld7 10. Se2 Se7# for example
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2023 solutions
Henrik Juel: Surely, there are 2023 solutions
But how do you compute it? (2023-01-08)
Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 Lösungen: 2023 sind bestätigt!
Wie kommt man auf sowas? Interessiert auch mich. (2023-01-09)
A.Buchanan: White & Black play are almost independent. Because Black's first move is e5, wK route is determined. It's nearly C(10,3), but wRd3 would block e2-e4, so subtract one solution to make 120-1 = 119 = 7x17. Black's play is nearly as simple: C(9,2) fails due to collision on f8 3 times, and due to collision on f6 1 time, so 21-3-1 = 17. Note the final move is checkmate, a signature flourish that Noam likes to apply (2023-01-09)
comment
Keywords: Path enumeration (year), Non-Unique Proof Game, Capture-free
Genre: Retro, Mathematics
Computer test: C+ Jacobi v0.7.6 beta1 Lösungen: 2023 sind bestätigt!
FEN: r3kn1r/pppbnppp/1q1p1b2/3Kp3/2B1P2P/4R3/PPPPNPP1/RNBQ4
Input: A.Buchanan, 2023-01-08
Last update: A.Buchanan, 2024-01-02 more...
11 - P1408506
Noam D. Elkies
StrateGems 1, p. 29, 01-02/1998
P1408506
(15+14) C+
BP in 8.5
1. e4 a5 2. La6 bxa6 3. e5 Lb7 4. e6 Dc8 5. exf7+ Kd8 6. fxg8=L Ke8 7. c3 Dd8 8. Db3 Lc8 9. Lf7#
play all play one stop play next play all
Originalquelle lt. SG 1: Retros list 1998
Henrik Juel: C+ Stelvio 1.0 (2023-03-25)
comment
Keywords: Excelsior white, Phoenix, Switchback (kdl), Rückkehr nach Umwandlung (B/L), under-promotion (L)
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnbqkb1r/2pppBpp/p7/p7/8/1QP5/PP1P1PPP/RNB1K1NR
Input: Gunter Jordan, 2023-03-25
Last update: Silvio Baier, 2023-03-27 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (4)
HBae (1)
A.Buchanan (4)
James Malcom (1)
Gunter Jordan (1)