9 problem(s) found in 8372 milliseconds (displaying 9 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND S='The Problemist Supplement' AND G='Retro'] [download as LaTeX]
1. e3 Sf6 2. Lb5 Sd5 3. Lc6 dxc6 4. Ke2 Dd6 5. Kd3 Dg3 6. hxg3 h6 7. Txh6 f5 8. Tf6 Th4 9. Se2 Tc4 10. Dh1 Tc3+ 11. bxc3 Sb6 12. La3 Sc4 13. Ld6 Sa5 14. Sa3 Sb3 15. Tb1 Sd4 16. Tb4 Se6 17. Tg4 Sd8 18. Tgg6 Sf7 19. g4 Sh6 20. Sg3 Sg8
12-zügiger Rundlauf des sSg8, der früh nach d5 spielen muß, um Schachschutz zu geben.
12-zügiger Rundlauf des sSg8, der früh nach d5 spielen muß, um Schachschutz zu geben.
Keywords: Unique Proof Game, Pure Round Trip (s12), Check Protection
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnb1kbn1/ppp1p1p1/2pB1RR1/5p2/6P1/N1PKP1N1/P1PP1PP1/7Q
Reprints: (B) Quartz 28 07-09/2005
Input: Gerd Wilts, 2006-03-12
Last update: Silvio Baier, 2023-03-02 more...
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnb1kbn1/ppp1p1p1/2pB1RR1/5p2/6P1/N1PKP1N1/P1PP1PP1/7Q
Reprints: (B) Quartz 28 07-09/2005
Input: Gerd Wilts, 2006-03-12
Last update: Silvio Baier, 2023-03-02 more...
2 - P1068380
Michel Caillaud
The Problemist Supplement 2001-2002
4. ehrende Erwähnung, TT3
(15+13) C+
BP in 21,0
Michel Caillaud
The Problemist Supplement 2001-2002
4. ehrende Erwähnung, TT3
(15+13) C+
BP in 21,0
1. e4 a5 2. Ke2 Ta6 3. Kf3 Tc6 4. Kg4 Tc3 5. dxc3 Sc6 6. Le3 Sa7 7. Lc5 Sb5 8. Dd4 Sd6 9. Sd2 Sf5 10. Te1 d6 11. Te3 Le6 12. Th3 Lb3 13. Th6 gxh6 14. cxb3 Lg7 15. b4 Le5 16. Sb3 Lg3 17. hxg3 Sg7 18. Th5 Se6 19. Kh3 Sf8 20. Kh2 Sd7 21. Kh1 Sb8
10-zügiger Rundlauf des sSb8 zwecks Schachschutz auf f5
10-zügiger Rundlauf des sSb8 zwecks Schachschutz auf f5
Henrik Juel: Natch 3.1 produced little in an hour (2018-12-16)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:34:52 Minuten. (hh:mm:ss)
Keine Lösung: BP 20.0, BP 20.5. Histogramm 44/0k. (2023-03-16)
comment
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:34:52 Minuten. (hh:mm:ss)
Keine Lösung: BP 20.0, BP 20.5. Histogramm 44/0k. (2023-03-16)
comment
Keywords: Unique Proof Game, Pure Round Trip (s10), Check Protection
Genre: Retro
Computer test: Stelvio 1.11
FEN: 1n1qk1nr/1pp1pp1p/3p3p/p1B4R/1P1QP3/1NP3P1/PP3PP1/5BNK
Reprints: (D) Quartz 28 07-09/2005
Input: Gerd Wilts, 2006-03-12
Last update: Silvio Baier, 2023-03-20 more...
Genre: Retro
Computer test: Stelvio 1.11
FEN: 1n1qk1nr/1pp1pp1p/3p3p/p1B4R/1P1QP3/1NP3P1/PP3PP1/5BNK
Reprints: (D) Quartz 28 07-09/2005
Input: Gerd Wilts, 2006-03-12
Last update: Silvio Baier, 2023-03-20 more...
1. a4 e5 2. a5 Dg5 3. a6 Sf6 4. axb7 Sa6 5. b8=S Lb7 6. Sc6 dxc6 7. h4 0-0-0 8. hxg5 Td3 9. exd3 Se4 10. Dg4+ f5 11. gxf6ep+
Keywords: Unique Proof Game, En passant, Ceriani-Frolkin Theme (s), Valladao Task (wws), Promotion (S), Castling (sg)
Genre: Retro
Computer test: Euclide 0.93
FEN: 2k2b1r/pbp3pp/n1p2P2/4p3/4n1Q1/3P4/1PPP1PP1/RNB1KBNR
Input: Gerd Wilts, 2007-01-07
Last update: A.Buchanan, 2021-05-26 more...
Genre: Retro
Computer test: Euclide 0.93
FEN: 2k2b1r/pbp3pp/n1p2P2/4p3/4n1Q1/3P4/1PPP1PP1/RNB1KBNR
Input: Gerd Wilts, 2007-01-07
Last update: A.Buchanan, 2021-05-26 more...
1. ... e3 2. Da5 Df3 3. b6 Dxa8#
Numerous retro tries but none distinct
Numerous retro tries but none distinct
The task here is to maximize the number of necessary units in a homebase h#.
Henrik Juel: 1... e3 2.Da5 Df3 3.b6 Dxa8#
White (not Black) has no last move, so he has the move, and the stipulation is really h#2.5 (2020-09-23)
A.Buchanan: Can shift sBd7 to c7 for an entirely different mate, but alas one of sBg7h7 might be removed without losing soundness. (2020-09-24)
comment
Henrik Juel: 1... e3 2.Da5 Df3 3.b6 Dxa8#
White (not Black) has no last move, so he has the move, and the stipulation is really h#2.5 (2020-09-23)
A.Buchanan: Can shift sBd7 to c7 for an entirely different mate, but alas one of sBg7h7 might be removed without losing soundness. (2020-09-24)
comment
Keywords: Homebase (2), No legal last move for White
Genre: h#, Retro
Computer test: C+ Popeye v4.85 + retro thinking
FEN: r2qk1nr/pp1ppppp/8/8/8/8/1PPPPPP1/2BQKB2
Input: A.Buchanan, 2020-09-23
Last update: A.Buchanan, 2023-12-07 more...
Genre: h#, Retro
Computer test: C+ Popeye v4.85 + retro thinking
FEN: r2qk1nr/pp1ppppp/8/8/8/8/1PPPPPP1/2BQKB2
Input: A.Buchanan, 2020-09-23
Last update: A.Buchanan, 2023-12-07 more...
5 - P1380264
Norbert Geissler
3 The Problemist Supplement 154, p. 646, 05/2018
(3+7)
h#4
Wie viele Lösungen?
Norbert Geissler
3 The Problemist Supplement 154, p. 646, 05/2018
(3+7)
h#4
Wie viele Lösungen?
One solution only!
1. Sh6 f4 2. 0-0 f5 3. Kh8 f6 4. Tg8 Txh6#
1. Th7 0-0? 2. Td7 Ta1 3. De7 Txa8 4. Kd8 Txb8# castling illegal
The possible second solution 1. Th7 0-0 2. Td7 Ta1 3. De7 Txa8 4. Kd8 Txb8#
is illegal as white castling is not allowed (last move of white was made by King or Rook)
1. Sh6 f4 2. 0-0 f5 3. Kh8 f6 4. Tg8 Txh6#
1. Th7 0-0? 2. Td7 Ta1 3. De7 Txa8 4. Kd8 Txb8# castling illegal
The possible second solution 1. Th7 0-0 2. Td7 Ta1 3. De7 Txa8 4. Kd8 Txb8#
is illegal as white castling is not allowed (last move of white was made by King or Rook)
6 - P1394484
Andrew Buchanan
A The Problemist Supplement 174, p. 182, 09/2021
Motto="U for Uplex"
(4+3) C+
h#2.5 Duplex
Andrew Buchanan
A The Problemist Supplement 174, p. 182, 09/2021
Motto="U for Uplex"
(4+3) C+
h#2.5 Duplex
w) 1. a2 a6 2. Ka3 Ta5#
s) 1. b2 Td5 2. b1=D Td3 3. Db2#
BTM in both twins.
Numerous retro tries but none distinct in the retro twin w).
s) 1. b2 Td5 2. b1=D Td3 3. Db2#
BTM in both twins.
Numerous retro tries but none distinct in the retro twin w).
AB: Duplex means that there is a twin where B/W roles are reversed. If we can deduce who must have the move then, e.g. in a helpmate, one of those twins will lose the first single move. So here it's Black to move, and the twins are BWBWB# (Black checkmating White) and BWBW# (White checkmating Black). "Uplex" is not a Fairy Condition - it's just an identifier of an obvious idea for retro-active compositions, which curiously hasn't been explored before, as far as Geoff Foster and I can see.
Henrik Juel: Thanks for the explanation, Andrew
Here Black has no last move, so he has the move
1.b2 Td5 2.b1=D Td3 3.Db2#
1.a2 a6 2.Ka3 Ta5#
C+ Popeye 4.61 (using 'sti h#2.5 opt hal' and 'sti h#2') (2021-10-09)
comment
Henrik Juel: Thanks for the explanation, Andrew
Here Black has no last move, so he has the move
1.b2 Td5 2.b1=D Td3 3.Db2#
1.a2 a6 2.Ka3 Ta5#
C+ Popeye 4.61 (using 'sti h#2.5 opt hal' and 'sti h#2') (2021-10-09)
comment
Keywords: No legal last move for Black, Miniature, Character problem (U)
Genre: h#, Retro
Computer test: HC+ Last move analysis + Popeye 4.61
FEN: 8/8/8/P1R5/k1P5/ppK5/8/8
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
Genre: h#, Retro
Computer test: HC+ Last move analysis + Popeye 4.61
FEN: 8/8/8/P1R5/k1P5/ppK5/8/8
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
7 - P1394485
Andrew Buchanan
B The Problemist Supplement 174, p. 182, 09/2021
(16+15) C+
h#2.5 Duplex
Andrew Buchanan
B The Problemist Supplement 174, p. 182, 09/2021
(16+15) C+
h#2.5 Duplex
w) 1. Se6 Sd5 2. Sd8 Sxc7#
s) 1. Sxd1 Kxd1 2. Se4 Se1 3. Sxf2#
BTM in both twins.
Numerous retro tries but none distinct in the retro twin w).
s) 1. Sxd1 Kxd1 2. Se4 Se1 3. Sxf2#
BTM in both twins.
Numerous retro tries but none distinct in the retro twin w).
Henrik Juel: The total number of white moves in any proof game is even, and the number of black move is odd
The different parities imply that White made the last move, so it is Black to move
1.Sxd1 Kxd1 2.Se4 Se1 3.Sxf#
1.Se6 Sd5 2.Sd8 Sxc7#
C+ Popeye 4.61 (2021-10-09)
comment
The different parities imply that White made the last move, so it is Black to move
1.Sxd1 Kxd1 2.Se4 Se1 3.Sxf#
1.Se6 Sd5 2.Sd8 Sxc7#
C+ Popeye 4.61 (2021-10-09)
comment
Keywords: No legal last move for Black, Parity Argument
Genre: h#, Retro
Computer test: HC+ Parity counting + Popeye 4.61
FEN: r1b1kb1r/pppppppp/8/2n5/8/2nNN3/PPPPPPPP/R1BQKB1R
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
Genre: h#, Retro
Computer test: HC+ Parity counting + Popeye 4.61
FEN: r1b1kb1r/pppppppp/8/2n5/8/2nNN3/PPPPPPPP/R1BQKB1R
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
8 - P1394486
Geoff Foster
Andrew Buchanan
C The Problemist Supplement 174, p. 182, 09/2021
(16+16) C+
h#2.5 Duplex
Geoff Foster
Andrew Buchanan
C The Problemist Supplement 174, p. 182, 09/2021
(16+16) C+
h#2.5 Duplex
w) 1. e5 Sxg7+ 2. Ke7 Sd5#
s) 1. g6 d3 2. Lh6 Kd2 3. Sf3#
BTM in both twins
Numerous retro tries but none distinct in the retro twin w).
s) 1. g6 d3 2. Lh6 Kd2 3. Sf3#
BTM in both twins
Numerous retro tries but none distinct in the retro twin w).
Henrik Juel: A parity argument shows that it is Black to move
1.g6 d3 2.Lh6 Kd2 3.Sf3#
1.e5 Sxg7# 2.Ke7 Sd5#
C+ Popeye 4.61 (2021-10-09)
comment
1.g6 d3 2.Lh6 Kd2 3.Sf3#
1.e5 Sxg7# 2.Ke7 Sd5#
C+ Popeye 4.61 (2021-10-09)
comment
Keywords: No legal last move for Black, Parity Argument, Capture-free
Genre: h#, Retro
Computer test: HC+ Parity counting + Popeye 4.61
FEN: r1bqkb1r/pppppppp/3n4/6nN/8/2N5/PPPPPPPP/R1BQKB1R
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
Genre: h#, Retro
Computer test: HC+ Parity counting + Popeye 4.61
FEN: r1bqkb1r/pppppppp/3n4/6nN/8/2N5/PPPPPPPP/R1BQKB1R
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
w) 1. Sb4 Sg5 2. Sc6 Se6 3. Sd8 Sxc7#
s) 1. Sb4 Sf3 2. Sd3 Se1 3. Sxf2#
BTM in both twins
Numerous retro tries but none distinct in the retro twin s).
s) 1. Sb4 Sf3 2. Sd3 Se1 3. Sxf2#
BTM in both twins
Numerous retro tries but none distinct in the retro twin s).
Henrik Juel: A parity argument shows that it White to move
Popeye 4.61 found lots of solutions with 'sti h#3 opt hal' and none with 'sti h#2.5' (2021-10-09)
Henrik Juel: Here are the correct details of the parity argument
White has made an odd number of moves (K odd, TT odd, SS even, P odd)
Black has mad an even number of moves (K even, TT even, SS even, PP even)
So White made last move, and it is Black to move
1.Sb4 Sg5 2.Sc6 Se6 3.Sd8 Sxc7# (White mates, 'h#3')
1.Sb4 Sf3 2.Sd3 Se1 3.Sxf2# (Black mates, 'h#2.5 opt hal')
C+ Popeye 4.61 (2021-10-09)
comment
Popeye 4.61 found lots of solutions with 'sti h#3 opt hal' and none with 'sti h#2.5' (2021-10-09)
Henrik Juel: Here are the correct details of the parity argument
White has made an odd number of moves (K odd, TT odd, SS even, P odd)
Black has mad an even number of moves (K even, TT even, SS even, PP even)
So White made last move, and it is Black to move
1.Sb4 Sg5 2.Sc6 Se6 3.Sd8 Sxc7# (White mates, 'h#3')
1.Sb4 Sf3 2.Sd3 Se1 3.Sxf2# (Black mates, 'h#2.5 opt hal')
C+ Popeye 4.61 (2021-10-09)
comment
Keywords: No legal last move for Black, Parity Argument
Genre: h#, Retro
Computer test: HC+ Parity counting + Popeye 4.61
FEN: 2b1kbrn/rppppppN/p6p/8/8/P7/nPPPPPPP/1RBK1BNR
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
Genre: h#, Retro
Computer test: HC+ Parity counting + Popeye 4.61
FEN: 2b1kbrn/rppppppN/p6p/8/8/P7/nPPPPPPP/1RBK1BNR
Input: A.Buchanan, 2021-10-08
Last update: A.Buchanan, 2023-12-06 more...
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The problems of this query have been registered by the following contributors:
Gerd Wilts (3)A.Buchanan (6)
Keine Lösung: BP 19.0, BP 19.5. (2023-03-01)
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