27 problem(s) found in 3501 milliseconds (displaying 27 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND S='Schachzeitung' AND K='Unterverwandlung im Schlüsselzug'] [download as LaTeX]
1. c8=L+! Kg6 2. Lh3 Kh5,Kh6 3. Lf5#
Keywords: Brian Stephenson Collection (19708), under-promotion key (L), Checking key, Minimal (b), Anderssen-Verstellung, Zugzwang-Goal
Genre: 3#
Computer test: SCHRECKE: popeye 4.89
FEN: 8/2P1Bp2/5P2/4PkN1/5P2/2K3P1/7R/8
Reprints: 22 Chess Player's Chronicle 04/1849
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-24 more...
Genre: 3#
Computer test: SCHRECKE: popeye 4.89
FEN: 8/2P1Bp2/5P2/4PkN1/5P2/2K3P1/7R/8
Reprints: 22 Chess Player's Chronicle 04/1849
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-24 more...
1. f8=L! Sf5 2. Lf2
1. ... Se4 2. Lb4
1. ... Sf7 2. Lf6
1. ... Se8 2. Ld8
1. ... Se4 2. Lb4
1. ... Sf7 2. Lf6
1. ... Se8 2. Ld8
Keywords: Brian Stephenson Collection (22694), under-promotion key (L), Grab (sS)
Genre: n#
FEN: 8/5P2/1N1n4/8/2P4B/8/Pp1p4/krbQ3K
Reprints: 1167 FIDE Album 1914-1944/II , p. 214, 1972
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-02-15 more...
Genre: n#
FEN: 8/5P2/1N1n4/8/2P4B/8/Pp1p4/krbQ3K
Reprints: 1167 FIDE Album 1914-1944/II , p. 214, 1972
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-02-15 more...
3 - P1040372
Jesse Paul Taylor
La Strategie 1878
Pariser Problemturnier
Sendung Nr. 32
Motto: A Thought
(12+7)
#3
Jesse Paul Taylor
La Strategie 1878
Pariser Problemturnier
Sendung Nr. 32
Motto: A Thought
(12+7)
#3
1. b8=S! Ke7 2. d8=S Kf6 3. g8=S#
Keywords: Brian Stephenson Collection (25329), under-promotion key (S), under-promotion in mating move (S), under-promotion (S), Line closing
Genre: 3#
FEN: 3k3K/NP1P2Pp/1P1N2bR/3pb1r1/1P1p3B/3P4/8/4R3
Reprints: Deutsche Schachzeitung , p. 207, 07/1879
Elementary Chess Problems [Taylor] 1880
III. Die Schwalbe 4, p. 90, 04/1970
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-09-26 more...
Genre: 3#
FEN: 3k3K/NP1P2Pp/1P1N2bR/3pb1r1/1P1p3B/3P4/8/4R3
Reprints: Deutsche Schachzeitung , p. 207, 07/1879
Elementary Chess Problems [Taylor] 1880
III. Die Schwalbe 4, p. 90, 04/1970
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-09-26 more...
1. f8=S! droht 2. Sc6#
1. ... Td3,Sg4 2. Sg6#
1. ... Tg4 2. Sf3#
1. ... Sd3 2. Sd7#
1. ... d5 2. cxb8=D,L#
1. ... Td3,Sg4 2. Sg6#
1. ... Tg4 2. Sf3#
1. ... Sd3 2. Sd7#
1. ... d5 2. cxb8=D,L#
Keywords: Brian Stephenson Collection (40278), under-promotion key (S), Promotion in the mating move (D,L)
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: 1b6/rQP1pP1B/p2p3n/2n1kp1N/3N3R/6r1/1p6/1K1R4
Reprints: KunstschaCH 2001
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-11-05 more...
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: 1b6/rQP1pP1B/p2p3n/2n1kp1N/3N3R/6r1/1p6/1K1R4
Reprints: KunstschaCH 2001
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-11-05 more...
1. d8=S! Kd4 2. Se4 Se6 3. Sdc6#
1. ... Kf6 2. Sdc6 g4 3. Se4#
1. ... Sh5 2. Sdc6+ Kf6 3. Se8#
1. ... Kf6 2. Sdc6 g4 3. Se4#
1. ... Sh5 2. Sdc6+ Kf6 3. Se8#
Keywords: Brian Stephenson Collection (40308), under-promotion key (S)
Genre: 3#
FEN: 8/3PN1n1/3N2P1/2PPk1p1/5p2/1P3P2/4K3/8
Reprints: 70 The White Knights , p. 90, 1917
Wolfgang Pauly. Challenge of a Legacy 2001
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-03-12 more...
Genre: 3#
FEN: 8/3PN1n1/3N2P1/2PPk1p1/5p2/1P3P2/4K3/8
Reprints: 70 The White Knights , p. 90, 1917
Wolfgang Pauly. Challenge of a Legacy 2001
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-03-12 more...
1. a8=L! Lxf3 2. Lxf3 Kf1 3. Ta1#
1. ... Lg2 2. Lf2+ Kf1 3. Lxg2#
1. ... Lg2 2. Lf2+ Kf1 3. Lxg2#
Keywords: Miniature Collection (0038985), Minimal, Miniature, under-promotion key (L), Stalemate avoidance
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/P7/8/8/8/K4B2/R7/4k1Bb
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-04-20 more...
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/P7/8/8/8/K4B2/R7/4k1Bb
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-04-20 more...
* 1. ... Kxe8 2. b8=D#
1. b8=S! Kxe8 2. Dg8#
1. b8=S! Kxe8 2. Dg8#
Keywords: Miniature Collection (0005846), Minimal, Miniature, Exchange of Promotions, under-promotion key, Promotion in the mating move (D im Satz)
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: K3Nk2/PP2p3/4Q3/8/8/8/8/8
Reprints: 3 Arbeiter-Schachzeitung (Chemnitz) 8, p. 233, 08/1928
23 Schachminiaturen Zweizüger , p. 16, 1965
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-01-12 more...
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: K3Nk2/PP2p3/4Q3/8/8/8/8/8
Reprints: 3 Arbeiter-Schachzeitung (Chemnitz) 8, p. 233, 08/1928
23 Schachminiaturen Zweizüger , p. 16, 1965
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-01-12 more...
1. c8=L Kc2 2. Lg4
steingetreu: Karol Piltz, Ilustracja, 1924
steingetreu: Karol Piltz, Ilustracja, 1924
Keywords: Miniature Collection (0043754), under-promotion key (T), Rex solus (s), Miniature
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/2P5/8/8/1K6/Q7/8/1k6
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-07-11 more...
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/2P5/8/8/1K6/Q7/8/1k6
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-07-11 more...
1. g8=D? Ka1 2. Tc2 Kb1 3. Da2#
1. ... Kb1 2. Dg2 Ka1 3. Tc1#
1. ... Ka2 2. Tc2+ Kb1,Ka1,Ka3 3. Da2#
2. Tb4+ Ka1 3. Da8#
2. ... Ka3 3. Db3#,Da8#
1. ... Kb3 2. Dg2 Ka3 3. Tc3#
1. ... Ka3! 2. Tb4 patt
1. g8=T! Ka1,Ka3 2. Tb4 ... 3. Ta8#
1. ... Kb1 2. Tg2 Ka1 3. Tc1#
1. ... Ka2 2. Tb4 ... 3. Ta8#
1. ... Kb3 2. Tg2 Ka3 3. Tc3#
1. ... Kb1 2. Dg2 Ka1 3. Tc1#
1. ... Ka2 2. Tc2+ Kb1,Ka1,Ka3 3. Da2#
2. Tb4+ Ka1 3. Da8#
2. ... Ka3 3. Db3#,Da8#
1. ... Kb3 2. Dg2 Ka3 3. Tc3#
1. ... Ka3! 2. Tb4 patt
1. g8=T! Ka1,Ka3 2. Tb4 ... 3. Ta8#
1. ... Kb1 2. Tg2 Ka1 3. Tc1#
1. ... Ka2 2. Tb4 ... 3. Ta8#
1. ... Kb3 2. Tg2 Ka3 3. Tc3#
Keywords: Miniature Collection (0043955), under-promotion key (T), Stalemate avoidance, Changed mates, Line opening, Miniature
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/6P1/8/1K6/2R5/8/1k6/8
Reprints: Die Wehrmacht 22 09/1937
110 Classic Chess Problems by Pioneer Composers , p. 64, 1970
442 Mattaufgaben mit drei und vier Steinen 1976
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2022-12-22 more...
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 8/6P1/8/1K6/2R5/8/1k6/8
Reprints: Die Wehrmacht 22 09/1937
110 Classic Chess Problems by Pioneer Composers , p. 64, 1970
442 Mattaufgaben mit drei und vier Steinen 1976
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2022-12-22 more...
10 - P1128044
Julius R. Neukomm
1 Schachkongress Teplitz-Schönau im Oktober 1922 , p. 433, 1923
(6+1)
#2
Julius R. Neukomm
1 Schachkongress Teplitz-Schönau im Oktober 1922 , p. 433, 1923
(6+1)
#2
1. e8=T
Keywords: Miniature Collection (0009915), under-promotion key (T)
Genre: 2#
FEN: 1KN5/3NP3/2k5/5P2/2B5/8/8/8
Reprints: 1 Arbeiter-Schachzeitung (Chemnitz) 8, p. 233, 08/1928
Input: Felber, Volker, 2010-09-11
Last update: Rainer Staudte, 2022-04-18 more...
Genre: 2#
FEN: 1KN5/3NP3/2k5/5P2/2B5/8/8/8
Reprints: 1 Arbeiter-Schachzeitung (Chemnitz) 8, p. 233, 08/1928
Input: Felber, Volker, 2010-09-11
Last update: Rainer Staudte, 2022-04-18 more...
1. fxg8=T Ka2 2. Tg3 Ka1 3. Ta3#
Keywords: Miniature Collection (0045648), Capture key, under-promotion key, under-promotion (T), Switchback (k), Corner mate, Ideal mate
Genre: 3#
FEN: 6b1/5P2/8/8/8/8/8/k1K5
Reprints: 36 Schachmatnyje kwartety , p. 22, 1983
Input: Felber, Volker, 2010-09-11
Last update: Gunter Jordan, 2022-04-25 more...
Genre: 3#
FEN: 6b1/5P2/8/8/8/8/8/k1K5
Reprints: 36 Schachmatnyje kwartety , p. 22, 1983
Input: Felber, Volker, 2010-09-11
Last update: Gunter Jordan, 2022-04-25 more...
12 - P1131296
Heinz Curth
3498 Deutsche Schachzeitung , p. 384, 11/1975
(5+2)
#3
b) wSe4->d5; c) sBd6->e5
Heinz Curth
3498 Deutsche Schachzeitung , p. 384, 11/1975
(5+2)
#3
b) wSe4->d5; c) sBd6->e5
a) 1. c8=D! Kb6 2. Sxd6
1. ... d5 2. Dc7+ Ka6 3. Sc5#
b) 1. c8=T!
c) 1. c8=S!
1. ... d5 2. Dc7+ Ka6 3. Sc5#
b) 1. c8=T!
c) 1. c8=S!
A9-4S- BUT32 BUS30 BsS2
Henrik Juel: a) double threat 1.c8=D thr. 2.Db7,Dc6
b) 1.c8=T Ka6 2.Tc7
c) 1.c8=S Ka6 2.Sc5+ (2024-01-02)
comment
Henrik Juel: a) double threat 1.c8=D thr. 2.Db7,Dc6
b) 1.c8=T Ka6 2.Tc7
c) 1.c8=S Ka6 2.Sc5+ (2024-01-02)
comment
Keywords: Miniature Collection (0046651), Minimal (b), Miniature, Promotion key (D, a)), under-promotion key (T in b), S in c))
Genre: 3#
FEN: 8/2P5/3p4/k7/P3N3/1PK5/8/8
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2024-01-02 more...
Genre: 3#
FEN: 8/2P5/3p4/k7/P3N3/1PK5/8/8
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2024-01-02 more...
1. d8=T! Kh4 2. Tg8 Kh5 3. Dh3#
1. ... Kg5 2. Tg8+
1. ... Kg5 2. Tg8+
Keywords: Miniature Collection (0050223), Miniature, Rex solus, under-promotion key (T), Stalemate avoidance
Genre: 3#
FEN: 8/3P4/4Q3/3K3k/8/8/8/8
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-07-11 more...
Genre: 3#
FEN: 8/3P4/4Q3/3K3k/8/8/8/8
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-07-11 more...
1. g8=L! Kg1 2. Se2+ Kg2 3. Ld5#
BUL30 m
vf: a1<>h1, Hermann von Gottschall, 1926, Streifzüge durch das Gebiet des Schachproblems, S.10, #21
SCHRECKE: Gottschall: P1137955 (2024-01-05)
comment
vf: a1<>h1, Hermann von Gottschall, 1926, Streifzüge durch das Gebiet des Schachproblems, S.10, #21
SCHRECKE: Gottschall: P1137955 (2024-01-05)
comment
Keywords: Miniature Collection (0051494), under-promotion key (L), Stalemate avoidance, Miniature
Genre: 3#
FEN: 8/6P1/8/8/5N2/7p/7p/4K2k
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2024-01-04 more...
Genre: 3#
FEN: 8/6P1/8/8/5N2/7p/7p/4K2k
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2024-01-04 more...
1. d8=L! Kxc8 2. Ta8+
Keywords: Miniature Collection (0053335), Miniature, Rex solus, under-promotion key (L), Stalemate avoidance
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 1kN5/R2P4/8/4K3/8/8/8/5B2
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2023-11-24 more...
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 1kN5/R2P4/8/4K3/8/8/8/5B2
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2023-11-24 more...
1. e8=T Kh5 2. Te6 Kh4 3. Th6#
Keywords: Miniature Collection (0056110), Miniature, under-promotion key (T), Rex solus (s), Kindergarten Problem
Genre: 3#
Computer test: popeye 4.87
FEN: 8/4P3/8/8/5K1k/8/6P1/8
Input: Felber, Volker, 2010-09-12
Last update: Alfred Pfeiffer, 2022-08-03 more...
Genre: 3#
Computer test: popeye 4.87
FEN: 8/4P3/8/8/5K1k/8/6P1/8
Input: Felber, Volker, 2010-09-12
Last update: Alfred Pfeiffer, 2022-08-03 more...
17 - P1173365
Hans-Christoph Krumm
Werner Speckmann
C Deutsche Schachzeitung , p. 158, 04/1977
(2+2) C+
#8
Hans-Christoph Krumm
Werner Speckmann
C Deutsche Schachzeitung , p. 158, 04/1977
(2+2) C+
#8
1. f8=T! Kg7 2. Tf1,Tf6 Kh7 3. Tf7+ Kg8 4. Kg6 h5 5. Tf4 h4 6. Txh4 Kf8 7. Te4 Kg8 8. Te8#
Keywords: Miniature Collection (0087151), Kindergarten Problem, Minimal, Miniature, under-promotion key (T), Stalemate avoidance
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 8/5P1k/7p/7K/8/8/8/8
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2023-11-23 more...
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 8/5P1k/7p/7K/8/8/8/8
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2023-11-23 more...
18 - P1380357
Hannes Baumann
14969 Schweizerische Schachzeitung 02/2014
(6+1) C+
#4
b)wBc6->a6 #3
c)+wSe5 #3
d)+wBa3 #3
Hannes Baumann
14969 Schweizerische Schachzeitung 02/2014
(6+1) C+
#4
b)wBc6->a6 #3
c)+wSe5 #3
d)+wBa3 #3
a) 1. c8=D,T? patt
1. La8? Ka6!
1. Lc8! Ka8 2. La6 Ka7 3. c8=T Kxa6 4. Ta8#
b) 1. c8=S+! Kb8 2. Se7 Ka7 3. Sc6#
c) 1. c8=L! Kb8 2. c7+ Ka7 3. Sc6#
d) 1. La6! Kxa6 2. c8=D+ Ka5 3. Da8#
2. ... Ka7 3. Db7#
1. ... Ka8 2. c8=D+ Ka7 3. Db7#
Vorgänger: P1143924
1. La8? Ka6!
1. Lc8! Ka8 2. La6 Ka7 3. c8=T Kxa6 4. Ta8#
b) 1. c8=S+! Kb8 2. Se7 Ka7 3. Sc6#
c) 1. c8=L! Kb8 2. c7+ Ka7 3. Sc6#
d) 1. La6! Kxa6 2. c8=D+ Ka5 3. Da8#
2. ... Ka7 3. Db7#
1. ... Ka8 2. c8=D+ Ka7 3. Db7#
Vorgänger: P1143924
Duplicate Diagram: P1143924, P1143924
Keywords: Rex solus (s), under-promotion key (S,L), Allumwandlung
Genre: 3#, n#
Computer test: Popeye 4.61
FEN: 8/kBPK4/2P5/2P5/2P5/8/8/8
Input: Rainer Staudte, 2020-09-27
Last update: Alfred Pfeiffer, 2020-10-02 more...
Genre: 3#, n#
Computer test: Popeye 4.61
FEN: 8/kBPK4/2P5/2P5/2P5/8/8/8
Input: Rainer Staudte, 2020-09-27
Last update: Alfred Pfeiffer, 2020-10-02 more...
1. f8=S! Scd5,Sa8,Sc6,Sb5,Sa6,Se6,Se8 2. Se6#
1. ... Sc6 2. Sxc6#
1. ... Sed5,Sf5,Seg6,Sg8,Sc8 2. Sc6#
1. ... Sf7,Shg6 2. Sexf7#
1. ... Sc6 2. Sxc6#
1. ... Sed5,Sf5,Seg6,Sg8,Sc8 2. Sc6#
1. ... Sf7,Shg6 2. Sexf7#
Keywords: Non-standard material, under-promotion key (S)
Genre: 2#
Computer test: popeye 4.85
FEN: 3k3n/2n1nP2/3N4/4N3/8/8/8/K7
Input: Rainer Staudte, 2020-11-08
Last update: Alfred Pfeiffer, 2020-11-09 more...
Genre: 2#
Computer test: popeye 4.85
FEN: 3k3n/2n1nP2/3N4/4N3/8/8/8/K7
Input: Rainer Staudte, 2020-11-08
Last update: Alfred Pfeiffer, 2020-11-09 more...
A nice range of tries, but a dual:
1. e8=T!
1. ... Kxc2 2. 0-0-0-0-0-0#
1. ... bxc2 2. Dd5,De4#
1. ... Kd4 2. De4#
1. De4+? Kxe4!
1. e8=D? Kxc2!
1. Tc4? Kxc4!
1. Tc3+? Kd4!
1. e8=T!
1. ... Kxc2 2. 0-0-0-0-0-0#
1. ... bxc2 2. Dd5,De4#
1. ... Kd4 2. De4#
1. De4+? Kxe4!
1. e8=D? Kxc2!
1. Tc4? Kxc4!
1. Tc3+? Kd4!
'DSZ': "Diese Aufgabe regt den Gedanken an, daß die itaienische freie Rochade noch viel besser hätte ausgenützt werden können, als es (ehedem) tatsächlich der Fall war."
ähnelt stark der P1277302
A.Buchanan: @Henrik how should the dual here impact C+ status we assign? What's the general principle we curators should apply, to avoid us having to make subjective judgements? (2021-01-07)
A.Buchanan: My own simple-minded aesthetic says this is a major dual, because one mate achieves no individual expression elsewhere (2021-01-07)
Henrik Juel: The easiest principle is to say that C+ means completely correct: no cooks and no duals
I would permit short mates, because they occur as a result of suboptimal defense, and double threats, if they do not materialize as duals
But it seems fair also to permit minor duals, including promotion mate duals like TD og LD
So I would not label this problem C+ (2021-01-08)
A.Buchanan: Thank you Henrik, for your thoughtful response. A lot is bundled into one bit of information: the value of the C+? flag. I went back to the Codex to learn more. I think C+ should mean (1) it's been tested & (2) it is sound. Sound (which we don't have in PDB yet) for an antagonistic problem (i.e. d# or s#) means three things: (1) there is a solution (2) there's no cook & (3) there's a defence which forces the specified number of moves. Legality doesn't impact soundness, and for antagonistic problems, neither do duals.
The Codex says there is a lot of judgement involved in assessing the impact of duals in a d#. "C+?" is a result of computer analysis, and I don't think there should be any curator subjectivity in determining its value. I think the answer is to have "duals" as a new separate field so that your valuable analyses aren't lost in conversation, and people can understand the spectrum of quality. In the end, maybe people will be able to set up in their profile their personal preference for dual tolerance, but that's probably some way ahead. I think there are naturally core fields (like cooked?, legal?, tested?) and derived fields (like sound? C+?, HC+?) whose values depend on the core ones. I've sent some notes to Gerd along these lines to see what he thinks. Any thoughts yourself? (2021-01-08)
comment
ähnelt stark der P1277302
A.Buchanan: @Henrik how should the dual here impact C+ status we assign? What's the general principle we curators should apply, to avoid us having to make subjective judgements? (2021-01-07)
A.Buchanan: My own simple-minded aesthetic says this is a major dual, because one mate achieves no individual expression elsewhere (2021-01-07)
Henrik Juel: The easiest principle is to say that C+ means completely correct: no cooks and no duals
I would permit short mates, because they occur as a result of suboptimal defense, and double threats, if they do not materialize as duals
But it seems fair also to permit minor duals, including promotion mate duals like TD og LD
So I would not label this problem C+ (2021-01-08)
A.Buchanan: Thank you Henrik, for your thoughtful response. A lot is bundled into one bit of information: the value of the C+? flag. I went back to the Codex to learn more. I think C+ should mean (1) it's been tested & (2) it is sound. Sound (which we don't have in PDB yet) for an antagonistic problem (i.e. d# or s#) means three things: (1) there is a solution (2) there's no cook & (3) there's a defence which forces the specified number of moves. Legality doesn't impact soundness, and for antagonistic problems, neither do duals.
The Codex says there is a lot of judgement involved in assessing the impact of duals in a d#. "C+?" is a result of computer analysis, and I don't think there should be any curator subjectivity in determining its value. I think the answer is to have "duals" as a new separate field so that your valuable analyses aren't lost in conversation, and people can understand the spectrum of quality. In the end, maybe people will be able to set up in their profile their personal preference for dual tolerance, but that's probably some way ahead. I think there are naturally core fields (like cooked?, legal?, tested?) and derived fields (like sound? C+?, HC+?) whose values depend on the core ones. I've sent some notes to Gerd along these lines to see what he thinks. Any thoughts yourself? (2021-01-08)
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Keywords: Staugaard castling, under-promotion key (T), Castling as mating move, Miniature, Joke, Minimal, Rokagogo
Genre: 2#, Fairies
Computer test: WinChloe rokagogo is sufficient to test soundness, although there is a dual
FEN: 8/4P3/8/8/8/1p1k4/1PR5/4K2Q
Input: Mario Richter, 2020-11-13
Last update: A.Buchanan, 2024-01-18 more...
Genre: 2#, Fairies
Computer test: WinChloe rokagogo is sufficient to test soundness, although there is a dual
FEN: 8/4P3/8/8/8/1p1k4/1PR5/4K2Q
Input: Mario Richter, 2020-11-13
Last update: A.Buchanan, 2024-01-18 more...
Ohne den wS ginge Matt in 2 durch 1. b8=D, also muss der wS verschwinden.
1. d8=S Sd6 2. Sf7+ Sxf7 3. Se3 Sd6 4. Sf5+ Sxf5 5. b8=D
Hat eine starke persönliche Note und gehört zu meinen Lieblingen (Erich Zepler)
1. d8=S Sd6 2. Sf7+ Sxf7 3. Se3 Sd6 4. Sf5+ Sxf5 5. b8=D
Hat eine starke persönliche Note und gehört zu meinen Lieblingen (Erich Zepler)
Keywords: under-promotion key (S), Employment steering, Opferminimal
Computer test: Gustav 4.1d, Brute Force
FEN: 8/1P1P3p/5K1k/5n1p/7p/8/4p3/5N2
Input: RJB, 2007-10-26
Last update: James Malcom, 2021-06-25 more...
Computer test: Gustav 4.1d, Brute Force
FEN: 8/1P1P3p/5K1k/5n1p/7p/8/4p3/5N2
Input: RJB, 2007-10-26
Last update: James Malcom, 2021-06-25 more...
22 - P1388252
Hugo Knuppert
Lars Larsen
2230 Deutsche Schachzeitung 1, p. 47, 01/1967
1. Lob
(12+9) C+
#2
Hugo Knuppert
Lars Larsen
2230 Deutsche Schachzeitung 1, p. 47, 01/1967
1. Lob
(12+9) C+
#2
1. f8=S! Te5 2. Dc4#
1. ... Te4 2. Td3#
1. ... Te3 2. fxe3#
1. ... Te4 2. Td3#
1. ... Te3 2. fxe3#
Keywords: Black correction, under-promotion key (S), Blocknutzung, Line closing, pin-mate, Pawn mate
Genre: 2#
Computer test: SCHRECKE: C+, popeye 4.85 (2021-04-08)
FEN: 1K4nB/2Q1NP1b/1p2rr2/6p1/1P1k1bR1/1P5R/2P1nP2/7B
Input: Dieter Berlin, 2021-04-08
Last update: Dieter Berlin, 2023-03-12 more...
Genre: 2#
Computer test: SCHRECKE: C+, popeye 4.85 (2021-04-08)
FEN: 1K4nB/2Q1NP1b/1p2rr2/6p1/1P1k1bR1/1P5R/2P1nP2/7B
Input: Dieter Berlin, 2021-04-08
Last update: Dieter Berlin, 2023-03-12 more...
23 - P1388375
Horacio L. Musante
1643 V Deutsche Schachzeitung 11, p. 392, 11/1962
1. Preis
(9+9) C+
#2
Horacio L. Musante
1643 V Deutsche Schachzeitung 11, p. 392, 11/1962
1. Preis
(9+9) C+
#2
1. c8=D? Ld6 2. Dxa8#
1. ... Dxd3 2. Dd7#
1. ... Db8!
1. c8=S! Ld6 2. Sb6#
1. ... Dxd3 2. Se7#
Verbesserung: zusätzlich wTc2
1. ... Dxd3 2. Dd7#
1. ... Db8!
1. c8=S! Ld6 2. Sb6#
1. ... Dxd3 2. Se7#
Verbesserung: zusätzlich wTc2
Keywords: Changed mates (Halbfesselung), under-promotion key (S)
Genre: 2#
Computer test: SCHRECKE: C+, popeye 4.85 (2021-04-10)
FEN: b4N2/2P3n1/P7/Rqbk4/1r1p1Q2/1n1N4/2RpP2K/8
Input: Dieter Berlin, 2021-04-10
Last update: Alfred Pfeiffer, 2021-04-20 more...
Genre: 2#
Computer test: SCHRECKE: C+, popeye 4.85 (2021-04-10)
FEN: b4N2/2P3n1/P7/Rqbk4/1r1p1Q2/1n1N4/2RpP2K/8
Input: Dieter Berlin, 2021-04-10
Last update: Alfred Pfeiffer, 2021-04-20 more...
1. Dc8? Kxh6! 1. Dc7? Kg5! 1. g8=D+? Kf6! 1. g8=T+? Kf7!
1. g8=S! ... 2. Dc8
1. g8=S! ... 2. Dc8
Keywords: under-promotion key (wS), Minimal
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 8/1p4P1/1K4kP/8/4P3/7P/2Q2P2/8
Reprints: 12 Die Schwalbe 88, p. 318, 08/1984
Input: Dieter Berlin, 2022-01-16
Last update: Dieter Berlin, 2023-05-21 more...
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 8/1p4P1/1K4kP/8/4P3/7P/2Q2P2/8
Reprints: 12 Die Schwalbe 88, p. 318, 08/1984
Input: Dieter Berlin, 2022-01-16
Last update: Dieter Berlin, 2023-05-21 more...
1. f8=S! droht 2. Sd7 ... 3. Th4#
sowie 2. Se6+ Ke5,Ke4 3. Te1#
1. ... c3 2. Se6+ Ke5,Ke4 3. Te1#
2. ... Kc4 3. Sd6#
1. ... Ke5 2. Th4 c3 3. d4#
1. ... Kc5 2. Sd7+ Kd4 3. Th4#
2. ... Kb5 3. Sc7#
1. ... Ke4 2. Se6 ... 3. Te1#
1. ... h4 2. Se6+ Ke5,Ke4 3. Te1#
sowie 2. Se6+ Ke5,Ke4 3. Te1#
1. ... c3 2. Se6+ Ke5,Ke4 3. Te1#
2. ... Kc4 3. Sd6#
1. ... Ke5 2. Th4 c3 3. d4#
1. ... Kc5 2. Sd7+ Kd4 3. Th4#
2. ... Kb5 3. Sc7#
1. ... Ke4 2. Se6 ... 3. Te1#
1. ... h4 2. Se6+ Ke5,Ke4 3. Te1#
Keywords: under-promotion key (S), under-promotion (S)
Genre: 3#
FEN: 4N3/4NP2/8/p6p/p1pk4/P7/2PP1K2/7R
Reprints: 32 Der Bund (Bern) 04/10/1914
Input: Mario Richter, 2022-08-06
Last update: Gunter Jordan, 2022-08-06 more...
Genre: 3#
FEN: 4N3/4NP2/8/p6p/p1pk4/P7/2PP1K2/7R
Reprints: 32 Der Bund (Bern) 04/10/1914
Input: Mario Richter, 2022-08-06
Last update: Gunter Jordan, 2022-08-06 more...
1. d8=S! ... 2. e8=S#
Keywords: konsekutive Umwandlungen 2 (SS), under-promotion key (S), Minimal (b), Miniature, under-promotion in mating move (S)
Computer test: Juel: Popeye 4.61
FEN: 8/3PP3/1NNk4/1K6/5n2/8/8/8
Input: Rainer Staudte, 2023-03-20
Last update: Dieter Berlin, 2023-10-29 more...
Computer test: Juel: Popeye 4.61
FEN: 8/3PP3/1NNk4/1K6/5n2/8/8/8
Input: Rainer Staudte, 2023-03-20
Last update: Dieter Berlin, 2023-10-29 more...
1. c8=L! Kb5 2. Db3 Kxc6 3. b5#
Keywords: under-promotion key (L), ambush, Pawn mate, Stalemate avoidance
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 8/2P5/2PP4/P7/kP6/B4Q2/8/7K
Reprints: Im Wunderland des Schachproblems , p. 7, 1958
Input: Dieter Berlin, 2023-12-21
Last update: Dieter Berlin, 2023-12-21 more...
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 8/2P5/2PP4/P7/kP6/B4Q2/8/7K
Reprints: Im Wunderland des Schachproblems , p. 7, 1958
Input: Dieter Berlin, 2023-12-21
Last update: Dieter Berlin, 2023-12-21 more...
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