27 problem(s) found in 4125 milliseconds (displaying 27 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND S='The Problemist' AND K='Unterverwandlung'] [download as LaTeX]
1. La7 Kxa7 2. c8=T Ka6 3. Ta8#
Keywords: under-promotion (T), Stalemate avoidance, Promotion in the retro play (L)
Genre: 3#, Retro
Computer test: Popeye 4.61
FEN: kB6/2P5/2K5/8/8/8/8/8
Reprints: 64 Chess Lyrics , p. 100, 1905
1359 Wiener Hausfrauen-Zeitung 5, p. 77, 29/01/1905
5 Vliegend Blaadje 22/07/1911
Szachy 01/1958
The Problemist (20) 03/1969
406 Mattaufgaben mit drei und vier Steinen 1976
diagrammes 64 01-02/1984
(1) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-02-26 more...
Genre: 3#, Retro
Computer test: Popeye 4.61
FEN: kB6/2P5/2K5/8/8/8/8/8
Reprints: 64 Chess Lyrics , p. 100, 1905
1359 Wiener Hausfrauen-Zeitung 5, p. 77, 29/01/1905
5 Vliegend Blaadje 22/07/1911
Szachy 01/1958
The Problemist (20) 03/1969
406 Mattaufgaben mit drei und vier Steinen 1976
diagrammes 64 01-02/1984
(1) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-02-26 more...
1. Kb2 2. Kc3 3. Kd4 4. Kxe5 5. Kf6 6. e5 7. e4 8. e3 9. e2 10. e1=L 11. Lxh4 12. Lg5 13. Lxh6 14. Kg7 15. Kh8 16. Lg7 17. h5 18. h4 19. h3 20. h2 21. h1=L 22. Lxd5 23. Lg8 24. d5 25. d4 26. d3 27. d2 28. d1=T 29. Th1 30. Th7 Sg6#
Erich Bartel: im Problemist ist hierzu vermerkt:
Jonathan's Artikel has already apeared, in translation,in the
March 1995 issue of Rochade-Europa, and these originals
should compete in the informal tourney of that magazine.
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Die Frage ist nun welches Magazin als Erstqueelle gelten soll. (2011-11-28)
Anton Baumann: NL: 1.d6 2.dxe5 .. 6.e1=D .. 8.Dg8 .. 13.e1=L 14.Lxh4 15.Lg5 16.Lxh6 .. 23.Kh8 24.Lg7 .. 29.h1=T 30.Th7 Sg6# (2020-11-21)
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comment
Jonathan's Artikel has already apeared, in translation,in the
March 1995 issue of Rochade-Europa, and these originals
should compete in the informal tourney of that magazine.
--------
Die Frage ist nun welches Magazin als Erstqueelle gelten soll. (2011-11-28)
Anton Baumann: NL: 1.d6 2.dxe5 .. 6.e1=D .. 8.Dg8 .. 13.e1=L 14.Lxh4 15.Lg5 16.Lxh6 .. 23.Kh8 24.Lg7 .. 29.h1=T 30.Th7 Sg6# (2020-11-21)
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Keywords: Seriesmover, corner to corner (sKa1h8), Excelsior (3-fach), under-promotion, konsekutive Umwandlungen 3 (llt)
Genre: Fairies
FEN: 8/3pp2p/7P/1K1PP3/5N1P/8/8/k7
Reprints: Rochade Europa 03/1995
Input: Felber, Volker, 2000-01-06
Last update: Olaf Jenkner, 2020-11-23 more...
Genre: Fairies
FEN: 8/3pp2p/7P/1K1PP3/5N1P/8/8/k7
Reprints: Rochade Europa 03/1995
Input: Felber, Volker, 2000-01-06
Last update: Olaf Jenkner, 2020-11-23 more...
1) 1. gxh4 a8=L 2. h3 Lxg2 3. Dxg2 f8=D 4. Dg7 Dh8 5. Dxb2 Dxb2#
2) 1. gxf4 f8=D 2. f3 Db4 3. f2 Dxb3 4. Kxb3 a8=L 5. Ka2 Ld5#
2) 1. gxf4 f8=D 2. f3 Db4 3. f2 Dxb3 4. Kxb3 a8=L 5. Ka2 Ld5#
Anton Baumann: C+ Gustav 4.1d (2020-06-09)
Teppo Mänttä: reprint: Tehtäväniekka n:o 3, page 142, 14/09/2016. Published in Kari Valtonen's article about Hungarian themes and composers. (2021-04-28)
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Teppo Mänttä: reprint: Tehtäväniekka n:o 3, page 142, 14/09/2016. Published in Kari Valtonen's article about Hungarian themes and composers. (2021-04-28)
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Keywords: Capture key, Promotion (D), under-promotion (L), konsekutive Umwandlungen 2 (LD, DL), Square vacation, Opferbahnung (in 1), Model mate (in 2)
Genre: h#
FEN: 8/P4P2/4P3/1P4p1/5P1P/1p1p4/kPp3pp/rnK2nrq
Reprints: 5) idee & form 154, p. 5223, 04/2022
Input: hpr, 2002-03-02
Last update: Gunter Jordan, 2023-01-23 more...
Genre: h#
FEN: 8/P4P2/4P3/1P4p1/5P1P/1p1p4/kPp3pp/rnK2nrq
Reprints: 5) idee & form 154, p. 5223, 04/2022
Input: hpr, 2002-03-02
Last update: Gunter Jordan, 2023-01-23 more...
1. b8=S! Txd6+ 2. Kc7 Tc6+ Sxc6# 2. ... Td7+ 3. Sxd7#
1. ... Te7 2. dxe7 Kd6 3. Dd4#
1. ... Te8+ 2. Kxe8 Kxd6 3. De7#
1. ... Tg6 2. De4+ Kxd6 3. De7# 2. ... Kf6 3. De7#
1. ... Th6 2. Sd7+ Kxd6 3. Dxh6#
1. ... Te7 2. dxe7 Kd6 3. Dd4#
1. ... Te8+ 2. Kxe8 Kxd6 3. De7#
1. ... Tg6 2. De4+ Kxd6 3. De7# 2. ... Kf6 3. De7#
1. ... Th6 2. Sd7+ Kxd6 3. Dxh6#
Keywords: Brian Stephenson Collection (29185), Minimal (b), Remote selfblock, under-promotion key (S), Provoked check, Zugzwang-Goal
Genre: 3#
FEN: 3K4/1P4N1/3Pr3/4k3/7Q/2N5/8/8
Reprints: 146 Spectacular Chess Problems , p. 59, 1965
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-15 more...
Genre: 3#
FEN: 3K4/1P4N1/3Pr3/4k3/7Q/2N5/8/8
Reprints: 146 Spectacular Chess Problems , p. 59, 1965
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2023-12-15 more...
1. Sf2 droht 2. Te4+ Kf5 3. Tc3 Sf6#
1. ... Kf6 2. Tf4+ Ke7 3. gxf8=S Sxf4#
1. ... Lc4,Lf1 2. Sxg4+ Kf5 3. Se5 Sf6#
1. ... Ld3 2. Tdxd5+ Kf4 3. gxf8=L Lg6#
1. ... Kf6 2. Tf4+ Ke7 3. gxf8=S Sxf4#
1. ... Lc4,Lf1 2. Sxg4+ Kf5 3. Se5 Sf6#
1. ... Ld3 2. Tdxd5+ Kf4 3. gxf8=L Lg6#
Keywords: Brian Stephenson Collection (45800), under-promotion (L,S), Fesselungsspiel (112 000 101)
Genre: 3#
FEN: 5br1/6P1/3pp2P/1pRnk2K/3RN1pP/1p4p1/2p1b3/BB1Q2n1
Input: Brian Stephenson, 2004-08-12
Last update: Rainer Staudte, 2022-11-07 more...
Genre: 3#
FEN: 5br1/6P1/3pp2P/1pRnk2K/3RN1pP/1p4p1/2p1b3/BB1Q2n1
Input: Brian Stephenson, 2004-08-12
Last update: Rainer Staudte, 2022-11-07 more...
1. e8=T Kf1
1. ... Ke2 2. Lg2 Ke1 3. Txe3#
1. ... e2 2. Th8 Kf1 3. Th1#
1. ... Kf1 2. Txe3 Kg1 3. Te1#
1. ... Ke2 2. Lg2 Ke1 3. Txe3#
1. ... e2 2. Th8 Kf1 3. Th1#
1. ... Kf1 2. Txe3 Kg1 3. Te1#
Keywords: Miniature Collection (0325079), Minimal, Miniature, under-promotion key
Genre: 3#
FEN: 8/1B2P3/8/8/6N1/4p3/2K5/4k3
Reprints: Schach-Echo 4, p. 102, 02/1993
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2021-08-14 more...
Genre: 3#
FEN: 8/1B2P3/8/8/6N1/4p3/2K5/4k3
Reprints: Schach-Echo 4, p. 102, 02/1993
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2021-08-14 more...
1. d7! droht 2. dxe8=D#,dxe8=L#,d8=S#
1. ... Kc7 2. dxe8=D#
1. ... Lxd7 2. Dc5#
1. ... Lh5,Lg6,Lf7 2. d8=S#
1. ... Sb6,Sc7 d8=S#
1. ... Kc7 2. dxe8=D#
1. ... Lxd7 2. Dc5#
1. ... Lh5,Lg6,Lf7 2. d8=S#
1. ... Sb6,Sc7 d8=S#
Keywords: Miniature Collection (0016215), under-promotion in mating move (S), discovered checkmate, Promotion (D), Miniature
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: n3b3/4Q3/2kP4/8/3K4/1R6/8/8
Reprints: The Problemist 1953
13 Schachminiaturen Zweizüger , p. 14, 1965
24 Elementary Electronics 05-06/1970
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-01-12 more...
Genre: 2#
Computer test: Juel: Popeye 4.61
FEN: n3b3/4Q3/2kP4/8/3K4/1R6/8/8
Reprints: The Problemist 1953
13 Schachminiaturen Zweizüger , p. 14, 1965
24 Elementary Electronics 05-06/1970
Input: Felber, Volker, 2010-09-11
Last update: Dieter Berlin, 2023-01-12 more...
1. Db7! bxc1=L 2. g8=S+ Kxh8 3. Se7+ Kh7 4. Sd5+ Kg6 5. Sf4+ Lxf4#
1. ... bxc1=S 2. g8=L+ Kxh8 3. Lf7+ Kh7 4. Lc4+ Kg6 5. Ld3+ Sxd3#
1. ... c5 2. g6+ Kxh6 3. Sf7+ Kxg6 4. g8=D+ Kf5 5. Tf1+ Txf1#
1. ... bxc1=S 2. g8=L+ Kxh8 3. Lf7+ Kh7 4. Lc4+ Kg6 5. Ld3+ Sxd3#
1. ... c5 2. g6+ Kxh6 3. Sf7+ Kxg6 4. g8=D+ Kf5 5. Tf1+ Txf1#
Keywords: Batterie Typ Siers, Battery play, Exchange of Promotions, under-promotion B/S
Genre: s#
FEN: 4R2N/5QPk/2p2P1N/4P1Pp/7P/1p4p1/1p4P1/brR4K
Input: Frank Müller, 2011-05-07
Last update: Marcin Banaszek, 2021-07-29 more...
Genre: s#
FEN: 4R2N/5QPk/2p2P1N/4P1Pp/7P/1p4p1/1p4P1/brR4K
Input: Frank Müller, 2011-05-07
Last update: Marcin Banaszek, 2021-07-29 more...
1. Sc5? g1=T!
1. Te4? g1=S!
1. Sf4! g1=S 2. Scd3+ Ke3! 3. Dd2+ Kf3 4. Se5+ Kf2 5. Dd4+ Ke1 6. Sf3+ Sxf3#
1. ... g1=T 2. Sg2 Lxg2 3. Txe2+ Kf1 4. Te1+ Kf2 5. Dd2+ Kf3 6. Dxg2+ Txg2#
1. Te4? g1=S!
1. Sf4! g1=S 2. Scd3+ Ke3! 3. Dd2+ Kf3 4. Se5+ Kf2 5. Dd4+ Ke1 6. Sf3+ Sxf3#
1. ... g1=T 2. Sg2 Lxg2 3. Txe2+ Kf1 4. Te1+ Kf2 5. Dd2+ Kf3 6. Dxg2+ Txg2#
Keywords: under-promotion (t,s)
Genre: s#
Computer test: Popeye Windows-64Bit v4.55 (4594 MB)
FEN: 8/8/4N3/8/6RB/2Q3nP/R3nkpK/2N2b2
Input: Frank Müller, 2014-11-30
Last update: Marcin Banaszek, 2020-12-10 more...
Genre: s#
Computer test: Popeye Windows-64Bit v4.55 (4594 MB)
FEN: 8/8/4N3/8/6RB/2Q3nP/R3nkpK/2N2b2
Input: Frank Müller, 2014-11-30
Last update: Marcin Banaszek, 2020-12-10 more...
1. d8=D+ Kg4 2. h8=L e1=S 3. Df5+ Kxf5 4. Df6+ Kg4 5. Lh3+ Kh5 6. Tg5+ Kh4 7. Tg2+ Kh5 8. Dg6+ Kh4 9. Sf3+ Sxf3#
2. ... e1=T 3. Dg6+ Kf4 4. Dh4+ Ke3 5. De6+ Kd3 6. Dh7+ Te4 7. Db3+ Ke2 8. Lf3+ Kf2 9. Dh4+ Txh4#
Cook: NL
2. ... e1=T 3. Dg6+ Kf4 4. Dh4+ Ke3 5. De6+ Kd3 6. Dh7+ Te4 7. Db3+ Ke2 8. Lf3+ Kf2 9. Dh4+ Txh4#
Cook: NL
Anton Baumann: NL: 1.Lh3! e1T! 2.d8=D+ Te7 3.Lg4 Kg5 4.Tg3 Kh4(Kh6) 5.Dff8(Ddf8+) Kg5 6.Lf3+ Kh4 7.Kg1+ Kxg3 8.Se4+ Txe4 9.Le1+ Txe1#
Mögliche Korrektur: +wBg4 verhindert die NL (C+ Gustav 4.1d) (2021-11-01)
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Mögliche Korrektur: +wBg4 verhindert die NL (C+ Gustav 4.1d) (2021-11-01)
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Keywords: under-promotion (t,s), Minimal
Genre: s#
FEN: 8/3P1Q1P/8/8/1B5k/8/3Np1BK/6RR
Input: Frank Müller, 2015-04-06
Last update: Marcin Banaszek, 2021-11-01 more...
Genre: s#
FEN: 8/3P1Q1P/8/8/1B5k/8/3Np1BK/6RR
Input: Frank Müller, 2015-04-06
Last update: Marcin Banaszek, 2021-11-01 more...
1. b8=D+! Kd7 2. e8=T c5 3. Dd8+ Kc6 4. a8=D+ Kb5 5. Ddb8+ Kc4 6. Te1 Kd4 7. h8=L+ Kc4 8. Kd1 Kd3 9. Df4 c4 10. Lb2 c3 11. Lc1 c2#
Keywords: Kindergarten Problem, konsekutive Umwandlungen 4 (DTDL), Pawn mate, under-promotion, Minimal (s), Miniature, Selfblock, Model mate, Checking key, Promotion key, Flight taking
Genre: s#
FEN: 8/PPk1P2P/2p5/8/8/8/2K5/8
Reprints: 14) idee & form 143, p. 4843, 07/2019
Input: Frank Müller, 2015-04-11
Last update: Rainer Staudte, 2023-01-19 more...
Genre: s#
FEN: 8/PPk1P2P/2p5/8/8/8/2K5/8
Reprints: 14) idee & form 143, p. 4843, 07/2019
Input: Frank Müller, 2015-04-11
Last update: Rainer Staudte, 2023-01-19 more...
1. d8=S! g5 2. b5 g4 3. b7 Ka7 4. b8=T g3 5. Se6 fxe6 6. f7 e5 7. d5 e4 8. f8=D e3 9. Df2 exf2,gxf2#
Version zu P1343954
Gunter Jordan: Lt. Hans Gruber erschien diese Aufgabe in feenschach 227 (2017), tatsächlich erschienen im März 2018. Somit ist feenschach die Erstquelle (sofern die Aufgabe nicht noch irgendwo drittveröffentlicht wurde). Ich habe hier die Erstquelle auf feenschach geändert. Die ursprüngliche 'Erstquelle' The Problemist habe ich als Reprint eingegeben. [GJ] (2020-10-30)
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Gunter Jordan: Lt. Hans Gruber erschien diese Aufgabe in feenschach 227 (2017), tatsächlich erschienen im März 2018. Somit ist feenschach die Erstquelle (sofern die Aufgabe nicht noch irgendwo drittveröffentlicht wurde). Ich habe hier die Erstquelle auf feenschach geändert. Die ursprüngliche 'Erstquelle' The Problemist habe ich als Reprint eingegeben. [GJ] (2020-10-30)
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Keywords: Kindergarten Problem, under-promotion (S,T), Promotion (D), under-promotion key (S), Multiple publication, Pawn mate, Antiphönix, Pinning, Flight taking
Genre: s#
Computer test: Gustav 4.0c
FEN: k7/2PP1p2/1P3Pp1/8/1P1P4/3p4/3Pp1P1/4K3
Reprints: S2678c The Problemist 26-9, p. 363, 05/2018
Input: Felber, Volker, 2018-12-11
Last update: Gunter Jordan, 2020-10-30 more...
Genre: s#
Computer test: Gustav 4.0c
FEN: k7/2PP1p2/1P3Pp1/8/1P1P4/3p4/3Pp1P1/4K3
Reprints: S2678c The Problemist 26-9, p. 363, 05/2018
Input: Felber, Volker, 2018-12-11
Last update: Gunter Jordan, 2020-10-30 more...
1. g4 b5 2. g5 b4 3. g6 b3 4. gxh7 bxa2 5. hxg8=S axb1=S 6. Sxe7 Sc3 7. Sd5 Sxe2 8. Sc3 Sxc1 9. Txc1 Sc6 10. Sb1
Scheint ein Selbstplagiat zu sein. Das Stück wurde in Problemas (SEPA), 07/2020, Heft 31, H1, Seite 935 als Original veröffentlicht.
Scheint ein Selbstplagiat zu sein. Das Stück wurde in Problemas (SEPA), 07/2020, Heft 31, H1, Seite 935 als Original veröffentlicht.
Henrik Juel: C+ Euclide 1.01
This is an example of the retro theme of WCCT-11
The thematic square is b1, where Sb1 is not original, but promoted, and where Black promoted, only to have his promoted piece captured later
The fact that the promotions are both to knight is not required by the theme (2021-03-21)
Henrik Juel: The PDB definition of Antiphönix recommends that this keyword should be deleted... (2021-03-21)
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This is an example of the retro theme of WCCT-11
The thematic square is b1, where Sb1 is not original, but promoted, and where Black promoted, only to have his promoted piece captured later
The fact that the promotions are both to knight is not required by the theme (2021-03-21)
Henrik Juel: The PDB definition of Antiphönix recommends that this keyword should be deleted... (2021-03-21)
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Keywords: blocking of a piece, Excelsior black, Excelsior white, Phoenix, Prentos Theme (s), Pronkin Theme (S), Promotions to Knights, under-promotion (ss)
Genre: Retro
FEN: r1bqkb1r/p1pp1pp1/2n5/8/8/8/1PPP1P1P/1NRQKBNR
Reprints: H Springaren 154, p. 49, 06/2020
H The Problemist , p. 383, 07/2020
Input: Gunter Jordan, 2021-03-21
Last update: Gunter Jordan, 2023-04-03 more...
Genre: Retro
FEN: r1bqkb1r/p1pp1pp1/2n5/8/8/8/1PPP1P1P/1NRQKBNR
Reprints: H Springaren 154, p. 49, 06/2020
H The Problemist , p. 383, 07/2020
Input: Gunter Jordan, 2021-03-21
Last update: Gunter Jordan, 2023-04-03 more...
1. b4 f5 2. b5 f4 3. b6 f3 4. bxc7 fxg2 5. cxb8=S gxh1=D 6. Sxd7 Dd5 7. Sxf8 Dxd2+ 8. Lxd2 Dxd2+ 9. Sxd2 Kd8 10. Sxh7 Txh7 11. Tc1 Th8 12. Sb1+
Moldenhauer: Computerprüfung: C+ Natch 3.3 in 5 Tage 10 Std. 49 Min. eine Lösung gefunden.
Prüfung BP in 11 u. 12, keine Lösung! (2022-08-30)
A.Buchanan: Since the position is check, the only shorter PG which requires examination is 10.5 (2022-08-30)
Moldenhauer: Computerüberprüfung: BP in 10.5 Natch 3.3 keine Lösung! Zeit 16 Std. 22 Min. (2022-09-01)
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Prüfung BP in 11 u. 12, keine Lösung! (2022-08-30)
A.Buchanan: Since the position is check, the only shorter PG which requires examination is 10.5 (2022-08-30)
Moldenhauer: Computerüberprüfung: BP in 10.5 Natch 3.3 keine Lösung! Zeit 16 Std. 22 Min. (2022-09-01)
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Keywords: Discovered check, Unique Proof Game, Excelsior black, Excelsior white, Prentos Theme (Sd), Switchback (St), Promotion (d), under-promotion (S), x pieces capture on one square (4)
Genre: Retro
Computer test: Computerprüfung: C+ Natch 3.3 in 5 Tage 10 Std. 49 Min. eine Lösung gefunden. Prüfung BP in 11 u. 12, keine Lösung!
FEN: r1bk2nr/pp2p1p1/8/8/8/8/P1P1PP1P/1NRQKBN1
Input: Gunter Jordan, 2021-04-18
Last update: A.Buchanan, 2022-08-30 more...
Genre: Retro
Computer test: Computerprüfung: C+ Natch 3.3 in 5 Tage 10 Std. 49 Min. eine Lösung gefunden. Prüfung BP in 11 u. 12, keine Lösung!
FEN: r1bk2nr/pp2p1p1/8/8/8/8/P1P1PP1P/1NRQKBN1
Input: Gunter Jordan, 2021-04-18
Last update: A.Buchanan, 2022-08-30 more...
1. e4 d5 2. exd5 Sc6 3. dxc6 Ld7 4. cxb7 Lb5 5. b8=S Dd7 6. Sxd7 0-0-0 7. Sxf8 Txd2 8. Sxh7 Txh7 9. g4 Th5 10. Lh3 Te2 11. Kf1 Tc5 12. g5+ f5 13. gxf6ep+
Keywords: Unique Proof Game, Valladao Task, Castling, En passant, under-promotion (S), Ceriani-Frolkin Theme (S), Prentos Theme (S)
Genre: Retro
Computer test: C+ Euclide 1.01, no solution in 11.5
FEN: 2k3n1/p1p1p1p1/5P2/1br5/8/7B/PPP1rP1P/RNBQ1KNR
Reprints: 9 Orbit 30, p. 317, 04/2006
Input: A.Buchanan, 2021-07-03
Last update: Alfred Pfeiffer, 2021-11-26 more...
Genre: Retro
Computer test: C+ Euclide 1.01, no solution in 11.5
FEN: 2k3n1/p1p1p1p1/5P2/1br5/8/7B/PPP1rP1P/RNBQ1KNR
Reprints: 9 Orbit 30, p. 317, 04/2006
Input: A.Buchanan, 2021-07-03
Last update: Alfred Pfeiffer, 2021-11-26 more...
16 - P1391301
Brian E. Chamberlain
R450 The Problemist 09/2012
dedicated to J.Ling
(12+14) C+
BP in 16.0
Brian E. Chamberlain
R450 The Problemist 09/2012
dedicated to J.Ling
(12+14) C+
BP in 16.0
1. Sb1-c3 Sg8-f6 2. Sc3-d5 Sf6-e4 3. Sd5xe7 Se4xd2 4. Ke1xd2 a7-a5 5. Kd2-c3 a5-a4 6. Kc3-b4 Sb8-a6 7. Kb4-a5 Lf8xe7 8. e2-e4 0-0 9. Dd1-h5 f7-f5 10. Lf1-e2 f5-f4 11. Le2-g4 f4-f3 12. Sg1-e2 f3xe2 13. Th1-d1 Tf8-f3 14. Td1-d5 Tf3-a3 15. Td5-b5 e2-e1=L+ 16. b2-b4 a4xb3ep#
Keywords: Unique Proof Game, Valladao Task, Castling, En passant, under-promotion (l), Non-standard material (l)
Genre: Retro
Computer test: Euclide 1.01, no solution in 15.0
FEN: r1bq2k1/1pppb1pp/n7/KR5Q/4P1B1/rp6/P1P2PPP/R1B1b3
Input: A.Buchanan, 2021-07-03
Last update: Alfred Pfeiffer, 2021-11-26 more...
Genre: Retro
Computer test: Euclide 1.01, no solution in 15.0
FEN: r1bq2k1/1pppb1pp/n7/KR5Q/4P1B1/rp6/P1P2PPP/R1B1b3
Input: A.Buchanan, 2021-07-03
Last update: Alfred Pfeiffer, 2021-11-26 more...
1. Da6! droht 2. Txh5#,Tg5#,Tf5#,Te5#,Td5#,Tc5#,Txb2#,Ta3#,Th3#,Tg3#,Tf3#,Te3#,Td3#,Tc3#
1. ... b1=D+ 2. Txb1#
1. ... b1=L+ 2. Txb1#
1. ... Sg3+ 2. Txg3#
1. ... Sec3+ 2. Txc3#
1. ... Tg1+ 2. Tf3#
1. ... Tf2+ 2. Tf3#
1. ... Tgg8+ 2. Tf3#
1. ... Tg7+ 2. Tf3#
1. ... Tg6+ 2. Tf3#
1. ... Tg5+ 2. Tf3#
1. ... Tg4+ 2. Tf3#
1. ... Tg3+ 2. Tf3#
1. ... Th2+ 2. Tf3#
1. ... Sac3+ 2. Txc3#
1. ... Sc5+ 2. Txc5#
1. ... Df3+ 2. Txf3#
1. ... Dg6+ 2. Tf5#
1. ... Dd5+ 2. Txd5#
1. ... De5+ 2. Txe5#
1. ... Df5+ 2. Txf5#
1. ... Dh7+ 2. Tf5#
1. ... d5+ 2. Txd5#
1. ... Lh4+ 2. Te5#
1. ... Lg5+ 2. Te5#
1. ... Lf6+ 2. Te5#
1. ... Lf8+ 2. Te5#
1. ... Ld8+ 2. Te5#
1. ... f5+ 2. Txf5#
1. ... b1=D+ 2. Txb1#
1. ... b1=L+ 2. Txb1#
1. ... Sg3+ 2. Txg3#
1. ... Sec3+ 2. Txc3#
1. ... Tg1+ 2. Tf3#
1. ... Tf2+ 2. Tf3#
1. ... Tgg8+ 2. Tf3#
1. ... Tg7+ 2. Tf3#
1. ... Tg6+ 2. Tf3#
1. ... Tg5+ 2. Tf3#
1. ... Tg4+ 2. Tf3#
1. ... Tg3+ 2. Tf3#
1. ... Th2+ 2. Tf3#
1. ... Sac3+ 2. Txc3#
1. ... Sc5+ 2. Txc5#
1. ... Df3+ 2. Txf3#
1. ... Dg6+ 2. Tf5#
1. ... Dd5+ 2. Txd5#
1. ... De5+ 2. Txe5#
1. ... Df5+ 2. Txf5#
1. ... Dh7+ 2. Tf5#
1. ... d5+ 2. Txd5#
1. ... Lh4+ 2. Te5#
1. ... Lg5+ 2. Te5#
1. ... Lf6+ 2. Te5#
1. ... Lf8+ 2. Te5#
1. ... Ld8+ 2. Te5#
1. ... f5+ 2. Txf5#
'The Problemist' zählt 27 schwarze Schachs (also vermutlich 1. ... b1=D+ und 1. ... b1=L+ nur als ein Schach)
Überboten durch P1054330.
'The Problemist' gibt zur Quelle nur das Urdruckjahr 1922 an, von der Zeit her könnte die Quelle 'Good Companions' sein ...
Henrik Juel: duals after other defenses (2021-07-29)
comment
Überboten durch P1054330.
'The Problemist' gibt zur Quelle nur das Urdruckjahr 1922 an, von der Zeit her könnte die Quelle 'Good Companions' sein ...
Henrik Juel: duals after other defenses (2021-07-29)
comment
Keywords: Promotion (d), under-promotion (l)
Genre: 2#
FEN: 4r3/Q3bp2/3p4/PR5q/nBk1Kp2/1R6/Bp2n1r1/7b
Reprints: The Problemist 15, p. 416, 05/1950
Input: Mario Richter, 2021-07-29
Last update: Alfred Pfeiffer, 2022-03-23 more...
Genre: 2#
FEN: 4r3/Q3bp2/3p4/PR5q/nBk1Kp2/1R6/Bp2n1r1/7b
Reprints: The Problemist 15, p. 416, 05/1950
Input: Mario Richter, 2021-07-29
Last update: Alfred Pfeiffer, 2022-03-23 more...
1. e3 h6 2. Ke2 h5 3. Kf3 h4 4. Kg4 Sh6+ 5. Kh5 h3 6. Dg4 hxg2 7. Sf3 g1=S 8. h4 Sh3 9. d3 Sg5 10. hxg5 Sg8#
SCHRECKE: C+, Jacobi v0.7.5 (2022-01-27)
Henrik Juel: Euclide 1.01 is probably faster than Jacobi here (1 second)
But testing time is not really an issue in such a short problem (2022-01-27)
comment
Henrik Juel: Euclide 1.01 is probably faster than Jacobi here (1 second)
But testing time is not really an issue in such a short problem (2022-01-27)
comment
Keywords: discovered checkmate, Battery creation, Batteriematt vertikal, Ceriani-Frolkin Theme, Unique Proof Game, Excelsior black, Homebase (s), Switchback (s), under-promotion (s)
Genre: Retro
FEN: rnbqkbnr/ppppppp1/8/6PK/6Q1/3PPN2/PPP2P2/RNB2B1R
Input: Gunter Jordan, 2022-01-27
Last update: Gunter Jordan, 2022-01-27 more...
Genre: Retro
FEN: rnbqkbnr/ppppppp1/8/6PK/6Q1/3PPN2/PPP2P2/RNB2B1R
Input: Gunter Jordan, 2022-01-27
Last update: Gunter Jordan, 2022-01-27 more...
19 - P1401153
Zlatko Mihajloski
Fadil Abdurahmanovic
H4469 The Problemist 28-4, p. 153, 07/2021
(2+14)
h#6
Zlatko Mihajloski
Fadil Abdurahmanovic
H4469 The Problemist 28-4, p. 153, 07/2021
(2+14)
h#6
1. Da7 Tf1 2. e1=T Kh1 3. Tb1 Tc1 4. Tb7 Tc6 5. Tf7 Th6 6. De7 Th8#
Henrik Juel: C+ Popeye 4.61 (2022-05-06)
Henrik Juel: nice problem with several clearances (2022-05-06)
comment
Henrik Juel: nice problem with several clearances (2022-05-06)
comment
Keywords: Minimal (T), under-promotion (t), Pelle move, bi-coloured Bristol, black Bristol, Turton (d-t), Selfblock
Genre: h#
FEN: 4bk2/5qn1/8/p3pp2/3p2np/5pbp/4p3/R5K1
Input: Felber, Volker, 2022-05-06
Last update: Gunter Jordan, 2023-02-09 more...
Genre: h#
FEN: 4bk2/5qn1/8/p3pp2/3p2np/5pbp/4p3/R5K1
Input: Felber, Volker, 2022-05-06
Last update: Gunter Jordan, 2023-02-09 more...
20 - P1401191
Norbert Geissler
Raúl Jordan
2241 Gaudium 250 31/10/2021
1. Preis
Abt. h#2,5-3,5
PR Manfred Rittirsch
(5+13) C+
h#4
0.2.1...
Norbert Geissler
Raúl Jordan
2241 Gaudium 250 31/10/2021
1. Preis
Abt. h#2,5-3,5
PR Manfred Rittirsch
(5+13) C+
h#4
0.2.1...
1) 1. ... Se1+ 2. fxe1=L Kc2 3. Kf2 Kc2-d1 4. Dg2 Lxe1#,
2) 1. ... Le1 2. fxe1=S Kd2 3. Tf2+ Kd2-d1 4. Kf3 Sxe1#
Schlüssel- und Mattzüge auf das gleiche Feld.
2) 1. ... Le1 2. fxe1=S Kd2 3. Tf2+ Kd2-d1 4. Kf3 Sxe1#
Schlüssel- und Mattzüge auf das gleiche Feld.
A.Buchanan: Hi Gunter thanks for your scholarship. The specified syntax for PDB is to separate phases by commas. If something only occurs in 1 phase I guess it would be e.g. "L,". It is not a good idea to have multiple occurrences of the same keyword within a problem, because that makes counting & quality-checking more difficult, and is fiendishly difficult to track. Thanks for your understanding. If you have different opinions, please express them here, in German or English. (2022-08-01)
Yuri Bilokin: more economical c1=a1, then bPc7(-bNc7) 8/2p5/3b4/p1Rpp3/p3n3/K1Prq3/NB1pk3/3br3 h#4 0.2.1…
1...Sc1+ 2.dxc1=B Ka2 3.Kd2 Kb1 4.Qe2 Bxc1# (MM)
1...Bc1 2.dxc1=S Kb2 3.Rd2+ Kb1 4.Kd3 Sxc1# (MM) (2022-08-03)
Mario Richter: Hi Andrew, can you please give an example in what sense "multiple occurrences of the same keyword within a problem" do make "counting & quality-checking more difficult", and what you mean with "is fiendishly difficult to track"! (2022-08-04)
Gunter Jordan: Lieber Yuri, wie mir die Autoren mitteilten, kannten sie die von dir angegebene Stellung (und noch weitere Versionen), doch entschieden sie sich bewusst für ihre Diagrammposition, weil darin Weiß nicht nur drei Anfangszüge hat, wovon sogar zwei lösen, sondern eine größere Auswahl in einer viel freieren Stellung. (2023-01-15)
Gunter Jordan: ... entschuldigung, verzählt. Es sind 4 Anfangszüge bei Yuri. (2023-01-15)
comment
Yuri Bilokin: more economical c1=a1, then bPc7(-bNc7) 8/2p5/3b4/p1Rpp3/p3n3/K1Prq3/NB1pk3/3br3 h#4 0.2.1…
1...Sc1+ 2.dxc1=B Ka2 3.Kd2 Kb1 4.Qe2 Bxc1# (MM)
1...Bc1 2.dxc1=S Kb2 3.Rd2+ Kb1 4.Kd3 Sxc1# (MM) (2022-08-03)
Mario Richter: Hi Andrew, can you please give an example in what sense "multiple occurrences of the same keyword within a problem" do make "counting & quality-checking more difficult", and what you mean with "is fiendishly difficult to track"! (2022-08-04)
Gunter Jordan: Lieber Yuri, wie mir die Autoren mitteilten, kannten sie die von dir angegebene Stellung (und noch weitere Versionen), doch entschieden sie sich bewusst für ihre Diagrammposition, weil darin Weiß nicht nur drei Anfangszüge hat, wovon sogar zwei lösen, sondern eine größere Auswahl in einer viel freieren Stellung. (2023-01-15)
Gunter Jordan: ... entschuldigung, verzählt. Es sind 4 Anfangszüge bei Yuri. (2023-01-15)
comment
Keywords: Exchange of roles (L-S), Koshakin Theme, Model mate, Reciprocal moves by White, Schnoebelen Theme (l,s), under-promotion (l,s), Zilahi, x pieces move to one square, x pieces capture on one square, Square vacation, Checking key (1)
Genre: h#
Computer test: Popeye Windows-64Bit v4.85 (4096 KB)
FEN: 8/4n3/5b2/2p1Rpp1/2p3n1/2K1Prq1/2NB1pk1/5br1
Reprints: E1 The Problemist , p. 164, 07/2023
Input: Gunter Jordan, 2022-05-08
Last update: Gunter Jordan, 2023-11-27 more...
Genre: h#
Computer test: Popeye Windows-64Bit v4.85 (4096 KB)
FEN: 8/4n3/5b2/2p1Rpp1/2p3n1/2K1Prq1/2NB1pk1/5br1
Reprints: E1 The Problemist , p. 164, 07/2023
Input: Gunter Jordan, 2022-05-08
Last update: Gunter Jordan, 2023-11-27 more...
1) 1. Lg8 c4 2. Ld5 cxd5 3. Kg5 dxc6 4. Kf4 c7 5. Ke5 c8=D 6. Kd4 Dc5#
2) 1. e1=T c4 2. Td1 c5 3. Td6 cxd6 4. g2 d7 5. g1=T d8=S 6. Tg6 Sf7#
2) 1. e1=T c4 2. Td1 c5 3. Td6 cxd6 4. g2 d7 5. g1=T d8=S 6. Tg6 Sf7#
Yuri Bilokin: more economicai -wPc3, -bPe3
8/6bb/2p2p1k/5p1p/1K2p3/6p1/2P1p3/8 (2+10) h#6 2.1…
1.Bg8 c4 2.Bd5 cxd5 3.Kg5 dxc6 4.Kf4 c7 5.Ke3 c8=Q 6.Kd3 Qc3#
1.e1=R c4 2.Rd1 c5 3.Rd6 cxd6 4.g2 d7 5.g1=R d8=S 6.Rg6 Sf7# (MM)
Excelsior (white) × 2
Exchange of functions (bPe2/bBh7, Active sacrifice / Passive self-block) (2022-07-18)
comment
8/6bb/2p2p1k/5p1p/1K2p3/6p1/2P1p3/8 (2+10) h#6 2.1…
1.Bg8 c4 2.Bd5 cxd5 3.Kg5 dxc6 4.Kf4 c7 5.Ke3 c8=Q 6.Kd3 Qc3#
1.e1=R c4 2.Rd1 c5 3.Rd6 cxd6 4.g2 d7 5.g1=R d8=S 6.Rg6 Sf7# (MM)
Excelsior (white) × 2
Exchange of functions (bPe2/bBh7, Active sacrifice / Passive self-block) (2022-07-18)
comment
Keywords: under-promotion key (in 2), Promotions to rooks (in 2), konsekutive Umwandlungen 3 (ttS in 2), Promotion (D in 1), Allumwandlung, Selfblock (in 2), Entblockung (in 1)
Genre: h#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 8/6bb/2p2p1k/5p1p/1K2p3/2P1p1p1/2P1p3/8
Input: Felber, Volker, 2022-07-13
Last update: Gunter Jordan, 2023-03-09 more...
Genre: h#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 8/6bb/2p2p1k/5p1p/1K2p3/2P1p1p1/2P1p3/8
Input: Felber, Volker, 2022-07-13
Last update: Gunter Jordan, 2023-03-09 more...
1. c1=S Kb1 2. Sb3 axb3 3. Se4 b4 4. d2 b5 5. d1=S b6 6. Se3 b7 7. S3f5 b8=S 8. Sg5 Sd7#
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Keywords: Entblockung, Excelsior white, konsekutive Umwandlungen 3 (ssS), Liniensperrung, Model mate, Check Protection, Selfblock, Promotions to Knights, under-promotion (Sss), under-promotion key, Minimal (B)
Genre: h#
FEN: 8/4nqb1/4pkb1/8/8/p2p4/P1p2n2/K7
Reprints: 4 The Problemist 283 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
Genre: h#
FEN: 8/4nqb1/4pkb1/8/8/p2p4/P1p2n2/K7
Reprints: 4 The Problemist 283 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
23 - P1407699
Stephen J. G. Taylor
Bulletin 26/06/2021
5. Preis
Jorma Pitkänen-80 JT 2021
(5+5) C+
h#8
Stephen J. G. Taylor
Bulletin 26/06/2021
5. Preis
Jorma Pitkänen-80 JT 2021
(5+5) C+
h#8
1. h3 Sh6 2. Ke7 Kd1 3. Kf6 Sg4+ 4. Kg5 Sf2 5. exf2 Kd2 6. Kh4 Ke3 7. f1=S+ Kf4 8. Sg3 hxg3#
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Keywords: Antiphönix, Pawn mate, Entblockung, Remote selfblock, Model mate, Tempo Loss, under-promotion (s)
Genre: h#
FEN: 3k2N1/8/8/7p/7p/1p2p3/1P2P2P/2K5
Reprints: 5 The Problemist , p. 283, 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
Genre: h#
FEN: 3k2N1/8/8/7p/7p/1p2p3/1P2P2P/2K5
Reprints: 5 The Problemist , p. 283, 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
1. Ke3 Kc1 2. Kd4 Kd1 3. e3 Ke1 4. e2 Kf2 5. e1=S Kg3 6. Sxc2 Kf4 7. Se1 Kxf5 8. Sd3 Sc2#
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Keywords: Entblockung, Model mate, Switchback (s), under-promotion (s)
Genre: h#
FEN: 8/8/8/2p2p2/1pP1p3/1Pp5/2P1k3/NK6
Reprints: 8 The Problemist , p. 306, 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
Genre: h#
FEN: 8/8/8/2p2p2/1pP1p3/1Pp5/2P1k3/NK6
Reprints: 8 The Problemist , p. 306, 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
1. f2 Ka3 2. f1=S Ka4 3. Sg3 hxg3 4. Lf5 g4 5. h2 gxf5 6. h1=D fxe6 7. Dh2 e7 8. Dd6 exd8=S#
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Turnier-Thema: h#8, one solution, with wS(s) + bS(s).
Keywords: Antiphönix, Entblockung, Excelsior white, konsekutive Umwandlungen 3 (sdS), Model mate, Phoenix, Rückkehr nach Umwandlung (b/d), Selfblock, Promotion (d), Promotions to Knights, under-promotion (Ss), under-promotion in mating move, Minimal (B)
Genre: h#
FEN: 3b4/2nn4/1rk1p3/2pp4/6bp/5p1p/K6P/8
Reprints: 9 The Problemist , p. 306, 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
Genre: h#
FEN: 3b4/2nn4/1rk1p3/2pp4/6bp/5p1p/K6P/8
Reprints: 9 The Problemist , p. 306, 01/2022
Input: Gunter Jordan, 2023-02-09
Last update: Gunter Jordan, 2023-02-09 more...
1) 1. ... b8=D+ 2. Kg4+ Df4+ 3. Kh5 Dd2 4. Le3 fxe3 5. Kg4 Dd1 6. Kg3 Dg1#
2) 1. ... b8=T 2. b2+ Txb2 3. d2+ Kxc2 4. d1=S Kd3 5. Se3 Te2 6. Sf5 Te4#
2) 1. ... b8=T 2. b2+ Txb2 3. d2+ Kxc2 4. d1=S Kd3 5. Se3 Te2 6. Sf5 Te4#
Yuri Bilokin: you can see 1.h2 b8=Q+ 2.Kg4+ Qf4+ 3.Kh3 Qe3 4.Bf6 Qxf3#
1.h2 b8=Q+ 2.Kg4+ Qf4+ 3.Kh3 Qe3 4.Be7 Qxf3#
1.h2 b8=Q+ 2.Kg4+ Qf4+ 3.Kh3 Qe3 4.Bd8 Qxf3#
1.Bf6 b8=Q+ 2.Kg4 Qxb3 3.h2 Qd5 4.Kh3 Qxf3# (2024-02-29)
comment
1.h2 b8=Q+ 2.Kg4+ Qf4+ 3.Kh3 Qe3 4.Be7 Qxf3#
1.h2 b8=Q+ 2.Kg4+ Qf4+ 3.Kh3 Qe3 4.Bd8 Qxf3#
1.Bf6 b8=Q+ 2.Kg4 Qxb3 3.h2 Qd5 4.Kh3 Qxf3# (2024-02-29)
comment
Keywords: Checking key (in 1), Promotion key (in 1), under-promotion key (in 2), under-promotion (ts in 2), konsekutive Umwandlungen 2 (ts in 2), bi-coloured Bristol (in 1), Cross check (in 1), Discovered check (in 1), selfpinning (in 1), Unpinning (in 1), Switchback (k in 1), Model mate (in 1), Exchange of Promotions
Genre: h#
FEN: 5n1n/1P6/8/6b1/5k1p/pppp1p1p/2p2P2/2K5
Input: Gunter Jordan, 2023-04-10
Last update: Felber, Volker, 2023-10-15 more...
Genre: h#
FEN: 5n1n/1P6/8/6b1/5k1p/pppp1p1p/2p2P2/2K5
Input: Gunter Jordan, 2023-04-10
Last update: Felber, Volker, 2023-10-15 more...
27 - P1411858
Ljubomir Ugren
PS3894 The Problemist Supplement 182, p. 271, 01/2023
(2+13)
h#6
b) sLa1->a7
Ljubomir Ugren
PS3894 The Problemist Supplement 182, p. 271, 01/2023
(2+13)
h#6
b) sLa1->a7
a) 1. Sb3 Kg1 2. Tb1 Kh1 3. Dc1 Kg1 4. e1=S Lxd3+ 5. Kd1 Kf1 6. Sc2 Le2#
b) 1. Lg1 Lxe2 2. Kc3 Lxg4 3. Kd4 Lf3 4. Ke3 Lxa8 5. Ke2 Kxg2 6. Le3 Lf3#
b) 1. Lg1 Lxe2 2. Kc3 Lxg4 3. Kd4 Lf3 4. Ke3 Lxa8 5. Ke2 Kxg2 6. Le3 Lf3#
Keywords: Minimal (L), under-promotion (s in a), Selfblock, black Bristol (in a), Twin, Switchback (K,L), Line opening (in a)
Genre: h#
FEN: b7/8/8/8/6p1/3p2p1/p1kpp1n1/b1nrqB1K
Input: Gunter Jordan, 2023-08-18
Last update: Felber, Volker, 2023-09-30 more...
Genre: h#
FEN: b7/8/8/8/6p1/3p2p1/p1kpp1n1/b1nrqB1K
Input: Gunter Jordan, 2023-08-18
Last update: Felber, Volker, 2023-09-30 more...
Show statistic for complete result. Show search result faster by using ids.
https://pdb.dieschwalbe.de/search.jsp?expression=COMMENTDATE%3E%3D20200919+AND+NOT+K%3D%27Hilfsr%C3%BCckz%C3%BCger%27+AND+S%3D%27The+Problemist%27+AND+K%3D%27Unterverwandlung%27
The problems of this query have been registered by the following contributors:
Gerd Wilts (1)Felber, Volker (6)
hpr (1)
Brian Stephenson (2)
Frank Müller (4)
Gunter Jordan (10)
A.Buchanan (2)
Mario Richter (1)
Paulo Roque: .
Solution:
1) 1. La7 KxLa7 2. c8=T! Ka6 3. Ta8#
2) Proof da legality of the answer:
Retro: 0... Ka7-a8 -1. b7-b8=L etc (2009-09-06)
Sally: Der letzte weiße Zug von Weiß kann nur Ba7xb8L gewesen sein, demgemäß enthält die Aufgabe 2 Bauernumwandlungen
in verschiedenen Figuren: in der lösung in einem turm und retrospektiv in einen Läufer.
406 Mattaufgaben mit 3 und 4 Steinen (Teil 1) Speckmann 1976 (2016-08-30)
Henrik Juel: There is even a third promotion in the threat 2.c8=D+
C+ by Popeye 4.61 (2016-08-30)
A.Buchanan: Here the threat play (1) is sound & (2) can never occur as Black has no neutral move. But if threat play is *unsound* yet can never occur, can it be safely ignored or will some directmate purists regard that as a defect? (2022-04-02)
Henrik Juel: I think not, Andrew
When I test problems, I ignore plays that do not occur (2022-04-02)
comment