Die Schwalbe

41 problem(s) found in 2540 milliseconds (displaying 41 problem(s)). [COMMENTDATE>=20200919 AND CPLUS AND K='asymmetrische Lösung'] [download as LaTeX]

1 - P0004269
Herbert Hultberg
7969 Tidskrift för Schack 03/1938
P0004269
(3+6) C+
#3
Längstzüger
1. exf6ep d5,g5 2. Db7 g5,d5 3. Dg7#
play all play one stop play next play all
Henrik Juel: The longest among the possible last moves is f7-f5, so 1.exf6ep d5 2.f7 g5 3.f8Q!?, but 3... Kh7!, so something is wrong. (2003-11-11)
HBae: Habe korrigiert. Es fehlte der wKa1 und die wDb2. (2019-10-11)
Henrik Juel: C+ by Popeye 4.61 (assuming that the condition was in effect also in last move)
Pd7 and Pg4 can be removed without affecting correctness or symmetry (2019-10-11)
Bernd Schwarzkopf: Pd7 and Pg4 are necessary. Without them last move could have been: 1.Pg6xXf5. (2021-02-06)
Mario Richter: Interestingly, the Editors of 'TfS' too thought that Pd7 and Pg4 can be omitted (s. 'TfS' 06/1938, p.124: "Går det inte lika bra utan bönderna på d7 och g4? (BL). Jo, det går visst lika bra. Men förf. har väl haft någon mening med dem också (Red.)."

I think, pawn d7 serves to prevent retractions like R: 1.Pg6xXf5, but pawn d4 is only there to complete the symmetry (i.e. Pd7 is necessary, Pg4 is not). (2021-02-06)
A.Buchanan: Doesn’t bPg4 stop 2.Dg2 as a dual? (2021-02-07)
comment
Keywords: Maximummer, En passant as key, Asymmetrical solution, Symmetrical position
Genre: Retro, 3#, Fairies
FEN: 7k/3p2p1/4p3/4Pp2/6p1/8/1Q6/K7
Reprints: (II) Problem 65-68 01/1960
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-06-03 more...
2 - P1000246
Andrej N. Kornilow
Alexander Kislyak

10666 Die Schwalbe 181 02/2000
P1000246
(15+15) C+
BP in 30,5
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. Th6 Ta3 6. Tc6 Tf3 7. a4 h5 8. a5 h4 9. a6 h3 10. a7 h2 11. a8=D h1=D 12. Da5 Dh4 13. De5 Dd4 14. Ta5 Th4 15. Sa3 Sh6 16. g8=D b1=D 17. Dgg3 Dbb6 18. Dh2 Da7 19. g4 b5 20. g5 b4 21. g6 b3 22. g7 b2 23. g8=D b1=D 24. Dgg2 Dbb7 25. Lb2 Lg7 26. Da1 Kf8 27. Kd1 Kg8 28. Kc1 Kh7 29. Kb1 Dh8 30. Ka2 Lf8 31. Lc1
play all play one stop play next play all
Reto: This is a case where strategy analysis in Stelvio is in a certain sense optimal: Only 1 strategy remains after analysis, namely the one that belongs to the solution. (2023-04-25)
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comment
Keywords: Unique Proof Game, Symmetrical position, Non-standard material (DDdd), Phoenix, Prenix, Ceriani-Frolkin Theme, Asymmetrical solution, Promotion (DDDddd)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 1 Sekunde. Keine Lösung: BP 29.5, BP 30.0.
FEN: 1nb2b1q/qqpppp1k/2R4n/R3Q3/3q3r/N4r2/K1PPPPQQ/Q1B2BN1
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-04-26 more...
3 - P1017983
Jan Hartong
The Observer 06/1920
3. ehrende Erwähnung
P1017983
(11+3) C+
#2
1. ... Kd6 2. Lg3#
1. ... Kf6 2. Lc3#
1. ... Kf4 2. Sd3#
1. ... Kd4 2. Sf3#
1. La5! Kd6 2. e5#
1. La5! Kf6 2. Lc3#
1. La5! Kf4 2. Lc7#
1. La5! Kd4 2. Sf3#
play all play one stop play next play all
BS Problemid: 2816
Authors: Hartong, Jan
Sources:
Years: 1920
Zugwechsel
A.Buchanan: Star-flights, symmetry breaking, changed mates and for once no en passant! (2022-07-15)
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comment
Keywords: Brian Stephenson Collection (2816), Symmetrical position, Symbol problem (Weihnachtsbaum), Asymmetrical solution
Genre: 2#
Computer test: C+, popeye 4.87
FEN: 4K3/4P3/8/2pPkPp1/2P1P1P1/8/1N2R2N/4B3
Reprints: 87 Kurioses Schach 1975
A11 ASymmetrie 2013
1554 Augsburger Allgemeine 08/12/2018
1108 Scobs lignea 08/12/2018
Input: Brian Stephenson, 2004-08-12
Last update: A.Buchanan, 2022-07-15 more...
4 - P1038718
Leonard Nicolaas de Jong
624 Good Companions 10/1915
P1038718
(8+5) C+
#2
1. Dd8? Sd6!

1. Db8! Sxa3 2. Lxa3#
1. ... Sb2 2. Kxb2#
1. ... Sd2 2. Kxd2#
1. ... Sxe3 2. Lxe3#
1. ... Sd6 2. Da7#
1. ... Sb6 2. Df8#
play all play one stop play next play all
more ...
comment
Keywords: Brian Stephenson Collection (23669), Symmetrical position, Asymmetrical solution, Zugzwang-Goal, discovered checkmate
Genre: 2#
Computer test: SCHECKE: popeye 4.87
FEN: 8/2Q5/2p5/p1k1p3/P1n1P3/P1K1P3/2R5/2B5
Reprints: 23D The Good Companion Two-Mover 1922
L70 Darnall Magazine 19 14/07/1987
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-03-07 more...
5 - P1106441
Manfred Zucker
31 Levelezesi Sakkhirado 10/1980
P1106441
(2+2) C+
h#3*
* 1. ... Kc3 2. Ka6 Kc4 3. Ka5 Ta3#
1. Ka7 Kc3 2. Ka6 Kc4 3. Ka5 Ta3#
play all play one stop play next play all
(MZ515)

"Fernschach-Nachrichen"
.
Felber, Volker: steingetreuer Nachläufer unter P0573457 mit der Bedingung "Duplex" (2021-03-18)
comment
Keywords: Aristocrat, Minimal, Miniature, Symmetrical position, Asymmetrical solution, Oneliner
Genre: h#
Computer test: Popeye Windows-32Bit v4.51 (100000 KB)
FEN: 8/1k6/1r6/8/8/1R6/1K6/8
Reprints: A Feladvany 1980
1852 Ideal-Mate Encyclopedia Vol.1 1999
Input: hpr, 2010-05-30
Last update: Felber, Volker, 2021-03-18 more...
6 - P1152130
Manfred Zucker
10511 Die Schwalbe 274, p. 55, 06/1956
P1152130
(4+3) C+
#4
1. Tc1 Lc7 2. Tg1 Lg3 3. Tg2 Lb8,L~ 4. Tg8#
play all play one stop play next play all

Duplicate Diagram: P1258715

(MZ1254)

vf: Franck Larose, 04.1987, Europe Echecs = P1258715
.
Stefan Felber: Steingetreuer Vorläufer von W. Pauly (PDB 1149266) (2015-11-30)
Henrik Juel: C+ Popeye 4.61 (2021-02-22)
Henrik Juel: The symmetric try fails by board asymmetry:
1.Tg1 Lg7 2.Tc1 Lc3 3.Tc2 La5! 4.Tc8+ Ld8 (2021-02-22)
comment
Keywords: Miniature Collection (0292510), Oneliner, Symmetrical position, Asymmetrical solution, Miniature
Genre: n#
FEN: 4k3/4B3/4K3/4b3/8/4p3/4P3/4R3
Input: Felber, Volker, 2010-09-12
Last update: Felber, Volker, 2021-05-02 more...
7 - P1152324
Klaus-Peter Zuncke
3066 Land og Folk 02/09/1978
P1152324
(3+2) C+
#3
1. Tf7? La5!

1. Td7! droht 2. Te7+ Kd8 3. Tf8#
1. ... Lb4 2. Txb4 Kf8 3. Tb8#
1. ... Lh4 2. Txh4 Kf8 3. Th8#
play all play one stop play next play all
ASd3
Dieter Berlin: Der Nachdruck 'Sächsische Zeitung' bezieht sich auf das Heft 'Preisbericht Informalturnier 1982',
die Aufgabe findet man auf S. 32 im Anhang. (2022-10-28)
more ...
comment
Keywords: Miniature Collection (0338445), Aristocrat, Symmetrical position, Asymmetrical solution, Minimal, Miniature
Genre: 3#
Computer test: Juel: Popeye 4.61
FEN: 4k3/8/4K3/8/3R1R2/8/8/4b3
Reprints: 6 Sächsische Zeitung , p. 32, 1982
C112A ASymmetrie 2013
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2022-10-29 more...
8 - P1165393
Werner Speckmann
The Chess Review 1939
1. ehrende Erwähnung
5. Int. Miniaturenturnier
P1165393
(4+2) C+
#3
1. Th8! g6 2. Sh6 Kh5 3. Sf7#
1. ... Kg6 2. Se7+ Kg5 3. Tf5#
play all play one stop play next play all
ASb3 SA2
vf: Nguyen VoVan, 1991, La Hoja de Ajedrez;
diese Aufgabe geistert auch als M. Vyordmann herum. Das ist aber Speckmann, siehe DSZ 03.1965, S. 108
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comment
Keywords: Miniature Collection (0059034), Symmetrical position, Asymmetrical solution, Minimal, Miniature, Indian
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 6N1/6p1/8/6k1/8/5RKR/8/8
Reprints: Deutsche Schachzeitung 3, p. 108, 03/1965
1142 Beispiele zur Ideengeschichte des Schachproblems , p. 232, 1982
B30 ASymmetrie 2013
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2023-05-05 more...
9 - P1167069
Herbert Hultberg
9313 Tidskrift för Schack 11/1947
P1167069
(3+2) C+
#3
1. Th6! gxh6+ 2. Kxh6 Kh8 3. Tf8#
1. ... g6 2. Txg6+ Kh8 3. Th1#
play all play one stop play next play all
E7d3 ASb3 mm
vf: Tuma, 01.02.1986, Pruboj;
Eligiusz Zimmer, 09.2000, Rochade Europa
more ...
comment
Keywords: Miniature Collection (0059680), Symmetrical position, Asymmetrical solution, Minimal, Miniature, Sacrifice key (T)
Genre: 3#
Computer test: SCHRECKE: popeye 4.87
FEN: 6k1/6p1/8/6K1/8/8/8/5R1R
Reprints: B26A ASymmetrie 2013
Input: Felber, Volker, 2010-09-12
Last update: Dieter Berlin, 2023-01-08 more...
10 - P1181239
Thomas R. Dawson
The Chess Amateur 12/1923
Asymmetrie-Turnier 1924
1. Preis
P1181239
(15+10) C+
s#5
1. gxf6ep+ Kxe8 2. Dg6+ hxg6 3. cxd8=S ... 4. f7+ Ke7 5. Sxg6+ Sxg6#
play all play one stop play next play all
Schwarz hat zuletzt f7-f5 gezogen, da d7-d5 an der retrograden Einsperrung des Lc8 scheitert.
Henrik Juel: C+ Popeye 4.61 after analysis
Analysis
White is missing one man, so last move was not a pawn capture
White pawns captured all six missing black men, so last move was not d7-d5
Obviously last move was not made by Ke7 or Sd8f8, so last move was f7-f5 legitimizing the ep key (2020-11-02)
comment
Keywords: Asymmetrical solution, En passant as key, Symmetrical position, Promotion (S)
Genre: Retro, s#
Computer test: C+ Popeye 4.61 after analysis
FEN: 1NRnBnRN/1pP1k1Pp/4p3/2PpKpP1/2pPQPp1/8/2P3P1/8
Reprints: 87 Asymmetry 1927
199 Mat Plus Review 01-06/2010
H2 ASymmetrie 2013
Input: Frank Müller, 2010-11-25
Last update: A.Buchanan, 2020-11-03 more...
11 - P1188453
Jan A. Rusek
544 Schachmatt 03/09/1947
P1188453
(6+4) C+
s#5
1. Kh8! h6,f6 2. g8=L f6,h6 3. Txh6+ Kxh6 4. Txf6+ Lxf6+ 5. Dg7+ Lxg7#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.1d, Brute Force (2021-11-13)
comment
Keywords: Asymmetrical solution, Symmetrical position
Genre: s#
FEN: 6K1/5pPp/6k1/5RbR/6Q1/6N1/8/8
Reprints: F21 ASymmetrie 2013
Input: Frank Müller, 2011-02-27
Last update: Marcin Banaszek, 2021-11-17 more...
12 - P1214335
Jan A. Rusek
1837 Springaren 02/1953
P1214335
(5+3) C+
s#4
1. Sd6! b5 2. Tc4 bxc4 3. Ta1 c3 4. Lc1 c2#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2a, Brute Force (2021-12-06)
comment
Keywords: Asymmetrical solution, Symmetrical position
Genre: s#
FEN: 8/1N6/1p6/8/1p6/1k6/RBR5/1K6
Input: Frank Müller, 2011-10-11
Last update: Marcin Banaszek, 2021-12-14 more...
13 - P1240448
Jorma Pitkänen
Ilta-Sanomat 1997
Dem Match Kasparow-Deep Blue gewidmet
P1240448
(15+4) C+
s#4
1. Dh2 exf6 2. Tg6 hxg6 3. Dh3+ f5+ 4. Dxf5+ gxf5#
1. Dh2 exd6 2. Tc6 bxc6 3. Da2+ d5+ 4. Dxd5+ cxd5#
play all play one stop play next play all
Spätere Versionen siehe P1240450, P1240451, P1240452 und P1240453.
Walter Lindenthal: Illegal (letzer s Zug?) (2023-08-28)
SCHRECKE: Der sK kann zuletzt von d7 oder f7 gekommen sein. (2023-08-28)
Gerald Ettl: So nebenbei habe ich mich gefragt, was die Widmung mit dem s# zu tun hat. Wenn es wenigstens eine Studie gewesen waere haette ich die Widmung einigermassen verstanden. Aber so? (2023-08-29)
comment
Keywords: Asymmetrical solution, Symmetrical position, Obvious promotion
Genre: s#
Computer test: Popeye WINDOWS-32Bit-Version 3. 73 (2048 KB)
FEN: 4B3/1p2p2p/1P1PkP1P/4P3/3BKB2/3NPN2/4Q3/2R3R1
Reprints: A harmonie 108, p. 2011, 12/2011
F38 ASymmetrie 2013
Input: Frank Müller, 2012-06-02
Last update: Alfred Pfeiffer, 2013-06-28 more...
14 - P1240452
Jorma Pitkänen
Ilta-Sanomat 1997
Version Bernd Schwarzkopf 2012
P1240452
(15+4) C+
s#4
1. Sd6 exd6 2. Tc6 bxc6 3. Da2+ d5+ 4. Dxd5+ cxd5#
play all play one stop play next play all
Urversion siehe P1240448.
Walter Lindenthal: Illegal (letzer s Zug?) (2023-08-28)
SCHRECKE: Der sK kann zuletzt von d7 oder f7 gekommen sein. (2023-08-28)
comment
Keywords: Asymmetrical solution, Symmetrical position
Genre: s#
Computer test: Popeye WINDOWS-32Bit V4.37 (379720 KB)
FEN: 2N1B1N1/1p2p2p/1P2k2P/4P3/3PKP2/3PPP2/4Q3/2R3R1
Reprints: D harmonie 109, p. 211, 05/2012
Input: Frank Müller, 2012-06-02
Last update: Frank Müller, 2012-06-02 more...
15 - P1243966
Frank Richter
1107 The Ural's Problemist 10-12/2011
3. ehrende Erwähnung
P1243966
(11+3) C+
s#11
1. Sf4 exf4 2. gxf4 e5 3. f5 Kf4 4. Tg6 Ke3 5. Ta6 Kf4 6. Ta1 Ke3 7. Td1 Kf4 8. Tg4+ Ke3 9. f4 exf4 10. Lg2 f3 11. Lf1 f2#
play all play one stop play next play all
Anton Baumann: C+ Gustav 4.2a (2022-01-19)
comment
Keywords: Asymmetrical solution, Stalemate dissolution, Symmetrical position
Genre: s#
FEN: 8/8/3RpR2/4p3/1P2B2P/2PPkPP1/4N3/4K3
Input: Frank Müller, 2012-07-05
Last update: Marcin Banaszek, 2022-01-27 more...
16 - P1268545
Herbert Hultberg
Springaren 12/1991
P1268545
(6+11) C+
s#3
1. b7? Sc7 2. b8=T Sa6!

1. h7! Sg7! 2. h8=T Sh5 3. Txh5 f3#
play all play one stop play next play all
more ...
comment
Keywords: Asymmetrical solution, Grab, Symmetrical position, under-promotion (wT), Pawn mate
Genre: s#
Computer test: SCHRECKE: popeye 4.89
FEN: 4n3/8/1P1ppp1P/3prp2/3pkp2/4p3/4K3/3NRN2
Reprints: F34 ASymmetrie 2013
Input: Frank Müller, 2013-04-26
Last update: Dieter Berlin, 2024-02-26 more...
17 - P1271907
Torsten Linss
F50 ASymmetrie 2013
P1271907
(5+2) C+
s#10
1. Lb3+ Kc6 2. Dd5+ Kb6 3. Le3+ Ka6 4. Dc6+ Ka5 5. Dc5+ Ka6 6. Lc4+ Kb7 7. Da7+ Kc6 8. Td6+ Kxd6 9. De7+ Kc6+ 10. Dd7+ Dxd7#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.1d, Brute Force (2020-10-12)
comment
Keywords: Aristocrat, Asymmetrical solution, Oneliner, Symmetrical position
Genre: s#
FEN: 3K4/8/3k4/3B4/3Q4/3R4/3B4/3q4
Input: Frank Müller, 2013-06-05
Last update: Marcin Banaszek, 2020-10-12 more...
18 - P1291919
Walter Schlüter
Aachener Anzeiger 1928
Dr. Lasker zum 60. Geburtstag gewidmet
P1291919
(8+8) C+
s#4
1. Txe3+! dxe3 2. Lxc3 d4 3. Lh2 dxc3 4. Le5 e2#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2a, Brute Force (2021-12-24)
comment
Keywords: Symmetrical position, Asymmetrical solution
Genre: s#
FEN: 8/8/3N4/p2p2p1/P2p2P1/R1pkp1R1/3p4/B2K2B1
Reprints: 7c Allgemeine Zeitung Chemnitz 06/01/1929
1478 Allgemeine Zeitung Chemnitz 25/03/1934
Input: Felber, Volker, 2014-12-03
Last update: Marcin Banaszek, 2021-12-30 more...
19 - P1320829
Wolfgang Pauly

P1320829
(3+4) C+
h#3
b) sBe6 nach e4
a) 1. Kd3 Ld6 2. Kc2 Lg6+ 3. Kc1 La3#
b) 1. Kf3 Lg3 2. Kg4 Kf2 3. Kh3 Ld7#
play all play one stop play next play all
Quelle unbekannt (v), Komponiert 1932. Das Original war um 180 Grad gedreht und benötigte zwei zusätzliche sBB.
Felber, Volker: vergleiche P1001738 und P1001739 (2016-06-01)
Yuri Bilokin: Version: -bPe6 4B3/8/8/1p2B2p/8/4k3/8/4K3 (3+3) h#3 2.1... 1.Kd3 Bd6 2.Kc2 Bg6+ 3.Kc1 Ba3# (MM)
1.Kf3 Bg3 2.Kg4 Kf2 3.Kh3 Bd7# (MM)
Asymmetry, BK moves only × 2, Exchange of functions (wBe5/wBe8, Guard / Mate) (2021-11-16)
more ...
comment
Keywords: Model mate, Symmetrical position, Asymmetrical solution
Genre: h#
FEN: 4B3/8/4p3/1p2B2p/8/4k3/8/4K3
Reprints: E13 ASymmetrie , p. 305, 2013
32 idee & form 128, p. 4311, 10/2015
Input: Felber, Volker, 2016-06-01
Last update: Alfred Pfeiffer, 2016-06-02 more...
20 - P1339905
Teppo Mänttä
Suomen Tehtäväniekat 163 05/2005
in memoriam J. Hannelius
P1339905
(2+5) C+
s#8
Circe
Längstzüger
wDU,sDU=Grashüpfer
sSU=Nachtreiter
1. Kc7! Nh3 2. Gd7 Nb6 3. Kd6 Nh3+ 4. Kxc6[+sGc1] Nb6+ 5. Kxb6 Ge8 6. Ka7 Gc6 7. Kb8 Gc7 8. Gb7 Gd6#
play all play one stop play next play all
Teppo Mänttä: Rundlauf Kb8-c7-d6xc6xb6-a7-b8. Switchback Gb7-d7-b7. (2021-04-24)
comment
Keywords: Circe, Maximummer, Minimal (wG), Symmetrical position, Asymmetrical solution, Aristocrat
Pieces: du = Grasshopper (G), su = Nightrider (N)
Genre: Fairies
Computer test: Popeye Windows-32Bit v4.73
FEN: 1K6/1*2Q6/*2q*2n*2q5/1*2q6/8/8/8/1k6
Input: HBae, 2017-09-21
Last update: HBae, 2017-09-22 more...
21 - P1347556
Teppo Mänttä
10709 Springaren (99) 09/2005
P1347556
(2+4) C+
ser-h#15
Circe
sDU=Grashüpfer
sDL=Känguruh
1. Kh1-h2 2. Kh2-h3 3. Kh3-g4 4. Gg2-g5 5. Kg4-f3 6. KÄd5-g2 7. Kf3-g4 8. KÄg2-g6 9. Gc6-h6 10. KÄg6-g3 11. Kg4-h3 12. Gh6-h2 13. Kh3-g2 14. Kg2-h1 15. Gg5-g2 Se4xg3[+sKÄg1]#
play all play one stop play next play all
Teppo Mänttä: 4th HM in the informal tourney. The award was published in Springaren nr. 108, 03/2008. Judge Göran Forslund. (2021-04-24)
comment
Keywords: Seriesmover, Circe, Symmetrical position, Asymmetrical solution, Oneliner, Aristocrat
Pieces: du = Grasshopper (G), dl = Kangaroo (KÄ)
Genre: Fairies
Computer test: %Popeye FreeBSD-5.3-RELEASE-32Bit-Version 3.81
FEN: K7/8/2*2q5/3*3q4/4N3/8/6*2q1/7k
Input: Erich Bartel, 2018-03-05
Last update: Alfred Pfeiffer, 2018-03-05 more...
22 - P1381534
Mirko Degenkolbe
7571 Kudesnik 223, p. 15, 15/03/2020
Memorial Miroslav Havel-140
P1381534
(4+1) C+
#4
b) alles 1 Feld nach links
a) 1. Ld4? Kd6!
1. Lf4! Zugzwang
1. ... Kf6 2. Lf5 Kg7 3. Lg5 Kh8 4. Lf6#

b) 1. Le4? Ke6!
1. Lc4! Zugzwang
1. ... Kc6 2. Lc5 Kb7 3. Lb5 Ka8 4. Lc6#
play all play one stop play next play all
[MD 1455]
Symmetrische Stellungen mit asymmetrischen Lösungen.
Farbwechsel-Echo-Mustermatts
Henrik Juel: The twin brings nothing new (2020-11-04)
A.Buchanan: Does the twin relate to the tourney theme maybe? (2020-11-05)
more ...
comment
Keywords: Aristocrat, Oneliner, Chameleon Echo, Symmetrical position, Asymmetrical solution, Rex solus (s), Model mate
Genre: n#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 4K3/4N3/4k3/8/4B3/4B3/8/8
Input: Felber, Volker, 2020-11-04
Last update: Felber, Volker, 2020-11-11 more...
23 - P1384836
Kurt Keller
StrateGems 93, p. 51, 01-03/2021
Happy Holidays
P1384836
(9+3) C+
#3 v
1. Kd6? Kxb5 2. Tb1+ Kc4 3. La6#
2. ... Ka4!
2. Ta1 Ka4 3. Ld7#
2. ... Kc4 3. La6#
2. ... c4!

1. Kb6! Kxd5 2. Lf5 c4 3. Td1#
2. ... Kc4 3. Le6#
play all play one stop play next play all
Happy Holidays
By Mike Prcic

As the holiday season approaches, we are reminded of the current COVID-19 pandemic. It has been a difficult time for many of us. I have been in touch with many composers. Many are suffering, especially the older ones. Some are not infected but still need medical care, which is not available, since the hospitals are swamped with COVID-19 patients. One of StrateGems’ editors lost his younger brother to COVID-19. A long-time subscriber from Italy informed me that his whole family was infected. He had the hardest time with the infection but survived and is now COVID-19 negative.
On a positive side (if there is such a thing), we all have ample time for composing (and in my case for playing online bridge). WCCT-11 should benefit from the pandemic. Nevertheless, I hope the vaccine arrives soon, is effective, and that we all can go back to our lives.
To brighten the holiday spirit, Kurt Keller has sent a composition that reminds us of the Christmas tree. Thank you, Kurt!

1.Kd6? Kxb5 2.Rb1+ Ka4! (Kc4? 3.Ba6#);
2.Ra1 c4! (2…Ka4/Kc4 3.Bd7/Ba6#)
1.Kb6! Kxd5 2.Bf5 zz c4/Kc4 3.Rd1/Be6#

(Mike Prcic (Westlake Village, CA): Happy Holidays, in: StrateGems, January 2021)
Comments:
  • Author – Kurt Keller (Ulm, Germany)
  • Yet Another Chess Problem Database (...)

more ...
comment
Keywords: Symbol problem (Christmas tree), Stalemate dissolution, Flight-giving key, Selfblock, Switchback (k,k), Line opening, Symmetrical position, Asymmetrical solution
Genre: 3#
Computer test: Henrik Juel: C+ Popeye 4.61 (2021-01-01)
FEN: 2B5/2B5/2K5/1PpP4/2k5/P1p1P3/2P5/2R5
Input: Kurt Keller, 2021-01-01
Last update: Kurt Keller, 2021-01-09 more...
24 - P1384868
Kurt Keller
2101 Gaudium 235, p. 1, 24/12/2020
Allen Gaudiumlesern zum Fest
P1384868
(10+1) C+
#4
1. Ld8! droht 2. a5 [A] droht 3. Le7#
2. ... Kd6 [a] 3. Lf6 [B] droht 4. c5#
3. ... Kc5 [b] 4. Le7#

1. ... Kd6 2. Lf6 [B] droht 3. c5#
2. ... Kc5 [b] 3. a5 [A] droht 4. Le7#
3. ... Kd6 [a] 4. c5#
play all play one stop play next play all
Den nun schon fast traditionellen Weihnachtsbaum stiftet diesmal unser Leser Kurt Keller aus Ulm. Die Löser mögen beachten, dass dieses Problem ebenfalls am Löseturnier teilnimmt!
(Gunter Jordan (Jena, Germany): Urdrucke, in: Gaudium, Ausgabe 235, 2020-12-24)

2101 (Keller) 1.Ld8! droht 2.a5 [A] (3.Le7#) Kd6 [a] 3.Lf6 [B] (4.c5#) Kc5 [b] 4.Le7#, 1. .. Kd6 2.Lf6 [B] (3.c5#) Kc5 [b] 3.a5 [A] (4.Le7#) Kd6 [a] 4.c5#. Ein Weihnachtsbaum mit thematischem Inhalt (reziproke Züge zwischen [unausführbarer] Drohung und Lösung bei Weiß und Schwarz), was bei Symbolproblemen eher selten ist. Deshalb ragt dieser Festtagsgruß aus der großen Masse heraus (der Autor beglückte im Vorjahr diverse Problemspalten mit Weihnachtsbäumen). „Ein hübscher Baum mit einer moderaten Lösung.“ [Bert Kölske] „☺“ [Berthold Leibe] „Netter Weihnachtsgruß.“ [Karl-Heinz Siehndel] „Ein etwas dürrer Weihnachtsbaum mit nur einer schwarzen Kugel wird im Zugzwang ‚ermattet‘!“ [Joachim Benn] „Eine schlichte Tanne.“ [Claus Grupen]
(Gunter Jordan (Jena, Germany): Lösungen aus Gaudium 235, in: Gaudium, Ausgabe 237, 2021-02-28)
Comments:
  • Author – Kurt Keller (Ulm, Germany)
  • Gaudium (original problem) (235)
  • Gaudium (solution text) (237)
  • Yet Another Chess Problem Database (...)

Henrik Juel: C+ Popeye 4.61 (2021-01-02)
comment
Keywords: Symbol problem (Christmas tree), Rex solus, Symmetrical position, Asymmetrical solution, Reversal 1 (AaBb-BbAa), Stalemate dissolution, Flight-giving key, Switchback (k)
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 2K5/2B5/8/1PkP4/P1P1P3/P3P3/8/2R5
Input: Kurt Keller, 2021-01-02
Last update: Kurt Keller, 2021-03-04 more...
25 - P1384873
Kurt Keller
C17 Shakhmatnaya Kompozitsiya 154, p. 3, 12/2020
Merry Christmas & Happy New Year! Счастливого Рождества и веселого Нового года!
P1384873
(8+2) C+
#4
b) -Be4
a) 1. Lc5! Kf4 2. Kg2 Kg5 3. Sh3+ Kh4 4. Lf2#
3. ... Kh6 4. Lf8#

1. La3? Kf4 2. Ld6+ Kf3 3. g5 fxg5 4. Lg4#
2. ... Kg5!

b) 1. Se4! Kf4 2. Ld6+ Kf3 3. g5 fxg5 4. Sxg5#

1. Ke1? droht 2. Ld6 droht 3. Le4#
2. ... Kg2 3. Le4+ Kg1 4. Sh3#
1. ... Kf4!

1. La3? droht 2. Lc1 droht 3. Le4+ Kf4 4. d4#
2. ... Kf4 3. d4+ Kf3 4. Le4#
1. ... Kf4 2. Ld6+ Kf3 3. Le4#
2. ... Kg5!
play all play one stop play next play all
С17. К.Келлер. a) 1.c5! f4 2.g2 g5 3.h3+ h4 4.f2#, 3...h6 4.f8#, b) -♙e4, 1.e4! f4 2.d6+ f3 3.g5 fg5 4.:g5#.
(РЕШЕНИЯ «ШК» № 154 – 2020 [SK 154])
Comments:
  • Author - Kurt Keller (Ulm, Germany)
  • Yet Another Chess Problem Database (...)

more ...
comment
Keywords: Symbol problem (Christmas tree), Symmetrical position, Asymmetrical solution, Model mate, Switchback (k), Sacrifice of white pieces, Active sacrifice, Deflection, Steering, Minimal, Twin
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 5B2/8/5p2/5B2/4P1P1/5k2/3P1N1P/5K2
Input: Kurt Keller, 2021-01-02
Last update: Kurt Keller, 2021-03-30 more...
26 - P1384874
Kurt Keller
C18 Shakhmatnaya Kompozitsiya 154, p. 3, 12/2020
Merry Christmas & Happy New Year! Счастливого Рождества и веселого Нового года!
P1384874
(8+8) C+
#4
1. Kd7? Kc5 2. Lxd6+ Kc4 3. La8 Kxb5 4. ?

1. Kb7! Kc5 2. Lxb6+ Kc4 3. Le8 Kxd5 4. Lf7#
play all play one stop play next play all
С18. К.Келлер. 1.♔d7? ♔c5! 1.♔b7! c5 2.:b6+ c4 3.e8 :d5 4.f7#.
(РЕШЕНИЯ «ШК» № 154 – 2020 [SK 154])
Comments:
  • Author - Kurt Keller (Ulm, Germany)
  • Yet Another Chess Problem Database (...)

more ...
comment
Keywords: Symbol problem (Christmas tree), Symmetrical position, Asymmetrical solution, Switchback (k), Sacrifice of white pieces, Active sacrifice, Line opening, Drag-in sacrifice
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 2K5/2B5/1pBp4/pP1Pp3/p1k1p3/P1p1P3/2P5/8
Input: Kurt Keller, 2021-01-02
Last update: Kurt Keller, 2021-01-06 more...
27 - P1385091
Kurt Keller
Best Problems 97, p. 367, 01/2020
Happy New Year 2021
Šťastný nový rok 2021
С новым годом 2021
Bonne année 2021
P1385091
(6+4) C+
#3 v
1. Le6+? A Kb4 a 2. Sd3+ B Ka4 b 3. Lb3# C
1. ... Kd4!

1. La6+! D Kb4 a 2. Sd3+ B Ka4 b 3. Lb5# E
1. ... Kd4 2. Sb3+ Ke4 3. Ld3#
play all play one stop play next play all
Kurt Keller – (Germania) Christmas card
2B5/2B5/2K5/8/2k5/p1p1p3/P3P3/2N5
≠3 (6+4) C+
1.♗e6+?
1…♔b4 2.♘d3+ ♔a4 3.♗b3‡ but 1…♔d4!
1.♗a6+!
1…♔b4 2.♘d3+ ♔a4 3.♗b5‡
1…♔d4 2.♘b3+ ♔e4 3.♗d3‡
Checking key, 2 model mates.

[...] We thank our colleagues who have sent us greetings from various
countries.

(Antonio Garofalo (Bari, Italy): EDITORIALE, in: BEST PROBLEMS, 2021 - January [BP097.pdf])
Comments:
  • Author – Kurt Keller (Ulm, Germany)
  • Yet Another Chess Problem Database (...)

more ...
comment
Keywords: Symbol problem (Christmas tree), Checking key, Model mate, Changed mates, Symmetrical position, Asymmetrical solution, Selfblock, Remote selfblock, interchange in mating position (LS (4))
Genre: 3#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 2B5/2B5/2K5/8/2k5/p1p1p3/P3P3/2N5
Input: Kurt Keller, 2021-01-07
Last update: Kurt Keller, 2021-01-30 more...
28 - P1386298
Erich Bartel
3292 Scobs lignea 07/02/2021
P1386298
(3+1) C+
#7
wSU=Nachtreiter
1. Kc6! Ka7 2. Nc5 Kb8 3. Ne4 Ka7 4. Nd7 Ka8 5. Kc7 Ka7 6. Ne5+ Ka8 7. Nd2#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 also
Asymmetry, but not very striking because of the proximity to the a-line
Still a very nice problem, which is solvable by hand (2021-02-07)
A.Buchanan: Nice to have an empty board for the nightriders to canter around in unblocked. That they are line pieces makes the uniqueness of the solution even more impressive. Someone must have already done tablebase for this endgame (2021-02-08)
comment
Keywords: Aristocrat, Oneliner (b5b8), Rex solus (s), Switchback (k), Corner mate, Ideal mate, Symmetrical position, Asymmetrical solution
Pieces: su = Nightrider (N)
Genre: Fairies
Computer test: Popeye FreeBSD-9.1-RELEASE-amd64-64Bit v4.59
FEN: 1k6/1*2N6/1*2N6/1K6/8/8/8/8
Reprints: 3293 Scobs lignea 07/02/2021
Input: Erich Bartel, 2021-02-07
Last update: James Malcom, 2021-02-08 more...
29 - P1386359
Kurt Keller
C11885 The Problemist 28-1, p. 15, 01/2021
New Year greetings
P1386359
(8+1) C+
#4

Only two #3s this time, and no excessively long moremovers. [...] Keller presents with New Year greetings a symmetrical Christmas tree – but the 2 variations are not symmetrical.
(Jim Grevatt (Headly, England): CHAMPIONSHIP ORIGINALS. THREE- and MOREMOVERS, in: THE PROBLEMIST, JANUARY 2021)
Comments:
  • Yet Another Chess Problem Database (...)
  • Meson Chess Problem Database (249089)

Rosalie Fay: 1. Ld2 zz Kf4 2. Sf1+ Kg4 3. Te4+ Kh5 4. Sg3#;
1. ... Kd4 2. Kd6 zz Ke4 3. Tf2 zz Kd4 4. Tf4#
C+ Popeye Windows-64Bit v4.69 (2023-12-31)
comment
Keywords: Symbol problem (Christmas tree), Option key, Rex solus, Switchback (k), Model mate, Battery creation, Battery play, Discovered check, Batterieabbau (Te2/Se3), Symmetrical position, Asymmetrical solution, Brian Stephenson Collection (249089)
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 8/8/4K3/3P1P2/4k3/4N3/2P1R1P1/4B3
Input: Kurt Keller, 2021-02-10
Last update: Kurt Keller, 2021-07-20 more...
30 - P1386945
Werner Keym
Augsburger Allgemeine 13/02/2021
P1386945
(6+1) C+
#2
1. ... Kxh7! 2. Le4+ Kg8 3. Sh6#
1. ... Kxf7! 2. Lf8 Ke6 3. Dd5#
2. ... Ke8 3. De7#
1. Sh6+? Kxh7 2. Le4#
play all play one stop play next play all
Schwarz hat keinen letzten Zug!
A.Buchanan: Werner opened my eyes to the delights of these “official jokes” sanctioned by Codex Article 15 through his book Eigenartige Schachprobleme. The animation does not handle them well, as the move numbering and the ordering has to be distorted as here (2021-03-04)
A.Buchanan: I expect that Werner will be delighted with this one, as it has very clean solutions and retro try, which is his aim. (2021-03-04)
more ...
comment
Keywords: Miniature, Symmetrical position, No legal last move for Black, Aristocrat, Rex solus (s), Asymmetrical solution
Genre: Retro, 2#
Computer test: Henrik Juel: C+ Popeye 4.61 (2021-03-03)
FEN: 6k1/5NBN/8/6Q1/8/8/6B1/6K1
Input: Gerd Wilts, 2021-03-03
Last update: Alfred Pfeiffer, 2021-07-30 more...
31 - P1387846
Fred Lazard

P1387846
(6+8) C+
#3
1. Lh6! (Zugzwang)
1. ... c6 2. b6 e6 3. Lf8#
2. ... Scxd3,Sc5~ 3. Sb7#
2. ... Sexd3,Se5~ 3. Sf7#
play all play one stop play next play all
"La Croix de Lorraine" (Lothringerkreuz)
vgl. P1348722 mit der gleichen Symbolik
Henrik Juel: C+ Popeye 4.61
Asymmetry (2021-03-26)
comment
Keywords: Symbol problem (Lothringerkreuz), Asymmetrical solution
Genre: 3#
Computer test: Henrik Juel (2021-03-26): C+ Popeye 4.61
FEN: 3N4/2ppp3/3k4/1PnpnP2/3p4/3P4/3B4/3K4
Reprints: 13 Combat (Paris) 25/08/1946
Input: Mario Richter, 2021-03-26
Last update: Mario Richter, 2021-03-26 more...
32 - P1389169
Thomas R. Dawson
Andrew Buchanan

PDB Website 14/10/2019
TRD, correction AB
P1389169
(4+5) C+
h#2
1. d4 Sg6 2. Tg5 Ta6#
play all play one stop play next play all
See P0515072
Henrik Juel: C+ Popeye 4.61
1.d4 Sg6 2.Tg5 Ta6#
pawn asymmetry (2021-05-02)
A.Buchanan: Yes Henrik exactly - every symmetry has to be broken somehow to make the solution unique, and here the point is that the symmetry is just visual, broken by the pawn movement rules (2021-05-02)
comment
Keywords: Symmetrical position, Asymmetrical solution, Model mate
Genre: h#
Computer test: C+ Popeye 4.61
FEN: 5N1K/8/5k1N/1r1p4/4p3/8/4r3/R7
Input: A.Buchanan, 2021-05-02
Last update: A.Buchanan, 2021-05-08 more...
33 - P1389376
Stefan Felber
Augsburger Allgemeine 05/2021
P1389376
(3+4) C+
#6
1. Lg3 Kd4 2. Db4+ Kd3 3. Db1+ Kc3 4. Kd5 e6+ 5. Kc5 e5 6. Le1#
3. ... Kc4 4. Le1 Kd4 5. Df5 Kc4 6. Dd5#
4. ... Kc5 5. Db7 Kc4,Kd4 6. Dd5#
play all play one stop play next play all
Henrik Juel: Well hidden board asymmetry
1.Lc3? Kd3! and black king avoids being mated because of the a-file (2021-05-08)
more ...
comment
Keywords: Miniature, Symmetrical position, Oneliner, Asymmetrical solution
Genre: n#
Computer test: Popeye 4.61 Other variations lead to #5 and have some duals (Henrik Juel)
FEN: 8/4p3/4K3/4B3/4k3/4p3/4p3/4Q3
Input: Rainer Staudte, 2021-05-08
Last update: Alfred Pfeiffer, 2021-08-10 more...
34 - P1390326
Sigmund Herland
342 Deutsche Schachblätter 2, p. 32, 02/1952
P1390326
(9+8) C+
#4
1. h3! h6 2. Sxg6 c5 3. Sf8+
2. ... Kf5 3. Sh4+
1. ... b6 2. d5+ cxd5 3. Sa6

1. b3? h6!
play all play one stop play next play all
more ...
comment
Keywords: Symmetrical position, Asymmetrical solution
Genre: n#
Computer test: Popeye 4.61, except for some late double threats (
FEN: 4B3/1p2p2p/2p1k1p1/4B3/1N1P1P1N/4p3/1P2p2P/4K3
Input: Dieter Berlin, 2021-05-31
Last update: Alfred Pfeiffer, 2021-09-16 more...
35 - P1391384
Rainer Staudte
1584 Troll 14 23/06/2021
P1391384
(4+2) C+
#4
b) alles drei Reihen höher
a) 1. Sd6! Ka5 2. Kc3 b2 3. Kc4 b1=D,T,L,S 4. Sb7#

b) 1. Sa6! Ka8 2. Kc6 b5 3. Sc8 b4 4. Sb6#
play all play one stop play next play all
more ...
comment
Keywords: Symmetrical position, Asymmetrical solution, Allumwandlung, unechte schwarze, Miniature
Genre: n#
Computer test: Popeye 4.61
FEN: 8/8/8/1B6/NkN5/1p6/1K6/8
Input: Rainer Staudte, 2021-07-05
Last update: Alfred Pfeiffer, 2021-12-14 more...
36 - P1394836
Andrew Buchanan
ChessBase India 21/10/2021
after Georges Glaeser
P1394836
(15+15) C+
h#2.5 (who?) b) bK->d8
a) WTM 1. ... Sc3 Sc6 2. Sxd5 Sd8 3. Sxc7#
b) BTM 1. Sc6 2. Sc3 Sxd4 3. Sd1 Sxc2#
play all play one stop play next play all
See P0005272
more ...
comment
Keywords: Parity Argument, Symmetrical position (2), Asymmetrical solution (2), Whose move?
Genre: h#, Retro
Computer test: HC+ Popeye v4.87 & trivial retro-logic
FEN: r1b1kb1r/pppppppp/8/3nn3/3NN3/8/PPPPPPPP/R1B1KB1R
Reprints: Facebook 21/10/2021
Input: A.Buchanan, 2021-10-23
Last update: A.Buchanan, 2022-02-16 more...
37 - P1396623
Kurt Keller
13151 Probleemblad 4, p. 110, 10-12/2021
Vrolijke Kerstdagen en Gelukkig Nieuwjaar
Merry Christmas and Happy New Year
P1396623
(9+2) C+
#6 v...
1. c4! Kd4 2. Kd6 droht 3. Lb5 Ke4 4. c5 Kd4 5. Sc6+ A Ke4 6. Ld3# B
2. ... Kxc4 3. La4 Kd4 4. Lb5 Ke4 5. Ld3+ B Kd4 6. Sc6# A
play all play one stop play next play all
Bij de problemen
Aan de zeszet van Kurt Keller kunnen we zien dat de tijd hard gaat. Op het moment van verschijnen van Probleemblad zijn de kersdagen en 2022 nabij. Zijn motto boven het probleem nemen we graag over: “Vrolijke Kerstdagen en gelukkig Nieuwjaar”. Hopelijk vieren we de feesten met minder coronabeperkingen dan vorig jaar. Nuttige tijdsbesteding is natuurlijk om de 15 nieuwe problemen in een gezellige sfeer op te lossen.

From Kurt Keller’s sixmover, we can see that time is going fast. At the time of publication of Probleemblad, Christmas and 2022 are near. We like to adopt his motto above the problem: “Merry Christmas and Happy New Year”. Hopefully we will celebrate the festivities with less corona restrictions than last year. Of course you can use your time well by solving the 15 new problems in a cosy atmosphere.

(Henk Prins (Sliedrecht, the Netherlands): Originele Problemen en Oplossingen. Orthodox, in: PROBLEEMBLAD, oktober-december 2021)

13151 Keller 1.c4! ♚d4 2.♔d6 ♚xc4 3.♗a4 ♚d4 5.♗b5 ♚e4 5.♗d3+ ♚d4 6.♘c6#, 2... ♚e4 3.♗b5 ♚d4 4.c5 ♚e4 5.♗d3+ ♚d4 5.♘c6# of 3.c5 ♚d4 4.♗b5 ♚e4 5.♗d3+ ♚d4 6.♘c6#. En kerstboom met lampjes. Het juiste lampje moet aangestoken worden. Veel lampjes geven kortsluitin door pat. Het lampje aan de andere kant 1.g4? faalt op 1... ♚f4! De witte lamp aan de top zou naar veld i4 moeten, maar ja, dat is buiten de kerstboom.
(Henk Prins (Sliedrecht, the Netherlands): Originele Problemen en Oplossingen. Oplossingen orthodox 2021-4 (oktober-december), in: PROBLEEMBLAD, april-juni 2022)
Henrik Juel: 1.c4 Kd4 2.Kd6 Kxc4 3.La4 Kd4 4.Lb5 Ke4 5.Ld3 Kd4 6.Sc6#
dual 2... Ke4 3.Lb5,c5 (2021-12-05)
comment
Keywords: Symbol problem (Christmas tree), Stalemate dissolution, Flight-giving key, Sacrifice of white pieces (B), Passive sacrifice, Minimal, Symmetrical position, Asymmetrical solution
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 4B3/4N3/4K3/3P1P2/4k3/2P1p1P1/4P3/4B3
Input: Kurt Keller, 2021-12-05
Last update: Kurt Keller, 2022-06-23 more...
38 - P1398986
Werner Keym
Stuttgarter Zeitung 2021
P1398986
(6+1) C+
#2
b) Drehung um 90°
a) 1. Sf7+! Kxg6 2. Ld3#
b) Mit Drehung recht:
nicht 1. Sb6+? Kxc7 2. Lf4#
sondern b) 1. ... Kxc7! Lf4+ 2. Kc8 Sb6#
play all play one stop play next play all
Absichtlich wird nicht angegeben, in welche Richtung gedreht werden soll. Wenn man die Stellung um 90° im Uhrzeigersinn dreht (wKf4), gibt es keine zweizügige Lösung. Wenn man sie um 90° gegen die Uhr dreht (wKc5), entsteht eine Stellung, in der Schwarz nicht zuletzt gezogen haben kann.
Der Bauer ist entscheidend.
It is intentionally not specified in which direction to rotate. If you turn the position 90° clockwise (wKf4), there is no two-move solution. If you turn it 90° counterclockwise (wKc5), you get a position where Black cannot have moved last.
The pawn is decisive.
A.Buchanan: There are literally hundreds of problems in PDB where "Drehung um 90 Grad" means clockwise. So reading the text here, one thinks: "Oh the stipulation is wrong - I'll correct it." The joke is so slight against the noise that it's not worth bothering with. Better to have "which way?" in the stipulation. (2022-02-10)
A.Buchanan: Also the fourth orientation unmentioned has no solution. Somehow would be nice to make reference to that "for symmetry". Maybe publish the board with unshaded squares in a diamond orientation, and ask the solver to find the two orientations that work. (2022-02-10)
more ...
comment
Keywords: Miniature, Symmetrical position, Rex solus (s), Asymmetrical solution, Twinning by board rotation
Genre: 2#
Computer test: a) C+ Popeye 4.61 b) HC+ Popeye 4.87 + trivial retro logic
FEN: 8/6N1/B3KBPk/6N1/8/8/8/8
Input: Alfred Pfeiffer, 2022-02-09
Last update: A.Buchanan, 2022-02-10 more...
39 - P1402955
Kurt Keller
3675 ChessStar 23/07/2022
P1402955
(2+5) C+
h#5
1. a4 bxa4+ 2. Kc4 a5 3. Kb5 a6 4. Ka5 a7 5. b5 a8=D,T#
play all play one stop play next play all
Comments:
SCHRECKE: Umwandlungsdual (a8T#) im Hilfsmatt ist nicht jedermanns Sache - meine auch nicht! (2022-07-23)
Henrik Juel: so the problem is not C+... (2022-07-23)
Kurt Keller: see keyword "tolerated dual promotion":
"Sometimes, the mating move is a promotion, and both D/T would mate. Similarly, sometimes D/L would both work. This is a tolerated dual under Article 13 of the Codex, because if it were not allowed, too many matrices would be invalid."
Article 13 (https://www.wfcc.ch/1999-2012/codex/):
"(2) Help-play compositions are unsound also if they are dualized, except that in the final move a promotion into different pieces having partially the same power (for example queen/rook or queen/bishop) may be tolerated [16]."
Therefore, the problem is sound (C+). (2022-07-23)
comment
Keywords: Symbol problem (cross), Kindergarten Problem, Minimal (B), Miniature, Symmetrical position, Asymmetrical solution, Sacrifice key, Sacrifice of black pieces (active), Active sacrifice, White correction (for Black), Selfblock, Switchback (k), Promotion in the mating move, Tolerated dual promotion (D/T)
Genre: h#
Computer test: Gustav 4.1 d
FEN: 8/1K6/1p6/pkp5/1p6/1P6/8/8
Input: Kurt Keller, 2022-07-23
Last update: Kurt Keller, 2022-10-28 more...
40 - P1406712
Kurt Keller
12857 feenschach 250, p. 1023, 10-12/2022
Frohe Ostern
P1406712
(3+5) C+
h=4
b) an der mittleren Horizontale gespiegelt (Kc1/Kc3)
a) 1. b5 Kd8 2. bxc4 Ke7 3. Kd5 Kf6 4. c6 Kf5=
b) 1. Kb4 Le4 2. Ka3 Lxd3 3. Ka2 Lxc4 4. Ka1 Lxb3=
play all play one stop play next play all
Comments:
  • Author – Kurt Keller (Ulm, Germany)
  • Für den Ostergruß wurde das Problem offensichtlich zu früh gebracht. Das Problem selbst ist jedoch für die Weihnachtszeit geeignet, da die beiden Kreuze auch als Weihnachtsbaum oder Kerze betrachtet werden können. (The problem was obviously brought up too early for the Easter greeting. However, the problem itself is suitable for the Christmas season because the two crosses can also be considered a Christmas tree or candle.) Vergleiche (Compare) P1388082
  • Source: Urdruckteil_250.pdf on http://www.feenschach.de

Henrik Juel: solutions
a) 1.b6-b5 Kc8-d8 2.b5*c4 Kd8-e7 3.Kc6-d5 Ke7-f6 4.c7-c6 Kf6-f5 =
b) 1.Kc3-b4 Bc6-e4 2.Kb4-a3 Be4*d3 3.Ka3-a2 Bd3*c4 4.Ka2-a1 Bc4*b3 = (2022-12-14)
comment
Keywords: Symbol problem (Doppelkreuz), Twin, Asymmetrical solution, Selfblock, Passive sacrifice, Annihilation, Remote selfblock, Sacrifice of white pieces, Sacrifice of black pieces, Active sacrifice (L), Symbol problem (Kerze), Symbol problem (Weihnachtsbaum)
Genre: Fairies
Computer test: Gustav 4.1 d
FEN: 2K5/2p5/1pkp4/2p5/2P5/2B5/8/8
Input: Kurt Keller, 2022-12-14
Last update: Kurt Keller, 2023-01-06 more...
41 - P1410943
Claus Grupen
3827 Kieler Nachrichten 10/12/2005
P1410943
(4+7) C+
#4
1. Da1! fxg2! 2. Da5+ Kd4 3. Dd2+ Ke5 4. Tc5+ Kf6 5. Dg5#
play all play one stop play next play all
sBb3 = Wiesel
Stefan Felber: Forderung korrigieren! (2023-07-16)
comment
Keywords: Asymmetrical solution, Flight taking, Schlüssel = Eckzug, Symbol problem (Kreuz), Symmetrical position
Genre: n#
Computer test: Gustav 4.1 a
FEN: 8/1K3p2/2R1p3/3k4/2p1p3/1p3p2/6B1/7Q
Input: Gunter Jordan, 2023-07-16
Last update: Gunter Jordan, 2023-07-16 more...
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