Die Schwalbe

45 problem(s) found in 2922 milliseconds (displaying 45 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND S='SuperProblem (Website)'] [download as LaTeX]

1 - P1091100
Aleksey Khanyan
SuperProblem (Website) 13/04/2009
P1091100
(2+16)
#77
1. e8=D+ Kd1 2. Dxh5+ Ke1 3. De8+ Kd1 4. Dxa4 Db1 5. Dg4+ Ke1 6. De4+ Kd1 7. Df3+ Kc1 8. Df4 d5 9. De3 Kd1 10. Df3+ Kc1 11. Df4 d4 12. Dg5 Kd1 13. Dg4+ Ke1 14. De4+ Kd1 15. Df3+ Kc1 16. Df4 a6 17. Dg5 Kd1 18. Dg4+ Ke1 19. De4+ Kd1 20. Df3+ Kc1 21. Df4 a5 22. Dg5 Kd1 23. Dg4+ Ke1 24. De4+ Kd1 25. Df3+ Kc1 26. Df4 a4 27. Dg5 Kd1 28. Dg4+ Ke1 29. De4+ Kd1 30. Df3+ Kc1 31. Df4 a3 32. Dg5 Kd1 33. Dg4+ Ke1 34. De4+ Kd1 35. Df3+ Kc1 36. Df4 b6 37. Dg5 Kd1 38. Dg4+ Ke1 39. De4+ Kd1 40. Df3+ Kc1 41. Df4 b5 42. Dg5 Kd1 43. Dg4+ Ke1 44. De4+ Kd1 45. Df3+ Kc1 46. Df4 b4 47. Dg5 Kd1 48. Dg4+ Ke1 49. De4+ Kd1 50. Df3+ Kc1 51. Df4 c6 52. Dg5 Kd1 53. Dg4+ Ke1 54. De4+ Kd1 55. Df3+ Kc1 56. Df4 c5 57. Dg5 Kd1 58. Dg4+ Ke1 59. De4+ Kd1 60. Df3+ Kc1 61. Df4 c4 62. Dg5 Kd1 63. Dg4+ Ke1 64. De4+ Kd1 65. Df3+ Kc1 66. Df4 c3 67. Dg5 Kd1 68. Dg4+ Ke1 69. De4+ Kd1 70. Df3+ Kc1 71. Df4 d3 72. De3 Kd1 73. Df3+ Kc1 74. Df4 Lg1 75. Kxg1 g2 76. Kxg2 Kd1 77. Df1#
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Original Source: http://superproblem.ru/archive/probl/N/Khanyan-77x-09.gif
Olaf Jenkner: Wirklich C+ ? (2010-08-31)
Frank Müller: Die Quelle behauptet dies. (2010-11-17)
James Malcom: The source is wrong. This was published earlier on SuperProblem.ru, which I've now corrected. (2021-02-13)
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Keywords: Minimal
Genre: n#
FEN: 8/ppp1P3/3p4/7n/r7/1p4p1/brpp2Kb/n1q1k3
Reprints: C11 Problemist of Ukraine 04/06/2009
Input: Frank Müller, 2009-09-13
Last update: James Malcom, 2021-02-13 more...
2 - P1236733
Dieter Müller
SuperProblem (Website) 31/03/2012
23. Schnellkompositionsturnier
11. Platz
P1236733
(8+3) C+
s#7
1. Dh7+ Kg5 2. Tg6+ Kf5 3. b8=L Ke4 4. Txg2+ Kf3 5. Lga7 Lxg2 6. Dh5+ Ke4 7. Df5+ Kxf5#
5. ... Kxg2 6. Dh5 Kf1+ 7. Df3+ Lxf3#
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comment

Genre: s#
Computer test: Gustav 4.1d, Brute Force
FEN: K7/1P2Q3/2R5/5k2/2P5/3N3P/6p1/6Bb
Input: Frank Müller, 2012-04-11
Last update: James Malcom, 2020-10-04 more...
3 - P1286703
Harald Grubert
F005 SuperProblem (Website) 17/02/2014
P1286703
(4+3) C+
s#11
1. Lh2 Kc1 2. Lf4+ Kb1 3. Ld6 Kc1 4. La3+ Kb1 5. Lb4 Kc1 6. Se2+ Kb1 7. Ka3 Kc2 8. Td2+ Kb1 9. Sd4 Kc1 10. Sb3+ Kb1 11. Txa2 Txa2#
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Anton Baumann: C+ Gustav 4.1d (2021-02-08)
comment
Keywords: Miniature
Genre: s#
FEN: 8/8/8/8/3N4/1K1R4/p7/rk4B1
Input: Frank Müller, 2014-08-03
Last update: James Malcom, 2021-02-08 more...
4 - P1333245
Anatoly Stepochkin
F020 SuperProblem (Website) 26/10/2014
2. ehrende Erwähnung
P1333245
(9+3) C+
s#11*
* 1. ... Lh7#
1. h6 Kg6 2. Dxg8+ Kh5 3. Lg3 Kxh6 4. Sf8 Kh5 5. Sf4+ Kh6 6. Dh7+ Kg5 7. Sh3+ Kg4 8. Sf2+ Kg5 9. Lf4+ Kf6 10. Sd7+ Ke6 11. Sd3 d5#
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Anton Baumann: C+ Gustav 4.1d (2021-03-02)
comment

Genre: s#
FEN: 2Q3b1/5k2/3pN3/3N3P/3PKB2/4PR2/8/8
Input: Frank Müller, 2017-04-15
Last update: James Malcom, 2021-03-02 more...
5 - P1334089
Evgen S. Orlov
Mykhailo Marandyuk

C054 SuperProblem (Website) 21/05/2015
Preis (#7-N)
P1334089
(5+14) C+
#11
1. Sd5! droht 2. La3+
1. ... Kb1 2. Ta3 droht 3. Txb3+
2. ... Kb2 3. Ta6! droht 4. La3+
3. ... Kb1 4. Sc3+ Kb2 5. Sxe4 Kb1 6. Sc3+ Kb2 7. La3+ Kxc3 8. Tc6+ Kd4 9. Dg4+ Ke5 10. Lb2+ Kd5 11. Df3#
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Preisbericht; http://superproblem.ru/htm/tourneys/annual-it/2015/award_moremovers_2015.html
Anton Baumann: C+ Gustav 4.1d (2021-02-02)
comment

Genre: n#
Computer test: C+ Gustav 4.1d
FEN: 2n2Kb1/1rp2p2/8/Rp6/1B2p3/1p1pN3/1k1p3r/2nQb3
Input: Felber, Volker, 2017-05-15
Last update: Alfred Pfeiffer, 2017-05-17 more...
6 - P1334113
Viktor S. Zheglov
C073 SuperProblem (Website) 04/10/2015
Lob für Miniatur (#7-N)
P1334113
(3+3)
#9
1. Sa5! Sd3 2. Kd6 Sb4 3. Kc5 Kb8 4. Kb6 Kc8 5. Td6 ... 6. Sb7 Sc6 7. Kxc6 Kb8 8. Kb6 ... 9. Td8#
1. ... Sa4 2. Tf7 Sb6 3. Sc6 Sc8 4. Tc7 Sf2 5. Kd7 Se4 6. Txc8 Kb7 7. Tb8 Ka6 8. Kc7 ... 9. Tb6#
4. ... Sg3 5. Kd7 Se4 6. Txc8 ...
5. ... Sf5 6. Txc8 Kb7 7. Tb8 Ka6 8. Kc7 ... 9. Tb6#
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Anton Baumann: C+ Gustav 4.1d (2021-03-18)
comment
Keywords: Aristocrat
Genre: n#
FEN: k7/3R4/4K3/8/8/1N6/1n6/7n
Input: Felber, Volker, 2017-05-17
Last update: Alfred Pfeiffer, 2017-05-18 more...
7 - P1334137
Bosko Miloseski
Pavel M. Arestov

C092 SuperProblem (Website) 07/02/2016
P1334137
(10+7) C+
#11
1. Ld4+! Kb2 2. c4+ Tc3 3. Ta1 Kxa1 4. Lxc3 b2 5. Ld3 f5 6. Lh8 f4 7. g7 b1=T 8. g8=T Tb2 9. Tg7 Tb1 10. Te7+ Tb2 11. Te1#
9. ... Tc2 10. Te7+ Tc3 11. Lxc3#
7. ... b1=D? 8. g8=D Db2 9. Lg7 Dc3 10. Lxc3#
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Anton Baumann: C+ Gustav 4.1d (2021-03-01)
comment
Keywords: Promotion, under-promotion, konsekutive Umwandlungen 2 (tT)
Genre: n#
FEN: 8/8/5pP1/3P1B2/1P6/ppP2PpK/p1r3P1/1k4BR
Input: Felber, Volker, 2017-05-18
Last update: James Malcom, 2021-03-01 more...
8 - P1343280
Viktor S. Zheglov
E499 SuperProblem (Website) 09/10/2017
Lob
P1343280
(2+4) C+
h#7
1. Sg7 Le8 2. Ke6 Ld7+ 3. Kf7 Lg4 4. Tc8+ Kd7 5. Th8 Lh5 6. Kg8 Ke7 7. Dh7 Lf7#
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vergleiche P1343278
Gunter Jordan: Selbstplagiat: Die gleiche Aufgabe wurde von Zheglov nochmals in Sem Schachmatnych Not, 179, Nr. 9032, 12/2020 veröffentlicht. Diesmal mit Juri G. Paramonow als "Ko-Autor". (2021-04-04)
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Keywords: Aristocrat, Remote selfblock, Ideal mate, Miniature, Minimal (L), Round Trip (L-4), Selfblock
Genre: h#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 3K4/5B2/2rk2q1/7n/8/8/8/8
Input: Felber, Volker, 2017-11-17
Last update: Gunter Jordan, 2021-04-04 more...
9 - P1366134
Anatoly Stepochkin
Yuri Paramonov

F163 SuperProblem (Website) 14/04/2019
P1366134
(5+2) cooked
s#9
b) wLa2->h4
c) wDg5->h1
a) 1. g7-g8=L+! Kf7-f8 2. d7-d8=D+ Te6-e8 3. Dd8-d6+ Te8-e7 4. Dg5-c1! Kf8-e8 5. Dd6-b8+ Ke8-d7 6. La2-e6+ Te7xe6 7. Db8-c7+ Kd7-e8 8. Lg8-f7+ Ke8-f8 9. Dc1-h6+ Te6xh6#

b) 1. Dg5-h5+! Te6-g6 2. Dh5-d5+ Tg6-e6 3. d7-d8=D Kf7-g6 4. Dd8-g5+ Kg6-f7 5. Dd5-c4! Kf7-e8 6. Dg5-d8+ Ke8-f7 7. g7-g8=S! Kf7-g6 8. Dc4-g4+ Kg6-f7 9. Sg8-h6+ Te6xh6#

c) 1. d7-d8=D! Kf7-g6 2. Dh1-h7+ Kg6-f7 3. Dh7-h3 Kf7-g6 4. g7-g8=T+ Kg6-f7 5. Dd8-d7+ Kf7-f6 6. Dh3-h4+ Ke5,Kf5 7. Tg8-g5+ Kf6 8. Tg5-d5+ Kf6-g6 9. Dd7-e8+ Te6xe8#
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Cook: Dual
c) 3. Dd8-d6 Kf7-f6 4. Dd6-f4+ Kf6-e7 5. g7-g8=L+ Ke7-e8 6. Dff7+,Dhf7+ Ke8-d8 7. Df7-c7+ Kd8-e8 8. Lg8-f7+ Ke8-f8 9. Dh6+ Te6xh6#
3. ... Kf7-e8 4. Dh7-h5+ Te6-g6 5. La2-b1 Ke8-f7 6. Lb1-f5 Kf7-e8 7. g7-g8=T+ Ke8-f7 8. Lf5-e6+ Kf7-f6 9. Dh5-h6 Tg6xh6#
Felber, Volker: Von Stjopotschkin als Alleinautor unter Weglassung des dualistischen Teils c) in THE PROBLEMIST 07/2020 (2021-02-06)
comment
Keywords: konsekutive Umwandlungen 2 (LD,DS,DT), Allumwandlung, Promotion in the key, Multiple publication
Genre: s#
FEN: 7K/3P1kP1/4r3/6Q1/8/8/B7/8
Reprints: S2811 The Problemist 27-10, p. 392, 07/2020
Input: Marcin Banaszek, 2019-08-08
Last update: Felber, Volker, 2021-02-06 more...
10 - P1366493
Valery Liskovets
SuperProblem (Website) 02/11/2015
4. Preis
154. Thematurnier
P1366493
(9+7) C+
s#6
1. Lc2? a5,h3 2. Le1 d5 3. Sd2 d4 4. Ld1 d3 5. Lb3 h3,a5 6. Sxe7 Lxe7#
1. ... d5!

1. Le1? d5 2. Sd2 a5,h3 3. Lc2 d4 4. Ld1 d3 5. Lb3 h3,a5 6. Sxe7 Lxe7#
1. ... Kb1!

1. Sd2! d5 2. La5 d4 3. Lc7 d3 4. Lg3 h3 5. Le1 a5 6. Sxe7 Lxe7#
4. ... hxg3 5. hxg3 a5 6. Sxe7 Lxe7#
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VL: A long pericritical hideaway maneuver (wB). (2020-12-11)
comment

Genre: s#
Computer test: Gustav 4.0i
FEN: 5bN1/4p1p1/p2pP1P1/8/PBN4p/KB6/7P/k7
Input: Marcin Banaszek, 2019-08-20
Last update: Marcin Banaszek, 2019-08-20 more...
11 - P1371414
Mikhail R. Kostylev
F181 SuperProblem (Website) 16/10/2019
2. ehrende Erwähnung
P1371414
(10+3) C+
s#11
1. b4+? Dxb4+ 2. Lxb4#

1. Tc6+! Kxd5 2. Dd6+ Ke4 3. Df4+ Kd5 4. Dc4+ Ke5 5. Dd4+ Kxf5 6. Df6+ Kg4 7. Dh4+ Kf3 8. Dh3+ Ke4 9. Te6+ Kd5 10. Sc3+ Kc5 11. b4+ Dxb4#
7. ... Kf5 8. Tf6+ Ke5 9. Lg3+ Kd5 10. Lc4+ Kc5 11. b4+ Dxb4#
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comment
Keywords: Checking key
Genre: s#
Computer test: Gustav 4.1d
FEN: 5Q2/1q6/3R4/2kP1P2/8/KP2P3/8/1b1NBB2
Input: Marcin Banaszek, 2020-01-04
Last update: Marcin Banaszek, 2021-02-12 more...
12 - P1381061
Valery Kirillov
Mykhailo Myshko

F201 SuperProblem (Website) 12/02/2020
P1381061
(9+4) cooked
s#13
1. Sb2!
1. ... h6 2. Te5 h5 3. Kc4+ Ka6 4. Dc8+ Tb7 5. Ted5 Kb6 6. Dc5+ Ka6 7. Dc6+ Tb6 8. Kc5+ Ka5 9. Sc4+ Ka6 10. Sd6+ Ka5 11. Da8+ Ta6 12. Da7! Txa7 13. Lc7+ Txc7#
1. ... h5 2. Da7+ Ta6 3. Sc4+ Ka4,Kb4,Kb5 4. Se5+ Ka5 5. Dc7+ Tb6 6. Dc3+ Tb4 7. Tde4 Ka4,Kb5,Kb6 8. Dc6+ Ka5 9. Lc7+ Tb6 10. Kd4 Kb4 11. Dc3+ Ka4 12. Da1+ Kb4 13. Ld6+ Txd6#
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Version zu P1202236
Cook: NL 1. Tde4! h5 2. Dc3+ Tb4 3. Sf2 Ka4,Kb6 4. Dc6+ Ka5 5. Lc7+ Tb6 6. Kd4 Kb4 7. Dc3+ Ka4 8. Da1+ Kb4 9. Sd3+ Kb5 10. Se5+ Kb4 11. Ld6+ Txd6#
Anton Baumann: Cook: NL 1.Tde4 h5 2.Dc3 Tb4 3.Sf2 Ka4,Kb6 4.Dc6+ Ka5 5.Lc7+ Tb6 6.Kd4 Kb4 7.Dc3+ Ka4 8.Da1+ Kb4 9.Sd3+ Kb5 10.Se5+ Kb4 11.Ld6+ Txd6# (2020-11-16)
comment

Genre: s#
FEN: 1B6/2Q4p/1r6/k2K4/3R3p/4R2P/2P5/3N1B2
Input: Marcin Banaszek, 2020-10-17
Last update: Marcin Banaszek, 2020-11-18 more...
13 - P1381063
James Malcom
F204 SuperProblem (Website) 20/04/2020
P1381063
(8+5)
s#15
1. a2-a4! Ke8-d8 2. a4-a5 Kd8-e8 3. a5-a6 Ke8-d8 4. a6-a7 Kd8-e8 5. a7-a8=L Ke8-d8 6. La8-d5 Kd8-e8 7. Ld5xb3 Ke8-d8 8. Lb3-d5 Kd8-e8 9. b2-b4 Ke8-d8 10. b4-b5 Kd8-e8 11. b5-b6 Ke8-d8 12. b6-b7 Kd8-e8 13. b7-b8=L Ke8-d8 14. Lb8-c7+ Kd8-e8 15. Th8-h7 Lf8xe7#
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Cook: Dual (Zugumstellung)
14. Th7 Ke8 15. Lc7 Lxe7#
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Genre: s#
FEN: 4kb1R/3pN1p1/3K2P1/4P2P/8/1p6/PP6/8
Input: Marcin Banaszek, 2020-10-17
Last update: James Malcom, 2020-12-05 more...
14 - P1381066
Grigory Popov
SuperProblem (Website) 23/04/2020
P1381066
(5+10) C+
h#3.5
1. ... Lc1 2. Kc5 Sg1 3. Kxc4 Ke1 4. Kd3 Lf1#
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http://superproblem.ru/archive/probl/Hn/Popov-h35-2020.gif
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comment

Genre: h#
Computer test: Gustav 4.1d, Brute Force
FEN: 8/4n3/1k6/4b3/2Ppp1q1/B1r2p1N/2pK2B1/7r
Input: James Malcom, 2020-10-17
Last update: Alfred Pfeiffer, 2020-10-17 more...
15 - P1381067
Grigory Popov
SuperProblem (Website) 23/04/2020
P1381067
(5+7) C+
h#3.5
1. ... Sxb1 2. Kd5 Sg1 3. Kc4 Ke1 4. Kd3 Lf1#
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http://superproblem.ru/archive/probl/Hn/Popov-h35-2020.gif
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comment

Genre: h#
Computer test: Gustav 4.1d, Brute Force
FEN: 8/8/8/4k3/3pp3/2N4N/1ppK1PB1/1n5r
Input: James Malcom, 2020-10-17
Last update: Alfred Pfeiffer, 2020-10-17 more...
16 - P1381068
Anatoly Kirichenko
SuperProblem (Website) 22/04/2020
P1381068
(5+6) C+
h#3
b) sTc2 statt sBc2
a) 1. Dd4 Sb1 2. Kc4 Ke1 3. Kd3 Lf1# abc
b) 1. Kd4 Ke1 2. Kc3 Lf1 3. Ld4 Sb1# acb
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http://superproblem.ru/archive/probl/H3/Kirichenko-h3-2020.gif
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comment
Keywords: Forsberg twin
Genre: h#
Computer test: Popeye 4.61
FEN: 8/8/8/2k5/1q2P3/1p2bP2/1ppN2B1/5K2
Input: James Malcom, 2020-10-17
Last update: Alfred Pfeiffer, 2020-10-19 more...
17 - P1381069
James Malcom
SuperProblem (Website) 21/04/2020
P1381069
(3+6) C+
h#3
1. Kg4 Lf1 2. Kf3 Ke1 3. g4 Sg1#
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http://superproblem.ru/archive/probl/H3/Malcom-h3-2020.gif
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comment

Genre: h#
Computer test: Popeye 4.61
FEN: 8/8/8/6pk/4pb2/4p1pN/6B1/3K4
Input: James Malcom, 2020-10-17
Last update: Alfred Pfeiffer, 2020-10-19 more...
18 - P1381070
James Malcom
SuperProblem (Website) 09/04/2020
P1381070
(10+5) C+
s#8
1. Ta1+! Kg2 2. Tb2+ Kf3 3. Ta3+ Ke4 4. Tb4+ Kd5 5. Ta5+ Kc6 6. Tc4+ Kb7 7. Tc7+ Kxa8 8. Ke7+ Dxf8#
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7 square route of the Black king

http://superproblem.ru/archive/probl/Sn/Malcom-s8-2020.gif
Olaf Jenkner: wBg3, +wPh2 you get a model mate (2020-10-18)
A.Buchanan: Can one begin with wTa3b3 so there is a genuine try 1. Tb1? (2020-10-19)
James Malcom: It turns out that this record was actually done, doubled, by P1371538. So a 14 square route of the Black king appears to be the record, for now anyway. (2021-01-01)
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Keywords: corner to corner, Checking key, Superseded by (P1371538)
Genre: s#
Computer test: Gustav 4.1d, Brute Force
FEN: N3KQqr/P2P4/3BP3/5P2/6p1/1R5p/R7/7k
Input: James Malcom, 2020-10-17
Last update: James Malcom, 2021-01-01 more...
19 - P1381075
Jozef Holubec
F211 SuperProblem (Website) 07/04/2020
P1381075
(7+4) C+
s#10
1. Sbd1+! Kc7 2. Txf7+ Kc6 3. Dxc4+ Kd6 4. De6+ Kc5 5. Tc7+ Kd4 6. Sc2+ Kd3 7. Td7+ Kxc2 8. Dg6+ Te4 9. Dc6+ Tc4 10. Da4+ Txa4#
1. ... Ka8 2. Dd8+ Ka7 3. Txf7+ Ka6 4. Dd6+ Ka5 5. Tf5+ Ka4 6. Sb2+ Kb3 7. Tb5+ Kc3 8. Sbd1+ Txd1 9. T5b3+ cxb3 10. Tc1+ Txc1#
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comment
Keywords: Checking key
Genre: s#
Computer test: Gustav 4.1d, Brute Force
FEN: 8/1k3b2/5R2/8/2pQ2B1/4N3/1N6/KR2r3
Input: Marcin Banaszek, 2020-10-17
Last update: Alfred Pfeiffer, 2020-10-19 more...
20 - P1381093
Marcel Tribowski
F222 SuperProblem (Website) 19/06/2020
P1381093
(11+3) cooked
s#20
1. Lc8-b7! Kd4-c5 2. Dd8-a5+ Kc5-d4 3. Da5-b6+ Ld6-c5 4. Db6-d8+ Lc5-d6 5. Te1-e2 Kd4-c5 6. Dd8-a5+ Kc5-d4 7. Da5-b6+ Ld6-c5 8. Db6-d8+ Lc5-d6 9. Kd2-e1 Kd4-c5 10. Dd8-a5+ Kc5-d4 11. Da5-b6+ Ld6-c5 12. Db6-d8+ Lc5-d6 13. Ke1-f2 Kd4-c5 14. Dd8-a5+ Kc5-d4 15. Da5-b6+ Ld6-c5 16. Db6-d8+ Lc5-d6 17. Kf2-g3 Kd4-c5 18. Dd8-a5+ Kc5-d4 19. Te2-d2+ Kd4-e3 20. Lg7-h6+ Te5-g5#
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Cook: NL: 1. Dd7! Kc5 2. Da7+ Kc6! 3. Db7+ Kc5 4. b4+ Kd4 5. Db6+ Kxc4 6. b3+ Kd5 7. Db7+ Kd4 8. Dd7 Kd5 9. Txe5+ Kd4 10. Te7+ Kd5 11. Lh6 Kd4 12. La6 Kd5 13. Ld3 Kd4 14. Dd8 Kd5 15. Kc3 Kc6 16. b5 Kc5 17. Le3+ Kd5 18. Ld2 Kc5 19. Te5+ Lxe5 20. Dd4+ Lxd4#
Anton Baumann: NL: 1.Dd7 Kc5 2.Da7+ Kc6! 3.Db7+ Kc5 4.b4+ Kd4 5.Db6+ Kxc4 6.b3+ Kd5 7.Db7+ Kd4 8.Dd7 Kd5 9.Txe5+ Kd4 10.Te7+ Kd5 11.Lh6 Kd4 12.La6 Kd5 13.Ld3 Kd4 14.Dd8 Kd5 15.Kc3 Kc6 16.b5 Kc5 17.Le3+ Kd5 18.Ld2 Kc5 19.Te5+ Lxe5 20.Dd4+ Lxd4#
5. .. Lc5 6.bxc5 Kxc4 7.b3+ Kd4 8.c6+ Kd5 9.c4+ Kd6 10.Lf8+ Te7 11.Db7 Kc5 12.Te4 Kd6 13.Kc1 Kc5 14.c7 Kd6 15.Lf5 Kc5 16.c8=D Kd6 17.De6+ Kc5 18.Td4 Kxd4 19.Db6+ Kc3 20.De1+ Txe1# (2020-11-27)
MTri: correction: wLc8 - b7, wDd8 - h8; 1.Dh8-d8 (2020-11-30)
comment
Keywords: double-check mate
Genre: s#
FEN: 2BQ4/6B1/3b4/4r3/2Pk3P/1P5P/1PPK4/4R3
Input: Marcin Banaszek, 2020-10-18
Last update: Marcin Banaszek, 2020-11-30 more...
21 - P1381269
Grigory Popov
SuperProblem (Website) 24/10/2020
P1381269
(9+10) C+
#13
1. a4+! Kc5 2. b4+ Kd5 3. c4+ Ke5 4. d4+ Kf5 5. e4+ Kg5 6. Tg4+ Kh5 7. Ta5+ b5 8. Txb5+ c5 9. Txc5+ d5 10. Txd5+ e5 11. Txe5+ f5 12. Txf5+ g5 13. Tfxg5#
play all play one stop play next play all
Record of 5+6 pawn double-steps

http://superproblem.ru/archive/probl/N/Popov-13-2020.gif
A.Buchanan: The final move "Txg5#" was now correctly marked as an error, because it was ambiguous. Thanks Gerd! (2020-11-14)
more ...
comment
Keywords: Construction task, Construction record, Checking key
Genre: n#
Computer test: Gustav 4.1d
FEN: 1N3n2/1pppppp1/R6r/1k6/7R/5K2/PPPPP1n1/8
Input: James Malcom, 2020-10-24
Last update: A.Buchanan, 2020-11-14 more...
22 - P1381270
James Malcom
SuperProblem (Website) 24/10/2020
P1381270
(11+10)
#6
1. b4+! e5 2. dxe6ep Kg6 3. c4+ f5 4. Lxf5+ Kh6 5. d4+ g5 6. Lxg5#
play all play one stop play next play all
3 pairs of pawn double-steps by White and Black

http://superproblem.ru/archive/probl/N/Malcom-6x-2020.gif
Henrik Juel: Slightly damaged by late duals after 2... Dd4 (2020-10-24)
James Malcom: But those are irrelevant, Henrik. (2020-10-24)
comment
Keywords: En passant, Checking key
Genre: n#
FEN: 4nK2/q1N1pppr/b4k2/3P4/r5P1/p6N/1PPP4/QBB5
Input: James Malcom, 2020-10-24
Last update: Alfred Pfeiffer, 2020-10-24 more...
23 - P1381287
James Malcom
SuperProblem (Website) 25/10/2020
P1381287
(5+6) C+
h#3.5
1. ... c4 2. Se4 h4 3. g5 hxg5 4. f5 d4#
play all play one stop play next play all
Record of 3+2 pawn double-steps by White and Black

http://superproblem.ru/archive/probl/Hn/Malkom-h35-2020.gif
more ...
comment
Keywords: Construction task, Construction record
Genre: h#
Computer test: Gustav 4.1d, Brute Force
FEN: 8/5pp1/3pb3/4k1n1/8/4P3/K1PP3P/8
Input: James Malcom, 2020-10-25
Last update: Alfred Pfeiffer, 2020-10-26 more...
24 - P1381288
James Malcom
SuperProblem (Website) 25/10/2020
P1381288
(7+11) C+
s#8
1. Ta5+! b5 2. Txb5+ c5 3. Txc5+ d5 4. Txd5+ e5 5. Txe5 f5 6. Txf5+ g5 7. Tgxg5+ hxg5 8. g4+ Dxg4#
play all play one stop play next play all
Record of 1+6 pawn double-steps by White and Black

http://superproblem.ru/archive/probl/Sn/Malcom-s8-2020-1.gif
more ...
comment
Keywords: Construction task, Construction record, Checking key
Genre: s#
Computer test: SCHRECKE: C+, Gustav 4.1d, Brute Force (2020-10-25)
FEN: 4n1NN/1pppppp1/R6p/7k/6R1/7K/5pPP/6q1
Input: James Malcom, 2020-10-25
Last update: Alfred Pfeiffer, 2020-10-26 more...
25 - P1381529
James Malcom
SuperProblem (Website) 05/11/2020
P1381529
(11+14)
#22
1. 0-0! droht 2. Tf8#
1. ... 0-0-0 2. Txb6+ Kc7 3. Tb7+ Kc8 4. Txb5+ Kc7 5. Tb7+ Kc8 6. Txb4+ Kc7 7. Tb7+ Kc8 8. Txb3+ Kc7 9. Tb7+ Kc8 10. Txb2+ Kc7 11. Tb7+ Kc8 12. Txb1+ Kc7 13. Tb7+ Kc8 14. Txd1 Tg8+ 15. Sg5 Kd8 16. Tdb1 Ta1 17. Txa1 exd5 18. Tb8+ Kc7 19. Txg8 dxe4 20. Tb1 d5 21. Tc8+ Kd6 22. Tb6#
play all play one stop play next play all
Longest problem with both sides castling

http://superproblem.ru/archive/probl/N/Malcom-22x-2020.gif
Henrik Juel: Popeye 4.61 with 'opt thr 1' found no flaws (2020-11-04)
James Malcom: I've managed a small extension, so do not computer test this yet. (2020-11-04)
Olaf Jenkner: Semi-finished problems should not be published. (2020-11-05)
James Malcom: I agree-this was a severe lapse in my judgement. (2020-11-05)
A.Buchanan: I think you’re being too hard on yourself, James. It’s hard to know when a problem is “finished”. Unless a position is just thrown together for a discussion, I tend to wait another sleep cycle to see if any more ideas pop up. But it’s not the end of the world if an electronically published problem gets improved a couple of days after the first post (2020-11-05)
James Malcom: I had had the previous position for a while now, but only yesterday did I see how to improve it. And the new position has now been entered. There are definite duals in the sidelines, but there is a forward, main, defense plan for Black. (2020-11-05)
comment
Keywords: Castling as key, Zwickmühle, Move Length Record
Genre: n#
FEN: r3k3/1R1pp2N/Bq1pp3/1n1P4/Pp1PP2P/rp2P3/1b6/1b1nK2R
Input: James Malcom, 2020-11-04
Last update: James Malcom, 2020-11-05 more...
26 - P1381565
Mirko Degenkolbe
C252 SuperProblem (Website) 15/05/2020
P1381565
(6+1) C+
#7
1. a5? Kg8!
1. f7? Kg7!
1. g7+? Kg8 2. Kg4!
1. ... Kh7!

1. Kg4! Zugzwang
1. ... Kg8 2. g7 Kf7 3. Kf5 Ke8 4. g8=D Kd7 5. Db8 Kc6 6. Ke6 Kc5 7. Dd6#
3. ... Kg8 4. Ke6 Kh7 5. Kf7 Kh6 6. g8=D Kh5 7. Dg5#
play all play one stop play next play all
(MD1468)
Definition:
Three trys by different white pions fail on three different escapes of the black king from the corner.
In the solution, two completely different matt images: one on the edge, which ends with pattern matt, and one surprisingly in the middle of the board.
Kindergarten problem.
Rex-solus.
Miniature.
A.Buchanan: Two of the tries are bogus in that the sK move is forced. It’s like counting a random queen check as a try if Black’s only legal reply is to capture the queen (2020-11-06)
more ...
comment
Keywords: Rex solus (s), Kindergarten Problem, Miniature, Promotion (D)
Genre: n#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 7k/8/5PP1/8/P6P/3P3K/8/8
Input: Felber, Volker, 2020-11-05
Last update: Felber, Volker, 2021-02-08 more...
27 - P1381961
James Malcom
SuperProblem (Website) 14/11/2020
P1381961
(11+6) cooked
s#13
1. bxa6! b5 2. a7 b4 3. a8=S b3 4. Sb6 cxb6 5. c7 b5 6. c8=S b4 7. Sd6 exd6 8. e7 d5 9. e8=S d4 10. Sf6 gxf6 11. g7 f5 12. g8=D f4 13. Dg3+ fxg3#
play all play one stop play next play all
13 zugzwangs-three more than the prevoious, and cooked, P1084856

http://superproblem.ru/archive/probl/Sn/Malcom-s13-2020-1.gif
Cook: Kurzlösungen
1. d4!
1. bxa6!
z.B. 1. bxa6 b5 2. d4 b4 3. d5 b3 4. d6
4. ... cxd6 5. a7 d5 6. a8=D d4 7. Dh8 d3 8. Dh6 gxh6 9. g7 h5 10. g8=D h4 11. Dg3+ hxg3#
4. ... exd6 5. Lh5 d5 6. e7 d4 7. e8=S d3 8. Sf6 gxf6 9. g7 f5 10. g8=D f4 11. Dg3+ fxg3#
(Schrecke)
SCHRECKE: siehe: P1237604, P1281775, P1335019 (2020-11-16)
more ...
comment
Keywords: konsekutive Umwandlungen 4 (SSSD)
Genre: s#
FEN: 8/2p1p1p1/ppP1P1P1/1P6/8/3P3P/1P1P1k1K/3B3R
Input: James Malcom, 2020-11-16
Last update: Alfred Pfeiffer, 2020-11-17 more...
28 - P1382267
Alberto Armeni
C173 SuperProblem (Website) 05/2018
P1382267
(4+1) C+
#4
1. Sd2! Ke1 2. Kc2 Ke2 3. Lc4+ Ke1 4. Sf3#
1. ... Kc1 2. Lb3 Kb2 3. Lc5 Kc1 4. La3#
3. ... Ka1 4. Ld4#
play all play one stop play next play all
more ...
comment
Keywords: Aristocrat, Rex solus (s), Model mate (Gnaden-), Corner mate
Genre: n#
Computer test: Popeye 4.61
FEN: 6B1/8/8/8/2N5/3K4/8/3k2B1
Input: Rainer Staudte, 2020-11-21
Last update: Gunter Jordan, 2020-12-10 more...
29 - P1382269
Alberto Armeni
C186 SuperProblem (Website) 10/2018
P1382269
(4+1) C+
#5
1. Shf5! Kg8 2. Se4 Kh7 3. Kf7 Kh8 4. Lc3+ Kh7 5. Sg5#
2. ... Kh8 3. Kf7 Kh7 4. Sg5+ Kh8 5. Lc3#
play all play one stop play next play all
more ...
comment
Keywords: Rex solus (s), Flight giving and taking key, Aristocrat
Genre: n#
Computer test: Popeye 4.61
FEN: 5k2/8/3NK2N/8/1B6/8/8/8
Input: Rainer Staudte, 2020-11-21
Last update: Alfred Pfeiffer, 2020-12-10 more...
30 - P1382270
Alberto Armeni
B138 SuperProblem (Website) 04/2018
P1382270
(3+4) C+
#3
1. Dc7! Kg2 2. Ke2 Kh3 3. Dg3#
2. ... h1=D 3. Dg3#
1. ... Kg1 2. Dxh2+ Kxf1 3. Dh1#
play all play one stop play next play all
more ...
comment
Keywords: Promotion (d), Miniature
Genre: 3#
Computer test: Popeye 4.61
FEN: 8/8/8/8/8/8/p1QK1p1p/5N1k
Input: Rainer Staudte, 2020-11-21
Last update: Gunter Jordan, 2020-12-10 more...
31 - P1382410
James Malcom
SuperProblem (Website) 25/11/2020
nach Grigory Popov
P1382410
(11+7) C+
#8
1. a4+! Kc5 2. b4+ Kd5 3. c4+ Ke5 4. d4+ Kf5 5. e4+ Kg5 6. f4+ Kh6 7. g4 Txa6 8. g5#
7. ... Lg8 8. Txh5#
play all play one stop play next play all
7 pawn double-steps by White


http://superproblem.ru/archive/probl/N/Malcom-8x-2020.gif
SCHRECKE: C+, Gustav 4.1d, Brute Force (2020-11-25)
James Malcom: Houston, we have a problem: I merely marked this as C+, and the entire position just disappeared?! (2020-12-30)
Gerd Wilts: Hi James, this was unfortunately a new bug introduced yesterday evening with a PDB update. It is now fixed. (2020-12-31)
comment
Keywords: Construction record
Genre: n#
FEN: 1N6/r2p2pb/R5p1/1k5p/7R/7K/PPPPPPP1/8
Input: James Malcom, 2020-11-25
Last update: Gerd Wilts, 2020-12-31 more...
32 - P1383329
James Malcom
SuperProblem (Website) 24/12/2020
P1383329
(6+7)
h#4.5
1. ... c4! (Kb3?) 2. Th4 g4 3. Th7 h4 4. Dh6 f4 5. Lf7 f5#
play all play one stop play next play all
4 pawn double steps by White

http://superproblem.ru/archive/probl/Hn/Malkom-h45-2020.gif
SCHRECKE: C+, Gustav 4.1d, Brute Force (2020-12-25)
Ladislav Packa: Construction can be more economical, the solution is the same:
Ka2, Pc2, f2, g2, h2 (5) - Kg6, Qc1, Rf4, Be8, Bg7, Pf6 (6)
C+ by Popeye v4.77 (2020-12-25)
James Malcom: Very beautiful economization Ladislav! (2020-12-26)
Olaf Jenkner: siehe auch die kürzere Fassung P1384242 (2020-12-26)
comment

Genre: h#
FEN: 4b3/6p1/2p2pk1/8/K4r2/P7/2Pq1PPP/8
Input: James Malcom, 2020-12-25
Last update: James Malcom, 2020-12-25 more...
33 - P1384827
Vasyl Markovtsii
A227 SuperProblem (Website) 03/04/2020
P1384827
(3+4)
#2
1. Ta5!
play all play one stop play next play all
Henrik Juel: Duals after 1... Sb7,Sc6 (2021-01-01)
SCHRECKE: With sSd8 on h8 it's a correct "Gebundener Fleck":
1.Ta5! (2.De5,Dg5,Df1#) e5/g5/Sf7 2.D:e5/D:g5/Df1# (2021-01-01)
comment
Keywords: Miniature, anticipated (P1162959)
Genre: 2#
FEN: 3n1K2/R7/4pkp1/1Q6/8/8/8/8
Input: Rainer Staudte, 2020-12-31
Last update: Felber, Volker, 2021-01-09 more...
34 - P1384975
Frank Richter
SuperProblem (Website) 04/01/2021
P1384975
(6+5) C+
h#3.5
1. ... d4 2. Shf4 h4 3. h5 g4 4. hxg4 e4#
play all play one stop play next play all
Frank Richter: 4+1 pawn double steps by White and Black
Siehe auch P1383329 und P1384242 (2021-01-05)
James Malcom: See also the earlier 3+2-P1381287 (2021-01-05)
comment
Keywords: Construction task
Genre: h#
Computer test: O. Jenkner: Gustav 4.1 d
FEN: 8/7p/5qn1/5kN1/8/7n/3PP1PP/3K4
Input: Olaf Jenkner, 2021-01-04
Last update: Frank Richter, 2021-04-13 more...
35 - P1385039
Igor Agapov
B208 SuperProblem (Website) 2020
P1385039
(3+1)
#3
1. d7! droht 2. d8=D+ Kg6 3. Dg5#
1. ... Ke6 2. d8=T! Kf6 3. Td6#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61, except for mate duals in threat: 2... Ke6 3.Ddd6,Dc4,Dce7,Dcd7# (2021-01-05)
comment
Keywords: Rex solus (s), Promotion (D), under-promotion (T)
Genre: 3#
FEN: 8/2Q5/3P1k2/8/5K2/8/8/8
Input: Rainer Staudte, 2021-01-05
Last update: Gunter Jordan, 2021-01-05 more...
36 - P1385040
Igor Agapov
B232 SuperProblem (Website) 2020
P1385040
(5+1)
#3
1. Le4! Kc4 2. c3! Kxc3 3. Tc2#
1. ... Kb2 2. c4+ Ka1 3. Ld4#
2. ... Kc3 3. Tc2#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2021-01-05)
comment

Genre: 3#
FEN: 8/8/8/3B4/K7/2k1B3/2P4R/8
Input: Rainer Staudte, 2021-01-05
Last update: Rainer Staudte, 2021-01-05 more...
37 - P1385043
Vladimir P. Shumarin
A250 SuperProblem (Website) 15/12/2020
P1385043
(6+1)
#2
1. Da7? Kxf6 2. De7#
1. ... Kh6 2. Ld2#
1. ... Kf4 2. De3#
1. ... Kh4!

1. Dc2? Kh6 2. Dg6#
1. ... Kf4 2. Df5#
1. ... Kxf6!
1. ... Kh4!

1. Dd7! Kxf6 2. De7#
1. ... Kh6 2. Ld2#
1. ... Kh4 2. Dg4#
1. ... Kf4 2. Df5#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2021-01-05)
comment

Genre: 2#
FEN: 4K3/8/5N2/6k1/QB6/8/5P2/1B6
Input: Rainer Staudte, 2021-01-05
Last update: Rainer Staudte, 2021-01-05 more...
38 - P1385048
Vladimir P. Shumarin
A247 SuperProblem (Website) 11/12/2020
P1385048
(5+2)
#2
b)c2<->e2 Df8->h7
a) 1. De8? droht 2. Db5#
1. ... La4 2. Dxa4#
1. ... Lxd3!

1. Kc6? droht 2. Dc5#
1. ... La4+!

1. Df5! droht 2. Db5# 2. Dc5#
1. ... Lxd3 2. Dc5#
1. ... La4 2. Dc5#
1. ... Kb4 2. Db5#

b) 1. Dd7? droht 2. Da4# 2. Db5#
1. ... Kb4 2. Db5#
1. ... Lxd3!

1. Da7? droht 2. Dc5# 2. Da4#
1. ... Lxd3 2. Dc5#
1. ... Kb4!

1. Df5! droht 2. Db5# 2. Dc5#
1. ... Lxd3 2. Dc5#
1. ... Kb4 2. Db5#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2021-01-05)
comment
Keywords: Minimal, Miniature
Genre: 2#
FEN: 5Q2/8/3K4/8/2kN4/3R4/2b1P3/8
Input: Rainer Staudte, 2021-01-05
Last update: Rainer Staudte, 2021-01-05 more...
39 - P1385049
Vyacheslav Pilchenko
A249 SuperProblem (Website) 14/12/2020
P1385049
(3+2)
#2
b)wBb5
a) 1. Tc4? Lh2,L~ 2. Ta4#
1. ... La7 2. Sc7#
1. ... Lc7!

1. Tc6! Lh2,L~ 2. Ta6#
1. ... La7 2. Sc7#

b) 1. Tc6? Ka7,L~ 2. Ta6#
1. ... La7!

1. b6! Lh2,L~ 2. Ta5#
1. ... La7 2. b7#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2021-01-05)
comment
Keywords: Miniature, Forsberg twin, Aristocrat (in a)
Genre: 2#
FEN: kbK5/8/8/1NR5/8/8/8/8
Input: Rainer Staudte, 2021-01-05
Last update: Felber, Volker, 2021-01-09 more...
40 - P1385531
Andrzej Babiarz
SuperProblem (Website) 11/2015
P1385531
(4+3) C+
s#5
1. Le2! c5 2. Da8 c4 3. Da3 c3 4. Tc2+ Kxc2 5. Db2+ cxb2#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.1d, Brute Force (2021-01-19)
comment
Keywords: Miniature, Pawn mate, Discovered check, Corner mate, Model mate
Genre: s#
Computer test: Gustav 4.1d, Brute Force
FEN: 8/8/2p5/8/8/1p3B2/1R4Q1/K1k5
Input: Rainer Staudte, 2021-01-19
Last update: Marcin Banaszek, 2021-01-24 more...
41 - P1385969
Grigory Popov
SuperProblem (Website) 01/10/2019
P1385969
(2+16)
#12
1. 0-0! f2+ 2. Kg2 Lc6+ 3. Kxg3 Le5+ 4. Kh4 Lf6+ 5. Kh3 Ld7+ 6. Kg2 Lc6+ 7. Kxf2 Lh4+ 8. Kg1 Lf2+ 9. Kh2 Lg3+ 10. Kxg3 Ld5 11. Ta1+ La2 12. Txa2#
play all play one stop play next play all
http://superproblem.ru/archive/probl/N/Popov-12x-2019.gif

Record length for K+R minimal with castling
James Malcom: See also https://www.yacpdb.org/#489305 (2021-01-29)
Henrik Juel: Ruined by the shorter solution in 7
3... Le5+ 4.Kxf2 Lg3+ 5.Kxg3 Ld5 6.Ta1+ La2 7.Txa2#
3... Lh4+ 4.Kxh4 Sg6+ 5.Kg3 or 4.Kh2 Lg3+ 5.Kxg3 etc. (2021-01-29)
SCHRECKE: shorter: 4.K:f2 Lg3+ 5.K:g3 Ld5 6.Ta1+ La2 7.T:a2#
Where is the fault? (2021-01-29)
James Malcom: I fixed the fault. The bNf8 is now on g8. (2021-01-29)
comment
Keywords: Castling, Minimal, Homebase, Move Length Record
Genre: n#
FEN: qr2b1n1/rpn5/kp3b2/1p6/1p1p4/2p2pp1/8/4K2R
Input: James Malcom, 2021-01-29
Last update: James Malcom, 2021-01-29 more...
42 - P1385979
Sergey Smotrov
F235 SuperProblem (Website) 20/11/2020
P1385979
(4+6)
s#20
1. De5+! Kc4 2. De4+ Kc3! 3. Tc5+ Kb3 4. Tb5+ Kc3 5. Lb4+ Kb3 6. Lf8+ Kc3 7. Dc6+ Kd4 8. Tb4+ Ke5 9. Te4+ Kf5 10. De6+ Kg5 11. Dh6+ Kf5 12. Tf4+ Ke5 13. Dg5+ Ke6 14. De7+ Kd5 15. Dd7+ Ke5 16. Ld6+ Kd5 17. La3+! Ke5 18. Tf5+ Ke4 19. De6+ Kd4 20. Lxb2+ Txb2#
play all play one stop play next play all
Henrik Juel: Popeye 4.61 with 'opt non 1 1 thr 0' found no flaws (2021-01-29)
comment
Keywords: Checking key, Perpetual check
Genre: s#
FEN: 8/4B3/4Q3/5R2/3k4/8/rp2K2n/r4n2
Input: Marcin Banaszek, 2021-01-29
Last update: Gunter Jordan, 2021-01-29 more...
43 - P1385984
Yuri Paramonov
F239 SuperProblem (Website) 30/11/2020
P1385984
(5+2) C+
s#15
1. De3+! Kh2,Kh4 2. Df2+ Kh3 3. Tg3+ Kh4 4. Tc3+! Kg5 5. Dg3+ Kf5,Kf6/Kh6 6. De5+/Dh4+ Kg6 7. Dh5+ Kf6 8. Tf7+ Ke6 9. Lg4+ Kd6 10. Tf6+ Ke7 11. Df7+ Kd8 12. Dg8+! Ke7 13. Te6+ Kd7 14. Tee3+! Kd6 15. Dd5+! Dxd5#
play all play one stop play next play all
more ...
comment
Keywords: Aristocrat, Minimal (D), Miniature, Checking key, Perpetual check, Epaulettenmatt
Genre: s#
Computer test: Gustav 4.1d
FEN: q7/1R2Q3/8/8/3K4/7k/8/3B2R1
Input: Marcin Banaszek, 2021-01-29
Last update: Marcin Banaszek, 2021-01-31 more...
44 - P1385993
Ivan Soroka
F246 SuperProblem (Website) 21/12/2020
after Andrey Lobusov
P1385993
(8+12)
s#14
Main plan: 1. Sb3? fails because 1. ... d2+! or 1. ... cxb3!
1st step: elimination of Pawn c4:
1. Se6! droht 2. Sxd4+ Lxd4#
1. ... Kd5 2. Sg5+ Kc6 3. Se5+ Kc5 4. La7+ Kd6 5. Sxc4+ Kc6
2nd step: elimination of Pawn d3:
6. Se5+ Kd6 7. Lb8+ Kc5 8. Sxd3+ Kc6
3rd step: switchback of white pieces to their initial position
9. Se5+ Kc5 10. Sd7+ Kc6 11. Se6! Kd5 12. Sec5+ Kc6
4th step: main plan implementation:
13. Sb3! ... 14. Sxd4+ Lxd4#
play all play one stop play next play all
Lobusov's work: S1357v, The Problemist 11/1990, S#10 - P1297222
Henrik Juel: Popeye 4.61 with 'opt non 0 1' found no flaws (2021-01-29)
comment

Genre: s#
FEN: 1B4B1/1R1N4/P1k5/P1N4n/2pp4/2pp4/p1p4p/1bK3br
Input: Marcin Banaszek, 2021-01-29
Last update: Marcin Banaszek, 2021-01-29 more...
45 - P1387012
Antanas Vilkauskas
Nikolai Zujew

E770 SuperProblem (Website) 23/05/2019
P1387012
(3+9) C+
h#5
2.1...
1) 1. e1=T+ Tf1 2. Te4 Kxg2 3. Kd4 Td1+ 4. Ke3 Kf1 5. Lf4 Td3#
2) 1. Lc6 Txg4 2. Lb5 Kxg2 3. Lf4 Kf3 4. Kc4 Kxf4 5. c5 Ke5#
play all play one stop play next play all
A.Buchanan: 1) We really need a better way to tag individual solutions. The comma normally separates phases e.g. promotion(S,T), and we should logically extend this. If there is a parameter, then this can be done elegantly as e.g. promotion(,T), but if there is no parameter, then what to do? Maybe e.g. "model mate(@,)" What do you think?
2) Proliferation of keywords is all very clever, but until they are populated, they are useless, and overlapping ones without an overall plan are very counter-productive. So here we see *four* over-specialized keywords for discovered checks. It's not trivial to fix, so please let's not dig the hole any deeper.
3) Under-promotion is only meaningful for direct mates and studies (and even there is redundant with parameters). I will always remove it in help & self compositions if I comes to my attention, and ultimately hope Gerd can run some script to replace all inappropriate occurrences.
4) Please can someone provide descriptions for Selfblock and Tschumakow.
Thanks so much! :D (2021-03-06)
Viktoras Paliulionis: Definitions of Self-block and Chumakov:
http://helpman.komtera.lt/definition/Self-block
http://helpman.komtera.lt/definition/Chumakov_theme (2021-03-06)
A.Buchanan: Thanks for these definitions. In the end, PDB should have automatic discovery of as many keyword assignments as possible, like Helpmate Analyzer and WinChloe do today. Gerd is just beginning to explore this for very simple stuff, but it presupposes for most keywords that the solutions are known.
Selfblock: "The opposite side takes advantage of it." What does this mean exactly in the context of help stipulations, or where the non-mating K is blocked?
Chumakov/Tschumakow Theme:
The qualifiers "basic" & "simplified" are misleading. The underlying weakness is a failure to name the atom of Chumakov: a single unit which behaves differently in different phases. So-called "basic" is really "doubled", and so-called "simplified" is "symmetric".

"Belfort" suffers from the same refusal to identify the singular, and only accept talking in plurals. The Belfort Theme in some random tourney a long time ago was defined on more than one piece exhibiting the property, but one really wants to talk of a Belfort piece, even though a single Belfort piece is nothing to celebrate. But from a *naming* point of view, we should have it. (2021-03-07)
Viktoras Paliulionis: This definition of selfblock is generic. In the case of a helpmate, it is important that the piece that moved to the king's field is actually needed in the mating position as a blocker. Otherwise, if the king’s field is guarded by White, then the move to this field is not a selfblock, the motive for such move may be, for example, line-closing or hideaway (the piece could be removed in the final position without affecting the mate).
Selfblocking can also occur in White's play, but only as a negative effect (AntiZielElement) followed by an unblocking (selfblock/unblock). (2021-03-08)
Viktoras Paliulionis: Only the first form is the real theme of Chumakov. Such a definition of the theme is found in most sources. Additionally, the theme can have a double form (2+2), (3+3) or even (4+4).
The second interpretation of the theme also is used, but actually it is a different theme, it is just an exchange of functions (captured/selfblock). This is a simpler theme to implement, that's why I called it "simplified Chumakov". (2021-03-10)
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Keywords: discovered checkmate (in 2), Battery creation (in 2), Batteriematt horizontal (in 2), Königsbatterie (in 2), Model mate (in 1), Checking key (in 1), Selfblock, Promotion in the key (t,), Tschumakow Theme
Genre: h#
Computer test: C+ Popeye 4.61
FEN: b7/2p5/3b4/2k5/5Rp1/2p3p1/2P1p1p1/6K1
Input: Gunter Jordan, 2021-03-05
Last update: A.Buchanan, 2021-03-06 more...
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