Die Schwalbe

168 problem(s) found in 915 milliseconds (displaying 100 problem(s)). [k='50'] [download as LaTeX]

1 - P0000003
Nikita M. Plaksin
(4) Die Schwalbe 97 02/1986
Spezialpreis
P0000003
(12+14)
#1
Der letzte B-Zug war g7-g5
1. e3 Sxc3# (1. Ke1??)
play all play one stop play next play all
Mario Richter: The position can be reached from the initial game array in less than 50 moves, with bPg7 playing Pg7-g6-g5, so something must be completely wrong here. (2009-04-23)
Mario Richter: As D.Baibikov informed me, I misinterpreted the stipulation: "Der letzte B-Zug war g7-g5" is part of the stipulation, so the position should be analyzed under the assumption, that the last pawn move in the game leading to the diagram was Pg7-g5. This makes my earlier comment of course obsolete ... (2010-04-25)
hans: 1. Sxc3#/Sa3#/Sd2#/Sg3# (not fxg1Q/R# for g7-g5 is last B-move.)
R: 1. d4xRe5 Bh6-g7 2. Bg7-f8 Re6-e5 (R to b8, Q to d8, K to e8, B to f8)Wb makes tempomoves, and after g7-g5 can Black retract the other pawns. (2010-04-26)
A.Buchanan: Smallest used probid number in PDB. All the early numbers are retros, because that's where Gerd's interest initially lay, I guess. (2017-10-05)
Henrik Juel: Hans's retroplay does not work, because last pawn move was g7-g5, not d4xTe5, and his forward play argument is invalid
White captured [Lc6] and dxTe
Black captured [Lf1], a7xb6, hxLg, and g3xf2
White has no last move, so he has the move; but he cannot mate, so the stipulation must refer to Black, who mates with fxg1=DT, Sg3, or bS~, depending on what White plays
The retroplay is something like
-1... Lh6 -2.Lg7, retract Kg8 via a7 and f5 to d1, Sa3-b1, Ta1 out, Kd1 to h7, Ta1 to b8, Dc5 to d8, Kh7 to e8, Lf8-h6, and g7-g5 is just in time, if my counting is correct
The En passant Keyword makes little sense; White could capture hxg6ep, but did not (2017-10-05)
Henrik Juel: tiny typo: Black captured hxg, not hxLg (2017-10-06)
A.Buchanan: I agree with your count :D (2017-10-06)
comment
Keywords: 50 move rule, Constrained problem
Genre: Retro
FEN: N4Bk1/1pppppb1/1p6/2q1P1pP/8/1PP2P2/P3PpP1/rn3KRn
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2017-10-06 more...
2 - P0000004
Valery Liskovets
Nikita M. Plaksin

Die Schwalbe 97 02/1986
P0000004
(11+12)
#1 vor 51
VRZ, Typ Proca
Retro: 1. g2! (1. g3/hxg4/Nb6? will only lengthen the game) Nh6 2. Nb6 N-49. Nc8 N-! (49. ... b7/b6? 50. Rb5 & 1. Rxb7/axb6#) 50. Nb6 N- 51. Nc8 & 1. axb6ep#!! only this possibility of ep at the first move justifies 100 subsequent half-moves (preceding the retro- key) without a draw.

R: 1. g2-g4! Sh6-g8 2. Sb6-c8 Sg8-h6 3. Sc8-b6 Sh6-g8 4. Sb6-c8 Sg8-h6 ... 49. Sc8-b6 Sh6-g8 50. Sb6-c8 Sg8-h6 51. Sc8-b6 Sh6-g8 52. axb6ep#
play all play one stop play next play all
Keywords: 50 move rule, En passant, Defensive Retractor, Type Proca
Genre: Retro
FEN: KNN3n1/n1kPPP1p/P1Prpp2/PpRp4/ppp3P1/8/8/8
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-04-19 more...
3 - P0000045
Valery Liskovets
Nikita M. Plaksin

5588 Die Schwalbe 100 08/1986
P0000045
(11+13)
#1 vor 138
VRZ, Typ Proca
Schwarze Schlagfälle cxb, dxc, exd, f7xe6 & h7xg6.
Weiße Schlagfälle axb, b4xc5, bxd.
Retro: 1. g4-g5! Sg3-h5! (1. Sc8-b6? Lg4-f5! verlängert das Rückspiel auf Grund der Regel der dreifachen Stellungswiederholung) 2. Sc8-b6 L~~~ 40. Sc8-b6 L~ 41. Sb6-c8 Sh5-g3! 42. Sc8-b6! (Es gibt nur 10 mögliche Felder für den L, von denen jedes zweimal mit Sb6 und zweimal mit Sc8 betreten werden kann. Daher haben wir 40 Züge. Nach 41. ... L~ wäre nun der En-passant-Schlag das einzige Mittel, einem illegalen Remis auszuweichen: 42. Sc8-b6 & 1. a5xb6ep#) 42. - Sf4-h5 43. g3-g4 S~ 44. Sb6-c8 S~ ... 86. Sb6-c8 S~ 87. Sc8-b6 Lf3~! 88. g2-g3! S,L~ (Das Retro-Spiel nach 43. g3-g4 beginnt mit dem weißen Sc8. Wenn 88. Sb6-c8? Lg2-f3! 89. Sc8-b6 Lf3-g2! 90. Sb6-c8 Le4-f3 91. Sc8-b6 Lf3-e4! Gerade rechtzeitig, 49. Zug. Jetzt erzeugt 92. Sb6-c8?? die 3. Stellungswiederholung ohne en-passant-Schlag und somit ein illegales Remis. Wenn der weiße S auf b6 ist, kann Schwarz die 50-Züge-Remis-Regel anwenden. 42. g3-g4? S~ 43. Sc8-b6 S~ 44. Sb6-c8 S~ ... 91. Sc8-b6 L~! 92. Sb6-c8?? verhindert den En-passant-Schlag und führt somit zu einem illegalen Remis. In beiden Fällen ist Weiß auf den Retrozug 92. g2-g3? beschränkt. 92. g2-g3?) Nach 88. g2-g3 beschränkt nur noch die 50-Züge-Remis-Regel das Retro-Spiel. 89. Sb6-c8 S,L~ ... 136. Sc8-b6 S,L~ 137. Sb6-c8 S.L~ 138. Sc8-b6 & 1. a5xb6ep #!
(136. - b6-b5? 137. Tb5-b4 & 1. a5xb6#; 136. - b7-b5? 137. Tb6-b4 & 1. Txb7#)
Synthese zweier Ideen der Autoren: Die 50-Züge-Remis-Regel und die Regel der dreifachen Stellungswiederholung in Verbindung mit der Legalität des En-passant-Schlags.

B can visit each square no more than twice on odd and twice on even moves, otherwise a draw would stop the game by the 3 times repetition rule.
play all play one stop play next play all
Keywords: 50 move rule, Draw by repetition, Defensive Retractor, Type Proca
Genre: Retro
FEN: K7/n1kPP1p1/1NPrp1p1/PpRp1bPn/pRp5/1p6/2P5/N7
Reprints: H28 FIDE Album 1986-1988 1995
Input: Gerd Wilts, 1995-06-03
Last update: Nikolai Beluhov, 2011-05-06 more...
4 - P0000087
Andrey Frolkin
6016 Die Schwalbe 107 10/1987
3. Lob
P0000087
(13+13)
Ist #1 möglich?
Keywords: 50 move rule, Non-standard material, Promotion (TTTt), Sliding block puzzle
Genre: Retro
FEN: k1BBbRRR/ppKPb1Rr/3pPrrR/4pppp/8/8/5PPP/8
Reprints: 542 Ukrainisches Album 1986-1990
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-10 more...
5 - P0000189
Wolfgang Dittmann
7108 Die Schwalbe 125 10/1990
1. Preis
P0000189
(15+14)
Ist die Stellung legal?
KBP Schlagschach
mit 50-Züge-Remisregel
1. Sa3 Sa6 2. c3 Sb4 3. cxb4 g6 4. Sc4 Sh6 5. Db3 Sf5 6. Dc3 Tg8 7. Df6 exf6 8. b5 Sg7 9. Kd1 Se6 10. Kc2 Sg5 11. Kc3 Lh6 12. Sa3 Ke7 13. Sc2 Ke6 14. Se1 Kd5 15. Kb3 b6 16. ... Df8 17. ... Dg7 18. ... Lb7 19. ... Tad8 20. Kb4 La8 21. Sd3 a6 22. bxa6 Lc6 23. Kc3 La4 24. Kb4 Lc2 25. Se1 Lf5 26. Kc3 Ke4 27. Sc2 Tde8 28. Sb4 Te6 29. Kc4 Tge8 30. a7 T8e7 31. a8=D Ke5 32. Da3 Dg8 33. Db3 Lg7 34. Dd1 Ke4 35. Sc2 Te8 36. Se1 T6e7 37. Kc3 Se6 38. Kb4 Kd5 39. Sef3 Tb8 40. De1 Lc2 41. Kc3 La4 42. Kd3 Lc6 43. Dd1 Lb7 44. Se1 Lc8 45. Sc2 Ke5 46. Sa3 Sd8 47. Sb1 Sc6 48. Sc3 Dd8 49. Dc2 Te8 50. Db1 Se7 51. Kc2 Kd6 52. Sf3 Ke6 53. Se1 Lf8 54. Sd3 ... 55. Kd1 ... 56. Ke1 ... 57. Dc2 ... 58. Dd1 ... 59. Sb4 ... 60. Sc2 Lg7 61. Sb1 Sd5 62. Sd4 Ke5 63. Sf3 Ke4 64. Sg1 Te6 65. Sa3 Td6 66. Sc2 Lf8 67. Sh3 Kf5 68. Sd4 Ke5 69. Sf3 Ke4 70. Sfg1 Kd4 71. Tb1 Se7 72. ... Sg8 73. ... Sh6 74. ... Td5 75. ... Lc5 76. ... Td6 77. ... Tc6 78. ... Lb7 79. ... Dc8 80. Ta1 Ta8 81. Sg5 remis
play all play one stop play next play all
Keywords: 50 move rule, Pronkin Theme (D), Losing Chess, Non-Unique Proof Game, Promotion
Genre: Retro, Fairies
FEN: r1q5/1bpp1p1p/1pr2ppn/2b3N1/3k4/8/PP1PPPPP/R1BQKBNR
Reprints: H20 FIDE Album 1989-1991 1997
feenschach 137 08-09/2000
70 Der Blick zurück 2006
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-08-13 more...
6 - P0000228
Gyula Breyer
The Chess Amateur 1922
A. Kornilow gewidmet
Korrekturfassung Gerd Wilts
Spezialpreis
P0000228
(13+13)
Welches waren die letzten 96 Einzelzüge?
R: 1. ... Db6-b5 2. Tb5-a5 Da5-b6 3. Tb6-b5 Lb5-a4 4. Ta4-b4 Db4-a5 5. Ta5-a4 La4-b5 6. Tb5-b6 Tb6-a6 7. Ta6-a5 Da5-b4 8. Tb4-b5 Lb5-a4 9. Ta4-b4 Lb4-a3 10. Ta3-a4 Da4-a5 11. Ta5-a6 La6-b5 12. Tb5-a5 La5-b4 13. Tb4-b5 Db5-a4 14. Ta4-a3 Ta3-b3 15. Tb3-b4 Lb4-a5 16. Ta5-a4 Da4-b5 17. Tb5-a5 La5-b4 18. Tb4-b3 Db3-a4 19. Ta4-b4 Lb4-a5 20. Ta5-b5 Lb5-a6 21. Ta6-a5 La5-b4 22. Tb4-a4 La4-b5 23. Tb5-b4 Lb4-a5 24. Ta5-a6 Ta6-b6 25. Tb6-b5 Lb5-a4 26. Ta4-a5 La5-b4 27. Tb4-a4 La4-b5 28. Tb5-b6 Lb6-a5 29. Ta5-b5 Lb5-a4 30. Ta4-a5 Ta5-a6 31. Da6-a7 La7-b6 32. Db6-a6 Ta6-a5 33. Ta5-a4 Da4-b3 34. Tb3-b4 Db4-a4 35. Ta4-a5 Da5-b4 36. Tb4-a4 La4-b5 37. Tb5-b4 Db4-a5 38. Da5-b6 Tb6-a6 39. Da6-a5 Da5-b4 40. Tb4-b3 Lb3-a4 41. Ta4-b4 Db4-a5 42. Da5-a6 Ta6-b6 43. Tb6-b5 Db5-b4 44. Db4-a5 Da5-b5 45. Tb5-b6 Db6-a5 46. Ta5-a4 Ta4-a3 47. Da3-b4 Tb4-a4 48. Ta4-a5 Da5-b6 49. Tb6-b5 Tb5-b4 50. Tb4-a4 La4-b3 51. Db3-a3 Ba3-a2! 52. Da2-b3 Lb3-a4 53. Ta4-b4 Db4-a5 54. Ta5-a4 a4-a3 55. Da3-a2 La2-b3 56. Db3-a3 Da3-b4 57. Db4-b3 Db3-a3 58. Da3-b4 Tb4-b5 59. Tb5-a5 a5-a4 60. Da4-a3 Da3-b3 61. Db3-a4 Da4-a3 62. Da3-b3 Tb3-b4 63. Tb4-b5 Db5-a4 64. Da4-a3 Ta3-b3 65. Tb3-b4 Db4-b5 66. Db5-a4 Ta4-a3 67. Ta3-b3 Lb3-a2 68. Ta2-a3 Ta3-a4 69. Da4-b5 Db5-b4 70. Db4-a4 Ta4-a3 71. Ta3-a2 La2-b3 72. Db3-b4 Tb4-a4 73. Da4-b3 Tb3-b4 74. Db4-a4 Da4-b5 75. Db5-b4 Tb4-b3 76. Tb3-a3 Da3-a4 77. Da4-b5 Tb5-b4 78. Db4-a4 Da4-a3 79. Ta3-b3 Lb3-a2 80. Ta2-a3 Da3-a4 81. Da4-b4 Db4-a3 82. Da3-a4 La4-b3 83. Db3-a3 Da3-b4 84. Db4-b3 Db3-a3 85. Ta3-a2 Da2-b3 86. Sb3-a1
play all play one stop play next play all
TRD schrieb damals (1922): "[This is] certainly the most glorious retro I have had the privilege of yet printing... This beautiful application of the well-known zig-zag puzzles to a retro study has played havoc with the solving list."
Keywords: 50 move rule, Last Moves? (96), Sliding block puzzle, Type A
Genre: Retro
FEN: KB6/QpN1p2p/r1pkP3/Rqp1p3/bRP5/brP5/pPP5/NB6
Reprints: 7373 Die Schwalbe 129 06/1991
Pat a Mat 19 04/1994
feenschach 137 08-09/2000
(A) feenschach 149 10-12/2002
A26 Length Records in Last Single Moves? , p. 6, 11/2009
T3 Phénix 265, p. 10463, 09/2016
III Phénix 282, p. 11076, 02/2018
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2018-08-25 more...
7 - P0000230
Alexander Kislyak
7375 Die Schwalbe 129 06/1991
N. Plaksin zum 60. Geburtstag gewidmet
5. ehrende Erwähnung
P0000230
(11+14)
Weiß nimmt einen Zug so zurück, daß die (entstehende) Stellung remis ist!
R: 1. Ta6xLa7 Tb7-b8 2. Kd8-e8 Lb8-a7 3. Ta7-a6 Sd6-c8 4. Ta6-a7 Sf5-d6 5. Ke8-d8 Sd4-f5 6. Kd8-e8 Sb3-d4 7. Ke8-d8 Da1-b1 8. Kd8-e8 Kb1-c1 9. Ke8-d8 Sc1-b3 10. Td1-d2 Lh3-f1 11. Tg1-d1 Sb3-c1 12. Tg5-g1+ Sd4-b3 13. Th5-g5 Se6-d4 14. Th8-h5 Sd8-e6 15. Tg8-h8 La7-b8 16. Th8-g8 Tb8-b7 17. Tg8-h8 Tc8-b8 18. Th8-g8 Lb8-a7 19. Ta7-a6 Kc1-b1 20. Tb7-a7 Ta6-a8 21. Tg8-h8 La7-b8 22. Th8-g8 Ta8-c8 23. Tb8-b7 Sc6-d8 24. Kd8-e8 Se5-c6+ 25. Kc8-d8 Kd1-c1 26. Kb7-c8 Ke1-d1 27. Td8-b8 Tc8-a8 28. Tg8-h8 Lb8-a7 29. Te8-d8 Ta8-a6 30. Ka6-b7 La7-b8+ 31. Kb5-a6 Lb8-a7 32. Ka4-b5 Ta6-a8 33. Kb3-a4 La7-b8 34. Kc3-b3 Ta8-c8 35. Tb8-e8 Kf1-e1 36. Tb7-b8 Td8-a8 37. Tb8-b7 Kg2-f1 38. Ta8-b8 Lb8-a7 39. Kd2-c3 Lf5-h3 40. Ta7-a8 Kh3-g2 41. ... Kh4-h3 42. ... Kg5-h4 43. ... Kf6-g5 44. ... Ke6-f6 45. ... Kd6-e6 46. ... Kc6-d6 47. Ta8-a7 Kb7-c6 48. Th8-g8 Kc8-b7 49. Ta7-a8 Dg1-a1 50. Tb7-a7 La7-b8 51. Th4-h8 0-0-0!
play all play one stop play next play all
Henrik Juel: My guess is -1.Ra6:B. (2003-06-02)
Mario Richter: Position after 1.Ra6:B looks illegal to me: How do you get the wK out of his prison? (2010-04-15)
Henrik Juel: My 2003 guess was probably a youthful attempt to provoke somebody to copy the tedious solution from Die Schwalbe, so far without success. (2010-04-16)
Mario Richter: Unfortunately I only have the issue of Die Schwalbe, in which the problem was published (so I can confirm, that the diagram is correct), but not the one with the solution.
Pleas notice, that the complete stipulation reads: "Weiß nimmt einen Zug so zurück, daß die (entstehende) Stellung remis ist!" (White retracts one move in such a way, that the (resulting) position is drawn!)
Judge D.Pronkin wrote in his award: "Es gibt viele Kompositionen, welche die 50-Züge-Regel benutzen, aber diese Aufgabe ist vielleicht die komplizierteste zum Lösen." (There are many compositions, which use the 50-moves-rule, but this one is perhaps the most complicated one to solve.) (2010-04-17)
Gerd Wilts: Solution added. Henrik's guess was correct, after all! (2010-04-17)
Brassaud: Je pense que la position est facilement obtenue avec :
R : 1)Tb7-a7, Fh3xCf1 2)Cg3-f1, Ta6-a8 3)Ce4-g3, Ta8-b8 4)Tb8-b7, Da1-b1 5)Cc5-e4, Rb1-c1 6)Cb3-c5, Ca7-c8 7)Cc3-b1, Cc6-a7 8)Td1-d2, Ce5-c6 9)Tg1-d1, Ff5-h3 10)Tg6-g1, Fe4-f5 11)Cb3-c1, Rc1-b1 12)Cc5-b3+, Rd1-c1 13)Rd8-e8, Re1-d1 14)Rc8-d8, Rf1-e1 15)Tc6-g6, Rg2-f1 16)Rb7-c8, Rh3-g2 17)Te8-b8, Td8-a8 18)Cb3-c5, Ta8-a6 19)Ra6-b7, Tb8-a8+ 20)Rb5-a6, Tb7-b8 21)Ra4-b5, Ta8-d8 22)Ra3-a4, Ta6-a8 23)Ta8-e8, Tb8-b7 24)Tc3-c6, Dg1-a1 25)Ca1-b3, Td8-b8 26)Cb3-a1, Rh4-h3 27)Ca1-b3, Rg5-h4 28)Cb3-a1, Rf6-g5 29)Ca1-b3, Re6-f6 30)Cb3-a1, Rd6-e6 31)Ca1-b3, Rc6-d6 32)Tb3-c3+, Rb7-c6 33)Tb4-b3, Rc8-b7 34)Ta7-a8+, O-O-O 35)Ta4-b4, Dg6-g1 36)Tb4-a4, Dc6-g6 37)Ta4-b4, Db7-c6 38)Tb4-a4, Db8-b7 39)Ta4-b4, Dd8-b8 40)Tb4-a4, Fb7-e4 41)Ta4-b4, Fc8-b7 42)Tb4-a4, b7-b6 … etc
La position est possible sans utiliser la règle des 50 coups. (2015-08-30)
A.Buchanan: Would appreciation clarification on how the 50M rule & convention apply here. (2015-08-31)
A.Buchanan: Specifically, in the prior position we are asked to find, doesn't the 50M rule trigger the end of the game, so we can't proceed to the diagram position? (2015-09-01)
Henrik Juel: The end of the game cannot be triggered before it has been established that 50.0 moves without captures, pawn moves, or castlings have been played (2015-09-01)
VL: In author's book "Po sledam shakhmatnykh figur" (Tracing Chess Pieces), Zaporozh'e, 1998, p.66-7, this problem is stipulated so: "W retracts his last move and demands to fix a draw" [to recognize, to declare]. Implicitly, more or less clear in Russian, 'demands' means 'justifiedly demands'. Indeed, at the end of the solution, in which the last move 51... O-O-O! is called critical, the author writes: "So, between castling and wRa6xBa7, 50 full moves without captures and P's advances were made. The demand of W is correct: a draw by Laws of Chess!" AK considers the 50-move rule as acting non-automatically, therefore -Ra6xBa7! is legal. (2015-09-12)
comment
Keywords: 50 move rule, Help retractor
Genre: Retro
FEN: rrn1Kb2/R1ppppp1/1p6/p7/8/3P1P2/PPPRPP1P/1qk2b2
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2011-11-02 more...
8 - P0000307
Thomas Volet
8130 Die Schwalbe 141 06/1993
P0000307
(12+14)
Ist die Stellung legal?
Die kürzeste Zugfolge bis zum letzten B-Zug sieht prinzipiell so aus ('...' = Wartezug):
R: 1. Ta8-b8 Kd1-c1 2. Kb8-c8 Ke2-d1 3. Lf8-g7 Lg7-h6 4. Lg8-h7 ... 5. Tb1-b2 ... 6. Th1-b1 ... 7. Th7-h1 Lh6-g7 8. Tg7-h7 ... 9. Lh7-g8 ... 10. Tg8-g7 ... 11. Lg7-f8 ... 12. Tc8-g8 ... 13. Lg8-h7 Td8-d7 14. Lh7-g8 Tg8-d8 15. Lf8-g7 Tg7-g8 16. Lg8-h7 Th7-g7 17. Te8-c8 Lg7-h6 18. Kc8-b8 Th1-h7 19. Lh7-g8 Lh6-g7 20. Lg7-f8 Tg1-h1 21. Tg8-e8 Tg4-g1 22. Lf8-g7 ... 23. Tg7-g8 24. Lg8-h7 25. Th7-g7 Lg7-h6 26. Th1-h7 Lh6-g7 27. Kd7-c8 ... 28. Lh7-g8 ... 29. Lg7-f8 ... 30. Tg8-a8 ... 31. Lf8-g7 ... 32. Tg7-g8 ... 33. Lg8-h7 ... 34. Th7-g7 Lg7-h6 35. Th3-h7 Th4-g4 36. ... Th7-h4 37. ... Lh6-g7 38. ... Tg7-h7 39. Lh7-g8 Tg8-g7 40. Lg7-f8 Ta8-g8 41. Lf8-g7 Lg7-h6 42. Lg8-h7 ... 43. Th7-h3 Lh6-g7 44. Tg7-h7 Ld3-c2 45. Lh7-g8 ... 46. Tg8-g7 ... 47. Lg7-f8 ... 48. Td8-g8 ... 49. Ke8-d7 ... 50. Kf8-e8 Lb5-d3 51. ... Ld7-b5 52. ... Lc8-d7 53. ... d7-d6!
play all play one stop play next play all
"Nach 'unserer' Ausdrucksweise ist die Stellung also illegal, weil nur unter Außer-acht-Lassung der 50-Züge-Regel erspielbar." (HHS)
"Schöne Rangierarbeit mit guter Ausnutzung der LL-Schleuse" (DB).
Auf derartige Forderungsfragen erwartet man ja i.a. ein JA als Antwort und so wäre eine Verkürzung der Zügezahl auf genau 50 Züge bis zum letzten B-Zug angebracht (und auch leicht zu bewerkstelligen). So vermutet jeder einen besonderen - aber nicht vorhandenen - Trick des Autors, um die 50-Züge-Beschränkung nicht zu überschreiten. Mehrere Löser kamen beim Rangieren offensichtlich so ins Schwitzen, daß sie gar nicht an die 50-Züge-Regel gedacht haben und so fälschlicherweise 'Legalität' behauptet haben! Ebenso falsch lagen einige Löser, die 'Illegalität' attestierten mit der Begründung sSh8 oder sLh6 seien nicht zu realisieren. 3/III und 5L., welche die Stellung aufgedröselt haben (von denen kam nur HHS zu der Erkenntnis: illegal!).
Brassaud: Je suis d’accord avec la solution proposée jusqu’à 53) Wartezug, d7-d6 et la partie est considérée comme nulle.
La position intermédiaire obtenue après 53) … , d7-d6 est la suivante :
T1ft1R1c/pppp/PPFF/4PtPf/3pppp1/8/1P6/P2pr3/7T
Cette position est-elle légale ? Je ne le crois pas. Les pions noirs ont pris 4 fois. Le pion h2 a donc été promu. Cette promotion peut être encore sur l’échiquier sous forme de T ou de F, ou bien a été prise mais c’est sans réelle importance. Pour dénouer cette position il faut d’abord reprendre d6xCe7 puis c5xDd6 afin de ramener ce pion en c2. A ce moment la tour blanche et les 2 fous de cases noires peuvent sortir mais le FB de g8 et le roi blanc sont encore dans la cage. Le pion de c2 a effectué les 2 seules prises de pièces noires. Les autres PB venus de e2,f2, g2 n’ont pas fait de prise et le pion de h2 a été promu en h8 sans prise. Il faut ensuite reprendre d6-d5 et e7xd6 (pièce quelconque)puis reprendre la promotion du pion en h8. Mais là je ne vois pas comment en raison du cavalier bloqué par les 2 pions blancs de f7 et g6. Le retour d’une pièce promue (dame ou tour ou même le fou de g7) en h8 ne peut se faire, donc on ne peut reprendre le retour de h7-h8 puis h6-h7 et h5-6 ni bien entendu reprendre h6xg5 pour tout dénouer.
Ainsi je pense que le problème en lui-même est illégal avant même de faire intervenir la règle des 50 coups. Pouvez-vous me dire si quelque chose m’aurait échappé ? (2015-09-11)
Thierry LE GLEUHER: Sorry but the position is legal. The retro play can continue with d6-d5 and d5xXe6, and unlock the rest is easy. (2015-09-13)
Brassaud: Merci pour votre aide. (2015-09-17)
Thomas Volet: TV: The composition's only point is the extension of the retroplay by the interaction of the 3 Bs.
I do not accept anyone's "codex" that purports to alter the rules of chess by making the draw automatic or that imports castling. Under the chess rules, a draw is at the option of the moving player whenever the sequence of non-P, non-capturing moves is sufficiently long (and has nothing to do with castling).
If interested in positions that involve the 50-move rule, please see P0008399 (75-move sequence with several rook circuits), P1202286 (where the "codex" automatic draw rule presents the situation in which either player on the move can make a move that is simultaneously a draw and a checkmate), or P1331867 (move preceding the sequence must have been a capture of a non-P by a non-P). (2019-01-02)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 1RK4n/ppprPPBB/3pPrPb/3pppp1/8/1P6/PRbP4/2k5
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2015-09-17 more...
9 - P0000544
Nikita M. Plaksin
Valery Liskovets

3459 Die Schwalbe 68 04/1981
2. Lob
P0000544
(13+11)
#1 vor 248
VRZ, Typ Proca
VL: Solution. Retro: 1.h4! a3 2.Ba2 B~ 51.Bb1 a4! (51...B~?? an
illegal draw by both the 50 moves and three time repetition rules)
52.Ba2 B~ 99.Bb1 a5! (99...B~?? a 3d repetition: b.B has only
12 squares to visit, 4*12=48) 100.Ba2 B~ 148.Ba2 Ba4!
149.Bb1 a6! (the 50 moves rule) 150.Ba2 Bb5 196.Ba2 Ba4!
197.Bb1 a7! (a 3d repetition otherwise) 198.Ba2 Bb5
246.Ba2 Bg4/Be4(d3,f5) 247.Bb1 h7*Qg6/h7*Sg6! (again 247...B~??
would be a draw by the 50 moves rule) 248.Qd3/Qg3/Ba2!
& Qd8#/Q*c7#/S*e7# (no dual).

(Retro: 1.h3? a3 and then B. will force W. to retro-move
h2-h3 in order to avoid an illegal 3d repetition.)

Genesis: b.Pd7*S(Q)c6, w.Pa2*b*c*d-d7*c(e)8B-a2, w.Pb2-b3,
w.Bc1-h8, w.Pf2*Pg-g7 and, finally, b.Ph7*Q(S)6. 13=1(Bf1)+2=16.
11+5=16. (2004-08-17)
VL: Justification.
B.Bishop can visit each square no more than twice on odd and
twice on even moves, otherwise a draw would stop the retro-game
by the 3 times repetition rule. Unless b.P occupies a4 or a6,
there are 13 squares accessible for B. 4*13=5250, so that generally
the 50 moves rule can act. However, B can visit a4 only visiting
b5 twice. Therefore excepting the start and finish moves, b.B can
visit a4 only twice! When b.P occupies a4 or a6, only 12 squares
are accessible for b.B, which provides 4*12=48 moves. There exists
a route of B starting at a4 in the cases when b.P stands on a6
or a7 and a route finishing at a4 in the cases with b.Pa5, a6 or
a7. Thus, when b.P occupies a3, the longest route of b.B avoiding
a 3d repetition contains exactly 50 moves. When P occupies a5,
the longest route of b.B contains 5150 moves; the same is valid
for P on a7 when B finishes 246...Bb4/Be4. The subtlest case is
with Pa6; here is a confirming 48-moves route:
0.a4! 1.b5 2.a4 3.b5 4.c4 5.d5 6.e6 7.f5 8.h3 9.g4 10.h5
11.f3 12.e4 13.d3; 14.f5 15.h3 16.g4 17.h5 18.f3 19.e4 20.d3;
21.c4 22.d5 23.e6; 24.f5 25.h3 26.g4 27.h5 28.f3 29.e4 30.d3;
31.c4 32.d5 33.e6; 34.c4 35.d5 36.e6; 37.f5 38.h3 39.g4 40.h5
41.f3 42.e4 43.d3; 44.b5 45.a4 46.b5 47.a4 (2004-08-17)
comment
Keywords: 50 move rule, Draw by repetition, Defensive Retractor, Type Proca
Genre: Retro
FEN: Nrk1KRrB/1pp1pRP1/2p2pp1/8/4b2P/1P6/p1PPP1P1/1B6
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-28 more...
10 - P0000566
Andrey Frolkin
3606 Die Schwalbe 70 08/1981
P0000566
(13+14)
Wer ist am Zug?
Keywords: 50 move rule, Non-standard material, Promotion, Sliding block puzzle, Whose move?
Genre: Retro
FEN: Q1qNbRRR/KpkPb1RR/2pprrrR/4pppp/8/8/2PP1P2/8
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-10 more...
11 - P0000592
Ralf Beinhorn
3811 Die Schwalbe 73 02/1982
P0000592
(3+2) cooked
#3
Stellung nach dem 5798. Zug von Schwarz
1. Th8? Kc8 2. Ta7? (game over now!) Kb8 (Kd8) 3. Txg8#
1. Ta8+! Kxa8 2. Th8 Kb8 3. Txg8#
play all play one stop play next play all
Number should be 5747 rather than 5798. Then problem works out very nicely. Note that the overall longest possible game in chess is 5898.5 moves.
Keywords: 50 move rule, Aristocrat
Genre: Retro, 3#
FEN: 1k4b1/8/RK6/8/8/8/8/7R
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2018-12-19 more...
12 - P0000594
Valery Liskovets
Nikita M. Plaksin

3870 Die Schwalbe 74 04/1982
P0000594
(10+10)
#150 (AP)
I 1. Re4+ Kd8 2. Kxf8 - 3. Re8#
II (AP-justification of Bl's turn to move) 0. ... Bxg4! 1. c4! 2. c5
(threatening c5-c6) 2. ... Bf3 (B must guard c6, b7 or d7!) 3. Kh6 B-
49. Kh6 Ba4 50. Kg7 a5! (the only possibility. 50. ... B-?? would be a draw by a 3d repetition: only 12 squares are accessible for bl B. 4x12=48!) 51. Kh6 Bb5 99. Kh6 Ba6! 100. Kg7 a4! (100. ... B-?? an illegal draw before castling by the 50 moves rule: now B can visit 13 squares including a6; 4x13=52>50) 101. Kh6 Bb5 147. Kh6 Ba6! 148. Kg7 Bc4 (148. ... Bb5?? a draw by a 3d repetition: again only 12 squares were accessible, so that B wust now move to a new square) 149. c6! 0-0-0! (the whole line has been finally legalized) 150. a8Q#

NOT:
1. Kh6? B- 50. Kg7 a5 (50 moves!) 100. Kg7 a4 150. Kg7 0-0-0!
B can visit each appropriate square no more than twice on odd and twice on even moves, otherwise a draw would stop the game by the 3 times repetition rule before Bl managed to castle.
Here are confirming routes of B:
(Pa6; 48 moves) 1-36: g4-h3-f5-e6-d5-e4-g2-h1-f3 four times
37-48: c6-b5-a4 four times
(Pa5; 49 moves) 1. b5 2. a6 3. b5 4. a4 5. c6 6. a4 7. c6 8-43: f3-g4-h3-f5-e6-d5-e4-g2-h1 four times 44. c6 45. a4 46. c6 47. a4 48. b5 49. a6! (50. b5)
(Pa4, 48 moves) 1. a6 2. b5 3. a6! 4. b5 5-24: c6-f3-g4-h3-f5-e6-d5-e4-g2-h1 two times 25-44: 3-g4-h3-f5-e6-d5-e4-g2-h1-c6 two times 45. b5 46. a6 47. b5 48. a6!
AP after Keym.
play all play one stop play next play all
Denis Chassain: Maybe White may try a3-a4 when the bishop is on a6? It seems the bishop then has no "good" square and c5-c6 follows. (2003-01-15)
Valery Liskovets: By Denis Chassain's remark, the stipulation should
be shortened by 2. It is worse, however, that now
the solution does not depend on the 50-moves rule.

Here is a correction that preserves the initial intention:

Transpose WPa3 to h2, WPb6 to b5, WPc3 to c4 and BPa6 to h4.
#101 AP (pRA)

Remark. Starting at the "appendix" a6
one can create an appropriate route of 50 or more moves. (2003-04-16)
VL: AP-solution of the revised version: castling legalizes
Black's turn to move.
(A) After 0... B*g4! 1.b6 Be2 2.c5!, bB must guard c6, b7 or d7, thus it can visit 13 squares including h3 and the "appendix" a6; 4*1350.
(B) Here is a 50-move route of the bishop, where dashes mark the second visits of squares on odd/even moves (we drop moves wKh6/Kg7): 2.b5(1) 3.a6 4.b5- 5.a4 6.c6 7.a4- 8.c6- 9.h1 10.g2 11.f3 12.g4 13.f5 14.e6 15.h3 16.d5 17.e4
18.h1 ... 26.e4 27.h1- ... 35.e4- 36.h1- ... 44.e4- 45.c6 46.a4 47.c6- 48.a4- 49.b5 50.a6!(49) (and further 51.b5??, or, in order to finish at a6, B could play 2... Ba6(1) 3... Bb5 ibid. 51.a6??(50) - both are illegal only due to
premature draws by the 50-move rule!). Now, after 51.Kh6 B plays 51... h3! 52.Kg7. After this only 12 squares are accessible, 4x12=48. (C) Here is a 48-move route of bB
starting at a6(1): 52.b5(2) 53.a6- 54.b5- 55.a4 56.c6
57.a4- 58.c6- 59.h1 60.g2 61.f3 62.e4 63.f5 64.g4 65.e6
66.d5 67.h1- 68.g2- ... 74.d5- 75.g2 ... 81.d5 82.h1
83.g2- ... 89.d5- 90.h1- 91.c6 92.a4 93.c6- 94.a4- 95.b5 96.a6 97.b5- 98.a6!(48)-. Now 99.Kh6 Bb5?? would be an illegal (before castling) third repetition. So B must go to a new square: 99... c4(d3/e2/f1) 100.c6! 0-0-0 (forced) 101.a8Q# (2003-04-28)
comment
Keywords: 50 move rule, a posteriori (AP), Castling (sg)
Genre: Retro, n#
FEN: r3kr1n/Pp1p1pKP/pP1P1Pp1/6Pb/6R1/P1P5/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-10-03 more...
13 - P0000743
Bernd Schwarzkopf
2985 Die Schwalbe 60 12/1979
P0000743
(1+1)
Wie war die Stellung vor 11897 Einzelzügen?
Partieanfangsstellung.
play all play one stop play next play all

Duplicate Diagram: P0007610, P1258834

Mu-Tsun Tsai: Is there really anything special about this number "11897"? (2011-05-21)
Mario Richter: 11897 is the length (in single moves) of the longest possible legal game, if the 50-moves-rule is applied (but not the rule of insufficient material). This number was determined by Karl Fabel, see e.g. the book "Schach und Zahl". (2011-05-21)
comment
Keywords: only Kings, 50 move rule
Genre: Retro
FEN: K7/8/8/8/8/8/8/7k
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2013-01-18 more...
14 - P0000875
Nikita M. Plaksin
500 Die Schwalbe 10 08/1971
Dr. K. Fabel gewidmet
1.-2. Preis
P0000875
(15+14)
#3
Keywords: 50 move rule
Genre: Retro
FEN: 1b1K3n/2pppprp/1p4p1/1p6/b1P2B2/RP2P1R1/r1PPQPPP/NB5k
Reprints: feenschach 30 10/1975
feenschach 38 04-06/1977
618 FIDE Album 1971-1973 1978
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 1996-08-19 more...
15 - P0000913
Nikita M. Plaksin
850 Die Schwalbe 17 11/1972
P0000913
(13+14)
#3
1. Dxd4! Tg8+ 2. Kxg8 Sxc2 3. Dc4#

Beispielauflösung:
R: 1. ... Ta5-a6 2. Dc3-b2 Ta6-a5 3. Dh3-c3 Ta5-a6 4. Ke8-f8 Ta6-a5 5. Kd8-e8 Ta5-a6 6. Kc8-d8 Ta6-a5 7. Kb7-c8 Tg8-g7 8. Dh6-h3 Th8-g8 9. Df8-h6 Ta5-a6 10. Dg8-f8 Ta6-a5 11. Kc8-b7 Ta5-a6 12. Kd8-c8 Ta6-a5 13. Ke8-d8 Ta5-a6 14. Kf8-e8 Ta6-a5 15. Kg7-f8 Ta5-a6 16. Kh6-g7 Ta6-a5 17. Kg5-h6 Ta5-a6 18. Kf4-g5 Ta6-a5 19. La2-b1 Ta5-a6 20. Tb1-d1 Ta6-a5 21. Tb2-b1 Ta5-a6 22. Lb1-a2 Ta6-a5 23. Ta2-b2 Ta5-a6 24. Ta3-a2 Ta6-a5 25. La2-b1 Ta5-a6 26. Tb1-f1 Kf1-e2 27. Tb2-b1 Kg1-f1 28. Kf3-f4 Ta6-a5 29. Ke2-f3 Kh1-g1 30. Kf1-e2 Ta5-a6 31. Tb1-b2 Ta6-a5 32. Te1-b1 Ta5-a6 33. Te6-e1 Ta6-a5 34. Lb1-a2 Ta5-a6 35. Ta2-a3 Ta6-a5 36. Tb2-a2 Ta5-a6 37. La2-b1 Ta6-a5 38. Tb1-b2 Ta5-a6 39. Te1-b1 Ta6-a5 40. Te5-e1 Ta5-a6 41. Ke2-f1 Kg1-h1 42. Kd3-e2 Kf1-g1 43. Ke4-d3 Ke1-f1 44. Dg7-g8 Kd1-e1 45. Kf3-e4 Kc1-d1 46. Te2-e5 Kb2-c1 47. Te1-e2 Ka3-b2 48. Th1-e1 Kb4-a3 49. Te1-e6 Kc5-b4 50. Tb1-e1 Kd6-c5 51. b4-b5
play all play one stop play next play all
vgl. P0000875
hans: Is diagram correct? 3 black captures, so also a white promoted pawn, but a- or e-pawn is 3 captures, (exfxg, axb or exdxcxb) (2013-02-13)
Henrik Juel: The diagram may be correct.
The pawn position can be explained without promotions:
White captured axb and exd; Black captured a7xSb6xSc5xPd3 (2013-02-13)
Mario Richter: Typo in Henrik's comment, it should read "Black captured a7xSb6xSc5xPd4". The main point of the problem seems to be that exactly this capture Pc5xPd4 can only be retracted after bK has escaped to d6/d5. The main plan therefore is:
1. free the wK (via h6)
2. bring wRR to a3+b2
3. bring bK to h1, wK to f1
4. let wRR out via e-file
5. bring bK to d6
6. retract Pc5xPd4 (2013-02-13)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 1B3K2/b1pppprp/rp4p1/1P6/b2p4/1P6/1QPPkPPP/nB1R1R2
Reprints: (B) Die Schwalbe 27 06/1974
(D5) feenschach 27 04/1975
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2013-02-13 more...
16 - P0001110
Michel Caillaud
3396 Die Schwalbe 67 02/1981
4. Preis
P0001110
(14+12)
Wieviele Züge sind seit dem letzten Bauernzug mindestens geschehen?
Renny Bosch: I believe the minimum number of moves since the last pawn move is 68, based on the following PG (or SPG?): 1. g4 Nc6 2. Bg2 Na5 3. Bc6 Nb3 4. axb3 Nf6 5. Nc3 Ne4 6. Nd5 Nc3 7. dxc3 Rg8 8. Qd4 Rh8 9. Qb6 axb6 10. Be3 Rg8 11. Bc5 Rh8 12. Bb4 Rg8 13. Ra5 Rh8 14. Rc5 bxc5 15. Ba5 Rg8 16. Bb6 Rh8 17. Ba7 Rg8 18. Bb8 Rh8 19. Ba4 Ra6 20. Kd2 Re6 21. Kd3 Re5 22. Kc4 Re4+ 23. Kb5 Rc4 24. bxc4 Rg8 25. Bb3 Rh8 26. Nh3 Rg8 27. Ra1 Rh8 28. Ra7 Rg8 29. Nb6 Rh8 30. Na8 Rg8 31. Nf4 Rh8 32. Nd5 Rg8 33. Ndb6 h6 34. Na4 b6 35. Ba2 Bb7 36. Bb1 Be4 37. g5 Bh7 38. g6 Rh8 39. gxh7 { the last pawn move } g6 40. Rb7 Bg7 { move bB, bK, bQ out of row 8 } 41. Ba7 Be5 42. Rb8 Kf8 43. Ka6 Kg7 44. Kb7 Qg8 45. Rf8 Kf6 46. Kc8 { allow bR to pass wK } Qg7 47. Rg8 Ke6 48. Kd8 Qf6 49. Ke8 Qf5 50. Kf8 Bf4 51. Kg7 Qg5 { reverse order of the two rooks }52. Rb8 Rc8 53. Rb7 Rd8 54. Bb8 Rc8 55. Ra7 Rd8 56. Ra5 Rc8 57. Ba7 Rb8 58. Rb5 Rb7 59. Bb8 Ra7 60. Rb3 Ra5 61. Ra3 Rb5 62. Ra1 Rb3 63. Ba2 Ra3 64. Bb3 Ra2 65. Rd1 Ra1 66. Rd2 Re1 67. Rd1 Rf1 68. Ra1 Rb1 69. Ra3 Rc1 70. Ba2 Ra1 71. Bb1 Ra2 72. Rb3 Ra3 73. Rb5 Rb3 74. Ra5 Ra3 75. Ra7 Rb3 76. Rb7 Ra3 77. Ba7 Rb3 78. Rb8 Ra3 79. Rh8 Qf6+ 80. Kf8 { move bK past wR } Qg7+ 81. Ke8 Kf6 82. Kd8 Be5 83. Kc8 Qg8+ 84. Kb7 Kg7 85. Ka6 Kf8 86. Kb5 Ke8 87. f3 Kd8 88. Ba2 Kc8 89. Bb1 Kb7 90. Ba2 Qg7 91. Rg8 Qf6 92. Bb1 Qe6 93. Ba2 Bh8 94. Rg7 { put wR into pocket, and final cleanup } Kc8 95. Ka6 Kd8 96. Kb7 Ke8 97. Kc8 Kf8 98. Kd8 Rb3 99. Bb1 Rb5 100. Ba2 Ra5 101. Bb8 Ra7 102. Bb1 Rb7 103. Ba7 Qc6 104. Ba2 Qb5 105. Bb1 Qb4 106. Ba2 Qa3 107. Rg8# (2007-04-24)
Michel Caillaud: the exact stipulation ends "mindestens geschehen".
(in english : "minimum number of moves since the last Pawn move?").
the last Pawn move is f2-f3,that must be interposed before g7-g6 as otherwise the 50-moves rule would have been violated.
the answer is a minimum of 15,0 moves with a retro-play running as :
-1.Tg7-g8# ...-16.f2-f3! ... -65...g7-g6
with 49,5 moves between g7-g6 and f2-f3 the 50-moves rule has been respected (2007-09-12)
Michel Caillaud: more detail on intended retro-play :
-1.Tg7-g8# … -4…De6-c6 … -8…Tb3-b5 -9.Kb5-a6 Ta3-b3+ -10.La7-b8 … -13…Kb7-c8 -14.Tg8-g7 Ld4-h8
-15.Tf8-g8 Df6-e6 -16.f2-f3! Dg7-f6 -17.Th8-f8 Dg8-g7 -18.Lb1-a2 Ta1-a3 -19.La2-b1 … -24… Kf6-g7 -25.Kb7-a6 Dg7-g8 -26.Tb8-h8 Ke5-f6 -27.Kc8-b7 … -28… Dh4-f6 -29.Ke8-d8 … -35… Td2-d1 -36.Ta3-b3 … -37.Lb3-a2 … -39.Th1-a1 Td1-d2 -40… Ta1-d1 -41.Kg7-f8 Ta3-a1 -42.La2-b3 …-48… Th8-b8 -52.Tb7-a7 … -53.La7-b8 … -55.Tg8-b8 … -59.Kç8-d8 Kf6-e5 -60.Kb7-ç8 Kg7-f8 -61.Tb8-g8+ Kf8-g7 -62.Kc8-b7+ Ke8-f8 -63.Tb7-b8 Lg7-d4 -64.Lb8-a7 Lf8-g7 -65.Ta7-b7 g7-g6 (2007-09-18)
Henrik Juel: After -1.Tg7-g8# the main parts of the resolution are
(s/w mean black/white)
sDa3 out, sTb7 to a3, wKe8 to b5, sKf8 to b7, wTg7 to h8 and sLh8 to d4, sD to g8, sKb7 via g7 to e5, sDg8 out, wKb5 to g7, sTa3 to d2, wTh8 to e1, sTd2 to h8, wTe1 to g8,
(the rooks have switched place)
wKg7 to b7, wTg8 to b8, wKb7 to c8, sKe5 to e8, sLd4 to f8,
-65... g7-g6 -66.g6xLh7
(so -16.f2 was needed to avoid draw by the 50 moves rule)
wTb8 to h1, wKc8 to b5, sD to d8, sLh7 to c8,
-88... b7-b6
wSa8 out, wLa7 to a5,
-99... b6xTc5
wTc5 to a1, wLa5 to c1,
-111.d2xTc3
sTc3 to a8 and wSa4 to b1, wLa2 to a4
-222.b3xSc4 a7xDb6 -223.a2xSb3 (2018-12-05)
Henrik Juel: It is difficult to avoid typos in such a mess
in line 3, wKd8 to b5, not e8
Michel also seems to have made some typos:
49.0 moves between -16.f2 and -65... g7, not 49.5
-25... Kf6, not 24 (may have implications for the solution) (2018-12-05)
more ...
comment
Keywords: 50 move rule
Genre: Retro
FEN: N2K1kRb/Brpppp1P/1p4pp/2p5/N1P5/q1P2P2/BPP1P2P/8
Input: Gerd Wilts, 1995-06-03
Last update: hpr, 2008-08-26 more...
17 - P0001176
Leon Loewenton
49 Europe Echecs 30 02/1961
P0001176
(15+12)
#3
AV: Rd3,De6,Ta1,g2,Fg8,Cc7,h8,Pa2,b2,b3,d2,e2,f2,g3,h4(15)/Rb4,Ta8,h3,Fc3,c8,Pa7,b7,c2,d7,e7,f7,g6,h2(13)

1.bxc3+ Ra3 2.Cb5+ Rb2 3.Ca3 Tb8 4.Cb1 Rc1 5.Rc4 Rd1 6.Rb4 Re1 7.Ra3 Rf1 8.Rb2 Re1 9.Rc1 Rf1 10.Ca3 Re1 11.Cc4 Rf1 12.Cb2 Re1 13.Cd1 Rf1 14.Rb2 Re1 15.Ra3 Rf1 16.Tb1 Re1 17.Tb2 Rf1 18.Ce3+ Re1 19.Cc4 Rd1 20.Ce5 Rc1 21.Cf3 Rd1 22.Ce1 Rc1 23.Tg1 Rd1 24.Th1 Rc1 25.Rb4 Rd1 26.Rc4 Rc1 27.Rd4 Rd1 28.Re3 Rc1 29.Rf3 Rd1 30.Rg2 Rc1 31.Rf1 Rd1 32.Cf3 Rc1 33.Cg1 Rd1 34.Rg2 Re1 35.Rf3 Rf1 36.Rf4 Rg2 37.Cf3 Ta8 38.Tc1 Tb8 39.Tbb1 Ta8 40.Ce5 Tb8 41.Cc4 Ta8 42.Cb2 Tb8 43.Cd1 Ta8 44.Dc4 Rh1 45.Rg5 Rg1 46.Rh6 Rh1 47.Rg7 Rg1 48.Rf8 Rf1 49.Re8 Rg1 diagramme, et 3# par 50.Ce3+! [50.Cb2+? Rg2!! nulle par la règle des 50 coups;
50.Df4? Tb8! (50...cxb1D!) ] 50...Rxf2 51.Tf1+ Rxg3 52.Dg4# [52.Df4#;
52.Tf3#] (2005-05-29)
AV: More exactly 50 Sb2+? Kg2! 51 De4+ is a draw (50-moves rule). Nor 50 Df4? cxb1D! and no mate. (2015-01-01)
more ...
comment
Keywords: 50 move rule
Genre: Retro
FEN: r1b1K1BN/pp1ppp2/6p1/8/2Q4P/1PP3Pr/P1pPPP1p/1RRN2k1
Reprints: 551 FIDE Album 1959-1961 1966
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2009-03-14 more...
18 - P0001187
Julio Sunyer
Problemas 1958
P0001187
(14+10)
Remis, Schwarz am Zug
Henrik Juel: 1... Ke1! and draw because the previous 49.5 moves included no captures or P moves: -1.Kg8 Ke1 ... -11.Ke3 Ke1 -12.Db5! Kf1 -13.Ta4 Kg1 -14.La3 Kg2! -15.Tb2 Kh1 -16.Tb1 Kg2 -17.Sf3 Kh1 -18.Sg1 Kg2 -19.Lb2-c1 Kh1 -20.Tf1 Kg2 -21.Lc1 Lb2 -22.Sf3 La1 -23.Th1 Lb2 -24.Sg1 Kf1 -25.Kf3 Ke1 -26.Kg2 Kd1 -27.Kf1 La1 -28.Sf3 Lb2 -29.Tg1 La1 -30.Tg5 Lb2 -31.Sg1 La1 -32.Kg2 Ke1 -33.Kg3 Kf1 -34.Kg4 Kg2 -35.Lb2-a3 Kh1 -36.Ta2 Kg2 -37.La3 Kh1 -38.Tb2 Kg2 -39.Tb1 Kh1 -40.Lb2-c1 Kg2 -41.Tf1 Kh1 -42.Lc1 Kg2 -43.Sf3 Lb2 -44.Th1 La1 -45.Sg1 Kf1 -46.Kg3 Ke1 -47.Kg2 Kd1 -48.Kf1 Lb2 -49.Sf3 La1 -50.Lb2-a3 L=a2 (this is the fastest we can reach a legal P retraction, I believe) -51.Tg1-h1 a3 -52.Tg4-g1 a4 -53.Kg2 Ke1 -54.Se5 Kd1 -55.Sc4 Ke1 -56.La1 Kd1 -57.La3 Kc1 -58.Sb2 Kb1 -59.Sc4 Ka2 -60.Lc1 Ka3 -61.Sb2 Ka2 -62.Kf3 Ka3 -63.a2xLb3 Ld5 -64.Tg1 Lb7 -65.Th1 Lc8 -66.Tg1-g5 b7 -67.Kg2 Ld8 -68.Dc4 a5 -69.Dd3 Ka4 -70.Sc4 Kb5 -71.b3, unpromote a wL on f8 etc. The problem originally appeared as New Year's greeting 1930 and was probably composed along with the similar P0001856 (2004-03-05)
Alfred Pfeiffer: Quelle: "Die Schwalbe" 29, 05/1930, S.425;
Untertitel: "Prost Neujahr!"
Vollständige Forderung (Teile a-c) in P1012862. (2011-02-09)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 8/3p2pK/1p1p2p1/b7/QP1N4/RPP4P/RBpPPP1p/b1Bk4
Reprints: 60 Europe Echecs 36 08/1961
(3) Die Schwalbe 67 02/1981
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2018-06-12 more...
19 - P0001199
Leon Loewenton
72v Europe Echecs 41 01/1962
P0001199
(15+14)
#4
AV: pas de 4# ici, mais dans la position-miroir
1.d3 Cf6 2.Fg5 Ch5 3.Cf3 Cg3 4.Tg1 Ch1 5.Ca3 h5 6.Fh4 Th6 7.Rd2 Tg6 8.Re3 Tg3 9.hxg3 Cc6 10.Dd2 Cd4 11.Da5 Ce6 12.Cd4 Cf4 13.gxf4 Tb8 14.Fg3 Ta8 15.Fh2 Tb8 16.g3 Ta8 17.Fg2 Tb8 18.Fc6 Ta8 19.Tg2 Tb8 20.Fg1 Ta8 21.Th2 Tb8 22.Th4 Ta8 23.Tg4 Tb8 24.Tg6 Ta8 25.Th6 Tb8 26.Th8 bxc6 27.Fh2 Fa6 28.Tg1 Tb5 29.Tg2 Db8 30.Fg1 Rd8 31.Th2 Rc8 32.Th4 Rb7 33.Da4 Rb6 34.Da5+ Rc5 35.Tg4 Rd6 36.Cf3 Re6 37.Tg6+ Rf5 38.Tgh6 Rg4 39.Tg6+ Tg5 [39...Rh3 40.Thh6 Tg5] 40.Thh6 Rh3 41.Cd4 Tg4 42.Cc4 Th4 43.Tg4 Rg2 44.Thg6 Th2 45.Th4 Rf1 46.Tgg4 Tg2 47.Fh2 Tg1 48.Rf3 Db4! 49.Th3 Re1 50.Tgh4 Tf1 51.Fg1 Rd1 52.Th2 Dd2 53.Tg2 Dc1 54.Fh2 Da1 55.Tg1 Rc1 56.Cb3+ Rb1 57.Ce3 Tc1 58.Td1 Fb5 59.De1 Fa6 60.Rg2 Fb5 61.Rf1 Fa6 62.Fg1 Fb7 63.Th2 Fc8 64.Tg2 Fb7 65.Fh2 Fc8 66.Rg1 Fb7 67.Df1 Fc8 68.Te1 Td1 69.Cc1 Td2 70.Cd1 Fb7 71.Cb3 Fc8 72.Ca5 Rc1 73.Cc4 Db1 74.Cb6 Fa6 75.Cd5 Fb7 (diagramme) 76.C1c3+ Les Noirs annoncent leur intention de jouer 76...Td1!! et réclament la nulle (50 coups). Mais dans la position-miroir (RBb1, DBc1, CBe5 ...), le mat est valide, car le RN a eu un coup de moins à jouer ! 77.Txd1+ Rxc2 [77...Rxb2 78.Txb1+] 78.Txb1 Cxf2 79.Dc1# 1-0 (2005-05-29)
Alfred Pfeiffer: Bildet zusammen mit P0001200 einen Spiegelzwilling. (2013-07-04)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 5b2/pbppppp1/2p5/3N3p/5P2/3P2P1/PPPrPPRB/1qkNRQKn
Reprints: R6 ASymmetrie 2013
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2013-07-04 more...
20 - P0001200
Leon Loewenton
73v Europe Echecs 41 01/1962
P0001200
(15+14)
#4
Mario Richter: Thank you,Gerd! My attempt to solve this problem:
Start with 2bqkbr1/Rppppppp/5B2/p7/2P2N2/1P1KP2N/BRPPQPPP/n7
(w: Ra7 Bf6 Pc4 Nf4 Pb3 Kd3 Pe3 Nh3 Ba2 Rb2 Pc2 Pd2 Qe2 Pf2 Pg2 Ph2
b: Bc8 Qd8 Ke8 Bf8 Rg8 Pb7 Pc7 Pd7 Pe7 Pf7 Pg7 Ph7 Pa5 Na1)
0...gxf6 1.Bb1 Bh6 2.Ra2 Kf8 3.Ra4 Rg5 4.Rb4 Kg7 5.Rb6 Rb5 6.Nh5+ Kg6 7.Rd6 Kf5 8.Rd4 Ke5 9.Re4+ Kd6 10.Qg4 Kc5 11.Ke2 Kb4 12.Ra6 Ka3 13.Rb6 Kb2 14.N3f4 Kc1 15.Kf3 Kd1 16.Re5 Rb4 17.Reb5 Ra4 18.Rb4 Ra2 19.Ra4 Rb2 20.Ba2 Rb1 21.Rbb4 Rc1 22.Bb1 Ke1 23.Ra2 Qg8 24.Rba4 Qg6 25.Rb2 Qd3 26.Ba2 Qf1 27.Rb1 Qh1 28.Nd3+ Kf1 29.Ng3+ Kg1 30.Ke2 Rf1 31.Re1 Bf4 32.Bb1 Bh6 33.Ra2 Bf4 34.Rb2 Bh6 35.Ba2 Bf4 36.Kd1 Bg5 37.Kc1 Bf4 38.Kb1 Bg5 39.Qd1 Bf4 40.Qc1 Bg5 41.Rd1 Re1 42.Nf1 Re2 43.Ne1 Bf4 44.Ng3 Bg5 45.Nh5 Bh6 46.Nf4 Bg7 47.Ng6 Kf1 48.Ne5 Qg1 and the diagram position is reached.
Then 49.Ne1-f3+ Re1 (best defense) 50.Rxe1+ ~ 51.Rxg1 and mate in the next move. (2010-02-27)
Olaf Jenkner: Die 50-Züge-Regel wirkt doch gar nicht, da Weiß in der Lösung ohnehin im 50-sten Zug schlagen muß. Ich hätte eine vermeintliche Nebenlösung erwartet, bei der nicht rechtzeitig geschlagen wird. (2010-02-27)
Olaf Jenkner: Im Zusammenhang mit der gespiegelten Position P0001199 ergibt die Lösung einen Sinn. (2010-05-09)
more ...
comment
Keywords: 50 move rule
Genre: Retro
FEN: 2b5/1pppppbp/5p2/p3N3/2P5/1P2P3/BRPPrPPP/nKQRNkq1
Reprints: R6 ASymmetrie 2013
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2013-07-04 more...
21 - P0001382
Nikita M. Plaksin
256 Europe Echecs 157 01/1972
P0001382
(14+13)
=
hans: Start from following position: Kb2, Rc6, Ba2, Bb8, Na1, Na8, b3, c2, d2, d6, e2, f2, g3, h2, - Kd1, Qg6, Rh4, Rh8, Bc8, b7, c7, c5, d7, e6, f7, g7, h7,
1. ... b6 2. Ba7 Ba6 3. Bb1 Bd3 4. Ba2 Be4 5. Ka3 Rb8 6. Ka4 Rb7 7. Bb8
Ra7+ 8. Kb5 Kc1 9. Bb1 Ra2 10. Ba7 Kb2 11. Bb8 Ka3 12. Ka6 Kb4+ 13. Kb7 Kb5
14. Kc8 Ka6 15. Kd8 Kb7 16. Ke8 Kc8 17. Kf8 Kd8 18. Kg8 Ke8 19. Kh8 Ra7 20.
Ba2 Rb7 21. Ba7 Rb8 22. Bb1 Kf8 23. Ba2 Re8 24. Bb1 Re7 25. Ba2 Ke8 26. Bb1
Kd8 27. Ba2 Kc8 28. Bb1 Kb7 29. Ba2 Ka6 30. Bb1 Kb5 31. Ba2 Kb4 32. Bb1 Ka3
33. Ba2 Bd3 34. Bb1 Ba6 35. Ba2 Bc8 36. Bb1 Ra4 37. Bb8 Ra7 38. Ba2 Rb7 39.
Ba7 Rb8 40. Bb1 Qd3 41. Ba2 Qa6 42. Bb1 Qb7 43. Ba2 Kb2 44. Bb1 Kc1 45. Ba2
Kd1 46. Bb1 Ke1 47. Ba2 Kf1 48. Bb1 Kg2 49. Ba2 Kh3 50. Bb1 Kg4 51. Ba2 Kf5
52. Bb1 Ke5 53. Ba2 Kd5 54. Bb1 Re8+ {50 moves rule} 1/2-1/2 (2010-06-25)
comment
Keywords: 50 move rule
Genre: Retro
FEN: Nrb1r2K/Bqpp1ppp/1pRPp3/2pk4/8/1P4P1/2PPPP1P/NB6
Input: Gerd Wilts, 1995-06-03
22 - P0001387
Nikita M. Plaksin
261v Europe Echecs 160 04/1972
P0001387
(12+14)
=, Weiß am Zug
AV: Le Roi noir doit se trouver en b2 (au lieu de b1).
Position de départ : Rd3, Th1, Fc1, Ca1, Pb2, c2, c4, d2, e3, f2, g2, h2 (12) /Rb4, Tb1 et h8, Fa2, a6 et f8, Ca5, Pa4, b7, c6, c7, e7, f7, et h7 (14).
1.b3 (dernier coup de pion) Tg8 2.Fb2 Tf1 3.Fg7 Ra3 4.Fh6 Rb2 5.Tg1 Rc1 6.Rc3 Rd1 7.Fg5 Re2 8.Fh6 Tb1 9.Fg5 Tb2 10.Fh6 Fb1 11.Fg5 Ta2 12.Ff6 Ta3 13.Rb2 Fa2 14.Tb1 Th8 15.Rc1 Rf1 16.Rd1 Rg1 17.Re1 Rh1 18.Rf1 Tg8 19.Te1 Fb1 20.Te2 Th8 21.Re1 Rg1 22.Rd1 Fg7 23.Rc1 Tf8 24.Rb2 Ta2+ 25.Rc3 Tb2 26.Rd3 Fa2 27.Fg5 Tb1 28.Fh6 Tf1 29.Te1 Tg8 30.Tb1 Tc1! (Fc3?) 31.Tb2 Fb1! 32.Ta2 Rf1 33.Ta3 Fa2 34.Fg5 Tb1 35.Ff4 Re1 36.Fg5 Rd1 37.Ff4 Rc1 38.Re2 Fb2! 39.Rf1 Rd1 40.Rg1 Re1 41.Rh1 Rf1 42.Fg5 Te1 43.Ff6 Te2 44.Fe5 Re1 45.Rg1 Rd1 46.Ff6 Rc1 47.Fe5 Rb1 48.Ff6 Fc1 49.Fh8 Tg7 50.Rf1 Rb2 et les Blancs font nulle par : 51.Rg1!! seul coup (2005-06-03)
comment
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: 7B/1pp1pprp/b1p5/n7/p1P5/RP2P3/b1PPrPPP/Nkb2K2
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-10 more...
23 - P0001403
Nikita M. Plaksin
277 Europe Echecs 177-178 10/1973
Lob
P0001403
(16+14)
Darf Weiß oder Schwarz in einem Zug mattsetzen?
AV: No, White draws with his last move (Th2-g2).

Kg6, De5, Td2 & f8, Ld4 & f1, Sf7 & h1, Ba2, b2, c2, d3, e2, f2, f4 & g2 (16) / Kg4, Dg8, Tg1 & h3, Le8 & h2, Sh5, Ba7, b6, c7, d7, e6, f6 & g7 (14).

1.g3 Last pawn move. 1...Th4 2.Lg2 Tb1 3.Le4 Lg1 4.Td1 Th2 5.Tc1 Tg2 6.Ld5 Lh2 7.Le4 Tg1 8.Ld5 Td1 9.Le4 Kh3 10.Lf5+ Kg2 11.Lg4 Kf1 12.Lc5 Ke1 13.Ld4 Kd2 14.Lc5 Tf1 15.Te1 Td1 16.Ld4 Kc1 17.De3+ Kb1 18.Lc5 Ka1 19.Ld4 Tb1 20.Tc1 Td1 21.Lc5 Td2 22.Tg1 Tf1 23.Tg2 Lg1 24.Th2 Kb1 25.Th3 Lh2 26.Th4 Tg1 27.Ld4 Tg2 28.Lc5 Lg1 29.Ld4 Th2 30.Lc5 Kc1 31.Ld4 Kd1 32.Lc5 Ke1 33.Ld4 Td1 34.Dc1 Th3 35.Db1 Lh2 36.Le3 Kf1 37.Lc1 Kg2 38.Da1 Tg1 39.Lf5 Kf1 40.Le4 Ke1 41.Ld5 Kd1 42.Lf3 Te1 43.Le4 Lg1 44.Lf3 Th2 45.Le4 Tg2 46.Lf3 Lh2 47.Le4 Tgg1 48.Lf3 Tgf1 49.Db1 Lg1 50.Th2 Dh8 51.Tg2 50 moves rule.

So, 51...Dh6# is impossible, and of course 51...-- 52.Le3# also. (2014-11-25)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 4bR1q/p1pp1Np1/1p2ppK1/7n/5P2/3P1BP1/PPP1PPR1/1QBkrrbN
Input: Gerd Wilts, 1995-06-03
24 - P0001415
Jean Roche
289 Europe Echecs 191 10/1974
P0001415
(11+16) cooked
=
hans: This looks 'mission impossible' The captures are clear hxgxfxexdxc(SSLDP)but how got the Dame in game? For d2-d3 only after d3xc2 and g2-g3 after all wT and sT behind the pawns and Sh1 is on place. So how does wD pass wK ? (2010-06-26)
Henrik Juel: Indeed, it seems like an illegal position.
Maybe the idea was to retract as fast as possible: sD, sL, sK to d2 and (much) later to a1, wK out via d2, sK to d2 and later out via g2 to e8, sD to d8, sL to c8; this plan requires several T retractions and screenings, and possibly it takes 50.0 retractions or more before b7-b6 can be retracted as the last pawn move in the game. I did not bother to count, because the idea makes sense only if the position is legal.
What is the meaning of the keyword 'unused' here? (2010-06-27)
Gerd Wilts: The position is indeed illegal. I removed the unnecessary keyword 'unused'. (2010-06-27)
comment
Keywords: 50 move rule, Illegal position
Genre: Retro
FEN: 1B3b2/q1ppppp1/1p6/p7/7P/3P2Pb/PPp1PPrr/RRnk1K1n
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2010-06-27 more...
25 - P0001442
Nikita M. Plaksin
316 Europe Echecs 217 01/1977
4. Preis
P0001442
(14+12)
Weiß nimmt 1 Zug zurück, dann #1
(Ist die Lösung legal?)
AV: 1.g4 f5 2.Cc3 Cf6 3.Ce4 Cd5 4.Cf6+ gxf6 5.Cf3 Fh6 6.Ce5 Ff4 7.g5 h5 8.Cg4 hxg4 9.d4 Fd6 10.Ff4 Th3 11.Fe5 Ta3 12.h4 Rf7 13.h5 Re6 14.h6 Cc3 15.h7 Rd5 16.h8F Rc4 17.Fg7 Dg8 18.Th8 Dd5 19.f4 Rb4 20.Rf2 Ta4 21.Rg3 Df3+ 22.Rh4 Dg3+ 23.Rh5 Cc6 24.Rg6 Cb5 25.Rf7 Ta3 26.e4 Tb3 27.Fc4 Ta3 28.De2 Tb3 29.Td8 Ta3 30.Th1 Fc5 31.Thh8 Dh4 32.The8 Cd6+ 33.Rf8 Cf7 34.Fh6 Ch8 35.g6 Dg5 36.fxg5 f4 37.Fg8 f5 38.d5 Fd4 39.Feg7 Ff6 40.e5 Te3 41.exf6 Te6 42.f7 Tf6 43.Fh7 e6 44.d6 Ce7 45.dxe7 d6 (début du décompte des 50 coups) 46.Rg8 Fd7 47.Tf8 Fc6 48.Td7 Te8 49.Td8 Fd5 50.Tb8 Tc8 51.Td8 Rc5 52.Rf8 Rb6 53.Re8 Rc5 54.Rd7 Rb6 55.Tf8 Te8 56.Td8 Rc5 57.Rc8 Rb6 58.Rb8 Rc5 59.Ra8 Rb6 60.Tb8 Tc8 61.Td8 Rc5 62.Td7 Tg8 63.Ff8 Tg7 64.Fg8 Th7 65.Fhg7 Th3 66.Fh6 Rb6 67.Fh7 Tb3 68.Ffg7 Ta3 69.Te8 Tb3 70.Tdd8 Ta3 71.Rb8 Tb3 72.Rc8 Ta3 73.Rd7 Tb3 74.Tb8 Ta3 75.Tec8 Tb3 76.Re8 Rc6 77.Rf8 Rd7 78.Rg8 Ta3 79.Ff8 Tb3 80.Rg7 Ta3 81.Fg8 Tb3 82.Rh7 Ta3 83.Fhg7 Tb3 84.Rh6 Ta3 85.Rh5 Tb3 86.Rh4 Ta3 87.Fh6 Tb3 88.Fh7 Ta3 89.Ffg7 Tb3 90.Tg8 Ta3 91.Ff8 Tb3 92.Tg7 Ta3 93.Fg8 Tc3 94.Th7 Tb3 95.axb3! (juste à temps) (2005-06-04)
AV: 95...Fc6 (et l'on recommence à compter) 96.Fhg7 Fb5 97.Th5 Fc6 98.Fh6 Fb5 99.Fh7 Rc6 100.Ffg7 Rd7 101.Tg8 Fc6 102.Ff8 Rc8 103.Dh2 Rb8 104.Dh1 Fd7 105.Ffg7+ Fc8 106.Td8 Ra8 107.Td7 Rb8 108.Ff8 Ra8 109.Fg8 Rb8 110.Fhg7 Ra8 111.Th7 Rb8 112.Fh6 Ra8 113.Tg7 Rb8 114.Fh7 Ra8 115.Tg8 Rb8 116.Ffg7 Ra8 117.Tgd8 Rb8 118.Ff8 Ra8 119.Fg8 Rb8 120.Fhg7 Ra8 121.Rh5 Rb8 122.Rh6 Ra8 123.Rh7 Rb8 124.Fh6 Ra8 125.Rg7 Rb8 126.Fh7 Ra8 127.Rg8 Rb8 128.Ffg7 Ra8 129.Rf8 Rb8 130.Re8 Ra8 131.Ff8 Rb8 132.Fg8 Ra8 133.Fhg7 Rb8 134.Dh6! [134.Dh7?] 134...Ra8 135.Dh7 Rb8 136.Fh6 Ra8 137.Dg7 Rb8 138.Fh7 Ra8 139.Dg8 Rb8 140.Ffg7 Ra8 141.Rf8 Rb8 142.Te8 Ra8 143.Tdd8 Rb8 144.Td7 Diagramme, juste à temps: ce coup ne pourrait être le 145e. Les Blancs peuvent jouer 144.Txc8# après reprise du dernier coup. (2005-06-04)
comment
Keywords: 50 move rule, Help retractor, Non-standard material, Promotion (L)
Genre: Retro
FEN: 1kb1RKQn/pppRPPBB/3pprPB/5pP1/5pp1/1P6/1PP5/8
Reprints: feenschach 44 12/1978
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-10 more...
26 - P0001508
Nikita M. Plaksin
Valery Liskovets

381 Europe Echecs 265 01/1981
P0001508
(13+14)
#1 vor 250
VRZ, Typ Proca
VL: Cf. P0001509, which is
an improved version of this problem. (2004-08-17)
comment
Keywords: 50 move rule, Defensive Retractor, Type Proca
Genre: Retro
FEN: 2brqkBK/1pRQbP1p/2ppRp2/4p3/2r1p3/1P2P1P1/p1PP4/NB6
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-28 more...
27 - P0001509
Nikita M. Plaksin
Valery Liskovets

381bv Europe Echecs 271 07/1981
Lob
P0001509
(13+12)
#1 vor 252
VRZ, Typ Proca
VL: Retro: 1.h4! a3 2.Ba2 R@ 51.Bb1 a4! (51... R@?? a draw by the 50 moves
rule) 52.Ba2 R@ 101.Bb1 a5 (the same) 151.Bb1 a6 152.Ba2 T@ 199.Ba2 a7!
(199... R@?? an illegal draw by a 3d repetition: R has only 12 squares to
visit, 4*12=48!) 249.Bb1 g*Sf5 (again 249... R@?? a draw by the 50 moves
rule) 250.Sh4 R@ 251.Sf3 R@ 252.Sg5 & S*h7#
(249... g*Rf6? 250.Ba2 & f*e7#)

NOT:
Retro: 1.h3? a3 and then Bl, threatening an illegal draw by a 3d
repetition, will force W to retro-move h2-h3!

Rook can visit each square no more than twice on odd and twice on even
moves, otherwise a draw would stop the retro-game by the 3 times
repetition rule. Unless b.P occupies a6, there are 13 or more squares
accessible for R. 4*13=5250, so that the 50 moves rule acts. When b.P
occupies a6, only 12 squares are accessible for b.R with 4*12=48 moves
(a corresponding route is evident).

Genesis: b2-b3 is possible only with w.Bc1. Pe6 came from a2. Pe3 came
from f4 with w.Pf3(2). g6*f5 is the critical move. (2002-04-03)
comment
Keywords: 50 move rule, Defensive Retractor, Type Proca
Genre: Retro
FEN: 3Brk1K/1ppRb2p/3pPP2/3p1p2/1r2P2P/1P2p3/p1PP2P1/NB6
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-28 more...
28 - P0001545
Andrey Frolkin
416v Europe Echecs 292 04/1983
4. Preis
P0001545
(13+13)
Darf Weiß #1?
Keywords: 50 move rule, Non-standard material, Promotion, Sliding block puzzle
Genre: Retro
FEN: knRBrRRR/p1Kp1BRb/3pPrRr/4pPpp/5p2/8/3P2P1/8
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-10 more...
29 - P0001546
Michel Caillaud
417 Europe Echecs 292 04/1983
Dr. L. Ceriani zum Gedenken
2. ehrende Erwähnung
P0001546
(14+12)
Wo wurde die sD geschlagen?
Henrik Juel: The problem doesn't involve the 50 moves rule: from f7-f6 to g6-g5 just 29 moves are needed. Rather it shows the Ceriani idea of capturing bQ early on d8 with a wS to make room for bK. Retroplay: -1.Rh2 g5xQ -2.Rh3 g6 -3.Bh2 Rg1 etc. (2003-03-03)
Michel Caillaud: The 50 moves rule is used to refute the try -1.Rh2xQg2? (in that case, 53,5 moves separate g5xQh4 and f7-f6) (2003-03-07)
Henrik Juel: Very nice; unfortunately the try was too well hidden for me. (2003-03-17)
Renny Bosch: That comment about the 50-move rule defeating the try -1 Rh2xQg2 requires further explanation. The retro play must go like this: The bP at h4 must uncapture something (the wQ, of course) and retract to g6 in order to allow the Rooks and Kings to retract out of the bottom row. But then the only way that a bR can return home to h8 is for the wS at h5 to retract somewhere, and the only possible path goes through f6, because the wP's at g3 and f4 cannot retract until the wB (which has to be uncaptured at g6) has returned home to f1. With a wS at f6, the bK must be able to go to d8 to excape check. Therefore the bQ must have been captured at d8. So what did I overlook? (2007-10-20)
Henrik Juel: I appreciate your comments, Renny. Here you seem to have overlooked that bPh4 need not retract all the way to g6. With that bP on g5 there is still enough room for the kings and rooks to get out of row 1. But it takes a lot of moves including two screenings by bQ on b1 (to let bK retract from b2 to c1 with a wR on a1). I did not check Michel's count. (2007-10-22)
Renny Bosch: Wow! Formidable! That really brings out the full beauty of this composition. Thanks for your explanation, Henrik. (2007-10-24)
AV: Essai en prenant la DN en g2 : Rg2, Da5, Ta1, Tb6, Fh2, Ch1, Ch5, Pa2, a3, c2, d2, e2, f2, f4, g3 (15)/ Re8, Dd8, Tb4, Tb5, Fc8, Ff8, Pb7, c7, d7, e7, f7, g5, g7 (13) : 1...f6 2.Da6 Rf7 3.Da5 Rg6 4.Da6 De8 5.Da5 Df7 6.Da6 Db3 7.Da5 Db1 8.Rf3 Rf5 9.Re3 Rg4 10.Da4 Rh3 11.Db3 Rg2 12.De6 Rf1 13.Dd6 Re1 14.De6 Rd1 15.Dd6 Rc1 16.De6 Rb2 17.Dd6 Df1 18.De6 Dh3 19.Tg1 Df5 20.Tg2 Ra1 21.Fg1 Tb1 22.Th2 Tf1 23.Th4 Rb1 24.Tg4 Rc1 25.Fh2 Rd1 26.Rf3 Tb1 27.Tb5 Tc1 28.Tb1 Tg1 29.Ta1 Tb1 30.Dd6 Rc1 31.De6 Rb2 32.Dd6 Tg2 33.Fg1 Th2 34.De6 Th4 35.Fh2 Tg1 36.Tc1 Tg2 37.Fg1 Tgh2 38.Ta1 T2h3 39.Fh2 De5 40.Tg1 Dd6 41.Rg2 De5 42.Rf1 Dd6 43.Re1 De5 44.Tf1 Dd6 45.Fg1 Th2 46.Rd1 Tg2 47.Fh2 Th3 48.Th4 Ra1 49.Rc1 Tg1 50.Td1 Te1 51.Fg1 Th2 52.Dg4 Tg2 53.Fh2 Tgg1 54.Th3 Tgf1 55.Dh4 gxh4 56.Fg1 Dc6 57.Th2 Dg2 58.Txg2 Mais la partie aurait été nulle (règle des 50 coups). Donc la DN a été prise à domicile (en d8). (2007-10-25)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 2b2b2/1pppp1p1/5p2/7N/5P1p/P5P1/P1PPPPR1/k1KRrrBN
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2003-08-24 more...
30 - P0001567
Pascal Wassong
437 Europe Echecs 310 10/1984
4. ehrende Erwähnung
P0001567
(14+11)
#1
Hat Weiß rochiert?
AV: Dans l'application de la règle des 50 coups, le roque change la nature d'une position, comme une prise ou un mouvement de pion. Une genèse sans roque ou avec le petit roque donnerait 53 ou 52 coups sans changement, et donc la partie serait nulle. La seule genèse compatible avec la légalité d'un mat en un coup est donc celle-ci : on part de la position Re1, Ta1 et h3, Fg1 et g8, Ch4 et h8, Pa2, c2, d2, f2, f3, f4 et g2 (14) / Rf6, Ta5 et h1, Pa6, b7, c7, d7, e7, f5, f7 et g6 (11) dans laquelle la Th3 provient de la promotion du Pb2 en a8.
1.0-0-0 Ta4 2.Fh2 Te1 3.Fg3 Te6 4.Rb2 Ta5 5.Tc1 Tee5 6.Thh1 Te6 7.Thd1 Te1 8.Rc3 Th1 9.Rd3 Th3 10.Fh2 Tg3 11.Th1 Tg5 12.Fg1 Th5 13.Th3 Th7 14.Tg3 Tg7 15.Fh7 Tg8 16.Fh2 Ta8 17.Th1 Tb5 18.Fg1 Ta7 19.Thh3 Tb1 20.Tg5 Ta1 21.Th5 Tb1 22.Fg8 Ta1 23.Th7 Tb1 24.Tg7 Ta1 25.Fh7 Tb1 26.Tg8 Ta1 27.Ta8 Tb1 28.Fh2 Ta1 29.Tg3 Tb1 30.Tg5 Ta1 31.Th5 Tb1 32.Fg8 Ta1 33.Th7 Tb1 34.Tg7 Ta1 35.Fh7 Tb1 36.Tgg8 Ta1 37.Tgf8 Tb1 38.Re2 Th1 39.Fg1 Th3 40.Fh2 Tg3 41.Rf1 Tg4 42.Rg1 Tg5 43.Fg3 Rg7 44.Rh2 Rh6 45.Rh3 Rg7 46.Tg8+ Rh6 47.Tg7 Th5 48.Fh2 Tg5 49.Fg8 Th5 50.Rg3 Nulle ? 50...d6 Non, de justesse ! Et donc : 51.Th7# (2005-06-23)
comment
Keywords: 50 move rule, Castling (wl)
Genre: Retro
FEN: R5BN/rpp1ppR1/p2p2pk/5p1r/5P1N/5PK1/P1PP1PPB/8
Input: Gerd Wilts, 1995-06-03
Last update: Rainer Staudte, 2019-08-11 more...
31 - P0001583
Nikita M. Plaksin
Andrej N. Kornilow

453v Europe Echecs 322 10/1986
P0001583
(16+14)
#1
NL
play all play one stop play next play all
hans: 1. --- Dxe2# (not 1. Se3#)
-1 Sd4-b3 d7-d6 -2. Db3-b2 Lb2-a1 now wD/wT/wT out, then bK to a1 with shield Lb2, further bD/T/T out the same way,then bK out via g2/h3 To avoid the 50 moves rule, there is g6-g5 on 49e move. (2011-01-31)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 6B1/p3pp2/3p3p/1P4p1/1p6/BNP2KP1/PQpPPPrP/bRRNkqrn
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2000-10-07 more...
32 - P0001666
Andrey Frolkin
Gerd Wilts

535 Europe Echecs 373 10/1990
P0001666
(13+13)
Welches war der letzte Bauernzug?
R: 1. Tf8-e8 Te8-d8 2. Ld8-e7 Te7-e8 3. Le8-f7 Tf7-f6 4. Tf6-g6 Lg6-h7 5. Th7-g7 Tg7-f7 6. Lf7-e8 Te8-e7 7. Le7-d8 Td8-e8 8. Le8-f7 Tf7-g7 9. Tg7-h7 Lh7-g6 10. Tg6-g7 Tg7-f7 11. Lf7-e8 Te8-d8 12. Ld8-e7 Te7-e8 13. Le8-f7 Tf7-g7 14. Tg7-g8 Lg8-h7 15. Th7-g7 Tg7-f7 16. Lf7-e8 Te8-e7 17. Le7-d8 Td8-e8 18. Le8-f7 Tf7-g7 19. Tg7-g6 Tg6-h6 20. Th6-h7 Lh7-g8 21. Tg8-g7 Tg7-g6 22. Tg6-f6 Tf6-f7 23. Lf7-e8 Te8-d8 24. Ld8-e7 Te7-e8 25. Le8-f7 Tf7-g7 26. Tg7-g8 Lg8-h7 27. Th7-g7 Tg7-f7 28. Lf7-e8 Te8-e7 29. Le7-d8 Td8-e8 30. Le8-f7 Tf7-g7 31. Tg7-h7 Lh7-g8 32. Tg8-f8 Tf8-f7 33. Lf7-e8 Te8-d8 34. Ld8-e7 Te7-e8 35. Le8-f7 Tf7-f6 36. Tf6-g6 Lg6-h7 37. Th7-g7 Tg7-f7 38. Lf7-e8 Te8-f8 39. Tf8-g8 Tg8-g7 40. Tg7-h7 Lh7-g6 41. Tg6-g7 Tg7-g8 42. Tg8-f8 Tf8-e8 43. Le8-f7 Tf7-f8 44. Tf8-g8 Tg8-g7 45. Tg7-g6 Lg6-h7 46. Th7-h8 Th8-g8 47. Tg8-g7 Tg7-f7 48. Lf7-e8 Te8-e7 49. Le7-d8 Td8-e8 50. Le8-f7 Tf7-g7 51. g7-g8=T Tg8-h8 52. Th8-h7 Lh7-g6 53. g6-g7 Tg7-g8 54. Tg8-f8 Tf8-f7 55. Lf7-e8 Te8-f8 56. Tf8-g8 Lg8-h7 57. Th7-h6 h6-h5 58. h5xSg6 Sh4-g6
play all play one stop play next play all
Keywords: 50 move rule, Promotion (TTTTt), Sliding block puzzle, Non-standard material
Genre: Retro
FEN: knRrR1RR/p1KpBBRb/3pPrRr/4pPpp/5p2/8/3P2P1/8
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
33 - P0001695
Boris Ostruh
Marko Klasinc

Die Schwalbe 48 12/1977
3. Preis
P0001695
(10+14)
#1 vor 2400
VRZ, Typ Proca
Keywords: 50 move rule, Defensive Retractor, Type Proca
Genre: Retro
FEN: 8/8/6PP/5ppQ/nr2nPRp/4pbBk/p1pbPr2/1q2NBK1
Reprints: feenschach 46 04-06/1979
668 FIDE Album 1977-1979 1984
A Shakhmatnaya Kompozitsiya 64, p. 61, 04/2005
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2013-08-19 more...
34 - P0001727
Johannes Manfred Wittlich
The Fairy Chess Review 1948
P0001727
(16+15) cooked
Wer gewinnt?
b) Spiegelbild
a) remis, da nach b2xLc3 100 Einzelzüge ohne Schlag und Bauernzug geschehen sind.
b) Schwarz gewinnt mit 1. Dxd8+
play all play one stop play next play all
Cook: R: 1. Sf6-g8 Lg8-h7 2. Kg7-f8 Lh7-g8 3. Df8-e8 Dd8-e8 4. La3-d6 Kd8-c8 5. Sd4-c6+ Lg8-h7 6. Se4-f6 Lh7-g8 7. Sd6-e4 Sc6-b8 8. Sc8-d6+ Se5-c6 9. Tb8-a8 Ta8-a7 10. Ta7-b7 Sg4-e5 11. Tb7-b8 Sh2-g4 12. Sd6-c8 Tc8-a8 13. Ta8-a7 Ta7-a6 14. Tb8-b7 Tb7-a7 15. Ta6-a8 Ta7-b7 16. Ta8-b8 Tb8-c8 17. Sf5-d6 Kc8-d8 18. Dg8-f8 Kb7-c8 19. Sg3-f5 Kc6-b7 20. Sf3-d4+ Tb7-b8 21. Tc8-a8 Ta8-a7 22. Sg1-f3 Tb8-a8 23. Ta8-a6 Ta7-b7 24. ... Ta6-a7 25. Ta7-a8 Ta8-b8 26. Tb8-c8 Dc8-e8 27. Kf8-g7 Db7-c8+ 28. Ke8-f8 Kd5-c6 29. Kd8-e8 Dc6-b7 30. Kc8-d8 De6-c6 31. Kb7-c8 Ke5-d5 32. Tf8-b8 Te8-a8 33. Ta8-a7 Kf4-e5 34. Td8-a8 Ta8-a6 35. Ka6-b7 Tc8-a8+ 36. Kb5-a6 ... 37. Kc4-b5 De5-e6+ 38. Kb3-c4 De4-e5 39. Kb2-b3 ... 40. Kc1-b2 ... 41. Kd1-c1 ... 42. Ke1-d1 ... 43. Dg7-g8 ... 44. Dd4-g7 ... 45. Db4-d4 ... 46. Db1-b4 ... 47. Dd1-b1 ... 48. Lc1-a3 ... 49. b2xLc3
Keywords: 50 move rule, Twinning by board reflection
Genre: Retro
FEN: RnkqQKNn/rRpppp1b/rpNB2pp/p7/P6P/2P5/2PPPPP1/5B2
Reprints: 1370 FIDE Album 1945-1955 1964
(179) Problem 127-132 09/1969
(1) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2010-04-25 more...
35 - P0001857
Gyula Breyer
The Chess Amateur 1922
Version von Dr. L. Garaza
P0001857
(13+13) cooked
Wer gewinnt?
Keywords: 50 move rule, Sliding block puzzle
Genre: Retro
FEN: KB6/QpN1p2p/rRpkP3/Rqp1p3/b1P5/brP5/pPP5/NB6
Reprints: 806 FIDE Album 1914-1944/III 1975
Shakhmaty v SSSR 1990
T2 Phénix 265, p. 10463, 09/2016
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2017-09-08 more...
36 - P0001920
Leon Loewenton
(II) Problem 33-36 02/1956
N. Petrovic gewidmet
2. Preis
P0001920
(16+12)
#4
AV: Rf1,Db5,Th1,h5,Fc1,g8,Cb2,h8,Pa2,b4,c3,d2,e2,f2,h2,h3(16)/Ra3,Th7,Fa5,b3,Ca1,Pa7,b6,c2,d7,e7,f7,g6,h6(13)

1.axb3 Ra2 2.Cd3 Rb1 3.Fa3 Tg7 4.Cb2 Rc1 5.Cd3+ Rd1 6.Ce5 Th7 7.Cf3 Tg7 8.Cg1 Th7 9.Rg2 Re1 10.Rf3 Rf1 11.Re4 Rg2 12.Cf3 Tg7 13.Tb1 Th7 14.Tb2 Tg7 15.Ce5 Rf1 16.Rd3 Re1 17.Rc4 Rd1 18.Da4 Rc1 19.Ta2+ Rb1 20.Fc1 Th7 21.Tg5 Tg7 22.Tg1 Th7 23.Th1 Tg7 24.Cf3 Th7 25.Cg1 Tg7 26.Fa3 Th7 27.Tb2+ Rc1 28.Rb5 Rd1 29.Ra6 Re1 30.Rb7 Rf1 31.Cf3+ Rg2 32.Rc8 Tg7 33.Ta2 Th7 34.Fc1 Tg7 35.Da3 Th7 36.Db2 Tg7 37.Ta4 Th7 38.Da2 Tg7 39.Fa3 Th7 40.Tb1 Tg7 41.Db2 Th7 42.Dc1 Tg7 43.De1 Th7 44.Fc1 Tg7 45.Tb2 Th7 46.Cg1 Tg7 47.Rd8 Th7 48.Re8 Tg7 49.Rf8 Th7 diagramme 50.Cf3 Tg7! 51.Rxg7!! [51.Dg1+? Les Noirs réclament la nulle: 50 coups.] 51...Rxh3 [51...Fxb4 52.Dg1+] 52.Dg1 [52.bxa5? Rg2] 52...Fxb4 53.Dg3# (2005-05-29)
more ...
comment
Keywords: 50 move rule
Genre: Retro
FEN: 5KBN/p2ppp1r/1p4pp/b7/RP6/1PP4P/1RpPPPkP/n1B1Q1N1
Reprints: (VI) Problem 61-64 07/1959
117 Europe Echecs 67-68 08/1964
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2019-12-08 more...
37 - P0001934
Nikita M. Plaksin
(38) Problem 188-193 05/1979
P0001934
(15+14)
Remis
hans: From FEN-position to diagram in exactly 50 moves!
4k1NN/p1pppp1p/5bp1/1p6/b4n2/Rr2qnP1/PPPPPPP1/RQ1K1B2

1. axb3 Qd3 2. Qa2 Qe3 3. Rc1 Qd3 4. Qb1 Qe3 5. Ra1 Qd3 6. Qa2 Qe3 7. Qa3 Qd3 8. Qd6 Qe3 9. Ra3 Qd3 10. Rca1 Qe3 11. Kc1 Qd3 12. Kb1 Qe3 13. Ka2 Qd3 14. Re1 Qe3 15. Kb1 Qd3 16. Ra1 Qe3 17. Ka2 Qd3 18. Ka3 Qe3 19. Kb4 Qc5+ 20. Ka5 Qa3 21. Qc5 Qa2 22. Qb4 Qb1 23. Ra3 Qa2 24. Ra1 Qb1 25. Qc5 Qe1 26. Rd1 Nh4 27. Raa1 Nf3 28. Qa3 Nh4 29. Qa2 Nf3 30. Qb1 Nh4 31. Ra3 Nf3 32. Qa2 Nh4 33. Ra1 Nf3 34. Qb1 Nh4 35. Qd1 Nf3 36. Rc1 Nh4 37. Raa1 Nf3 38. Kb4 Nh4 39. Ka3 Nf3 40. Ka2 Nh4 41. Kb1 Nf3 42. Ra3 Nh4 43. Ka2 Nf3 44. Ra1 Nd3 45. Kb1 Bd4 46. R1a2 Be5 47. Ka1 Bf6 48. Qb1 Qd1 49. Qc1 Nfe1 50. Qb1 Nc1 (2011-02-15)
Henrik Juel: 49.5 moves have been played without captures or pawn moves. White ensures half a point with 51.Sh6! and draw by the 50 moves rule, not e.g. 51.Sxf6+? exf6 52.bxa4 Sb3+ 53.cxb3 Sc2#. (2011-02-15)
comment
Keywords: 50 move rule
Genre: Retro
FEN: 4k1NN/p1pppp1p/5bp1/1p6/b7/RP4P1/RPPPPPP1/KQnqnB2
Reprints: Problem 1980
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2014-05-20 more...
38 - P0001940
Nikita M. Plaksin
Shakhmaty v SSSR 1980
Spezialpreis
P0001940
(13+16)
Remis
hans: 1. b4 a5 2. Bb2 Na6 3. Bd4 Nc5 4. Nc3 Na4 5. Bc5 Nb6 6. b5 Nh6 7. a4 Nf5 8.
Na2 Nh4 9. Nb4 axb4 10. a5 Rb8 11. a6 Na8 12. a7 Nb6 13. a8=Q Rg8 14. Qa2
Ra8 15. Qe6 Ra3 16. Qg6 hxg6 17. Qb1 Na8 18. Ba7 b6 19. Qb3 Bb7 20. Qd3 Bf3
21. Qf5 gxf5 22. Nh3 Bh5 23. Nf4 Bg6 24. e3 Rh8 25. Bc4 Rh6 26. f3 Bh7 27.
Ng6 Bg8 28. Nh8 Rd6 29. h3 g6 30. Rf1 Bh6 31. Rf2 Bf4 32. Rf1 Bh2 33. f4
Rdd3 34. Rf3 Rac3 35. Rg3 Kf8 36. Rg5 Kg7 37. Rh5 Kf6 38. Rh7 Qc8 39. Rg7
Bh7 40. Rg8 Qa6 41. Rb8 Qa3 42. Rb7 Qb2 43. Bb8 Rb3 44. Rba7 Qd4 45. R7a2
Ra3 46. Rb2 Ra7 47. Rba2 Rb7 48. Ba7 Rb8 49. Rb2 Rg8 50. Rba2 Rg7 51. Bb8
Bg8 52. Rb2 Rh7 53. Rba2 Rh5 54. Rb2 Rg5 55. Rba2 Rg3 56. Rb2 Rf3 57. Rba2
Rf2 58. Rb2 Ra3 59. Rba2 Ra7 60. Rb2 Rb7 61. Ba7 Rb8 62. Rba2 Bh7 63. Ra6
Rg8 64. Bb8 Rg7 65. Ra7 Bg8 66. Rb7 Rh7 67. Ba7 Rh5 68. Rb8 Bh7 69. Rg8 Rg5
70. Rg7 Bg8 71. Rh7 Rg3 72. Rh6 Rgf3 73. Bb3 Kg7 74. Ba4 Kf8 75. Rh7 Ke8
76. Rg7 Bh7 77. Bb8 Kd8 78. Bb3 Kc8 79. Rg8+ Kb7 80. Ba4 Qg7 81. Re8 Bg8
82. Rf8 Bg3 83. O-O-O {50 moves rule} 1/2-1/2 (2012-11-14)
Olaf Jenkner: Warum nicht z.B. 83. Te8 remis?
Was bedeutet das Schlüsselwort unused? (2012-11-14)
Henrik Juel: The castling shows that White never moved his king before; otherwise the position could be reached faster, and the 50 moves rule could not be applied.
The keyword unused seems non-sensical here and should be deleted (2012-11-14)
A.Buchanan: This problem is very interesting. It's orthodox 50M, so that castling does not reset the counter, and the timing works out nicely. But it makes me wonder... suppose we have a problem where it is B32 which was the last reset. Then W83 0-0-0 would prove that the position had already been at 50.0. If 50M convention (which needs to be rewritten because it's a mess) operated like 3Rep, then the game end would have been mandatory after B82. So castling W83 would be illegal. Is this how one would want 50M convention to work? Or should there be a carve-out to say: if you can definitely prove that no-one claimed, then no-one claimed. And should there be a similar carve-out for 3Rep rule? See https://www.thehoppermagazine.com/AA010 (2022-01-20)
A.Buchanan: Personally, I think no carve-outs. The 50M convention should be rewritten as: "A position is considered as a draw if it can be proved that the last 50.0 moves in the proof game combined with the solution did not contain a capture or pawn move. Unless expressly stipulated, this applies only to retro-problems." (2022-01-20)
Thomas Volet: What if the composer intends the retroplay to go beyond 50 non-P and non-capturing moves? (2022-01-20)
A.Buchanan: Hi Thomas - thanks for your question. I think it’s best if we take this offline. I will email you, if that’s ok (2022-01-21)
James Malcom: This is the Volet problem in question: P0008399 In hindsight, it is quite humorous that the 75 move rule was later introduced in the 21st century. (2022-01-21)
Thomas Volet: The question was not directed specifically to P0008399, which is just one of several compositions with the property at issue. (2022-01-22)
A.Buchanan: I've emailed Thomas. My earlier comment should have include checkmate as a third mechanism to zero the count. (2022-01-22)
James Malcom: You can always carry it on over to MatPlus. (2022-01-24)
more ...
comment
Keywords: 50 move rule, Castling (wl)
Genre: Retro
FEN: nB3RbN/1kppppq1/1p4p1/1P3p2/Bp3P1n/4PrbP/2PP1rP1/R3K3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-01-25 more...
39 - P0001967
Nenad Petrovic
628 Sahovski vjesnik 1950
Dr. Fabel und Dr. Ceriani gewidmet
2. Preis
P0001967
(15+15)
Längste Beweispartie?
(AL: 1021,0)
1. S S 50. S b6 100. S h6 250. S h3 300. a3 S 450. a6 S 500. b3 S 550. g3 S 600. 0-0 S 649. S hxSg 699. h3 S 899. h7 S 949. axSb Ke8 950 Tf1 Kd8 951. Tg1 Ke8 952. Tf1 Dd8 1020. Kd1 Kd8 1021. De1 Ke8=
play all play one stop play next play all
Henrik Juel: Note that in problems castling acts like capture and pawn move with respect to the 50 moves rule. After 949.a6xSb7 there are 4 moves left by [Pa7]; but each camp can shift only KDT, on d1-g1 and b8-e8, respectively, so the triple repetition rule now limits the length of the game. (2004-09-09)
comment
Keywords: 50 move rule, Non-Unique Proof Game, Longest Proof Game, Castling
Genre: Retro
FEN: Nrq1kb2/1PpppppP/1p6/8/8/pP4P1/BRPPPPp1/BrnKQ1Rb
Reprints: (I) Problem 5-6 12/1951
Problem 7-9 03/1952
1439 FIDE Album 1945-1955 1964
(130) Problem 91-94 04/1964
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2012-04-08 more...
40 - P0002184
Andrej N. Kornilow
Andrey Frolkin

6748v Die Schwalbe 119 10/1987
P0002184
(15+14)
#1 (AP)
Henrik Juel: If Black may castle, he has the move; the retroplay involves extracting 5 R's along f6-g6-g4-h4-h2-g2-g1-b1-b2-a2, then a bR is reinserted on f8 and f7-f5 is retracted. The stipulation looks strange, what is the solution? (2003-09-11)
VL: AP after Keym implies two partial solutions,
a formal and the intentional one. These are:

I) 1.Qxa8#. II) 0... 0-0-0(!) 1.Qa8#.

Retro: ... -49... Rf8 -50.@ f7(f6)!

The 50-move rule combined with
AP(pRA)! (2003-09-15)
comment
Keywords: 50 move rule, a posteriori (AP), Non-standard material, Castling (sg)
Genre: Retro
FEN: r3k2n/2pp1Rp1/4p1Bp/5prN/5PrR/1P4P1/Q1PPPPrB/Nb2K2n
Reprints: 548 Ukrainisches Album 1986-1990
(E) feenschach 154 2004
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2006-11-15 more...
41 - P0002189
Gyula Breyer
180 The Chess Amateur 02/1922
Dedicated to T.R. Dawson and W. Hundsdorffer, the Greatest Masters of Retrograde Analysis
P0002189
(13+13) cooked
Who wins?
"The wonderful No. 180, certainly the most glorious retro I have had the privilege of yet printing, is sent me by the Budapest Circle. Composed during the war, it's dedication shows that chess could rise supremely over all the turmoil. Its talented composer's death was announced only a few days ago, at a tragically early age. So that no solver shall miss the idea, I state distinctly that the retro analysis proves the game is DRAWN by virtue of the 50-move Rule! ... This beautiful application of the well-known zig-zag puzzles to a retro study has played havoc with the solving list."
(TRD)
comment
Keywords: 50 move rule, Sliding block puzzle
Genre: Retro
FEN: KB6/QpN1p2p/rRpkP3/1Rp1p3/bqP5/brP5/pPP5/NB6
Reprints: Problem 127-132 09/1969
Pat a Mat 19 04/1994
T1 Phénix 265, p. 10462, 09/2016
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2017-09-08 more...
42 - P0004173
Leon Loewenton
798 Problem 31-32 09/1955
P0004173
(16+12)
#3
b) Platzwechsel Sa1 und Sh8, sKh1 nach g2, dann #4
Keywords: 50 move rule, Interchange
Genre: Retro
FEN: 5KBn/p2ppp1r/1p4pp/b7/RP6/1PP4P/1RpPPP1P/N1B1Q1Nk
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-10-25 more...
43 - P0004174
Leon Loewenton
Maroczy spomen t. 1952
Spezialpreis
P0004174
(15+12)
#3
more ...
comment
Keywords: 50 move rule
Genre: Retro
FEN: r1b3BN/pp1ppp2/6p1/8/7P/1PP2KPr/PRpPPP1p/QR1N3k
Reprints: (I) Problem 33-36 02/1956
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2019-12-08 more...
44 - P0004178
Leon Loewenton
(VI) Problem 33-36 02/1956
P0004178
(13+12)
Kürzestes Remis ohne 50-Züge-Regel?
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: 1RBBQqr1/PPRrPPp1/KppP1pPk/p2p2pB/6p1/8/8/8
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
45 - P0004227
Leon Loewenton
Problem 1960
P0004227
(14+13)
#2
Längstzüger
1. Txc2 Te8 2. Sa3#
1. Dg2?
play all play one stop play next play all
Keywords: Maximummer, 50 move rule
Genre: Retro, Fairies
FEN: 1Nbq3r/1ppppp1p/8/8/K1p1Q3/1PP3PP/PRrPPP1b/RN1k4
Reprints: 552 FIDE Album 1959-1961 1966
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2019-08-24 more...
46 - P0004361
Nikita M. Plaksin
2680 Problem 109-111 10/1967
P0004361
(15+15)
#2
1. Dc8+? Remis!

1. Dxb8+! Kh7 2. Dh8#
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: nb4k1/1Qpppp2/1p4pp/1p6/1P6/1P4P1/1BPPPPrP/NbNKRRnr
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-10-08 more...
47 - P0004364
Nikita M. Plaksin
Biulletin ZSK 1968
P0004364
(15+14)
#3
senkrecht gespiegelt P0004395.
comment
Keywords: 50 move rule
Genre: Retro
FEN: 8/b1pppp2/1p4p1/p6p/2P5/1P2NQB1/bKPPPPPP/nR1NRrrk
Reprints: 2776 Problem 112-119 02/1968
(1) Problem 124-126 03/1969
Input: Gerd Wilts, 1995-06-03
Last update: hpr, 1999-11-05 more...
48 - P0004395
Nikita M. Plaksin
(2) Problem 124-126 03/1969
P0004395
(15+14)
#3
senkrecht gespiegelt P0004364
comment
Keywords: 50 move rule
Genre: Retro
FEN: 8/2pppp1b/1p4p1/p6p/5P2/1BQN2P1/PPPPPPKb/krrRN1Rn
Input: Gerd Wilts, 1995-06-03
Last update: hpr, 1999-11-05 more...
49 - P0004396
Nikita M. Plaksin
(3) Problem 124-126 03/1969
P0004396
(15+15)
#3
Keywords: 50 move rule
Genre: Retro
FEN: 7N/ppp1pp1b/3p2p1/4k1p1/2Q3PN/PP4P1/BrPPPP1b/nrRKR2n
Input: Gerd Wilts, 1995-06-03
50 - P0004397
Nikita M. Plaksin
(4) Problem 124-126 03/1969
P0004397
(13+14) cooked
#2
TBr: Cooked by Thierry le Gleuher:

For this one we can play 97 moves, before the OO.

My solution (in French) :Rétro: -1.... Ra3b4 -2.Rg1f1 Rb2a3 -3.Ff4e5 Rc1b2 -4.Rf1g1 Rd1c1 -5.Rg1f1 Re1d1 -6.Rh1g1 Rf1e1 -7.Tb6a6 Te1e2 -8.Tb4b6 Tb1e1 -9.Ta4b4 Re1f1 -10.Rg1h1 Rd1e1 -11.Rf1g1 Rc1d1 -12.Re2f1 Fa7b8 -13.Rd3e2 Rd1c1 -14.Rc3d3 Re2d1 -15.Rb2c3 Te1b1 -16.Rc3b2 Rf1e2 -17.Rd3c3 Fb1a2 -18.Ta2a4 Rg1f1 -19.Tb2a2 Fa2b1 -20.Tb1b2 Tf1e1 -21.Te1b1 Rh1g1 -22.Te2e1 Tb1f1 -23.Rc3d3 Tb2b1 -24.Rd3c3 Fb1a2 -25.Rc3d3 Ta2b2 -26.Rb2c3 Ta3a2 -27.Rc1b2 Rg1h1 -28.Rd1c1 Rh1g1 -29.Re1d1 Ta4a3 -30.Rf1e1 Ta3a4 -31.Te1e2 Fa2b1 -32.Tb1e1 Ta4a3 -33.Re1f1 Rg1h1 -34.Rd1e1 Rf1g1 -35.Rc1d1 Re2f1 -36.Rb2c1 Ta3a4 -37.Th1b1 Fb1a2 -38.Rc3b2 Ta2a3 -39.Tg1h1 Tb2a2 -40.Tf1g1 Fa2b1 -41.Td1f1 Tb1b2 -42.Th1d1 Tg1b1 -43.Fg3f4 Rd1e2 -44.Rd3c3 Rc1d1 -45.Re2d3 Td1g1 -46.Te1h1 Rb2c1 -47.Rf1e2 Ra3b2 -48.Rg1f1 Tb1d1 -49.Tf1e1 Tb2b1 -50.O-O (2008-11-02)
comment
Keywords: 50 move rule, Castling
Genre: Retro
FEN: 1b1n4/1pp2ppp/R1p1p3/N1p1BR2/1kP5/1P2P3/b1PPrPPP/n4K2
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2017-03-22 more...
51 - P0004398
Nikita M. Plaksin
(5) Problem 124-126 03/1969
P0004398
(13+14) cooked
#1
TBr: Cooked by Thierry le Gleuher:

This problem is not correct for the 50 moves rule because I can solve it in 97 half-moves instead of 99.

My cook (in French):

1. ... Rh3-g4 2.Rb1-ç1 Rg2-h3 3.Fç4-d5+ Rf1-g2 4.Ra1-b1 Ré1-f1 5.Tg6-h6 Rd1-é1 6.Tg4-g6 Rç1-d1 7.Th4-g4 Td1-d2 8.Th3-h4 Fh2-g1 9.Th4-h3 Tg1-d1 10.Th3-h4 Rd1-ç1 11.Rb1-a1 Ré1-d1 12.Rç1-b1 Rf1-é1 13.Rd2-ç1 Fh7-g8 14.Ré3-d2 Ré1-f1 15.Rf3-é3 Tf1-g1 16.Th4-h3 Rd1-é1 17.Th3-h4 Rç1-d1 18.Th4-h3 Fg1-h2 19.Th2-h4 Rb1-ç1 20.Tg2-h2 Fh2-g1 21.Tg1-g2 Tç1-f1 22.Td1-g1 Fg8-h7 23.Td2-d1 Tg1-ç1 24.Tb5-ç5 Tg2-g1 25.Ta5-b5 Fg1-h2 26.Tb5-a5 Th2-g2 27.Rg2-f3 Th4-h2+ 28.Rf1-g2 Ra1-b1 29.Ré1-f1 Th3-h4 30.Rd1-é1 Th4-h3 31.Rç1-d1 Th3-h4 32.Td1-d2 Fh2-g1 33.Tg1-d1 Th4-h3 34.Rd1-ç1 Rb1-a1 35.Ré1-d1 Rç1-b1 36.Rf1-é1 Rd2-ç1 37.Rg2-f1 Th3-h4 38.Ta1-g1 Fg1-h2 39.Rf3-g2 Th2-h3 40.Ta5-b5 Tg2-h2 41.Tb5-a5 Fh2-g1 42.Ta5-b5 Tg1-g2 43.Tb5-a5 Tç1-g1 44.Ta5-b5 Ré1-d2 45.Ré3-f3 Rf1-é1 46.Rd2-é3 Rg2-f1 47.Tb5-a5 Tg1-ç1 48.Td1-a1 Rh3-g2 49.Rç1-d2 Tg2-g1 50.O-O-O (2008-11-02)
comment
Keywords: Castling, 50 move rule
Genre: Retro
FEN: 4n1b1/ppp2pp1/3p1p1R/2RB1p1N/5Pk1/3P2P1/PPPrPP2/2K3bn
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2017-03-22 more...
52 - P0004399
Nikita M. Plaksin
3 Biulletin ZSK , p. 117, 12/1966
P0004399
(13+15)
Remis
1. 0-0!
play all play one stop play next play all
This problem was part of a New Year's solving contest in the Bull. ZSK. To give the solver a hint, the problem was accompanied by a little poem (s.comment)
more ...
comment
Keywords: 50 move rule, Castling, Help retractor
Genre: Retro
FEN: NbRr1qBn/2ppppkB/1p4p1/2p3P1/2P3p1/1P6/P2PPP2/rb2K2R
Reprints: (6) Problem 124-126 03/1969
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2011-07-11 more...
53 - P0004400
Nikita M. Plaksin
(7) Problem 124-126 03/1969
P0004400
(12+14)
Schwarz nimmt 1 Zug zurück, dann h#1
Keywords: 50 move rule, Castling, Help retractor, Non-standard material
Genre: Retro, h#
FEN: 5rk1/1bRpppr1/6p1/6Kp/5P1r/1P4Pr/PRPPPP2/nr4bN
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-10-09 more...
54 - P0004401
Nikita M. Plaksin
4 Biulletin ZSK 12/1967
P0004401
(13+16)
Weiß nimmt 1 Zug zurück, dann #2
Verführung: R: 1. 0-0-0, dann 1. Dd3+, aber remis wegen 50-Züge-Regel
Lösung: R: 1. 0-0-0, dann 1. 0-0! Kb2 2. Tfb1#
Plaksin beruft sich darauf, daß zur Zeit der Publikation dieses Problems auch die Rochade ein Rücksetzen des 50-Züge-Zählers bewirkte.
R: 1. 0-0-0 Lc8-b7 2. Tg7-g8 Lb7-a6 3. Tg8-g7 Sa6-b8 4. Tg7-g8 Sc5-a6 5. Tg8-g7 La6-b7 6. Tg7-g8 Lb7-c8 7. Tg8-g7 Db8-d8 8. Tg7-g8 Lc8-b7 9. Tg8-g7 Db7-b8 10. Tg7-g8 Lb8-a7 11. Tg8-g7 Da7-b7 12. Tg7-g8 Lb7-a6 13. Tg8-g7 Da3-a7 14. Tg7-g8 Db2-a3 15. Tg8-g7 La6-b7 16. Tg7-g8 Lb7-c8 17. Tg8-g7 La7-b8 18. Tg7-g8 Tb8-e8 19. Tg8-g7 Lc8-b7 20. Tg7-g8 Tb7-b8 21. Tg8-g7 Lb8-a7 22. Tg7-g8 Ta7-b7 23. Tg8-g7 Lb7-a6 24. Tg7-g8 Ta2-a7 25. Tg8-g7 La6-b7 26. Tg7-g8 Lb7-c8 27. Tg8-g7 La7-b8 28. Tg7-g8 Tb8-f8 29. Tg8-g7 Lc8-b7 30. Tg7-g8 Tb7-b8 31. Tg8-g7 Lb8-a7 32. Tg7-g8 Ta7-b7 33. Tg8-g7 Lb7-a6 34. Tg7-g8 Ta3-a7 35. Tg8-g7 La6-b7 36. Tg7-g8 Lb7-c8 37. Tg8-g7 La7-b8 38. Tb8-g8 Lc8-b7 39. Tb7-b8 Lb8-a7 40. Ta7-b7 Lb7-a6 41. Ta4-a7 Se6-c5 42. Tc4-a4 Ta7-a3 43. Td4-c4 La6-b7 44. Tc4-d4 Tb7-a7 45. Td4-c4 La7-b8 46. Tc4-d4 Tb8-b7 47. Td4-c4 Lb7-c8 48. Tc4-d4 Tg8-b8 49. Td4-c4 Lc8-b7 50. Tc4-d4 b7xSc6
play all play one stop play next play all
hans: back 1. 0-0-0, forward 1. 0-0 Kb2 2. Tfb1#
But 1. … Kb2 is move 51 after last pawn-move, so black can claim draw.

R: -1. 0-0-0 Lc8-b7 -2. D Lb7-a6 -3. D Sa6-b8 -4. D Sc5-a6 -5. D La6-b7 -6. D Lb7-c8 -7 D Db8-d8 -8. D Lc8-b7 -9. D Db7-b8 -10. D Lb8-a7 -11. D Da7-b7 -12. D Lb7-a6 -13. D Da5-a7 -14. D Dc3-a5 -15. La7-b8 -16. D La6-b7 -17. D Lb7-c8 -18. D Tb8-e8 -19. D Lc8-b7 -20. D Tb7-b8 -21. D Lb8-a7 -22. D Ta7-b7 -23. D Lb7-a6 -24. D Ta2-a7 -25. D La6-b7 -26. D Lb7-c8 -27. D La7-b8 -28 D. Tb8-f8 -29. D Lc8-b7 -30. Tb7-b8 -31. D Lb8-a7 -32. D Ta7-b7 -33. D Lb7-a6 -34. D Ta3-a7 -35. D La6-b7 -36.D Lb7-c8 -37. D La7-b8 -38. Tb8-g8 Lc8-b7 -39. Tb7-b8 Lb8-a7 -40. Ta7-b7 Lb7-a6 -41. Ta4-a7 Df6-c3 -42. Tc4-a4 Ta7-a3 -43. D La6-b7 -44. D Tb7-a7 -45. D La7-b8 -46. D Tb8-b7 -47. D Lb7-c8 -48. D Tg8-b8 -49. D Lc8-b7 -50. D b7xYc6 (2013-02-04)
Mario Richter: Plaksin's solution is based on the assumption that castling too resets the 50-move-counter. For some historical background see the discussion in the RML, starting with http://www.pairlist.net/pipermail/retros/2006-December/001657.html (2013-02-05)
comment
Keywords: 50 move rule, Castling, Help retractor, Non-standard material
Genre: Retro
FEN: Nn1qrrRn/bbPppp1p/bPp3p1/1p6/4Q3/1k2P3/3P1PPP/2KR3R
Reprints: (8) Problem 124-126 03/1969
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2013-02-05 more...
55 - P0004402
Nikita M. Plaksin
(9) Problem 124-126 03/1969
P0004402
(13+14)
h#1
3 Lösungen
Keywords: 50 move rule, Castling, Non-standard material
Genre: h#, Retro
FEN: 2N1k2r/3pp3/6p1/4Q2N/5P1q/1P2K1Pr/b1PPPPr1/1BRrrrbn
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
56 - P0004403
Nikita M. Plaksin
(10) Problem 124-126 03/1969
P0004403
(15+14)
h#1
Duplex
Keywords: 50 move rule, Castling, Non-standard material
Genre: h#, Retro
FEN: K1n1k2r/p1ppp2p/r5p1/1r2Q2N/B1b2P2/PP3pP1/R1PPPP2/n4RB1
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
57 - P0004404
Nikita M. Plaksin
(11) Problem 124-126 03/1969
P0004404
(15+14)
#3
Keywords: Castling, 50 move rule, Non-standard material
Genre: Retro
FEN: 4k2r/b1pppp1p/Kp6/p4N2/2P3QB/1P4PP/r1PPPPRR/nB2r2n
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
58 - P0004414
Bengt Rudolf Giöbel
Eskilstuna-Kuriren 1932
P0004414
(15+15)
Schwarz und Weiß nehmen ihren 50. Zug zurück, so daß sie remis nach der 50-Züge-Regel machen
b) Ta1-b1, Tb8-a8, Sg8-f6
Keywords: 50 move rule, Help retractor, Parity Argument
Genre: Retro
FEN: 1rbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/R1BQKBNR
Reprints: (4) Problem 127-132 09/1969
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-10-25 more...
59 - P0004439
Nikita M. Plaksin
(5) Problem 141-143 08/1971
P0004439
(15+15)
=
Keywords: 50 move rule
Genre: Retro
FEN: NRr2r1n/bRpppp1B/pp4pk/6p1/6P1/3P2Pq/PPPnPP1B/6KN
Input: Gerd Wilts, 1995-06-03
60 - P0004440
Nikita M. Plaksin
Schachmatnaja Moskwa 1969
Spezialpreis
P0004440
(10+15)
=
R: 1. Tc8-b8 Lb8-a7 2. Lh7-g8 La7-b8 3. Kf8-e8 Lb8-a7 4. Kg7-f8 La7-b8 5. Th8-c8 Lb8-a7 6. Kf8-g7 La7-b8 7. Ke8-f8 Lb8-a7 8. Kd8-e8 La7-b8 9. Kc8-d8 Lb8-a7 10. Kb7-c8 La7-b8 11. Kc6-b7 Lb8-a7 12. Kd6-c6 La7-b8 13. Ke6-d6 Lb8-a7 14. Kf5-e6 La7-b8 15. Kg4-f5 Lb8-a7 16. Kh3-g4 La7-b8 17. Kg2-h3 Lb8-a7 18. Kf1-g2 La7-b8 19. Ke1-f1 Lb8-a7 20. Kd1-e1 La7-b8 21. De1-d2 Lb8-a7 22. Dh4-e1 La7-b8 23. Dh6-h4 Lb8-a7 24. Lf2-g1 La7-b8 25. Lg3-f2 Lb8-a7 26. Le5-g3 La7-b8 27. Tg1-h1 Lb8-a7 28. Tg3-g1 La7-b8 29. Ke1-d1 Lb8-a7 30. Kf1-e1 La7-b8 31. Kg2-f1 Lb8-a7 32. Kh3-g2 La7-b8 33. Kg4-h3 Lb8-a7 34. Kf5-g4 La7-b8 35. Ke6-f5 Lb8-a7 36. Kd6-e6 La7-b8 37. Kc6-d6 Lb8-a7 38. Kb7-c6 La7-b8 39. Kc8-b7 Lb8-a7 40. Kd8-c8 La7-b8 41. Ke8-d8 Lb8-a7 42. Kf8-e8 La7-b8 43. Kg7-f8 Lb8-a7 44. Tc8-h8 La7-b8 45. Kg8-g7 Lb8-a7 46. Df8-h6 La7-b8 47. Dd8-f8 Lb8-a7 48. Kf8-g8 La7-b8 49. Ke8-f8 Lb8-a7 50. Lg7-e5 La7-b8 51. Lf8-g7 Lb8-a7 52. g7-g6 La7-b8 53. Le4-h7 Lb8-a7 54. Lb7-e4 La7-b8 55. Tb8-c8 g4-g5 56. Lc8-b7 f2xSe3 57. b7-b6
play all play one stop play next play all
AV: 1.d3 a6 2.Fe3 Th3 3.Fc5 Ce3 4.Fa7 b6 5.g5 Fb7 6.fxe3 Tc8 7.Fb8 Tg3 8.Fa7 Fe4 9.Fb8 Fh7 10.Fa7 g6 Dernier coup de pion. 11.Fb8 Fg7 12.Fa7 Fe5 13.Fb8 Rf8 14.Fa7 Rg7 15.Fb8 Dh8 16.Fa7 Tg8 17.Fb8 Rf8 18.Fa7 Re8 19.Fb8 Rd8 20.Fa7 Rc8 21.Fb8 Rb7 22.Fa7 Rc6 23.Fb8 Rd5 24.Fa7 Re6 25.Fb8 Rf5 26.Fa7 Rg4 27.Fb8 Rh3 28.Fa7 Rg2 29.Fb8 Rf1 30.Fa7 Tg1 31.Fb8 Fg3 32.Fa7 Df6 33.Fb8 Re1 34.Fa7 Rd1 35.Fb8 Df1 36.Fa7 De1 37.Fb8 Dd2 38.Fa7 Th1 39.Fb8 Ff2 40.Fa7 Fg1 41.Fb8 Re1 42.Fa7 Rf2 43.Fb8 Rg2 44.Fa7 Rh3 45.Fb8 Rg4 46.Fa7 Rf5 47.Fb8 Re5 48.Fa7 Rd5 49.Fb8 Rc6 50.Fa7 Rb7 51.Fb8 Rc8 52.Fa7 Rd8 53.Fb8 Re8 54.Fa7 Rf8 55.Fb8 Rg7 56.Fa7 Tc8 57.Fb8 Rf8 58.Fa7 Re8 59.Fb8 Fg8 60.Fa7 Tb8 . Les Blancs peuvent réclamer la nulle (règle des 50 coups). (2005-06-05)
AV: Position de départ : Ra1, Fc1, Pa2,b2,c3,d2,e2,f2,g4,h2 (10)/Re8, Dd8, Tb8 et h8, Fc8 et f8, Ca8 et d5, Pa7, b7, c2, c7, d7, e7, f7 et g7 (16). (2005-06-05)
James Malcom: I managed a full shortest proof game after reading the explaining on jankohttps://www.janko.at/Retros/Masterworks/Part1.htm

It turns out that Black's 19th and 20th are critical tempo moves so that Black can play Rb8 onto the Bishop's square.


1. c3 a6 2. Qc2 Nc6 3. Qg6 hxg6 4. Nf3 Na5 5. Nh4 Nb3 6. Nf5 gxf5 7. g4 Nxa1 8.
Bg2 Nc2+ 9. Kd1 Nb4 10. Be4 fxe4 11. Rg1 Nd5 12. Rg3 Nb6 13. Rd3 Nh6 14. Na3 Nf5
15. Kc2 Rb8 16. Kb1 exd3 17. Nc2 dxc2+ 18. Ka1 Na8 19. d3 Rh3! 20. Be3 Rg3! 21.
Bb6 Ne3 22. Ba7 b6 23. fxe3 Bb7 24. g5 Rc8 25. Bb8 Be4 26. Ba7 Bh7 27. Bb8 g6
28. Ba7 Bg7 29. Bb8 Be5 30. Ba7 Kf8 31. Bb8 Kg8 32. Ba7 Qf8 33. Bb8 Qh6 34. Ba7
Kg7 35. Bb8 Rh8 36. Ba7 Kf8 37. Bb8 Ke8 38. Ba7 Kd8 39. Bb8 Kc8 40. Ba7 Kb7 41.
Bb8 Kc6 42. Ba7 Kd6 43. Bb8 Ke6 44. Ba7 Kf5 45. Bb8 Kg4 46. Ba7 Kh3 47. Bb8 Kg2
48. Ba7 Kf1 49. Bb8 Ke1 50. Ba7 Kd1 51. Bb8 Rg1 52. Ba7 Rh1 53. Bb8 Bg3 54. Ba7
Bf2 55. Bb8 Bg1 56. Ba7 Qh4 57. Bb8 Qe1 58. Ba7 Qd2 59. Bb8 Ke1 60. Ba7 Kf1 61.
Bb8 Kg2 62. Ba7 Kh3 63. Bb8 Kg4 64. Ba7 Kf5 65. Bb8 Ke5 66. Ba7 Kd5 67. Bb8 Kc6
68. Ba7 Kb7 69. Bb8 Kc8 70. Ba7 Kd8 71. Bb8 Ke8 72. Ba7 Kf8 73. Bb8 Kg7 74. Ba7
Rc8 75. Bb8 Kf8 76. Ba7 Ke8 77. Bb8 Bg8 78. Ba7 Rb8 (2020-08-13)
James Malcom: The animation is now complete. (2020-08-14)
Henrik Juel: Thanks, James
The further retroplay is relatively easy, e.g.
Retract sTg3 to h8, sSe3 to g8, wLa7 to c1, d2-d3, h7xSg6xSf5xDe4xTd3xLc2
[wTa1] was captured in its corner (2020-08-15)
comment
Keywords: 50 move rule
Genre: Retro
FEN: nr2k1b1/B1pppp2/pp4p1/6P1/8/2PPP3/PPpqP2P/K5br
Reprints: (6) Problem 141-143 08/1971
(6) Die Schwalbe 67 02/1981
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-08-14 more...
61 - P0004441
Nikita M. Plaksin
(7) Problem 141-143 08/1971
P0004441
(14+14)
=
Keywords: 50 move rule
Genre: Retro
FEN: NR1rq1rN/bRppppKP/kp4pp/2p5/2P1b2P/1P6/P2PP1P1/5B2
Input: Gerd Wilts, 1995-06-03
62 - P0004442
Nikita M. Plaksin
(8) Problem 141-143 08/1971
P0004442
(15+15)
=
Keywords: 50 move rule
Genre: Retro
FEN: K3rrBN/ppP1pp1P/2npp1p1/7b/6PR/6pR/PPPbPPkB/1q5N
Input: Gerd Wilts, 1995-06-03
63 - P0004443
Nikita M. Plaksin
(9) Problem 141-143 08/1971
P0004443
(13+14)
=
Keywords: 50 move rule
Genre: Retro
FEN: 2bqQr1r/1pppppp1/2R3p1/2K4B/6P1/1P4P1/PRPPPP2/2k3bn
Input: Gerd Wilts, 1995-06-03
64 - P0004494
Andrey Frolkin
6016v Die Schwalbe 148 08/1994
P0004494
(13+13)
Wer ist am Zug?
Keywords: 50 move rule, Sliding block puzzle, Promotion (TTTt), Non-standard material
Genre: Retro
FEN: k1BBR1Rr/ppKPbbRR/3pPrrR/4pppp/8/8/5PPP/8
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
65 - P0004584
Nikita M. Plaksin
(1) Problem 188-193 05/1979
P0004584
(14+14)
#1
1. Te8#? 1. Ta5#!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: nB5k/R1ppRppp/Kp2p3/1rp5/n1P5/1BrP1b2/PPP2PPP/N7
Input: Gerd Wilts, 1995-06-03
66 - P0004585
Nikita M. Plaksin
(2) Problem 188-193 05/1979
P0004585
(14+15)
#1
1. 0-0#? 1. Kf2#
play all play one stop play next play all
Keywords: 50 move rule, Castling, Non-standard material
Genre: Retro
FEN: N5b1/rrpppp1R/pp3PpB/b4p2/Nq5n/6P1/PRPPP2P/2k1K2R
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
67 - P0004586
Nikita M. Plaksin
(3) Problem 188-193 05/1979
P0004586
(16+13)
#1
1. Dxg2#? 1. Dxg7#
play all play one stop play next play all
Keywords: 50 move rule, Promotion, Non-standard material
Genre: Retro
FEN: N1R3KN/BRppppRr/1p4pp/4q3/1P2Q3/brP5/1PP1PPbP/5Bk1
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
68 - P0004587
Nikita M. Plaksin
(4) Problem 188-193 05/1979
P0004587
(12+16)
#1 (wer?)
1. ... Sxd2#
1. ... Sg3 Matt oder Remis?

Beispielauflösung mit Schwarz am Zug (mri):
R: 1. Ta7-a6 Tb1-c1 2. Ta6-a7 Dc1-d1 3. Ta7-a6 Td1-e1 4. Ta6-a7 Ke1-f2 5. Kg1-h1 Sg3-f1 6. Kh1-g1 Se4-g3 7. Kg1-h1 Sg5-e4 8. Kh1-g1 Sh3-g5 9. Ta7-a6 Sg1-h3 10. Ta6-a7 Kf2-e1 11. Ta7-a6 Tf1-d1 12. Ta6-a7 Ke1-f2 13. Ta7-a6 Tf3-f1 14. Tb7-a7 Kf1-e1 15. Ta7-b7 De1-c1 16. Ta6-a7 Dh4-e1 17. Ta7-a6 Th3-f3 18. Ta6-a7 Kf2-f1 19. Ta7-a6 Tf1-b1 20. Ta6-a7 Ke1-f2 21. Ta7-a6 Tf3-f1 22. Ta6-a7 Tg3-f3 23. Ta7-a6 Kf2-e1 24. Tb1-b2 Sf3-g1 25. Tg1-b1 Df6-h4 26. Ta6-a7 Db2-f6 27. Ta7-a6 Dc1-b2 28. Ta6-a7 Df1-c1 29. Ta7-a6 Ke1-f2 30. Ta6-a7 Kd1-e1 31. Ta7-a6 Kc1-d1 32. Ta6-a7 Kb2-c1 33. Ta7-a6 Ka3-b2 34. Ta6-a7 Kb4-a3 35. Ta7-a6 Kc5-b4 36. Ta6-a7 Kc6-c5 37. Ta7-a6 Sh4-f3 38. Ta6-a7 Df3-f1 39. Tb1-g1 Kb7-c6 40. Tc1-b1 Kc8-b7 41. Tb1-c1 Kd8-c8 42. Tc1-b1 Ke8-d8 43. Tb1-c1 Db7-f3 44. Ta7-a6 Dc8-b7 45. Ta6-a7 Dd8-c8 46. Ta7-a6 Lh7-g8 47. Ta6-a7 Le4-h7 48. Ta7-a6 Lb7-e4 49. Ta6-a7 Lc8-b7 50. Ta7-a6 b7-b6
play all play one stop play next play all
Mario Richter: Das Diagramm ist offensichtlich verdruckt (s. sBBa5a6b7c7). Wie lautet die korrekte Stellung? (2010-01-23)
TBr: Habe die Stellung korrigiert laut Problem 188-189. (2020-03-13)
Henrik Juel: Thanks, Thomas
Black captured [Lf1] on f1 and hxgxfxe
Retracting e4-e3 is illegal as [Ph7] captured [Lc1] on a dark square
Outline of retroplay:
Retract -1.Ta7-a6, sTDT to the left, sKe1-f2, wKg1-h1, sSg3-f1, wKh1-g1, sSg3 to g1, extract sTDT via f1 and f3, sSh3-g1, wTb2 to g1, sD to f1, sKf2 to e8, sDf1 to d8, sLg8 to c8, and finally probably -50... b7-b6 to avoid draw by the 50 move rule (2020-03-13)
Mario Richter: Henrik, I don't think that "-50... b7-b6 to avoid draw by the 50 move rule" is the point of this problem. I think the author's intention was to raise the question what has higher priority: 50-moves-rule or checkmate.
So 1. ... Sxd2 mates, the question is, if the non-capturing non-pawn move 1. ... Sd2 too is checkmate.
Furthermore, I do not like the stipulation: White has no mating move, so the question "#1 (wer?)" doesn't make any sense to me. Imho a better stipulation would be "#1, How many solutions?" (2020-03-26)
Henrik Juel: Thanks for providing a retroplay, Mario
You are probably right about the author intention; I think that Plaksin would argue that 1... Sg3 stops the game immediately, with draw by the 50 move rule
The stipulation may have been translated incorrectly from serbo-kroatian (2020-03-27)
comment
Keywords: 50 move rule
Genre: Retro
FEN: n4bb1/2ppppp1/Rp6/p7/5P2/1P2p3/PRPPPkPP/N1rqrn1K
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-03-26 more...
69 - P0004588
Nikita M. Plaksin
(5) Problem 188-193 05/1979
P0004588
(14+14)
#1 (wer?)
1. Tg8,Txf7#
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: Rrr1nk1N/ppP2pRK/2pP2pp/3pp2n/5P2/6P1/PP2PP2/5bBN
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2018-03-27 more...
70 - P0004589
Nikita M. Plaksin
(6) Problem 188-193 05/1979
P0004589
(14+16)
#1?
1. Da1#?
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 6bn/2pppp1P/1p4p1/BP4bB/kp4P1/6p1/PKPPPPRN/3qrrRn
Input: Gerd Wilts, 1995-06-03
71 - P0004590
Nikita M. Plaksin
(7) Problem 188-193 05/1979
P0004590
(15+13)
#1 (wer?)
1. Txf1#
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 8/ppp2ppp/4p3/4p3/1P3P2/1P2n1P1/1kPPPPrb/NBRQKRrN
Input: Gerd Wilts, 1995-06-03
72 - P0004591
Nikita M. Plaksin
(8) Problem 188-193 05/1979
P0004591
(15+13)
#1?
1. Txc1#?
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 8/ppp2ppp/3p4/3p4/2P3P1/1P1n2P1/brPPPPk1/NrRKQRBN
Input: Gerd Wilts, 1995-06-03
73 - P0004592
Nikita M. Plaksin
(9) Problem 188-193 05/1979
P0004592
(16+14)
#1?
1. Txg8#?
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: r1nKQRnk/p1pppp1p/1p5P/6pR/2P4B/1P4P1/B1PPPP1r/N5bN
Input: Gerd Wilts, 1995-06-03
74 - P0004593
Nikita M. Plaksin
(10) Problem 188-193 05/1979
P0004593
(16+14)
#1?
1. Txg1#!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: Q1K3nN/ppprpprp/3p2p1/1P6/5B2/1P5P/b1PPPP1P/NB1R1Rnk
Input: Gerd Wilts, 1995-06-03
75 - P0004594
Nikita M. Plaksin
(11) Problem 188-193 05/1979
P0004594
(13+14)
#2
1. De3? Ke1!
1. f3? Ke1!
1. Tg1!+ Kxe2 2. De3#
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 1r2qb2/1ppppppR/rp6/B7/1P1Q4/1P4P1/2PPPPRP/nb3k1K
Input: Gerd Wilts, 1995-06-03
76 - P0004595
Nikita M. Plaksin
(12) Problem 188-193 05/1979
P0004595
(14+13)
#2
1. Df2+ Kh1 2. Kd2#! (2. 0-0-0#?)
play all play one stop play next play all
Keywords: 50 move rule, Promotion, Castling, Non-standard material
Genre: Retro
FEN: 1n1BRRRN/1PrpppRB/ppp3p1/2Q2p2/7n/6Pr/P3P1k1/R3K3
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
77 - P0004596
Nikita M. Plaksin
(13) Problem 188-193 05/1979
P0004596
(15+12)
#2
1. Dg5+ Kxc2 (Kxe2) 2. Dc1 (De3)#
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: 2K3bN/ppprppr1/3p2p1/7B/6PQ/6Pr/PPPkPP1B/RR5N
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
78 - P0004597
Nikita M. Plaksin
(14) Problem 188-193 05/1979
P0004597
(15+11)
#6
1. Db5+? 1. Dxa3!
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: Nb3K2/1r1prppp/1p2p3/B7/QP6/rP6/B1PPkPPP/N5RR
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
79 - P0004598
Nikita M. Plaksin
(15) Problem 188-193 05/1979
P0004598
(16+11)
#2
1. Td1+? 1. b3+! Db2 2. Lxb2#
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: N5K1/prpPrppp/1p2p3/8/1R6/B1QPPN2/PPPRP1P1/1qk2B2
Input: Gerd Wilts, 1995-06-03
80 - P0004599
Nikita M. Plaksin
(16) Problem 188-193 05/1979
P0004599
(14+16)
#2
1. Tb1+? Remis!

1. ... Dxg2+! 2. Kxh6 Dg6#
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: nb3r1r/P1ppppKp/Np5p/B7/1P1N4/1p2P2b/1RPPRPPP/n4k1q
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-10-08 more...
81 - P0004600
Nikita M. Plaksin
(17) Problem 188-193 05/1979
P0004600
(12+13)
#2?
Schwarz am Zug
1. Txf2+! Ke3 2. Tfxf1#
play all play one stop play next play all
Keywords: 50 move rule, Promotion, Non-standard material
Genre: Retro
FEN: 6b1/p2p1pp1/5p2/5p1N/P4P2/1P3KPr/1PkPPP2/2BRrrbn
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
82 - P0004601
Nikita M. Plaksin
(18) Problem 188-193 05/1979
P0004601
(14+14)
#2?
1. Lg4+?
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 5b2/2ppppp1/1p6/pQ5B/2P5/1P3PPk/b1PPPprP/n2KRRrN
Input: Gerd Wilts, 1995-06-03
83 - P0004602
Nikita M. Plaksin
(19) Problem 188-193 05/1979
P0004602
(15+13)
#2?
1. Sb3+? remis
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 2B1rb2/pKppp1p1/p1R5/8/5P1P/r2P1p2/PPP1PP1p/qkNQ1RB1
Input: Gerd Wilts, 1995-06-03
84 - P0004603
Nikita M. Plaksin
(20) Problem 188-193 05/1979
P0004603
(15+13)
#2?
1. Sg3+? remis
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 5BKn/2ppppR1/pp4pr/7p/8/1P2PQ2/b1PP1PPP/NB2RNkr
Input: Gerd Wilts, 1995-06-03
85 - P0004604
Nikita M. Plaksin
(21) Problem 188-193 05/1979
P0004604
(16+15)
#2?
1. Td1+? remis
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 1QK3bn/ppprpp1r/1R1p2P1/6p1/7b/3P1BP1/PPPRPP1p/qk2N1BN
Input: Gerd Wilts, 1995-06-03
86 - P0004605
Nikita M. Plaksin
(22) Problem 188-193 05/1979
P0004605
(14+15)
#2?
1. Sd2+? 1. Sa3+? remis
1. Sxc3? Kxb2!
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: 2K3bn/ppprpp1B/3p2p1/5p2/R7/1BrP2P1/PPP1PP1b/kNR3Bn
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
87 - P0004606
Nikita M. Plaksin
(23) Problem 188-193 05/1979
P0004606
(16+13)
#3
1. Dh1+? Kg4 2. Dh3+? remis
1. Dh2#! Kg4 2. f3+! Kf5 3. g4#
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: 7B/p2pp2p/1p1n1pq1/3K2b1/N1P4k/NPp5/BrPPPPP1/rRR2BQ1
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
88 - P0004607
Nikita M. Plaksin
(24) Problem 188-193 05/1979
P0004607
(14+11)
#3?
1. Sf3+?
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: Bb3KQ1/p1Pprppp/2ppp3/8/8/3P4/PPPRPP1P/2k3NR
Input: Gerd Wilts, 1995-06-03
89 - P0004608
Nikita M. Plaksin
(25) Problem 188-193 05/1979
P0004608
(13+15)
#4
1. Thxg1+? 1. xa8=D(L)+!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 1bb2r1r/P1ppppKp/7p/p5N1/6n1/1P5P/1pPPPPkP/N4RqR
Input: Gerd Wilts, 1995-06-03
90 - P0004609
Nikita M. Plaksin
(26) Problem 188-193 05/1979
P0004609
(15+14)
#4
1. Tg5+? 1. Txh4+!
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
FEN: 1K1N1B2/pp1rpprp/3p1b2/7k/2P1Q1Rn/1Pp3PP/B1PPPP1R/6rn
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2004-08-09 more...
91 - P0004610
Nikita M. Plaksin
(27) Problem 188-193 05/1979
P0004610
(15+14)
#4
1. Kg8? 1. b4!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: NN2k2n/p2ppp1K/1pp3pQ/6p1/6P1/1P4P1/B1PPPP2/1brrRRBn
Input: Gerd Wilts, 1995-06-03
92 - P0004611
Nikita M. Plaksin
(28) Problem 188-193 05/1979
P0004611
(14+15)
+
1. Td8+? Dc8! 1. fxe6!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: k5Bn/pppRpp2/3pq1pK/5P2/5prP/PP4Br/b1PP1PPR/N6n
Reprints: (C) feenschach 154 2004
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2005-01-09 more...
93 - P0004612
Nikita M. Plaksin
(29) Problem 188-193 05/1979
P0004612
(11+15)
=
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: NB5n/2ppppkb/pp1b2p1/3q2P1/P7/rP1P4/RPprPP2/K7
Input: Gerd Wilts, 1995-06-03
94 - P0004613
Nikita M. Plaksin
(30) Problem 188-193 05/1979
P0004613
(11+16)
=
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: QK2rb2/ppp1p1p1/1n1pp3/8/PR2b3/1Pr1P3/2PpRPPP/n4kq1
Input: Gerd Wilts, 1995-06-03
95 - P0004614
Nikita M. Plaksin
(31) Problem 188-193 05/1979
P0004614
(13+14)
=
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 3K1b1r/prppp1pp/1p6/8/8/2PPP3/P1pP1PPP/RbBR1Nkq
Input: Gerd Wilts, 1995-06-03
96 - P0004615
Nikita M. Plaksin
(32) Problem 188-193 05/1979
P0004615
(13+14)
=
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: QK2rb2/ppp1p1p1/1n1pp3/3R1p2/5P2/3P2Pb/PPPRPP1B/1qk5
Input: Gerd Wilts, 1995-06-03
97 - P0004616
Nikita M. Plaksin
(33) Problem 188-193 05/1979
P0004616
(12+16)
+?
1. Tg2+! Lf1 remis? +!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: n3Kb1r/Brpppppp/1p6/8/8/3P2Pb/PPPRpPRP/qNk4n
Input: Gerd Wilts, 1995-06-03
98 - P0004617
Nikita M. Plaksin
(34) Problem 188-193 05/1979
P0004617
(12+16)
=
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: 6b1/ppp1pp1B/2k1p1p1/8/5P2/3PprP1/PPPrPqRP/RnK2nb1
Input: Gerd Wilts, 1995-06-03
99 - P0004618
Nikita M. Plaksin
(35) Problem 188-193 05/1979
P0004618
(13+15)
=
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: NbbqkrRn/1BppppRr/Kp4pp/2p5/8/8/PPPPPP1P/2B5
Input: Gerd Wilts, 1995-06-03
100 - P0004619
Nikita M. Plaksin
(36) Problem 188-193 05/1979
P0004619
(14+15)
=
1. Lb1 remis

R: 1. Lb1-a2 Sc6-b8 2. Ka6-b7 Tb8-c8 3. La2-b1 Tb7-b8 4. Lb1-a2 Db8-d8 5. La2-b1
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
FEN: NnrqkrRn/bKppppRb/1p4p1/1p6/1P6/1P3PP1/B1PPP2P/N7
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2020-08-13 more...
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