Die Schwalbe

94 problem(s) found in 1234 milliseconds (displaying 94 problem(s)). [(a='plaksin') AND K='50-Züge-Regel']

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. (2009-4-23)
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 ... (2010-4-25)
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. (2010-4-26)
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. (2017-10-5)
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 (2017-10-5)
Henrik Juel: tiny typo: Black captured hxg, not hxLg (2017-10-6)
A.Buchanan: I agree with your count :D (2017-10-6)
comment
Keywords: 50 move rule, Conditional problem
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2017-10-6 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 S-h6 3. Sc8-b6 S- 4. Sb6-c8 S- ... 49. Sc8-b6 S- 50. Sb6-c8 S-! Sc8-b6; axb6ep#
play all play one stop play next play all
Keywords: 50 move rule, En passant, Defensive Retractor, Type Proca
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-28 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
Reprints: H28 FIDE Album 1986-1988 1995
Input: Gerd Wilts, 1995-6-3
Last update: Nikolai Beluhov, 2011-5-6 more...
4 - 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. (2004-8-17)
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 (2004-8-17)
comment
Keywords: 50 move rule, Draw by repetition, Defensive Retractor, Type Proca
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-28 more...
5 - 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. (2003-1-15)
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. (2003-4-16)
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# (2003-4-28)
comment
Keywords: 50 move rule, a posteriori (AP), Castling (sg)
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-12-23 more...
6 - 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
Reprints: feenschach 30 10/1975
feenschach 38 04-06/1977
618 FIDE Album 1971-1973 1978
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-8-19 more...
7 - 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) (2013-2-13)
Henrik Juel: The diagram may be correct.
The pawn position can be explained without promotions:
White captured axb and exd; Black captured a7xSb6xSc5xPd3 (2013-2-13)
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 (2013-2-13)
comment
Keywords: 50 move rule
Genre: Retro
Reprints: (B) Die Schwalbe 27 06/1974
(D5) feenschach 27 04/1975
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2013-2-13 more...
8 - 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 (2010-6-25)
comment
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
9 - 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 (2005-6-3)
comment
Keywords: 50 move rule, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-10 more...
10 - 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
Input: Gerd Wilts, 1995-6-3
11 - 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) (2005-6-4)
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. (2005-6-4)
comment
Keywords: 50 move rule, Help retractor, Non-standard material, Promotion (L)
Genre: Retro
Reprints: feenschach 44 12/1978
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-10 more...
12 - 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. (2004-8-17)
comment
Keywords: 50 move rule, Defensive Retractor, Type Proca
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-28 more...
13 - 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. (2002-4-3)
comment
Keywords: 50 move rule, Defensive Retractor, Type Proca
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-28 more...
14 - 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. (2011-1-31)
comment
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2000-10-7 more...
15 - 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 (2011-2-15)
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#. (2011-2-15)
comment
Keywords: 50 move rule
Genre: Retro
Reprints: Problem 1980
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2014-5-20 more...
16 - 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)
comment
Keywords: 50 move rule, Castling (wg)
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Olaf Jenkner, 2012-11-14 more...
17 - P0004361
Nikita M. Plaksin
2680 Problem 109-111 10/1967
P0004361
(15+15)
#2
1. Dxb8+ (Dc8+? remis!)
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
18 - P0004364
Nikita M. Plaksin
Biulletin ZSK 1968
P0004364
(15+14)
#3
senkrecht gespiegelt P0004395.
comment
Keywords: 50 move rule
Genre: Retro
Reprints: 2776 Problem 112-119 02/1968
(1) Problem 124-126 03/1969
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1999-11-5 more...
19 - P0004395
Nikita M. Plaksin
(2) Problem 124-126 03/1969
P0004395
(15+14)
#3
senkrecht gespiegelt P0004364
comment
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1999-11-5 more...
20 - P0004396
Nikita M. Plaksin
(3) Problem 124-126 03/1969
P0004396
(15+15)
#3
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
21 - 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 (2008-11-2)
comment
Keywords: 50 move rule, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2017-3-22 more...
22 - 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 (2008-11-2)
comment
Keywords: Castling, 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2017-3-22 more...
23 - 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
Reprints: (6) Problem 124-126 03/1969
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2011-7-11 more...
24 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
25 - 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 (2013-2-4)
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 (2013-2-5)
comment
Keywords: 50 move rule, Castling, Help retractor, Non-standard material
Genre: Retro
Reprints: (8) Problem 124-126 03/1969
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2013-2-5 more...
26 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
27 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
28 - P0004404
Nikita M. Plaksin
(11) Problem 124-126 03/1969
P0004404
(15+14)
#3
Keywords: Castling, 50 move rule, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
29 - P0004439
Nikita M. Plaksin
(5) Problem 141-143 08/1971
P0004439
(15+15)
=
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
30 - P0004440
Nikita M. Plaksin
Schachmatnaja Moskwa 1969
Spezialpreis
P0004440
(10+15)
=
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). (2005-6-5)
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). (2005-6-5)
comment
Keywords: 50 move rule
Genre: Retro
Reprints: (6) Problem 141-143 08/1971
(6) Die Schwalbe 67 02/1981
Input: Gerd Wilts, 1995-6-3
31 - P0004441
Nikita M. Plaksin
(7) Problem 141-143 08/1971
P0004441
(14+14)
=
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
32 - P0004442
Nikita M. Plaksin
(8) Problem 141-143 08/1971
P0004442
(15+15)
=
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
33 - P0004443
Nikita M. Plaksin
(9) Problem 141-143 08/1971
P0004443
(13+14)
=
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
34 - 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
Input: Gerd Wilts, 1995-6-3
35 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
36 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
37 - P0004587
Nikita M. Plaksin
(4) Problem 188-193 05/1979
P0004587
(12+16)
#1 (wer?)
1. Sg3 (Sxd2)#
play all play one stop play next play all
Mario Richter: Das Diagramm ist offensichtlich verdruckt (s. sBBa5a6b7c7). Wie lautet die korrekte Stellung? (2010-1-23)
comment
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
38 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-3-27 more...
39 - 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
Input: Gerd Wilts, 1995-6-3
40 - 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
Input: Gerd Wilts, 1995-6-3
41 - 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
Input: Gerd Wilts, 1995-6-3
42 - 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
Input: Gerd Wilts, 1995-6-3
43 - 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
Input: Gerd Wilts, 1995-6-3
44 - 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
Input: Gerd Wilts, 1995-6-3
45 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
46 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
47 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
48 - 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
Input: Gerd Wilts, 1995-6-3
49 - P0004599
Nikita M. Plaksin
(16) Problem 188-193 05/1979
P0004599
(14+16)
#2
1. Tb1+? 1. Dxg2!
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
50 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
51 - 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
Input: Gerd Wilts, 1995-6-3
52 - 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
Input: Gerd Wilts, 1995-6-3
53 - 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
Input: Gerd Wilts, 1995-6-3
54 - 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
Input: Gerd Wilts, 1995-6-3
55 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
56 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
57 - 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
Input: Gerd Wilts, 1995-6-3
58 - 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
Input: Gerd Wilts, 1995-6-3
59 - 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
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
60 - 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
Input: Gerd Wilts, 1995-6-3
61 - 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
Reprints: (C) feenschach 154 2004
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-1-9 more...
62 - 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
Input: Gerd Wilts, 1995-6-3
63 - 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
Input: Gerd Wilts, 1995-6-3
64 - 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
Input: Gerd Wilts, 1995-6-3
65 - 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
Input: Gerd Wilts, 1995-6-3
66 - 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
Input: Gerd Wilts, 1995-6-3
67 - 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
Input: Gerd Wilts, 1995-6-3
68 - 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
Input: Gerd Wilts, 1995-6-3
69 - P0004619
Nikita M. Plaksin
(36) Problem 188-193 05/1979
P0004619
(14+15)
=
1. Lb1 remis
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
70 - P0004620
Nikita M. Plaksin
(37) Problem 188-193 05/1979
P0004620
(14+15)
=
1. Ke1 remis
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
71 - P0004621
Nikita M. Plaksin
(39) Problem 188-193 05/1979
P0004621
(14+16)
=
1. Tg2 remis
play all play one stop play next play all
Keywords: 50 move rule, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
72 - P0004622
Nikita M. Plaksin
(40) Problem 188-193 05/1979
P0004622
(12+14)
Weiß nimmt 1 Zug zurück, dann =
R: 1. 0-0, remis!
play all play one stop play next play all
Keywords: 50 move rule, Castling, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
73 - P0004623
Nikita M. Plaksin
(41) Problem 188-193 05/1979
P0004623
(14+12)
Weiß nimmt 1 Zug zurück, dann #2
R: 1. 0-0-0, dann 1. Txc7! 1. Tb1+? 1. Ta4+? 1. Ld4?
play all play one stop play next play all
Keywords: 50 move rule, Castling, Help retractor, Promotion, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
74 - P0004624
Nikita M. Plaksin
(42) Problem 188-193 05/1979
P0004624
(16+14)
h#2?
1. Dxg2 Dxh7 2. Dxh2 Dxh2#?
1. Dxh2 Dxh7 2. Kh1 Dxh2#?
1. Kxg2 Dxg7+ 2. Kh3 Dg3#?
1. Dxg2 Dxh7 2. Kh1 Sg3#?
1. g6 (g5) De5 2. Kxg2 Dg3#?
remis!
play all play one stop play next play all
Keywords: 50 move rule
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
75 - P0004625
Nikita M. Plaksin
(43) Problem 188-193 05/1979
P0004625
(13+14)
#1?
Schwarz spielt ohne Springer
1. Sac3? Sdc3?
play all play one stop play next play all
Keywords: 50 move rule, Odds game, Non-standard material
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-9 more...
76 - P0004626
Nikita M. Plaksin
(44) Problem 188-193 05/1979
P0004626
(14+14)
#1?
Schwarz hat die Dame vorgegeben.
1. Sf4#?
play all play one stop play next play all
Keywords: 50 move rule, Odds game
Genre: Retro
Input: Gerd Wilts, 1995-6-3
77 - P0004627
Nikita M. Plaksin
(45) Problem 188-193 05/1979
P0004627
(14+14)
=
Sh8 ist umgewandelt
remis
play all play one stop play next play all
Keywords: 50 move rule, Conditional problem, Promotion
Genre: Retro
Input: Gerd Wilts, 1995-6-3
78 - P0004628
Nikita M. Plaksin
(46) Problem 188-193 05/1979
P0004628
(14+14)
Darf Weiß rochieren?
Die sD hat 3 Züge gemacht.
1. 0-0? remis!
play all play one stop play next play all
Keywords: 50 move rule, Conditional problem, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1997-3-20 more...
79 - P0004629
Nikita M. Plaksin
(47) Problem 188-193 05/1979
P0004629
(15+14)
#1?
1. Td1#?
play all play one stop play next play all
Keywords: 50 move rule
Genre: Retro
Input: Gerd Wilts, 1995-6-3
80 - P0004630
Nikita M. Plaksin
(48) Problem 188-193 05/1979
P0004630
(13+16)
Darf Weiß rochieren?
1. 0-0-0? remis!
play all play one stop play next play all
Keywords: 50 move rule, Castling
Genre: Retro
Input: Gerd Wilts, 1995-6-3
81 - P0004631
Nikita M. Plaksin
(49) Problem 188-193 05/1979
P0004631
(15+10)
#2
Tg8 ist der Königsturm
1. Kd7#? 1. Kxc7! Txd8 2. Txd8#
play all play one stop play next play all
Keywords: 50 move rule, Conditional problem
Genre: Retro
Input: Gerd Wilts, 1995-6-3
82 - P0004632
Nikita M. Plaksin
(50) Problem 188-193 05/1979
P0004632
(13+16)
Weiß nimmt 1 Zug zurück, dann =
Tf8 ist der Damenturm
R: 1. 0-0-0, remis!
play all play one stop play next play all
Keywords: 50 move rule, Castling, Help retractor
Genre: Retro
Input: Gerd Wilts, 1995-6-3
83 - P0006062
Johannes Manfred Wittlich
Nikita M. Plaksin

Stella Polaris 1972
P0006062
(16+14) cooked
Wer gewinnt?
b) Spiegelbild
SBD: Wieso cooked? (2012-12-16)
comment
Keywords: 50 move rule
Genre: Retro
Reprints: (2) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-7-16
Last update: Gerd Wilts, 2004-10-25 more...
84 - P0006412
Nikita M. Plaksin
Valery Liskovets

(36) Die Schwalbe 156, p. 228, 12/1995
Lob
P0006412
(12+15)
#1 vor 101
VRZ, Typ Proca
R: 1. b3-b4 Lc2-d1 2. Lg8-h7 Ld1-c2 3. Lh7-g8 Lc2-d1 4. Lg8-h7 Lb1-c2 5. Lh7-g8 La2-b1 6. Lg8-h7 Lb1-a2 7. Lh7-g8 Ld3-b1 8. Lg8-h7 Le4-d3 9. Lh7-g8 Lb1-e4 10. Lg8-h7 La2-b1 11. Lh7-g8 Lb1-a2 12. Lg8-h7 Ld3-b1 13. Lh7-g8 Le4-d3 14. Lg8-h7 Ld3-e4 15. Lh7-g8 Le4-d3 16. Lg8-h7 Ld5-e4 17. Lh7-g8 Lc4-d5 18. Lg8-h7 Le6-c4 19. Lh7-g8 Lc8-e6 20. Lg8-h7 Ld7-c8 21. Lh7-g8 Le8-d7 22. Lg8-h7 Lc6-e8 23. Lh7-g8 Ld5-c6 24. Lg8-h7 Lc4-d5 25. Lh7-g8 Le6-c4 26. Lg8-h7 Lc8-e6 27. Lh7-g8 Ld7-c8 28. Lg8-h7 Le8-d7 29. Lh7-g8 Lc6-e8 30. Lg8-h7 Ld5-c6 31. Lh7-g8 Lc4-d5 32. Lg8-h7 Le6-c4 33. Lh7-g8 Lc8-e6 34. Lg8-h7 Ld7-c8 35. Lh7-g8 Le8-d7 36. Lg8-h7 Lc6-e8 37. Lh7-g8 Ld5-c6 38. Lg8-h7 Lc4-d5 39. Lh7-g8 Le6-c4 40. Lg8-h7 Lc8-e6 41. Lh7-g8 Ld7-c8 42. Lg8-h7 Le8-d7 43. Lh7-g8 Lc6-e8 44. Lg8-h7 Le4-c6 45. Lh7-g8 Ld3-e4 46. Lg8-h7 Lc2-d3 47. Lh7-g8 Ld1-c2 48. Lg8-h7 Lc2-d1 49. Lh7-g8 Ld1-c2 50. Lg8-h7 h5xLg4 ... 100. Lg8-h7 h6-h5 101. Lh5-g4, dann 1. Txh3#
play all play one stop play next play all
Weißer Schlagfall: hxg, schwarze Schlagfälle: axb, cxb, gxf und hxg. Die beiden weißen BB a2 und c2 haben sich auf a8 und c8 umgewandelt, um als Schlagobjekte zu dienen. Die Rücknahme h5xLg6 ist illegal, da das Feld g6 weiß ist. Die Stellung kann also nur aufgelöst werden, indem Schwarz den Zug h5xLg4 oder h5xSg4 zurücknimmt. Diese Rücknahme möchte Schwarz aber so lange wie möglich rauszögern, da sie Weiß das Matt ermöglicht.
VL: Retro: 1. b3 Bc2 2.Bg8 B~ 3.Bh7 B~. B.Bishop has 13 squares
to visit; moreover, it can reach a2 only from b1 and d1 only
from c2. Therefore the longest route of B without visiting
any square more than twice with w.Bh7 and twice with Bg8
contains 49 moves. 49.Bh7 B~ 50.Bg8 h5*Bg4! (50...B~?? an
illegal draw by both the 50 move and 3-fold repetition rule)
51.Bh7 B~ 99.Bh7 B~ 100.Bg8 h6! (the only legal move)
101.Bh5 & 1.R*h3#.

(50...h5*Sg4? 51.Se5(f6) - & 1.R*h3#).
(50.h5*Bg6?? - the missing B. piece is the dark-squared Bishop) (2004-8-17)
comment
Keywords: 50 move rule, Draw by repetition, Defensive Retractor, Type Proca
Genre: Retro
Reprints: H7 FIDE Album Annexe 1995-1997 2004
Input: Gerd Wilts, 1996-6-12
Last update: Gerd Wilts, 2005-5-21 more...
85 - P0007473
Nikita M. Plaksin
Andrey Frolkin

5672 feenschach 1989
2. Preis
P0007473
(12+16)
ser-h#6
Elsässisches Circe
1. Tc2 2. Txd2[+wTa1] 3. Sxc4[+wBc2] 4. Sxa5[+wBa2] 5. Sc6 6. Sb8 b7#!
7. Kxb2[+wBb2] führt zu Diagramm A. Dazu gibt es folgende Retrogenese aus Diagramm B:
0. .. g6 1.Th1 (pendelt nun) Lg7 2.Lc3 3.Ld2 4.Lc1 5.Sf2 6.Se4 7.Sc5 8.Sb3 9.Kg2 10.Kf2 11.Td1 12.Ke1 13.Kd2 14.Te1 15.Kd1 16.Ld2 17.Sc1 18.Lc3 19.Kd2 20.Td1 21.Ke1 22.Kf2 23.Kg2 24.Kh3 25.Le1 26.Lf2 27.Td2 28.Sb3 29.Sd4 30.Sb5 31.Kg4 32.Kf5 33.Th1 Sc3+ 34.Kc1 Sd1 35.Tg1 Dh3 36.Th1 Dg2 37.Tb1 Lg1 38.Ta1 Df2 39.Tb1 De1 40.Ta1 Lf2 41.Tg1 Ke6 42.Tg2 Lg1 43.Tb1 Df2 44.Ta1 Sc3 45.Tb1 Kd6 46.Ta1 Kc6 47.Tb1 Kb7 48.Ta1 Sb5 49.Kb1 Sd4 50.Kc1 Sc6 REMIS!! 51.Kb1 Sb8 =Diagramm A.
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Die Lösung ist so unglaublich, daß wir ganz langsam dem mpk folgen, der sie als einziger durchschaute (alle anderen Löser fanden nur die 6-zügige Vorwärtszugfolge, wofür es 1P. gab, und behaupteten dann frech "matt, weil die Stellung nach Kxb7[Bb2] {offensichtlich} illegal ist"): "1. Heftiger Verdacht, daß das Matt durch Bb7 erfolgt, der aus Legalitätsgründen nicht geschlagen werden darf. Um das zu erreichen, muß a) b8 geblockt und b) b2 vom sS geräumt werden. 2. Der Versuch 1.Sa4? 2.Sc5 3.Se6 (oder Sb7) 4.Sd8 5.Sc6 6.Sb8 b7#?? scheitert, da sich nach 7.Kxb7[Bb2]! die Stellung als leicht auflösbar erweist. Das gleiche gilt für 1.Sxc4[Bc2]? 2.Sxa5[Ba2] 4.Sb8 b7(#??) 5.Kxb7[Bb2]. 3. Daher zunächst 1.Tc2! 2.Txd2[Ta1]. Der wT kann den wK jetzt nicht mehr vor Schachgeboten auf der 1. Reihe abschirmen und nimmt ihm auch noch ein wichtiges Ausweichfeld. Außerdem ist jetzt auch der sT fest hinter der wBB-Kette installiert, so daß nun 3.Sxc4[Bc2] 4.Sxa5[Ba2] 5.Sc6 6.Sb8 b7# durchschlägt, denn nach 7.Kxb7[Bb2] ergibt sich folgende Retroanalyse: 4. Der sBe3, der von h7 stammt, hat den schwarzfeldrigen wL geschlagen. S kann daher nicht e4-e3 zurücknehmen, sondern muß warten, bis W seinen Bf4 zurückzieht, um dann über f4 mit Entschlag des wL zurückzugehen. Dies geht jedoch erst, nachdem die sTT (über g3) ins Freie gelangt sind. Zuvor muß der wL noch nach f1 gebracht werden, was wiederum die vorausgehende Rückführung des sL nach f8 erfordert. W kann vorerst nur Kb1-c1 (bzw. Ta1-b1) pendeln. S überführt seinen Sb8 nach d1 (5.Sd1 Kc1) und setzt dann fort mit 6.De1 Kb1 7.Lf2 Tg1 8.Kc6 Th1 9.Lg1 Kc1 10.- 12.Df2-g2-h3 Kb1 13.Sf2 Kc1 14.Se4 Kb1 15.Sc5 Kc1 16.Lf2 Kb1 17.Sb3 Tg1 18.Sc1 Th1 19.Le1 Tg1 20.Td1 Th1 21.Lc3 Tg1, und jetzt kann der sL nach f8 zurück (??), wonach g7-g6 mit Freisetzung der weißfeldrigen Läufer folgen kann, aber danach ist die Illegalität der Stellung offensichtlich, da der sSf1 nicht mehr aus der wStellung herauskommt (auf d2 immer illegales Retroschach!). Hier hatte ich zunächst aufgehört, bis ich zufällig noch fand, daß mit Hilfe des schwarzfeldrigen sL doch eine Auflösung möglich ist, wobei aber der sK auch noch ins fremde Nest eindringen muß: 22.D(h5) Th1 ... 27.Kh3 Tg1 28.Kg2 Th1 29.Kf2 Tg1 30.Ke1 Th1 31.Kd2 Tg1 32.Te1 Th1 33.Kd1 (Ablösung für den Sc1) Tg1 34.Sb3 Th1 35.Sc5 36.Se4 37.Ld2 38.Lc1 39.Kd2 40.Td1 41.Ke1 42.Kf2 Th1 43.Te1 Tg1 44.Kg2 Th1 45.Kh3 Tg1 46.Sf2 47.Sd1 48.Ld2 49.Lc3, und jetzt kann der wK pendeln (b1/c1), so daß der sSf1 via d2 abziehen kann. Aber (50.Lg7 51.Lf8 52.g6-g7) er kommt zu spät!!! Retroremis wegen 50-Züge-Regel!! Unglaublich!!! Die Stellung nach Kxb7[Bb2] ist damit (partiegemäß!) zwar erspielbar, aber trotzdem (retroproblemmäßig) illegal, da (nur) hier die 50-Züge- Regel automatisch greift. Für mich ein überraschendes Manöver, mit dem der Sf1 doch noch flott gemacht werden kann, nachdem ich die Sache fast schon als zu offensichtlich abtun wollte." Wer "Plaksin" über dem Diagramm las, hätte das eigentlich ahnen können; NP beschäftigte sich schon ausgiebig mit Retros zur 50-Züge-Regel (zum Thema "Rochadelegalität und 50-Züge-Regel" war z.B. ein Aufsatz von ihm in "problem" 124-126, S. 1-9, zu lesen) und besitzt große Expertise und erstaunlichen Erfindungsreichtum im Komponieren solcher Probleme. mpk: 3,5/II
Keywords: Circe (Elsässisches), Series mover, 50 move rule, Alsatian
Genre: Retro, Fairies
Reprints: feenschach 115 01-09/1995
Input: Gerd Wilts, 1996-8-31
Last update: A.Buchanan, 2015-8-2 more...
86 - P0007759
Nikita M. Plaksin
3068 feenschach 50 04-06/1980
1. ehrende Erwähnung
P0007759
(13+13)
a) Zeige, daß nach der KBP (207 Züge) die w0-0 noch zulässig ist!
b) Wieviele Züge hintereinander geschahen ohne B-Zug oder Schlagfall?
50-Züge-Remis-Regel außer Kraft
TU=Wesir
NL=neue AL
comment
Keywords: 50 move rule, Castling, Non-Unique Proof Game
Pieces: tu = Wazir (WE)
Genre: Retro
Input: Gerd Wilts, 1996-9-2
Last update: A.Buchanan, 2014-5-21 more...
87 - P0008501
Nikita M. Plaksin
Valery Liskovets

3034 Mat (Belgrad) 11-12 1980
2. Preis
P0008501
(13+13)
#1 vor 293
VRZ, Typ Proca
Retro: 1. c4! Bd1! (the longest way!) 2. h2 a3 (2. ... Be2?? a retro-stalemate) 3. Ba2 Be2 ... 43. Ba2 Bh5(!) 44. Bb1 f4! (44. ... B-?? an illegal draw by a 3d repetition) 45. Ba2 B- 94. Bb1 a4! (94. ... B-?? a draw by the 50 moves rule) 95. Ba2 B- 144. Bb1 a5 (50 moves) 193. Ba2 B- 194. Bb1 a6 (50 moves) 243. Ba2 B- 244. Bb1 f5 (50 moves) 291. Ba2 B- 292. Bb1 d7xNe6/h7xNg6! (the only possibility! 292. ... B-?? would result in a draw by a 3d repetition) 293. Ba2 & Rxc7#/Nxe7# NxOT Retro: 1. h2? Bc4 (then threatening an illegal draw by a 3d repetition, Bl will force W to retro-move c4-c5 or b4xc5). B 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. For B there are 13 accessible squares altogether which form the light squares of a 5x5 board. 4x13=52>50, so that when bl P occupies f4, the 50 moves rule acts. When bl P occupies f5, only 12 squares are accessible for bl B with 4x12=48 moves (a corresponding route is evident). The most difficult analysis is required for the case bl Pf3. B can reach any corner (d1, d5, h1 and h5) only via the corresponding neibouring square (e2, etc). So, apart from the start and the finish, B can visit each corner only twice. Therefore the limit length of a route is 1 (the initial corner) + 4x8 + 2x4 (intermediate visits to corners) + 1 (the terminal corner) = 42. Here is a 42-move route ("waltz") of bl B (one of few possible proof games): 0. d1 1. e2 2. d1! 3. e2 4. f1 5. d3! 6. e4 7. d5 8. e4 9. d3 10. f5 11. g4 12. h5 13. g4 14. f5! 15. h3 16. g2 17. h1 18. g2 19. h3 20. f1 21. g2! 22. h1 23. g2 24. h3 25. f5! 26. d3 27. e4 28. d5 29. e4 30. d3 31. f1 32. e2 33. d1 34. e2 35. f1 36. h3 37. f5 38. g4 39. h5 40. g4 41. h5. (Genesis: Pa2xb3xc4, Bf1-a2, Pb2-b3, Pf2-f5, Pg7-g6xPf5, Pf7-f6, Pe2-e6xf7, Bc1-h8, Pa7-a6, Bf8-a7, Pb7-b6, Bc8-e4, Ke1-e8, Pg2-g7 and Pd7xNe6, Ph7xNg6 (in any order). (Pe2xd3xc4??))
play all play one stop play next play all
Keywords: 50 move rule, Draw by repetition, Defensive Retractor, Type Proca
Genre: Retro
Input: Gerd Wilts, 1996-12-14
Last update: Gerd Wilts, 2004-6-10 more...
88 - P0008511
Valery Liskovets
Nikita M. Plaksin

(9) feenschach 80 1986
P0008511
(14+8)
#89 AP (pRA)
I 1. Qxd7# II (AP-justification of Bl's turn to move) 0. ... dxc6! 1. b6! B- 50. Rh6 c5! (50. ... B-?? 51. Rh5 an illegal draw by the 50 moves rule!) 51. bxc5 Ba6! 52. ... . 86. Rh5 Ba6! 87. Rh6 Bd3! (87. ... Bb5?? an illegal draw due to a 3d repetition: only 9 squares are accessible for bl B; 4x9=36) 88. c6! 0-0-0! 89. a8Q# (87. ... g+h6 88. g+h6 0-0-0 89. a8Q#) B must guard c6 or b7, so that it has only 9 squares to visit: a6, d5, e4 f3, g2, h1, b5, a4 and c6. 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. AP after Keym.
play all play one stop play next play all
Keywords: 50 move rule, a posteriori (AP), Castling
Genre: Retro
Input: Gerd Wilts, 1996-12-14
Last update: Gerd Wilts, 1997-3-20 more...
89 - P0008518
Valery Liskovets
Nikita M. Plaksin

Shakhmaty (Baku) 16 1991
Spezialpreis
P0008518
(13+15)
#1 vor 850
VRZ, Typ Proca
Retro: 1. Ke1(+) Rf2 2. e2! B- 48. Ke1 B- 49. Kd1 f7! (49. ... B-?? 50. Ke1 a draw by a 3d repetition: only 12 squares are accessible for bl B. 4x12=48!) 50. Ke1 B- 98. Ke1 B- 99. Kd1 P-! (99. ... B-?? 100. Ke1 a draw by the 50 moves rule: now B can visit more than 12 squares) 100. Nd5 ... 848. Ke1 B- 849. Kd1 h6xNg5 (the only legal possibility!) 850. Ke1 & 1. Nxh3# 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. 850=1+48+16x50+1. 48=4x12. 4x13=52>50.
play all play one stop play next play all
Keywords: 50 move rule, Defensive Retractor, Type Proca
Genre: Retro
Input: Gerd Wilts, 1996-12-14
Last update: Gerd Wilts, 2004-6-6 more...
90 - P0008527
Nikita M. Plaksin
Valery Liskovets

(36) Die Schwalbe 156 1995
P0008527
(14+6)
#1 vor 101
VRZ, Typ Proca
I 1. Nf6+
II (AP-justification of Bl's turn to move) 0. ... Bxe4!? 1. b6! B- (1. ... Bd5#?? illegal: Bl's turn to move has not been justified yet!) 48. Rh6 Bxg2! (48. ... B-?? 49. Rh5 a draw by a 3d repetition: only 12 squares are accessible for bl B. 4x12=48!) 49. Rh5 B- 98. Rh6 0-0-0+! (98. ... B-??: a draw by the 50 moves rule; now B can visit more than 12 squares) 99. Kf7 Bd5/- 100. Kf6/Ke7 Rf8+/Re8+/- 101. Rxf8#/Rxe8#/a8Q# B can visit each square no more than twice on odd and twice on even moves (i. e. with different positions of wT), otherwise a draw would stop the game by the 3 times repetition rule. Here is a possible 12-squared route of bl B (a corresponding proof game): 1. e4 2. c6 3. a4 4. b5 5. a6 6. f1 7. e2 8. d1 9. c2 10. b1 11. f5 12. d3 13. e4 14. c6 15. a4 16. b5 17. a6 18. f1 19. e2 20. d1 21. c2 22. b1 23. f5 24. d3 25. b5 26. a6 27. f1 28. e2 29. d1 30. c2 31. b1 32. f5 33. d3 34. e4 35. c6 36. a4 37. b5 38. a6 39. f1 40. e2 41. d1 42. c2 43. b1 44. f5 45. d3 46. e4 47. c6 48. a4. AP after Keym.
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VL: The diagram is misattributed (cf. P0006412). Correct:
Valery Liskovets
2000 "Shakhm. Kompoz." No37 #163 Sp.Pr.
Stipulation: #101 AP (2002-4-5)
comment
Keywords: 50 move rule, Defensive Retractor, Type Proca, Castling
Genre: Retro
Input: Gerd Wilts, 1996-12-14
Last update: Gerd Wilts, 2004-6-6 more...
91 - P1004085
Nikita M. Plaksin
Gusew 50 JT 1996
Spezialpreis
P1004085
(16+13)
=
1. Sc1-d3 remis durch 50-Züge-Regel
play all play one stop play next play all
Henrik Juel: Here is a possible retroplay, v denoting a harmless waiting move: -1... Kg6 -2.Sd3 v -3.Bc1 v -4.Qb2 v -5.Bb1 v -6.Qa2 Bb2 -7.Qa8 Ba3 -8.Ba2 v -9.Bb2 v -10.Rb1 v -11.Bc1 v -12.Rb2 v -13.Bb1 v -14.Ra2 Bb2 -15.Ra7 Ba3 -16.Ba2 v -17.Bb2 v -18.Rb1 Qd1 -19.Bc1 Re1 -20.Rb2 gRg1 -21.Bb1 v -22.Ra2 Bb2 -23.2Ra5 Ba3 -24.Ba2 v -25.Bb2 Qb1 -26.Bc1 Qb2 -27.Bb1 Qa2 -28.Rb5 Bb2 -29.Rb7 Qa7 -30.Ba2 Ba3 -31.Bb2 Rb1 -32.Bc1 Rb2 -33.Bb1 Ra2 -34.v Bb2 -35.v Ra6 -36.Ba2 Ba3 -37.Bb2 Rb1 -38.Bc1 Rb2 -39.Bb1 Ra2 -40.v Bb2 -41.v Rb6! -42.v 2Ra6 -43.Ra5 v -44.Ra2 Ba3 -45.Rb2 v -46.Ba2 v -47.Rb1 v -48.Bb2 v -49.Rg1 v -50.Bc1 v -51.b2:QR etc. One move is 'wasted' because there is not enough room on the a-file. (2003-12-8)
comment
Keywords: 50 move rule
Genre: Retro
Reprints: H7 FIDE Album 1995-1997 2004
Input: Gerd Wilts, 2002-5-10
Last update: Gerd Wilts, 2004-8-6 more...
92 - P1004086
Nikita M. Plaksin
Moscow 850 1997
Shakhmatnaya Kompozitsiya 19, p. 19, 1997
Spezialpreis
P1004086
(14+15)
h#2
1. Lxc6! Tg4 2. Dd5 Txg1# (1. Tg4/Lg4,Lh5? remis durch 50-Züge-Regel)
play all play one stop play next play all
Keywords: 50 move rule, Bristol
Genre: Retro
Reprints: H8 FIDE Album 1995-1997 2004
Input: Gerd Wilts, 2002-5-10
Last update: Mario Richter, 2018-8-30 more...
93 - P1009513
Nikita M. Plaksin
H3 FIDE Album Annexe 1992-1994 2003
P1009513
(13+13)
-1w, dann h#1
R: 1. 0-0?, dann 1.Kd1 Ld3/e4/f5#
R: 1. Tf2-f1, dann 1. Kf1 Le4#
play all play one stop play next play all
Keywords: 50 move rule, Help retractor
Genre: Retro
Input: Gerd Wilts, 2003-9-7
Last update: Gerd Wilts, 2004-3-20 more...
94 - P1067415
Nikita M. Plaksin
Russian Chess Federation 2000
Spezialpreis, Kralin 50 JT
P1067415
(14+16)
Remis
Keywords: 50 move rule
Genre: Retro
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2005-1-9
Last update: Gerd Wilts, 2005-1-9 more...
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