Ich habe im Zusammenhang mit der neuen Chess-OK App (7-piece chess endgame training für Android) die Stellung eingegeben. Da wird folgende beste Lösung ab Beginn des 7-Steiners (Zug. 87) angezeigt.
Zuvor aber noch die Lösung ab dem Diagramm:
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "1n6/1k6/3K4/BB1N4/8/5b2/8/8 b - - 0 1"]
[SetUp "1"]
{White mates in 39:} 1... Bg2 2. Nb4 {[%t Long] ''} 2... Bh1 3. Nd3 Na6 4. Nf4
Bf3 5. Ne6 Ka7 6. Nd8 Nb8 7. Bf1 Bh1 8. Be2 Bg2 9. Bb4 Kb6 10. Bc5+ Ka5 11.
Ba7 Na6 12. Nc6+ Bxc6 13. Kxc6 Nb4+ 14. Kc5 Na6+ 15. Kc4 Nc7 16. Bd4 Ne6 17.
Be3 Nc7 18. Bd3 Na6 19. Bg5 Kb6 20. Be4 Kc7 21. Kb5 Nb8 22. Bf4+ Kc8 23. Bf5+
Kb7 24. Bg4 Na6 25. Bf3+ Kc8 26. Kxa6 Kd8 27. Bg4 Ke8 28. Bg5 Kf7 29. Bf5 Kg7
30. Kb6 Kf7 31. Kc6 Kg7 32. Kd6 Kf7 33. Ke5 Kg7 34. Ke6 Kf8 35. Kf6 Ke8 36.
Kg6 Kf8 37. Bd7 Kg8 38. Bh6 Kh8 39. Bg7+ Kg8 40. Be6# {Lomonosov tables} *
[Event "Open Ch of"]
[Site "Gyor"]
[Date "1990.09.22"]
[Round "?"]
[White "Baburin, Alexander"]
[Black "Kozlov, Oleg"]
[Result "1-0"]
[BlackElo "2360"]
[ECO "D36"]
[EventCountry "HUN"]
[EventDate "2012.01.14"]
[EventType "game"]
[PlyCount "251"]
[WhiteElo "2475"]
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Nbd7 6. e3 c6 7. Bd3 Bd6 8.
Nf3 O-O 9. Qc2 h6 10. Bh4 Re8 11. O-O (11. O-O-O {!?}) 11... Nf8 12. Rae1 Bd7
13. h3 (13. e4 {!?}) 13... Rc8 14. a3 Rc7 15. b4 a6 16. e4 dxe4 17. Nxe4 Be7
18. Bg3 Rc8 19. Nc5 Bxc5 20. dxc5 Rxe1 21. Rxe1 Be6 {±} 22. Ne5 (22. Bd6 {!?})
22... Nh5 23. Bh2 a5 24. Nc4 axb4 25. axb4 Ra8 26. Nd6 Ra2 27. Qc3 Qh4 28. Re2
Rxe2 29. Bxe2 Nf6 30. Bg3 Qg5 31. Bf3 Nd5 32. Qe1 Ng6 33. Nxb7 Ngf4 34. Qe4
Qf6 35. Nd6 (35. Bxf4 Nxf4 36. Qxc6 Qg5 37. Kh2 Nxh3 38. Qd6 Nxf2 39. Qd8+
Qxd8 40. Nxd8 {+−}) 35... g5 36. Kh2 Qb2 37. Nf5 Qxb4 38. Nxh6+ Kg7 39. Nf5+
Kf6 40. Qxb4 (40. Nd4 {!} 40... Qxc5 41. h4) 40... Nxb4 41. Nd4 Nfd3 42. Bd6
Bd7 43. Kg3 Kg6 44. Be2 f5 45. f3 Kf6 46. Kh2 f4 47. g4 fxg3+ 48. Kxg3 Ne5 49.
h4 gxh4+ 50. Kxh4 Nf7 51. Bb8 Nd8 52. f4 Nb7 53. Be5+ Ke7 54. f5 Nd5 55. Kg5
Nxc5 56. f6+ Nxf6 57. Bxf6+ Kd6 58. Nf5+ Kd5 59. Bf3+ Kc4 60. Nd6+ Kd3 61. Kf4
Ne6+ 62. Ke5 Nd4 63. Be4+ Kc3 64. Kf4 c5 65. Ke3 Kb4 66. Bh4 Bc6 67. Bg6 Bd7
68. Bf6 Nb5 69. Ne4 Be6 70. Bg7 Nd4 71. Bf8 Nb3 72. Nf2 Kb5 73. Nd3 c4 74.
Be8+ Ka5 75. Bb4+ Kb6 76. Nb2 Bg8 77. Na4+ Ka6 78. Ke4 Nc1 79. Nc3 Kb6 80.
Nd5+ Ka6 81. Nc3 Kb6 82. Kd4 Nb3+ 83. Ke5 Nc5 84. Kf6 Na6 85. Na4+ Kb7 86. Ba5
c3 87. Nxc3 {
White mates in 69:} 87... Nc7 (87... Nb8 88. Bg6 Nc6 89. Be4 Bh7
90. Bf3 Bg8 91. Bd8 Bc4 92. Na4 Bb5 93. Nc5+ Ka7 94. Bc7 Nb4 95. Bg3 Bc6 96.
Be2 Bb5 97. Bxb5 Kb6 98. Bf1 {[%t Long] ''} 98... Kxc5 99. Ke6 Kd4 100. Bf2+
Ke4 101. Bg2+ Kf4 102. Bb7 Nd3 103. Bb6 Ne1 104. Bc7+ Ke3 105. Kf5 Kf2 106.
Kg4 Ke2 107. Bb6 Kd2 108. Ba5+ Ke2 109. Be4 Nd3 110. Bf5 Ke3 111. Bb6+ Ke2
112. Kg3 Nb4 113. Be6 Nd3 114. Bd4 Ne1 115. Bc4+ Nd3 116. Bb5 Kd2 117. Kf3 Nb4
118. Ke4 Na2 119. Be3+ Kc3 120. Bg5 Nb4 121. Bf1 Nc2 122. Bh4 Kb3 123. Bf6 Na3
124. Bh3 Kc2 125. Kd4 Nb5+ 126. Kc5 Nc3 127. Kc4 Nd1 128. Bf5+ Kd2 129. Bg5+
Ke1 130. Bg4 Nf2 131. Bh4 Kf1 132. Bf3 Nh3 133. Kd3 Ng1 134. Bh1 Nh3 135. Bb7
Ng1 136. Ke3 Nh3 137. Kf3 Ng1+ 138. Kg3 Ke1 139. Kg2+ Ke2 140. Bf2 Nh3 141.
Ba6+ Kd2 142. Kxh3 Kc2 143. Be3 Kb2 144. Kg3 Kc2 145. Kf3 Kc3 146. Ke4 Kc2
147. Kd4 Kb2 148. Bd3 Kb3 149. Bd2 Kb2 150. Kc4 Ka3 151. Kc3 Ka4 152. Kc2 Ka3
153. Bb5 Ka2 154. Bc1 Ka1 155. Bb2+ Ka2 156. Bc4# {Lomonosov tables}) 88. Bd7
{[%t Long] ''} 88... Bc4 89. Ke5 {[%t Long] '} 89... Bf1 {[%t Long] ''} 90.
Bb4 Na6 {[%t Long] '} 91. Bd6 Nb8 {[%t Long] ''} 92. Bg4 Nc6+ 93. Kd5 {[%t
Long] ''} 93... Bg2+ 94. Kc5 {[%t Long] ''} 94... Nb8 {[%t Long] ''} 95. Bg3
{[%t Long] '} 95... Na6+ {[%t Long] ''} 96. Kd6 {[%t Long] ''} 96... Nc7 {[%t
Long] '} 97. Bd7 {[%t Long] ''} 97... Bf3 98. Na4 Na6 {[%t Long] ''} 99. Bh4
Be4 {[%t Long] '} 100. Bd8 {[%t Long] '} 100... Bf3 {[%t Long] '} 101. Bb5
{[%t Long] '} 101... Bg2 102. Ba5 Bf3 {[%t Long] '} 103. Nc3 {[%t Long] '}
103... Nb8 {[%t Long] ''} 104. Nd5 {Diagram [#] We reached this position after
about 10 hours of play. That was the time when chess players knew the word
"adjournment". But this game was played in the last round and the organisers
did not anticipate that any game would go on for that long. Of course, one
did!
Many fellow players were not happy that I was playing on here - they
wanted to get their prizes and go home. But I wanted to win a prize too - and
I believed that White should be winning in this endgame. Why so? White has
several factors and ideas which are beneficial to him: 1) attack upon the
enemy king 2) attack upon the enemy knight 3) transposition to the endgame
2Bs vs. N, which is theoretically winning for the stronger side. 4) some
positions with B+N vs N or even with 2Bs vs. B can be winning too.}{[%t Long]
''} 104... Be4 ({Black avoided the line} 104... Bxd5 105. Kxd5 {but maybe
transposing into this endgame was his best practical chance. In this endgame
the best defensive position is with the knight on b7 (b2/g2/g7) and the
defender's king close to the knight. Here according to shredder tablebases
Black loses rather quickly:} 105... Ka7 106. Bd3 Kb7 107. Kd6 Nc6 108. Be4 Ka6
109. Bc3 Na5 110. Bd3+ Kb6 111. Bd4+ Kb7 {Diagram [#]} 112. Be2 Nb3 113. Bc3
Kb6 114. Bc4 Na5 115. Bd4+ Kb7 116. Be6 Ka6 117. Kc5 Nb7+ 118. Kb4 Nd6 119.
Bc5) 105. Be1 Bf3 106. Bf2 Be4 107. Ne3 Bc6 108. Be2 Bh1 109. Nc4 Nc6 110. Bf1
{ Diagram [#] That last capture was on move 87, so I had used 23 of the 50
moves which I had. Luckily, I was able to focus (not easy after more than 10
hours of continuous play!) and came up with a nice plan.} 110... Bf3 (110...
Ka6 111. Kc7 {!} 111... Nb4 112. Nb2+) 111. Nd2 Bh1 112. Nb3 Bf3 113. Bb5
{White's plan has become clear - Black can't keep his knight on c6.}{!} 113...
Na7 (113... Nb4 114. Na5+ Kb8 115. Kc5 Nd5 116. Bc6 Nf4 117. Bxf3 (117.
Bg3)117... Nd3+ 118. Kb6 Nxf2 119. Bb7) (113... Nb8 114. Na5+ Kc8 115. Bf1 Bg4
116. Bb6 Nd7 117. Ba6+ Kb8 118. Nc6+ Ka8 119. Kc7 Nxb6 120. Bb7#)(113... Nd8
114. Na5+ Ka8 (114... Kb8 115. Kd7 Nb7 116. Nc6+ Bxc6+ 117. Kxc6 Nd8+ 118. Kd7
Nf7 119. Bg3+ {+−})(114... Kc8 115. Nc4 Nb7+ 116. Ke7 Kb8 117. Ne5 Be4 118.
Bb6 Bd5 119. Bc6 Bb3 120. Be4 {+−})115. Kd7 Nb7 116. Bc6 Bxc6+ 117. Nxc6 {+−}
) 114. Na5+ Kb8 {Diagram [#]} 115. Ba6 (115. Bf1 {!?} 115... Nc8+ 116. Kd7
Bg4+ 117. Kd8 {and Black can't play 117...Nd6.}) 115... Nc8+ 116. Kd7 Bg4+
117. Kd8 Nd6 118. Nc6+ Ka8 119. Kc7 Ne8+ (119... Bc8 120. Bf1 Ne4 121. Kxc8
Nxf2 122. Ba6) 120. Kb6 Nd6 121. Bg3 Bc8 {Diagram [#]} 122. Bd3 Nf5 (122...
Bf5 123. Bf1 Nc8+ 124. Kc7 Na7 125. Nxa7 Kxa7 126. Bf2+ Ka8 127. Bg2+ Be4 128.
Bxe4#) 123. Bf4 Ng7 124. Nd4 Bb7 125. Be5 Ne8 126. Bb5 1-0