Author: martin fierz
Date: 01:04:27 12/15/03
Go up one level in this thread
On December 15, 2003 at 02:11:54, Richard Pijl wrote:
>On December 15, 2003 at 01:12:03, martin fierz wrote:
>
>>On December 14, 2003 at 17:30:49, Richard Pijl wrote:
>>
>>>On December 14, 2003 at 15:18:46, Richard Pijl wrote:
>>>
>>>>In a very recent game between Baron and Amateur (time control 45 10) on ICC, the
>>>>following position occurred:
>>>>
>>>>[D]7k/2B2pp1/2n1b3/P2p2Pp/2p4n/4NP2/5K2/5B2 w - - 0 55
>>>>
>>>>White is two pawns down, both passers. As compensation, White has a pair of
>>>>bishops. Understandably, Amateur showed a big plus score (+3.4), however The
>>>>Baron thought is was almost drawn (-0.34). What do your engines think about
>>>>this?
>>>
>>>Together with Dieter Bürßner we've tried to find a win for Black. We did not
>>>succeed, but ofcourse we could not examine all lines. Can someone else find a
>>>winning line?
>>
>>it would help if you posted your analysis :-)
>>i don't see how white holds on after 1.a6 Nf5, eg. 2.Bb8 Nxe3 3.Kxe3 Bc8 4.a7
>>Bb7. what did you find there?
>
>The reason that we've been looking at this position is that I/we could not
>believe that either.
>
>If you replace 2Bb8 in your line by 2.Bb6, you end up with a game position.
i see...
>We've played it out and tried some alternatives.
>The problem was we didn't find something for black to break through. At least
>none that could not be avoided by white in an earlier stage. We even ended up
>with a winning line for white once!
>
>I'll post some positions we've reached (semi-fortresses) later today. I have to
>go to work now.
...i'm looking forward to it - it's an interesting position for sure. however,
i'm pretty sure that your evaluation function is rather lucky if it turns out
that it's nearly-draw-score is in fact correct. this is not the kind of position
that looks drawish to me at all; under normal circumstances the 2 bishops won't
compensate for 2 pawns, even with a pawn on a7.
cheers
martin
>
>bye,
>Richard.
>
>>
>>cheers
>> martin
>>
>>>
>>>>
>>>>The game ended in a draw after many more moves.
>>>
>>>Full game score:
>>>
>>>[Event "ICS rated standard match"]
>>>[Site "chessclub.com"]
>>>[Date "2002.12.14"]
>>>[Round "-"]
>>>[White "thebaron"]
>>>[Black "Amateur"]
>>>[Result "1/2-1/2"]
>>>[WhiteElo "2429"]
>>>[BlackElo "2520"]
>>>[TimeControl "2700+10"]
>>>
>>>1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bb7 7. Re1 Bc5 8.
>>>c3 d6 9. a4 h6 10. d4 Bb6 11. axb5 axb5 12. Rxa8 Qxa8 13. dxe5 Nxe5 14. Bc2
>>>Qa7 15. Nd4 O-O 16. Na3 b4 17. Nab5 Qa8 18. cxb4 Nxe4 19. Re3 Re8 20. Bb1
>>>Bd5 21. b3 Qb7 22. f3 Nf6 23. Kh1 Bxd4 24. Nxd4 Qxb4 25. Bc2 Bb7 26. Re1
>>>Ra8 27. Be3 Ra2 28. Bb1 Rb2 29. Re2 Rxe2 30. Qxe2 Nd5 31. Qd2 Qb6 32. Bg1
>>>Nf6 33. Bc2 Qa6 34. Qe1 Qa8 35. h3 Qa3 36. Nf5 Qb2 37. Ne3 Nc6 38. Qe2 Qe5
>>>39. Qc4 Qa5 40. Bf5 d5 41. Qa4 Qxa4 42. bxa4 Ne7 43. Bd3 c5 44. Bh2 c4 45.
>>>Bf1 Nc6 46. Kg1 Bc8 47. g4 Kh8 48. Kf2 Bd7 49. h4 Be6 50. Bc7 h5 51. g5 Ne8
>>>52. Bb6 Nd6 53. Bc7 Nf5 54. a5 Nxh4 { diagram position } 55. a6 Nf5 56. Bb6 Nxe3
>>>57. Kxe3 Bc8
>>>58. a7 Bb7 59. Kd2 Kh7 60. Bh3 Kg6 61. f4 Ne7 62. Bd7 Nf5 63. Kc3 h4 64.
>>>Bf2 Ba8 65. Kb4 Ng3 66. Be3 Nf5 67. Bg1 Ng3 68. Bg4 f5 69. gxf6 Kxf6 70.
>>>Bd4+ Kg6 71. Be5 Ne4 72. Bd7 Nf6 73. Bh3 Kf7 74. Kb5 Ke7 75. Bd4 Nh5 76.
>>>Bc5+ Ke8 77. Kb6 Kd8 78. Bf2 Ng3 79. Bd4 Ne4 80. Bxg7 c3 81. f5 c2 82. Bh6
>>>d4 83. f6 Nxf6 84. Bc1 Ne4 85. Bf1 Nc3 86. Kc5 Na2 87. Bg5+ Kc7 88. Kxd4
>>>Bc6 89. Ke5 Kb7 90. Bh3 Kxa7 91. Be3+ Kb7 92. Kf4 Nc3 93. Kg5 Nd1 94. Bd2
>>>Nf2 95. Kxh4 Nxh3 96. Kxh3 Kb6 97. Be3+ Kb5 98. Bd2 Kc4 99. Be3 Kd3 100.
>>>Bf4 Ke2 101. Kg4 Bg2 102. Kf5 Kd3 103. Ke6 Kc3 104. Be5+ Kb3 105. Bf4 Ka2
>>>106. Be3 Kb3 107. Ke5 Kb2 108. Bd4+ Kb1 109. Be3 Bf1 110. Kd5 Kb2 111. Bd4+
>>>Kb1 112. Be3 Be2 113. Ke5 Kb2 114. Bd4+ Kb1 115. Be3 Kb2 116. Bd4+ Ka2 117.
>>>Be3 Kb1 118. Kd6 Kb2 119. Ke6 Bc4+ 120. Ke5 Bd3 121. Bd4+ Kb1 122. Be3 Be2
>>>123. Kd6 Kb2 124. Ke6 Bc4+ 125. Ke5 Ba6 126. Bd4+ Ka2 127. Be3 Kb1 128. Kd5
>>>Bf1 129. Kd6 Kb2 130. Kc6 Be2 131. Kc7 Bf3 132. Bd4+ Kb1 133. Be3 Kb2 134.
>>>Kb8 Kb1 135. Kc7 Bg4 136. Kd6 Kb2 137. Bd4+ Kb3 138. Be3 Kc4 139. Ke5 Kd3
>>>140. Kf4 Bh5 141. Bc1 Ke2 142. Ke5 Kd1 143. Be3 Bf3 144. Ke6 Ke2 145. Bf4
>>>Kd3 146. Kf5
>>>{Game drawn by the 50 move rule} 1/2-1/2
>>>
>>>>Richard
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.