Author: Dieter Buerssner
Date: 14:47:39 06/12/05
Go up one level in this thread
No idea, what you want to say. But the position is interesting, anyway. How
should a chess engine evaluate b1B without TBs. It will probably not be able to
win against best defense, so it can evaluate b1B just as b1Q. Nalimov TBs say:
63...b1=B {EGTB} 64.Kb4! Bh7! 65.Nc3+ Kb2!
66.Nd5! Bg7 67.Kc5! Kc2! 68.Nf4 Be5! 69.Ne6!
Bg8! 70.Nd4+! Kd3! 71.Nf5! Ba2 72.Ne7! Bb2
73.Nc6 Ba3+ 74.Kb5 Bb1 75.Na5 Kd4! 76.Nb7 Be4
77.Nd8 Bb2 78.Kb6! Kd5! 79.Nb7 Bd4+! 80.Kc7!
Bf2! 81.Nd8! Bg3+ 82.Kb6! Kc4! 83.Nb7! Kb4!
84.Nd8! Bf2+! 85.Kc7! Kb5! 86.Kd6! Bc2 87.Nf7!
Bg3+! 88.Ke6! Bb3+! 89.Kf6! Bh4+! 90.Kg6! Kc5!
91.Ng5! Bc2+! 92.Kh5! Bg3! 93.Kg4! Bd6! 94.Kf3!
Kd4! 95.Ne6+ Ke5! 96.Nf4! Be4+! 97.Kg4! Bc7!
98.Kg5! Bc2! 99.Ng6+! Kd5! 100.Nf4+! Ke4!
101.Nh5! Ke5! 102.Nf4! Bd8+! 103.Kg4! Ke4!
104.Ng6! Bd1+! 105.Kg3! Ke3! 106.Kh3! Bb3
107.Kg4! Ba4 108.Ne5 Ke4! 109.Ng6! Bd7+!
110.Kh5! Be8! 111.Kh6! Bf6 112.Nf8 Kf5! 113.Nh7
Bb2! 114.Nf8! Kf6! 115.Nh7+! Kf7! 116.Kh5 Kg7+
117.Kg5 Bg6 118.Nf8! Bc1+! 119.Kg4 Kxf8!
120.Kg3 Bh5 121.Kh4! Be2 122.Kh3 Be3 123.Kh4
Kf7 124.Kh3 Kf6 125.Kh4 Kf5 126.Kh3 Kf4!
127.Kh4! Bf2+ 128.Kh3 Bf1+ 129.Kh2 Be3 130.Kh1
Kf3! 131.Kh2 Kf2! 132.Kh1 Bg2+! 133.Kh2 Bf4#!
It is not even clear, that b1B wins (if I have not overlooked anything). Above
"shortest mate PV" needs more than 50 moves without capture. Even, when it was
shorter than 50 moves - I guess no engine will be able to really force a win in
complicated KBBKN positions. Engine might for good reasons decide, to call it
draw.
Regards,
Dieter
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