Author: Uri Blass
Date: 12:32:14 12/08/02
Go up one level in this thread
On December 08, 2002 at 15:09:15, Mike S. wrote: >On December 08, 2002 at 08:34:16, Bob Durrett wrote: > >>I am interested in knowing whether or not modern chess engines recognize >>advantages of these types. > >It is probably inavoidable, that the simple positions I tried to design are >mixtures of various advantages and disadvantages. Hopefully the main element is >the one in your question, each: > >>(1) If the White side has a substantial space advantage, but nothing else, will >>the chess engine evaluate the positions with that advantage and give it a high >>score? > >[D]rnbqkbnr/pppppppp/8/PPPPPPPP/8/8/8/RNBQKBNR w KQkq - 0 1 > >Analysis by Fritz 7: > >1.h6 gxh6 2.Nf3 hxg5 3.Nxg5 Nh6 4.Bd3 > +- (1.53) Depth: 5/32 00:00:00 93kN > ± (1.31) Depth: 6/25 00:00:00 124kN >(...) >1.h6 g6 2.e6 dxe6 3.Bb2 e5 4.fxg6 hxg6 5.h7 Nd7 6.c6 bxc6 7.hxg8Q > +- (1.44) Depth: 10/39 00:00:18 5080kN > +- (2.34) Depth: 11/43 00:00:48 14730kN > >Analysis by Chess Tiger 14.0: > >1.h6 gxh6 2.Qh5 e6 3.fxe6 dxe6 4.d6 hxg5 5.Bxg5 Qd7 6.c6 > +- (2.18) Depth: 8 00:00:00 55kN > +- (1.66) Depth: 9 00:00:02 308kN >(...) >1.h6 g6 2.fxg6 fxg6 3.e6 dxe6 4.Bb2 Nf6 5.d6 cxd6 6.cxd6 exd6 7.Bxf6 > +- (2.62) Depth: 11 00:00:26 3734kN > +- (3.06) Depth: 12 00:00:52 8330kN > >Interesting, that both start with 1.h6 and later come back to it, consindering >some other moves in between (I snipped them to save place). The engines >immediatly choose a move which weakens Black's king position. This is a bad example because simple square table programs can see white advantage because it is better to push pawn forward. h6 simply wins material New position rnbqkbnr/pppppppp/7P/PPPPPPP1/8/8/8/RNBQKBNR b KQkq - 0 1 Analysis by yace_mo: 1...gxh6 2.gxh6 = (0.00) Depth: 1 00:00:02 1...gxh6 2.gxh6 = (0.00) Depth: 2 00:00:02 1...gxh6 2.gxh6 e6 3.dxe6 = (0.00) Depth: 3 00:00:02 1...gxh6 2.gxh6 e6 3.dxe6 dxe6 = (0.00) Depth: 4 00:00:02 1...gxh6 2.gxh6 e6 3.dxe6 dxe6 4.fxe6 = (0.00) Depth: 5 00:00:02 5kN 1...gxh6 2.gxh6 e6 3.dxe6 dxe6 4.fxe6 fxe6 5.Qxd8+ Kxd8 = (0.00) Depth: 6 00:00:02 26kN 1...gxh6 2.gxh6 e6 3.dxe6 dxe6 4.fxe6 fxe6 5.Qxd8+ Kxd8 6.Be3 = (0.00) Depth: 7 00:00:02 55kN 1...gxh6 2.gxh6 e6 3.dxe6 dxe6 4.fxe6 fxe6 5.Qxd8+ Kxd8 6.Be3 Be7 = (0.00) Depth: 8 00:00:02 273kN 1...gxh6 2.e6 dxe6 3.Bb2 e5 4.Bxe5 hxg5 5.Bxh8 Nd7 ² (0.40) Depth: 9 00:00:04 1007kN 1...gxh6 2.e6 dxe6 3.Bb2 e5 4.Bxe5 f6 5.Qh5+ Kd7 6.c6+ bxc6 7.bxc6+ Nxc6 ± (1.00) Depth: 9 00:00:05 1007kN 1...c6 2.dxc6 ± (0.99) Depth: 9 00:00:12 3803kN 1...c6 2.dxc6 bxc6 3.bxc6 dxc6 4.Qxd8+ Kxd8 5.hxg7 Bxg7 6.f6 exf6 7.exf6 Bf8 8.Be3 = (0.00) Depth: 9 00:00:22 8503kN 1...c6 2.dxc6 bxc6 3.bxc6 dxc6 4.Qxd8+ Kxd8 5.hxg7 Bxg7 6.f6 exf6 7.exf6 Bf8 8.Be3 Nd7 = (0.00) Depth: 10 00:00:53 21877kN 1...c6 2.hxg7 Bxg7 3.f6 Bf8 4.g6 fxg6 5.Bd3 Qc7 6.d6 exf6 7.dxc7 cxb5 ² (0.40) Depth: 11 00:01:31 39504kN 1...c6 2.Bb2 e6 3.hxg7 cxd5 4.gxh8Q Qxa5+ 5.Rxa5 Nf6 ± (1.40) Depth: 11 00:02:34 67365kN 1...c6 2.Bb2 e6 3.hxg7 Bxg7 4.f6 Bf8 5.g6 fxg6 6.dxe6 Bxc5 7.f7+ Kf8 8.fxg8Q+ Rxg8 9.bxc6 +- (1.80) Depth: 11 00:02:43 70901kN (blass, tel-aviv 08.12.2002) >>(2) If the White side has a substantial time (or development) advantage, but >>nothing else, will the chess engine evaluate the positions with that advantage >>and give it a high score? > >This was the starting position in a large experiment, published in the CSS >magazine 4/2002: > >[D]rnbqkbnr/pppppppp/8/8/3PP3/2NB1N2/PPPBQPPP/R3K2R b KQkq - 0 7 > >In a tournament (double round robin) Black (!) managed to achieve a 20% score. - >So, not even such a large developement advantage is a guarantee to win in >computer chess. Again bad example because it is solved by piece square table. Uri
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