Author: Uri Blass
Date: 15:40:44 11/09/02
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On November 09, 2002 at 18:13:35, Ricardo Gibert wrote: >Are there any chess engines that understand anything about strategic exchange >sacs? > > >The following is an instructive example of an exchange sac that yields a >strategicly won position: > >[D]r3r1k1/1pqn1pbp/p2p2p1/3P4/1RP5/4B3/P3BPPP/3Q1RK1 b - - > >From Polugaevsky-Petrosian 50th USSR Ch Final 1958 > >19...Rxe3!! 20.fxe3 Nc5-+ 21.Qc2 Re8 22.Rf3 Bh6 23.Qc3 Qe7 24.Rb6? Na4 0-1 > >Neither Nimzo8 nor Ruffian 1.0.1 have a clue in the above position. Movei can see only a small positional compensation for white(score 1.30 at depth 11 and 1.20 at depth 12 after 19...Rxe3 20.fxe3 Nc5 when the material advantage is considered as slightly more than 1.30) Maybe with bigger positional scores it can find it. depth=11 +1.30 f1f3 c7a5 d1b1 a8e8 b4b6 a5d2 g1f2 f7f5 f2f1 g7e5 g2g3 Nodes: 24362368 NPS: 116907 Time: 00:03:28.39 depth=11 +1.30 f1f3 c7a5 d1b1 a8e8 b4b6 a5d2 g1f2 f7f5 f2f1 g7e5 g2g3 Nodes: 39418809 NPS: 118563 Time: 00:05:32.47 depth=12 +1.20 f1f3 c7a5 d1b1 a8e8 g1h1 g7h6 b4b6 h6e3 b6d6 a5d2 b1f1 f7f5 Nodes: 41103072 NPS: 118613 Time: 00:05:46.53 Can you win Ruffian or Nimzo with black from the above position? Uri
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