Author: Uri Blass
Date: 16:26:43 11/09/02
Go up one level in this thread
On November 09, 2002 at 18:40:44, Uri Blass wrote: >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 Update. I looked at the analysis of movei and it seems that Rf3 failed low for some reason(or maybe movei changed it's mind to Rb1 and Rb1 failed low. Here are the last lines: depth=13 +0.60 b4b1 c7a5 d1c2 a8e8 g1h1 e8e3 e2d1 g7d4 d1g4 f7f5 b1d1 e3e4 g4e2 Nodes: 341408921 NPS: 120078 Time: 00:47:23.22 depth=13 +0.61 d1e1 Nodes: 370167686 NPS: 120674 Time: 00:51:07.48 Qe1 failed high Uri
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