Author: John Merlino
Date: 16:02:05 07/12/03
Go up one level in this thread
On July 12, 2003 at 18:57:18, John Merlino wrote: >In a recent game that I played on ICC with CM9000 (default personality) against >Tinker (a very good amateur program that plays with a nice style), Tinker played >several moves that would lead me to believe that it is too materialistic in its >evaluation. Here are a few positions to test if your engine might have the same >problems. > >In this first position, Tinker is up two pawns and is probably winning: > >[D]r1b1k2r/p1p2ppp/2p5/4P3/2P2qn1/3B4/1B2Q1PP/R3K2R b KQkq - 0 15 > >However, it plays 15...Nxh2? Before this move, CM thought it was down about 1.0; >after it thought it was up about 0.4. > >A few moves later and now Tinker is up FOUR pawns (although the knight on h2 >will soon be lost), although CM's eval only favored Black by about 1.0. > >[D]r3k2r/p1p2ppp/2p1b3/8/2P4q/3B2P1/1B2Q2n/R2K3R b kq - 0 18 > >Tinker now plays 18...Qxg3?, and the eval jumps up to about 0.5 in White's >favor. > >Finally, this position. Material is "even", but White has a clear advantage. >CM9000 scored this position about 1.7 in White's favor. > >[D]r3k1r1/5p1p/2p1b3/8/q1P5/p1BB1Q2/8/R1K4R b q - 0 27 > >Tinker plays 27...Bxc4? which loses outright. After this move, CM gives an eval >of 6.5 for White. > >How do your engines do at avoiding these moves? > >Finally, just for fun, here's a position from a few moves later: > >[D]r1k3r1/5p1p/2p2Q2/8/2q5/p1B5/8/R1K1R3 w - - 0 31 > >In this position, on my P4-2.4, Chessmaster announces Mate in 14 in 0:15, and >upgrades it to Mate in 13 after 0:23. > >jm I guess I should have given a little more information. First of all, this was a 3/0 game. Secondly, here are the moves that CM suggests for each position after a 5-second search (reasonable regarding the time control): 1) 15...Rb8 with an eval of -1.07 for Black. 2) 18...Qg5 with an eval of 0.25 for White. 3) 27...a2 with an eval of 1.19 for White. jm
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