Author: Thomas McBurney
Date: 23:32:43 06/08/03
Go up one level in this thread
On June 08, 2003 at 19:25:14, George Tsavdaris wrote: >This is from Chessmaster's classic games: > >In the following position from a game between chess engines >Belle Vs Chess -1979, and after 44.e5 the annotator for Chessmaster said: >"A fine pawn sacrifice which produces a powerful passed d-pawn." > >And indeed after 44.e5 if 44...Bxe5 then 45.Nxe5 dxe5 and white is >winning due to the passed d-pawn. >But the few engines i tried (Shredder7.04 / Fritz8.00.8 D-Junior8/ZX / >Chess Tiger 15.0ga) don't play 44.e5 because after this instead of >44...Bxe5 they play 44...Rxc4. The game after 44...Rxc4 >looks drawn to me but after long analysis seems it is a win for white >(Rook Vs Knight in the endgame). >So indeed 44.e5 maybe the best but not for the reason the annotator >said. Because after the Rxc4 there is no passed pawn. >Most programs here prefer 44.Qxb3 with a big score, that is steadily >decreasing. >So what is the best move after all? Any program finds e5? > >[D]3q2k1/2n2pb1/3p4/2pP2p1/2N1P2p/1p1Q1P2/2r2BPP/3R2K1 w - - 0 44 > I tried this position with my chess engine Kanguruh, which is not a particularly strong engine, but it was interesting to note that it found the move e5 but then later changed it's mind to Qxb3 with a large score. 1 -652 11 211 d3b3 2 -14 10 341 d3b3 c2e2 3 -10 9 673 d3b3 c2e2 b3b7 4 -11 9 6128 d3b3 c2e2 d1d2 e2d2 5 2 68 27146 d3b3 c2c3 b3a4 g8h8 g1h1 6 0 267 149151 d3b3 c2c3 b3a4 g8h8 g1h1 d8e7 7 6 1019 536827 d3b3 c2c3 b3a4 g8h8 g1h1 d8e7 f2e3 7 6 8162 4724430 e4e5 g7e5 c4e5 d6e5 d3b3 c2e2 f2c5 g8h8 8 -1 72461 28315831 e4e5 d8b8 e5d6 c7a8 d6d7 c2c3 d3e4 a8b6 8 -1 94139 36344180 d3b3 c2c3 b3a2 g7d4 f2d4 c5d4 d1d4 c3c1 g1f2 g8h 8 d4d3 9 101 177487 64377763 d3b3 c2c3 b3a2 g7d4 f2d4 c5d4 d1d4 c3c1 g1f2 c1h 1 a2a3 c7e8 h2h3 The following is what Kanguruh thinks of blacks position after e5 has been played. 1 -402 45 161 c2b2 1 -402 44 253 c2a2 1 -402 43 574 d6e5 2 80 39 1431 d6e5 d3b3 3 83 33 2658 d6e5 d3b3 c2e2 4 83 10 12462 d6e5 d3b3 c2e2 f2c5 5 83 110 39180 d6e5 d3b3 c2e2 f2c5 c7d5 6 -17 339 107672 d6e5 d3b3 6 -17 3063 1047630 g7e5 c4e5 7 -30 12031 4439023 g7e5 c4e5 d6e5 d3b3 c2e2 g1f1 c5c4 b3c4 e2b2 f1g 1 7 -30 23462 8823090 d8b8 e5d6 c7a8 d6d7 c2c3 d3e4 a8b6 8 -12 48333 17679839 d8b8 e5d6 c7a8 d6d7 a8b6 c4b6 b8b6 d1b1 c2c3
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