Author: Mark Young
Date: 08:04:59 11/08/01
Go up one level in this thread
On November 08, 2001 at 10:20:37, Uri Blass wrote: >I define a real sacrifice of chess program as a move that is losing material >based on only material evaluation but is played by the program because the >positional score is bigger than a pawn. Most of the Real sacs I have seen are based on mating attacks. Do you define this as a real sacrifice? > >How many real sacrifice are played by programs? > >It may be interesting to get information about the average number of real >sacrifice per game by different programs. > >I define a sacrifice as something that is seen by only material evaluation as a >mistake and the program need to choose it not because of the fact that the loss >was too deep or because a bug in the search but because of the evaluation >function. > >Here is an example of a real sacrifice that part of the programs play(after h4 >Nxh4 black is a pawn down) and example of a move that I believe that is simply a >tactical blunder that is too deep for programs to see > >Abir Har aven - Uri Blass >[D]rnbqkbnr/ppp1ppp1/8/3p3p/5P2/5NP1/PPPPP2P/RNBQKB1R b KQkq - 0 1 > >Analysis by Junior 7: > >3...h4 4.Nxh4 > ² (0.32) Depth: 3 00:00:00 >3...g6 4.Nc3 > = (0.06) Depth: 3 00:00:00 >3...d4 4.Bg2 > = (-0.01) Depth: 3 00:00:00 >3...c5 4.Nc3 > = (-0.06) Depth: 3 00:00:00 >3...Nh6 4.Nc3 > = (-0.09) Depth: 3 00:00:00 >3...Nf6 4.Nc3 > = (-0.20) Depth: 3 00:00:00 >3...Bf5 4.Nc3 > ³ (-0.34) Depth: 3 00:00:00 >3...Bf5 4.Nh4 Be4 5.Bg2 Bxg2 6.Nxg2 > ³ (-0.26) Depth: 6 00:00:00 >3...Nf6 4.Nc3 Bf5 > ³ (-0.30) Depth: 6 00:00:00 >3...c5 4.Nc3 d4 5.Na4 Qd5 > ³ (-0.39) Depth: 6 00:00:00 1kN >3...c6 4.c3 Qb6 5.Qa4 > ³ (-0.46) Depth: 6 00:00:00 2kN >3...Qd6 4.Nc3 Qc5 > ³ (-0.48) Depth: 6 00:00:00 2kN >3...Qd6 4.d4 Bf5 5.Nh4 Be4 6.Bg2 Bxg2 > ³ (-0.41) Depth: 9 00:00:00 14kN >3...Qd6 4.c4 dxc4 5.Na3 c3 6.Bg2 Qb6 7.bxc3 > ³ (-0.42) Depth: 12 00:00:00 170kN >3...h4 4.Bg2 h3 5.Bf1 c6 6.c3 Qb6 7.Qa4 > ³ (-0.58) Depth: 12 00:00:00 317kN >3...h4 4.Rg1 hxg3 5.Rxg3 Qd6 6.d3 Bf5 7.Bd2 > ³ (-0.54) Depth: 15 00:00:04 2153kN > >(Blass, Tel-aviv 08.11.2001) > >Dov Rozenberg - Uri Blass >[D]2r2rk1/p3q1pp/bp6/2bp1p2/4n3/1P2P1P1/PB1N1PBP/1QRR2K1 w - - 0 1 > >I believe that 23.Nf1 is losing a pawn or a rook for a bishop and a pawn but >programs positional scores are high here and simply hide the picture and I have >not program with only material evaluation to check it. > >the analysis is 23.Nf1 Be2 24.Rxd5 Qf7 25.Re5 Rcd8 26.g4 fxg4 27.Rxe4 Qxf2+ >28.Kh1 Bf3 29.Bxf3 Qxf3+ 30.Kg1 g3 31.Qc2 gxh2+ > >In the game my opponent chose 26.Rcxc5 > >Is there a program with only material evaluation or at least mainly material >evaluation in order to find tactical mistakes or sacrifices in a game and if >there is more than one what is the best program to find material mistakes or >sacrifices? > >Uri
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