Author: Uri Blass
Date: 00:11:14 01/05/06
Go up one level in this thread
On January 05, 2006 at 00:39:01, Joseph Ciarrochi wrote: >Rybka may have the greatest disdain for pawns of any other program. > >try this experiment out. Go to the start position of the chess board and remove >the f2 pawn (as is typically done when a gm gives pawn odds). > >Here are the evaluations of different engines at depth of 15. Can you figure out >which engine is not like the others? > >Rybka = -.26 >fritz9 = -.78 >fruit 2.2.1 = -.70 >Aristarch = - .96 > >Rybka seems to treat pawns with utter disdain. I wonder what would happen if you >lowered the pawn value of the other engines to , say .50 or .75? > >(I know it is not this simple and all the engines will consider the pawns in the >context of the position, but still, i find this amazing). > >Maybe pawns really are only with .75 in many positions > >best >Joseph No Rybka simply understand that with more material on the board a pawn is less important. I suggest that you try the following position New game - Fruit 2.2 [D]3qk3/pppppppp/8/8/8/8/PPPPP1PP/3QK3 w - - 0 1 Analysis by Rybka 1.0 Beta 32-bit: 1.e3 µ (-1.07) Depth: 3 00:00:00 1.e3 µ (-1.03) Depth: 4 00:00:00 1.e3 e6 µ (-0.91) Depth: 5 00:00:00 1.e3 e6 2.Qg4 µ (-0.95) Depth: 6 00:00:00 4kN 1.e3 e6 2.Qh5 Qf6 µ (-0.89) Depth: 7 00:00:00 9kN 1.e3 e6 2.Qh5 Qf6 3.c3 µ (-0.97) Depth: 8 00:00:00 18kN 1.e3 e6 2.Qh5 Qf6 3.c3 h6 µ (-0.94) Depth: 9 00:00:00 37kN 1.e3 e6 2.Qh5 Qf6 3.c3 h6 4.Ke2 µ (-0.90) Depth: 10 00:00:00 80kN 1.e3 e6 2.Qh5 Qf6 3.c3 h6 4.Ke2 b6 µ (-0.97) Depth: 11 00:00:01 157kN 1.e3 e6 2.Qh5 h6 3.Ke2 Qf6 4.c3 b6 5.Qg4 µ (-0.98) Depth: 12 00:00:02 383kN 1.e3 e6 2.Qh5 h6 3.c3 Qf6 4.Qc5 Qh4+ 5.g3 Qxh2 µ (-0.97) Depth: 13 00:00:04 760kN 1.e3 e6 2.Qh5 h6 3.c3 Qf6 4.Qc5 Qh4+ 5.g3 Qxh2 µ (-0.99) Depth: 14 00:00:08 1489kN 1.e3 e6 2.Qh5 h6 3.c3 Qf6 4.Qg4 Qe5 5.Qf4 Qa5 µ (-1.00) Depth: 15 00:00:18 3277kN (, 05.01.2006)
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