Author: Uri Blass
Date: 11:35:35 08/27/01
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On August 27, 2001 at 13:54:23, robert flesher wrote: >I find this VERY VERY hard to believe! Chess tiger 12.0 solves this very easy >and never reproduces these bad moves. Try turning off use of table bases. Tiger >12.0 knows that white is winning almost instantly after the rooks come off the >board. Gambittiger also does not reproduce the bad moves and the poster only complained about the evaluation. Here is gambit2's analysis and you can see that it does not reproduce the bad move Rcd7 New position [D]8/2r1k2p/p3p1p1/3r1p2/8/1P3PP1/P2RK2P/3R4 b - - 0 1 Analysis by Gambit Tiger 2.0: 1...Rxd2+ 2.Kxd2 Rd7+ 3.Kc2 Rxd1 4.Kxd1 e5 = (0.04) Depth: 9 00:00:00 112kN 1...Rxd2+ 2.Kxd2 e5 3.Re1 Ke6 4.Re2 Rd7+ 5.Ke3 Rc7 6.Kd3 Rd7+ 7.Ke3 = (0.00) Depth: 9 00:00:00 171kN 1...Rxd2+ 2.Kxd2 e5 3.Re1 Ke6 4.Re2 Rd7+ 5.Ke3 Rc7 6.Kd3 Rd7+ 7.Ke3 = (0.00) Depth: 10 00:00:00 263kN 1...Rxd2+ 2.Kxd2 e5 3.Re1 Ke6 4.Re2 Rd7+ 5.Ke3 Rc7 6.Kd3 Rd7+ 7.Ke3 = (0.00) Depth: 11 00:00:01 523kN 1...Rxd2+ 2.Rxd2 e5 3.Rd5 Rc2+ 4.Rd2 Rc1 5.Rd5 Rc2+ = (0.00) Depth: 12 00:00:13 3418kN 1...Rxd2+ 2.Rxd2 e5 3.Rd5 Rc2+ 4.Rd2 Rxd2+ 5.Kxd2 Ke6 6.Ke3 h5 7.h4 a5 8.Kd3 Kd5 9.Ke3 e4 10.fxe4+ fxe4 = (-0.02) Depth: 13 00:00:20 5218kN (Blass, Tel-aviv 27.08.2001) The poster complained about the fact that gambittiger does not show Rxd5 exd5 in the pv and only shows Rxd5 Rxd5 but tiger can find also 2...exd5 with black with no problems. It is possible that tiger knows that it does not understand this kind of pawn ending and prefers to give evaluation that is not symmetric. another possibility is that tiger feels uncomfortable with the fact that the opponent can force the pawn endgame and prefers not to let the opponent to do it. It is possible that tiger gives a small bonus for white when it considers Rxd5 because white can force a pawn endgame. It is logical to be afraid from it. If I see that after my move my opponent has a choice between equal position and a position that I do not understand then I am going to evaluate the move as less than a draw. Uri
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