Author: Kurt Utzinger
Date: 01:11:34 05/11/03
Go up one level in this thread
On May 11, 2003 at 02:52:40, Peter Stayne wrote: >The author should check out Game 4, 24. ... Rxa2?? > [D]2qr2k1/p4ppp/1Pn3b1/1Q6/P3p1P1/B1P1P3/B2r1PP1/1R2R1K1 b - - 0 24 A very interesting position to look at by Stefan Zapproth (test on P4 1.8/32 MB hash) 1) The program needs some time to find out that 24...Rxa2 is a losing move 2) As soon as Aristarch 4.21 has noticed that 24...Rxa2 would lead to a loss, the program switches for a long time over to another variation showing a plus of +-4.63/3.04 in favour of White although White is mated in the predicted line 3) Only after reaching search depth 14/34 the program shows a stable eavluation 4) At depth search 15/38 the program again thinks that 24...Rxa2 would be the best move New game 2qr2k1/p4ppp/1Pn3b1/1Q6/P3p1P1/B1P1P3/B2r1PP1/1R2R1K1 b - - 0 1 Analysis by Aristarch 4.21: 24...Rxa2 25.b7 Qe6 26.Rbd1 Rb8 27.Bd6 Rxb7 28.Qxb7 Qe8 29.Qb3 Qe6 30.c4 Ra1 31.Rxa1 Qxd6 ³ (-0.42) Depth: 2/9 00:00:00 +- (4.64) Depth: 14/34 00:02:07 54173kN 24...Qxg4 25.Qxc6 Rxa2 26.bxa7 Rxf2 27.Kxf2 Rd2+ 28.Kg1 Qxg2# +- (4.63) Depth: 14/34 00:02:32 64784kN +- (3.04) Depth: 14/34 00:08:12 210053kN 24...axb6 25.Qxb6 Rxa2 26.g5 +- (3.03) Depth: 14/34 00:08:13 210407kN ± (1.03) Depth: 14/34 00:10:29 264575kN 24...a6 25.Qc5 Rxa2 ± (1.02) Depth: 14/34 00:11:11 282002kN +- (2.78) Depth: 15/38 00:16:01 401900kN 24...Rxa2 25.bxa7 +- (2.77) Depth: 15/38 00:16:18 410262kN +- (2.57) Depth: 15/38 00:16:26 414345kN (Utzinger, MyTown 11.05.2003) ******************************************************************************************* New game 2qr2k1/p4ppp/1Pn3b1/1Q6/P3p1P1/B1P1P3/B2r1PP1/1R2R1K1 b - - 0 1 Analysis by Chess Tiger 15.0: 24...Rxa2 25.b7 Qe6 26.Red1 Rb8 27.Rd6 Nd4 28.cxd4 Qxg4 ² (0.60) Depth: 1 00:00:00 ² (0.38) Depth: 13 00:00:29 10349kN 24...axb6 25.Bc4 Ne5 26.Qxe5 Qxc4 27.Rxb6 Qxa4 28.Be7 Qe8 29.Rb7 R2d5 ² (0.46) Depth: 14 00:02:01 40787kN ² (0.48) Depth: 16 00:09:47 206907kN (Utzinger, MyTown 11.05.2003) ******************************************************************************************** New game 2qr2k1/p4ppp/1Pn3b1/1Q6/P3p1P1/B1P1P3/B2r1PP1/1R2R1K1 b - - 0 1 Analysis by Fritz 8: 24...Rxa2 25.b7 Qc7 26.Red1 Re8 27.b8Q Qxb8 28.Qxc6 Qe5 -+ (-1.91) Depth: 6/24 00:00:00 166kN = (0.22) Depth: 9/25 00:00:01 887kN 24...axb6 25.Bc4 Ne5 26.Qxe5 Qxc4 27.Rxb6 Qxa4 28.Be7 f6 29.Qc7 Re8 30.Rd6 = (0.19) Depth: 9/25 00:00:01 1228kN ² (0.50) Depth: 15/37 00:05:46 245887kN (Utzinger, MyTown 11.05.2003) ********************************************************************************************
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