Author: Roy Eassa
Date: 11:40:33 08/26/01
[D] 8/2r1k2p/p3p1p1/3r1p2/8/1P3PP1/P2RK2P/3R4 b - - I reached this position as white recently, and after the game I used Gambit Tiger 2.0 to help analyze. What occurred in the game was: 1... Rcd7(?) 2. Rxd5 Rxd5?? 3. Rxd5 exd5 after which I believe white should win (which I did). I believe it's very bad for black to trade off both pairs of rooks, and best to avoid allowing white to exchange even one pair of rooks here because of isolating black's pawn. It appears that Gambit Tiger 2 on my Athlon 1.2 GHz does not really understand that after move white's move 3 above, white should win. And it believes the position is essentially equal after white's move 2. Here is its analysis after black's move 1: 00:00:00.9 0.22 9 168541 h3 Kf6 Rxd5 exd5 Rc1 Ke6 Kd3 f4 Rc6+ Rd6 Rxd6+ Kxd6 00:00:00.3 0.16 9 184134 h3 Rxd2+ Rxd2 Rxd2+ Kxd2 e5 Ke3 Ke6 g4 fxg4 fxg4 h5 a3 hxg4 hxg4 00:00:01.9 0.12 10 445643 h3 Rxd2+ Rxd2 Rc7 Kd1 e5 Rc2 Rxc2 Kxc2 e4 fxe4 fxe4 Kc3 00:00:01.4 0.16 10 710893 Rxd5 Rxd5 Rc1 Kd6 Rc8 Rc5 Rxc5 Kxc5 Kd3 Kb4 h4 Ka3 00:00:02.8 0.16 11 905910 Rxd5 Rxd5 Rc1 Kd6 Rc8 Rc5 Rxc5 Kxc5 Kd3 Kd5 g4 e5 gxf5 gxf5 00:00:03.0 0.16 12 1519152 Rxd5 Rxd5 Rxd5 exd5 b4 Ke6 Ke3 Ke5 f4+ 00:00:05.5 0.16 13 2286175 Rxd5 Rxd5 Rxd5 exd5 b4 Ke6 Ke3 Ke5 f4+ Kd6 a4 Ke6 Kd4 h6 b5 axb5 axb5 00:00:09.6 0.18 14 3833264 Rxd5 Rxd5 Rxd5 exd5 b4 Ke6 Ke3 h6 f4 g5 a3 gxf4+ Kxf4 d4 Kf3 d3 Ke3 00:00:18.1 0.20 15 7566502 Rxd5 Rxd5 Rxd5 exd5 b4 Kd6 Ke3 g5 f4 gxf4+ Kxf4 d4 a3 h5 Kf3 d3 Ke3 but after 2. Rxd5, suddenly Tiger prefers black to recapture with the pawn rather than the rook, and its evaluation becomes worse for black. Non-Gambit Tiger behaves very similarly. Is the lack of endgame knowledge in me or the program, or is it something else? (Using 96MB hash; Not using table bases.)
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