Author: Robert Hyatt
Date: 10:23:00 08/27/01
Go up one level in this thread
On August 26, 2001 at 14:40:33, Roy Eassa wrote: >[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.) I get Re5+ here. Score is +.22 (somewhat better for white). If I try the Rcd7 move, I get a score of +.5 for white. Crafty understands that the white queenside (distant) majority becomes stronger as the rooks come off. At depth=13, 30 seconds, score=+.70 and is climbing...
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