Author: Robert Hyatt
Date: 12:51:17 10/01/01
Go up one level in this thread
On October 01, 2001 at 14:52:03, Miguel A. Ballicora wrote: >On October 01, 2001 at 12:09:27, Robert Hyatt wrote: > >>On September 30, 2001 at 19:18:53, Miguel A. Ballicora wrote: >> >>>On September 30, 2001 at 17:14:38, Roy Eassa wrote: >>> >>>>On September 30, 2001 at 10:39:50, Miguel A. Ballicora wrote: >>>> >>>>>[D]8/4k1p1/1p2B2p/4p3/8/4P2P/1PP1KbP1/8 b - - am Bxe3; >>>> >>>> >>>>I think this is a good test. >>>> >>>>Gambit Tiger 2.0 on an Athlon 1.2 is smart enought to know right away that the >>>>pawn ending is not good, but takes a little while to avoid ...Bxe3: >>>> >>>>00:00:00.1 -0.60 12 210784 Bxe3 Kxe3 Kxe6 c4 h5 Ke4 g5 b4 >>>>00:00:00.8 -0.64 12 303820 Bxe3 Kxe3 Kxe6 c4 h5 Ke4 Kd6 g3 g5 b4 Ke6 >>>>00:00:01.7 -0.66 13 722703 Bxe3 Kxe3 Kxe6 c4 h5 g4 hxg4 hxg4 g6 b4 g5 Ke4 Kf6 c5 >>>>00:00:03.3 -0.68 14 1439003 Bxe3 Kxe3 Kxe6 c4 h5 g4 hxg4 hxg4 g6 b4 Kd6 Ke4 Ke6 >>>>g5 Kd6 c5+ bxc5 bxc5+ Ke6 >>>>00:00:07.4 -0.68 15 3460748 Bxe3 Kxe3 Kxe6 c4 h5 g4 hxg4 hxg4 g6 b4 Kd6 Ke4 Ke6 >>>>g5 Kd6 c5+ bxc5 bxc5+ Ke6 >>>>00:00:14.6 -0.74 16 6705228 Bxe3 Kxe3 Kxe6 c4 h5 Ke4 h4 b4 Kd6 c5+ bxc5 bxc5+ >>>>Ke6 c6 Kd6 c7 Kxc7 Kxe5 Kd7 >>>>00:00:54.4 -0.71 16 24860070 Bg1 Bc4 Kd6 Kf3 g5 g4 Kc5 Be6 Kd6 Bf7 Kc6 Bg8 Kc5 >>>>Ke4 Kd6 Bc4 >>>>00:01:28.5 -0.69 16 40056032 Bg3 Kf3 Be1 Bd5 Kd6 c4 >>>>00:01:55.6 -0.69 17 52088811 Bg3 Kf3 Be1 Bd5 Kd6 c4 Bd2 Ke4 g6 g4 Be1 b3 Bg3 Bf7 >>>>g5 Bd5 Bf2 >>>> >>>>Not as good as Crafty, but still better than many other engines. >>> >>>Here is a much tougher test from a real game >>>(A. Sokolov - Korchnoi Tilburg 1987) >>>Easy endgame? not quite! >>> >>>A. Sokolov miscalculated and made a mistake, played Rxc5? which ends up losing >>>easily. Rb8 puts up a much tougher resistance with good chances of drawing. >>> >>>[D]8/2p3pp/8/1RrkP3/8/3K4/6PP/8 w - - am Rxc5; >>> >>>Not even Crafty gets this right (15 min K6-II 400mhz) Probably >>>a problem evaluating the rook endgame because it sees a clear >>>disadvantage in the pawn endgame. >>> >>>Regards, >>>Miguel >> >> >>This is a different problem. Rxc5 goes into a lost ending with even material. >>Any other rook move drops a pawn, which looks just as bad. It thinks either >>case is probably losing... > >The pawn endgame is dead lost, which Crafty recognizes. The rook endgame >is difficult and White has a lot of drawing chances. In fact, most probably >it is a draw, particularly after Kxe5. White has a very active rook and there >are only two pawns left in the king side, the less the better for the defense. >The Black rook is in an awkard situation (in front of the pawn). The only good >thing for black is that it has an active king but that's it. >The advantage for black is certainly <1.0 pawns. It needs some analyisis because >I think that black can try something else than Kxe5. If it can reach a formation >with g6-h5-Re6-b6 then Black has great advantage. >I would certainly want that my engine plays Rb8 rather than Rxc5. I will collect >much more points in that way. > >Regards, >Miguel In this position you will. But remember, you are giving up a pawn voluntarily. You had better be right. Being a pawn down certainly makes the task of getting a whole point very difficult.
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