Author: Uri Blass
Date: 09:02:09 12/24/00
Go up one level in this thread
On December 24, 2000 at 10:29:40, Dieter Buerssner wrote: >On December 24, 2000 at 08:02:18, David Rasmussen wrote: > >>Actually, it has nothing to do with christmas, but here goes: >> >>8/8/5n1p/p1k1pBpP/1p2P1P1/1P2K3/P7/8 b - - 0 1 >> >... >>The line played was 1...Kb5 2. Kd3 a4 3. bxa4+ Kxa4 4. Kc4 Ka3 5. Kc5 Kxa2 6. >>Kxb4 Kb2 >> >>My problem is that Chezzz doesn't find this line. > >Neither does Yace. > >Now Chezzz is no genius, >>especially not in endgame situations, but when I run a search from the resulting >>position, it gives black a +0.60 advantage, so it should be able to see this. > >After the end of the line I get in under a minute a score of over 2.5 >in favor of black. > >>Never the less, from the starting position, after searching 15 plies deep, it >>still evaluates the position as 0.01 with a boring line of just moving the >>pieces around. > >In the position given, I get a score of 0.25 in favor of black, mainly >becuase of the color of pawns and the bishop. > >>How do other programs do in this position? It doesn't seem very difficult. > >Perhaps this line cannot be found by a chess engine. Mine wants to move >4. Ke3, and shows again a score of about -0.2. If I force Kc4, I get almost >immediately a score of about one in fovor of black. I think that the engines are right and I see no plan for black to win after Ke3 Here is a better hard test position from one of my games and I hope a correct one: [D]5k2/3b1p1p/2p3p1/2P1P1P1/3N1K1P/8/8/8 w - - 0 1 This position is from my game against another player. I played 49.e6 that is probably winning. I won the game after 49.e6 fxe6 50.Ke5 Ke7 51.Nc2 Kf7 52.Ne3 Bc8 53.Ng4 Kg7 54.Kd6 and after some more moves black resigned. I analyzed the game with my chess programs and they suggested 53...Ke7 that is a better defence but white can still win material and probably the game. For example 54.Nf6 Ba6 55.Nxh7 Be2 56.Nf6 Bf3 57.Kf4 Be2 58.Ne4 Bd1 59.Nc3 Bh5 60.Na2 Be2 61.Nb4 Bb5 62.Nc2 Bc4 63.Nd4 Bd5 64.Ke5 when black is in zunzwang is a possible comp-comp line. I think that white needs a lot of moves to put the king at e5 and the knight at d4 but black cannot prevent it. The question is if chess programs can find 49.e6 that seems to be the best move. Uri
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