Author: Laurence Chen
Date: 18:03:24 12/24/00
Go up one level in this thread
On December 24, 2000 at 12:02:09, Uri Blass wrote: >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 Here's S5 analysis after 2 hours in my PIII 600e with 256 MB Hash Table: Engine: Gambit Shredder by Stefan Meyer-Kahlen position: bm e6; 12.01 0:01 +0.84 1.Ke4 Ke7 2.Ke3 Kf8 3.Kf4 Ke7 4.Ke4 Ke8 5.Ke3 Ke7 (280.441) 183.1 13.01 0:02 +0.84 1.Ke4 Ke7 2.Ke3 Kf8 3.Kf4 Ke7 4.Ke4 Ke8 5.Ke3 Ke7 (467.717) 168.4 14.01 0:05 +0.82 1.Ke4 Ke7 2.Ke3 Kd8 3.Nb3 Be6 4.Na5 Kc7 5.Ke4 Kd7 6.Kd4 Bc4 (936.422) 164.2 15.01 0:13 +0.82 1.Ke4 Ke7 2.Kf3 Kf8 3.Kf4 Ke7 4.Ke4 Kd8 5.Ke3 Kc7 6.Ke4 Bh3 7.Ne2 Bf5+ 8.Kd4 (2.301.160) 174.7 16.01 0:22 +0.74 1.Ke4 Ke7 2.Kf3 Kd8 3.Kf4 Kc7 4.Nb3 Be6 5.Nd2 Bd5 6.Ne4 Bxe4 7.Kxe4 Kd8 8.Kd4 Kd7 9.Ke3 Ke8 10.Kf4 Kd7 11.Ke4 Ke6 12.Ke3 Kxe5 13.Kd2 f5 14.Kc1 (3.631.322) 160.1 17.01 0:39 +0.74 1.Ke4 Ke7 2.Kf3 Kd8 3.Kf4 Kc7 4.Nb3 Be6 5.Nd2 Bd5 6.Ne4 Bxe4 7.Kxe4 Kd8 8.Kd4 Kd7 9.Ke3 Ke8 10.Kd4 Kd7 11.Ke3 (6.155.481) 154.6 17.03 0:42 +0.75++ 1.Nb3 Bh3 2.Na5 Bg2 3.Nc4 Ke7 4.Ke3 Kd7 5.Nd6 Ke6 6.Kd4 Bd5 7.Ne8 Ba2 (6.739.666) 158.0 17.03 0:43 +0.75 1.Nb3 Bh3 2.Na5 Bg2 3.Nc4 Ke7 4.Ke3 Kd7 5.Nd6 Ke6 6.Kd4 Bd5 7.Ne8 Ba2 8.Nc7+ Kd7 9.Ne6 (6.845.751) 158.9 18.01 1:04 +0.69 1.Nb3 Bh3 2.Na5 Bg2 3.Nc4 Ke7 4.Ke3 Kd7 5.Nd6 Ke6 6.Kd4 Bd5 (10.084.600) 155.4 18.02 1:21 +0.70++ 1.Ke4 Ke7 2.Kf3 Kd8 3.Kf4 Kc7 (11.134.057) 136.8 18.02 1:35 +0.74 1.Ke4 Ke7 2.Kf3 Kd8 3.Kf4 Kc7 4.Nb3 Bh3 5.Ke4 Kd7 6.Kd4 Be6 7.Na5 Bg4 8.Nc4 Be2 9.Nd6 Bb5 10.Nxf7 Ke6 11.Nd6 Kd7 (13.687.983) 143.1 19.01 2:35 +0.74 1.Ke4 Ke7 2.Kf3 Kd8 3.Ke3 Ke7 4.Ke4 Kf8 5.Kf4 Ke7 6.Kf3 Kd8 (21.481.784) 137.7 19.02 2:43 +0.75++ 1.Nb3 Bh3 2.Na5 Bg2 3.Nc4 Ke7 4.Ke3 Kd7 5.Nd6 Ke6 6.Kd4 Bd5 (22.803.993) 139.1 19.02 2:45 +0.75 1.Nb3 Bh3 2.Na5 Bg2 3.Nc4 Ke7 4.Ke3 Kd7 5.Nd6 Ke6 6.Nb7 (23.153.849) 140.0 20.01 3:57 +0.72 1.Nb3 Be6 2.Na5 Bd5 3.Nb7 Ke7 4.Nd6 Bg2 5.Ke3 Bd5 6.Kd4 Ke6 7.Ne8 Kf5 8.Nf6 Bg2 9.Ke3 (32.572.872) 136.9 20.02 4:25 +0.73++ 1.Ke4 Ke7 2.Kf3 Kd8 3.Ke3 Ke7 4.Ke4 Kf8 5.e6 fxe6 6.Nb5 (35.332.094) 132.9 20.02 4:40 +0.74 1.Ke4 Ke7 2.Kf3 Kd8 3.Ke3 Ke7 4.Ke4 Kf8 5.e6 fxe6 6.Nb5 (38.117.166) 136.0 20.11 5:45 +0.75++ 1.e6 fxe6 2.Nf3 Ke7 3.Ke5 Be8 4.Nh2 Kf8 (46.453.949) 134.3 20.11 5:55 +0.90 1.e6 fxe6 2.Nf3 Ke7 3.Ke5 Be8 4.Nh2 Bd7 5.Ng4 Bc8 6.Nf6 Bb7 7.Nxh7 Ba6 8.Nf6 Be2 9.Ne4 Bf3 (47.861.362) 134.4 21.01 6:30 +0.90 1.e6 fxe6 2.Nf3 Ke7 3.Ke5 Be8 4.Nh2 Bd7 5.Ng4 Bc8 6.Nf6 Bb7 7.Nxh7 Ba6 8.Nf6 Be2 9.Ke4 Bd1 (50.769.818) 130.0 22.01 8:16 +0.90 1.e6 fxe6 2.Nf3 Ke7 3.Ke5 Be8 4.Nh2 Bd7 5.Ng4 Bc8 6.Nf6 Bb7 7.Ng4 Ba6 8.Nf6 Kf8 9.Kxe6 h5 (63.985.569) 128.9 23.01 10:35 +0.90 1.e6 fxe6 2.Nf3 Ke7 3.Ke5 Be8 4.Nh2 Bd7 5.Ng4 Bc8 6.Nf6 Bb7 7.Ng4 Ba6 8.Nf6 Kf8 9.Kxe6 h5 (84.641.320) 133.1 24.01 14:37 +0.90 1.e6 fxe6 2.Nf3 Ke7 3.Ke5 Be8 4.Nh2 Bd7 5.Ng4 Bc8 6.Nf6 Bb7 7.Ng4 Ba6 8.Nf6 Bb5 (122.499.975) 139.5 25.01 31:37 +0.82 1.e6 fxe6 2.Nf3 Bc8 3.Ke4 Ke7 4.Ne5 Bb7 5.Kd4 Kf8 6.Ng4 Ke7 7.Ke5 Ba6 8.Nf6 Be2 9.Nxh7 (314.525.748) 165.7 26.01 91:09 +0.82 1.e6 fxe6 2.Nf3 Bc8 3.Ke4 Ke7 4.Ne5 Bb7 5.Kd4 Kf8 6.Ng4 Ke7 7.Ke5 Ba6 8.Nf6 Be2 9.Nxh7 (1.042.315.787) 190.5 Regards, Laurence
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