Author: Robert Hyatt
Date: 21:22:28 07/23/02
Go up one level in this thread
On July 23, 2002 at 19:40:59, John Merlino wrote: >On July 23, 2002 at 19:31:10, John Merlino wrote: > >>On July 23, 2002 at 18:32:27, Robert Hyatt wrote: >> >>>A few years ago, Komputer Korner had a "correspondence kup" match with Crafty, >>>chessmaster and some other programs, playing a correspondence tournament. In >>>that match, Crafty found a wild sacrifice to play against Chessmaster, I think >>>it was Nf6. After searching for 24 hours or whatever the time limit was, Crafty >>>saw a draw score. And it saw a draw score for the next couple of moves. >>> >>>Right after Crafty played that move, Hsu sent me an email saying "brilliant >>>move". I told him Crafty only saw a draw. He said "let it keep searching... >>>DB Jr saw +2.5 very quickly." Sure enough, a few moves later Crafty realized >>>it was not just drawing, it was winning easily. >>> >>>I will try to find the game. If anybody has it, perhaps _that_ position will >>>be a good one to see how long it takes today's programs to find the move and >>>find it is winning, compared to DB1 back in 1996... >>> >>>I will see what I can find... >>> >>>I think the event was called "the komputer kup korrespondence tournament" or >>>something similar... >> >>Assuming Pierre's position is correct, Chessmaster 9000, on a PIII-600, finds >>Nf6+ in 1:16, giving it a drawing score. After 3:15, the score is positive, but >>nowhere near "winning". >> >>Time Depth Score Positions Moves >>0:00 1/4 -0.41 11390 19.Bh6 Re6 20.Bg5 Nd4 21.Qd3 >>0:00 1/5 -0.64 37849 19.Bh6 Re6 20.Be3 Nd4 21.Bxd4 exd4 >>0:01 1/5 -0.46 67804 19.Bg3 Nd4 20.Qe4 Qb8 21.Rac1 Bf5 >>0:02 1/6 -0.42 111216 19.Bg3 Nd4 20.Qh5 Be6 21.Bxe5 Bxd5 >> 22.Bxd4 >>0:04 1/6 -0.37 203824 19.Bh6 Re6 20.Be3 Nd4 21.Bxd4 Bxd4 >>0:06 1/7 -0.56 341780 19.Bh6 Re6 20.Be3 Nd4 21.Bxd4 exd4 >> 22.Rac1 Re5 >>0:13 1/7 -0.52 692298 19.Re1 Kh8 20.Nc3 Qc7 21.Bxe5 Rxe5 >> 22.Rxe5 Qxe5 23.Qxc6 >>0:16 1/7 -0.35 936839 19.Be3 Nd4 20.Bxd4 Bxd4 21.Nf6+ >> gxf6 22.Bd5 Bxf2+ 23.Qxf2 >>0:25 1/8 -0.16 1540653 19.Be3 Be6 20.Rac1 Kh8 21.Bxc5 >> bxc5 22.Rxc5 Nd4 23.Qa3 Rac8 24.Rdc1 >> Rxc5 25.Rxc5 >>0:48 1/9 -0.41 3195206 19.Be3 Be6 20.Rac1 Rad8 21.Bxc5 >> bxc5 22.Rc2 Bxd5 23.Bxd5 e4 >>1:02 1/9 -0.30 4191467 19.Bh6 Re6 20.Be3 Nd4 21.Bxd4 Bxd4 >> 22.Rac1 e4 23.Qe2 >>1:16 1/9 0.00 5345593 19.Nf6+ gxf6 20.Bd5 Bd7 21.Bh6 >> Bf8 22.Qxf6 Re6 23.Bxe6 fxe6 24.Qg5+ >> Kh8 25.Qf6+ Kg8 >>1:35 1/10 0.00 6997334 19.Nf6+ gxf6 20.Bd5 Bd7 21.Bh6 >> Bf8 22.Qxf6 Re6 23.Bxe6 fxe6 24.Qg5+ >> Kh8 25.Qf6+ Kg8 >>3:15 2/11 0.27 15441083 19.Nf6+ gxf6 20.Bd5 Bd7 21.Bh6 >> Bf8 22.Qxf6 Re6 23.Bxe6 Bxe6 24.Ra3 >> Bxh6 25.Rg3+ Kf8 26.Qxh6+ Ke7 27.Qh4+ >> f6 28.Qxh7+ Bf7 >>10:15 3/12 0.36 53030403 19.Nf6+ gxf6 20.Bd5 Bd7 21.Bh6 >> Bf8 22.Qxf6 Re6 23.Bxe6 Bxe6 24.Ra3 >> Ne7 25.Bxf8 Rxf8 26.Rg3+ Ng6 27.Qxe5 >> >>jm > >After forcing a few key moves, the problem move appears to be 22.Ra3. I suspect >that The King engine would need to get to depth 16 for the eval to go above +1, >which, of course, would take several hours on my machine. Still, though, it >looks like it has the right plan as soon as it sees Nf6+. > >jm You are doing a bit better than me. On my laptop (750mhz) it takes Crafty (current version) 7 minutes to find Nf3+. Score is 0.00 when it finds it at depth 12, up from -.35 good for black. I am going to let it smoke along for a bit to see if it will go positive, but I believe that the version playing in the KKUP event went to depth=16 with drawscore so I doubt the current version will actually find that... It used to take depth=16, with an 8 hour time limit on a pentium pro 200, so with today's faster hardware, perhaps it might see more than 0.00 in a bit...
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