Author: Ralf Schäfer
Date: 13:24:16 03/15/04
Go up one level in this thread
On March 15, 2004 at 14:28:57, Dann Corbit wrote: >On March 15, 2004 at 14:20:19, Ralf Schäfer wrote: > >>On March 14, 2004 at 20:28:15, Bas Hamstra wrote: >> >>>This copy & paste from Shredder 5 is soooo cool. This is a tough position from >>>BS2830. I am curious how other engines do here. Tao 5.4 used to solve this in 2 >>>minutes but the latest version has a hard time here. >>> >>>[D] 2r1r3/p3bk1p/1pnqpppB/3n4/3P2Q1/PB3N2/1P3PPP/3RR1K1 w - - >>> >>> >>>Ciao! >>> >>>Bas. >> >>Hello Bas, >> >>I'm still surprised that my own engine Cheetah finds this move in 7 seconds at >>ply 7 - maybe 7 is its lucky number ;-) >> >>Here is the thinking output: >> >>Cheetah 0.73 WB2 64 MB: >> 1 00:00 0,85 Lb3xd5 >> 1 00:00 2,15 Lb3c2 >> 2 00:01 0,79 Lb3c2 Te8g8 >> 3 00:02 0,83 Lb3c2 Te8g8 Te1e2 >> 4 00:02 0,38 Lb3c2 Le7f8 Lh6d2 Lf8g7 >> 4 00:02 0,47 Lb3xd5 Dd6xd5 Td1d3 Te8g8 >> 4 00:02 0,49 Lb3a4 Le7f8 La4xc6 Tc8xc6 >> 4 00:03 0,53 Dg4h4 Kf7g8 Lb3c2 f6f5 >> 5 00:03 0,61 Dg4h4 Dd6d7 Lb3xd5 Dd7xd5 Dh4g4 >> 6 00:04 0,49 Dg4h4 Dd6d7 Td1c1 Kf7g8 Lh6d2 g6g5 >> 7 00:05 0,61 Dg4h4 Kf7g8 Td1c1 f6f5 Sf3g5 Le7xg5 Lh6xg5 >> 7 00:07 0,62 Te1xe6 Dd6xe6 Sf3g5+ f6xg5 Dg4f3+ De6f5 Lb3xd5+ Kf7f6 Ld5xc6 >>Df5xf3 >> 8 00:09 0,74 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 Sc6e5 d4xe5 Dd6c6 >> 9 00:11 1,15 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 Dd6d8 Dg4e6+ Kf7g7 Lb3xd5 >>Sc6a5 >>10 00:13 2,01 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+ >>Kf7f8 Te1xe7 >>10 00:17 2,01 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+ >>Kf7f8 >>11 00:21 0,90 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+ >>Kf7f8 Ld5xc6 Tc8xc6 >>11 00:52 0,90 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+ >>Kf7f8 >>12 00:54 1,16 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+ >>Kf7f8 Ld5xc6 Tc8xc6 >>12 02:56 1,16 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Lf4xd6 f5xg4 Lb3xd5+ >>Kf7f8 >>13 03:34 1,59 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+ >>Kf7f6 Lb3xd5 Sc6d8 b2b4 >>13 11:50 1,59 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+ >>Kf7f6 >>14 14:31 1,80 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+ >>Kf7f6 Lb3xd5 Sc6d8 g2g3 >>14 54:43 1,80 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 f6f5 Dg4h3 Dd6xf4 Dh3xh7+ >>Kf7f6 >>15 01:05:54 1,60 Te1xe6 Dd6xe6 Td1e1 De6d6 Lh6f4 h7h5 Dg4xc8 Te8xc8 Lf4xd6 >>Le7xd6 Lb3xd5+ Kf7g7 > >Can you dump your evaluation terms to say why your engine picked the move so >quickly? > >I am guessing king safety? Hi Dan, well, I think that its king safety will help to find the move fast, but maybe this is not the only reason. After playing the moves from ply 15 Cheetah sees the passed pawn on the d-file, at this point the king-safety is turned off because there are too little pieces on the board (Cheetah needs 4 pieces or 2 pieces and a queen for doing king safety) Cheetah's king-safety is a lighter version from Rebel's king safety which is described on his page, so it is interesting if Rebel can find this move too... best wishes Ralf
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