Author: Uri Blass
Date: 16:20:15 11/22/02
Go up one level in this thread
On November 22, 2002 at 19:16:59, Uri Blass wrote: >On November 22, 2002 at 18:57:06, Sune Fischer wrote: > >>On November 22, 2002 at 18:09:28, Uri Blass wrote: >> >>>previous version found Rxb2 only at depth 14 >>>With verified null move pruning movei finds wac 2 at depth 12. >>> >>>[D]8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - 0 1 >>> >>>depth=12 +0.64 b3b2 >>>Nodes: 6559172 NPS: 215975 >>>Time: 00:00:30.37 >>> >>>depth=12 +2.67 b3b2 d2b2 c4c3 b2b6 f6g7 b6b7 g7h6 b7b6 h6h5 b6b5 c3c2 b5f5 h5g6 >>>f5g5 g6h6 g5c5 d3d2 c5c6 h6h5 c6c5 h5h4 c5c2 d2d1q c2e2 >>>Nodes: 17674291 NPS: 212303 >>>Time: 00:01:23.25 >>> >>>depth=13 +3.54 b3b2 d2b2 c4c3 b2b6 f6g7 b6b7 g7h6 b7b6 h6h5 b6b5 c3c2 b5f5 h5g6 >>>f5g5 g6f6 g5c5 d3d2 c5c6 f6e7 c6c7 e7d6 c7c2 d2d1q c2e2 h7h5 >>>Nodes: 30679118 NPS: 220032 >>>Time: 00:02:19.43 >>> >>>Uri >> >>In my program nullmove delays it 1 ply, but it is still found faster. >>It seems to find it very early, for other reasons though. >> >>with nullmove: >> >>8 6 13 25569 1...c3 2.bxc3 Rxc3 3.e4 fxe4+ 4.Kxe4 Rc4+ 5.Kf3 Kf5 6.Rxd3 Rxf4+ >>7.Ke2 Rxd3 >>9 6 29 79390 1...c3 2.bxc3 Rxc3 3.e4 fxe4+ 4.Kxe4 Rc4+ 5.Ke3 Kf5 6.Rxd3 Rxf4 >>7.Rd6 >>9 5 68 234477 1...Rxb2 2.Rxb2 c3 3.Rb6+ Ke7 4.Rc6 c2 >>10 0 260 990857 1...Rxb2 2.Rxb2 c3 3.Rb6+ Kg7 4.Rb7+ Kh6 5.Rb6+ Kg7 >>11 0 667 2526638 1...Rxb2 2.Rxb2 c3 3.Rb6+ Kf7 4.Rb7+ Kf6 5.Rb6+ c2 Rh6 > >I do not understand what is the positional advantage that it finds for white. > >black has a clear positional adavnatge because black's pawns are more forward. >If it can be happy with a draw then it seems that it can see some positional >advantage for white > >Uri I guess that it evaluates a4 and h7 as weak pawns. Movei does not evauiate weak pawns. Uri
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