Author: Martin Giepmans
Date: 15:22:46 11/26/02
Go up one level in this thread
On November 26, 2002 at 17:41:44, Martin Giepmans wrote: >On November 26, 2002 at 17:21:28, David Rasmussen wrote: > >>[D]r4rk1/1p1n1pp1/1bq1bn1p/2pp4/p1P1N1P1/1N1PB2B/PPQ2P1P/R4RK1 w - - 3 19 >> >>This position was one the leaf positions during search of the previously posted >>position, that produced the most qnodes. Searching this position is even worse: >> >>time nodes depth score pv >>00:00:43.33 17Mn 01/01/17 +0.194 19. cxd5 axb3 20. dxc6 bxc2 >> 21. cxd7 Rxa2 22. Bxc5 >>00:00:43.36 17Mn 01/02/17 --------------------------------------------------- >> >> >> Time used: 00:00:43.36 >> nps: 407748 nodes: 17684031 Q-nodes: 17683987 (99%) >> move order: 66% >> hash probes: 1 hash hits: 0 (0%) hash usage: 0% >> pawn hash probes: 17684030 pawn hash hits: 17683997 (99%) >> EGTB probes: 0 EGTB hits: 0 (0%) >> >>I takes 43 seconds to finish ply 1! >>As it can be seen from the output, there aren't any extensions going on here. >>But the longest q-search line is to ply 17! >>There's definitely something wrong here... :) >> >>/David > >Yes, must be a bug. With pruning in Qsearch disabled I need 77854 nodes >to finish depth 5 .... > >Martin I see now that after 19. cxd5 axb3 20. dxc6 bxc2 21. cxd7 Rxa2 22. Bxc5 (your PV) white and black have a pawn that can promote (c2, d7). Could that be the cause of the trouble? Martin
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