Author: Vincent Diepeveen
Date: 11:37:22 10/31/05
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On October 31, 2005 at 12:53:33, Robert Hyatt wrote: >On October 30, 2005 at 04:21:05, Mridul Muralidharan wrote: > >>On October 28, 2005 at 22:32:05, Robert Hyatt wrote: >><snip>> >>>Now it is "dubious forward pruning won't work". Of course, Shredder, Fruit, >>>Zappa, Chess Tiger, and others all apparently have it working quite well... >> >>Are you sure that Zappa is using forward pruning ? >>I did not see Anthony Cozzie mention this anywhere (for WCCC'05) ... >>Ofcourse , I am not talking about null move here. >> >>- Mridul > > >He had mentioned it somewhere along the way, yes. I think that was the addition >to produce zappa 2.0... Anthony can comment, but the search depths he has >reported during the WCCC certainly support that as well... > >Any program that is going beyond 14 or 15 plies in middlegame positions is doing >forward pruning beyond pure null-move... Bob, perhaps start reading back old postings. Your memory is in a far state of deterioration. Zappa got 14-15 ply first moves out of book at 4 processors with 3.3 - 4 million nps. So if you would say he's getting that with singular extensions turned on, then that makes more sense than saying he's getting that with forward pruning other than nullmove. Fruit single cpu at 1 mln nps is getting typically 16-17 ply in those positions. First move out of book Zappa was obviously outsearched many plies by about everyone. Vincent
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