Author: Uri Blass
Date: 02:01:55 05/05/04
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On May 05, 2004 at 04:40:43, Andrew Williams wrote: >On May 05, 2004 at 03:03:15, Daniel Shawul wrote: > >>Hello >> >>Is incremental attack table slower than creating them on fly? >>I have both versions working properly right now but the incremental >>one further drops NPS by 30% , though InCheck and Checks are for free in this >>case. Anybody have similar experience? I am sure i have made no mistake in >>updating because i checked it with the known perft positions and node count is >>perfect. >> >>best >>daniel > >It's a very long time since I implemented them, but at the time I compared the >incremental ones were faster. I can't remember exactly how much faster it was, >but I think it was of the order of 10 to 15%, if only because that is what a >comment in an old source file says. What I don't know is if this was *after* >thorough debugging. > >Andrew I have different attack tables. Last time that I implemented incremental tables was a long time ago before I had a chess program. I did not make notes to see how much faster it was but it was more than being 1000% faster in calculating perft. Uri
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