Author: Will Singleton
Date: 12:03:08 05/04/99
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On May 04, 1999 at 13:07:42, KarinsDad wrote: >On May 04, 1999 at 12:40:05, Andrew Williams wrote: > >>On May 04, 1999 at 11:26:29, KarinsDad wrote: >> >>>I was wondering how deeply most programs extended the search at a given ply for >>>check. >>> >>>I implemented singular extensions, check extensions, and capture extensions into >>>my code last night, but ran into the problem of check extensions potentially >>>expanding the extensions into near infinity. >>> >>>How many checks do most programs consider is enough when extending? >>> >>>Thanks, >>> >>>KarinsDad :) >> >>My program simply says "if the iterative deepener started this search >>with depth=D, don't extend beyond 2*D". This is a naive approach, and >>I'd also be interested in hearing what anyone else does. > Sometimes the simple approach is the best. In mine (which I'm sure is not the best), I simply limit total extensions to 6 beyond depth. But I also consider some checks in the qsearch. >Yes, this sounds naive since I especially do not want to check 14 ply down when >I am currently searching Ply 14. I was thinking more along the lines of 8 ply >(if you do not get an advantage within 4 moves, then maybe it isn't worth >checking), but I am not sure. >> >>> >>>PS. Will, we realized that our nps is way off. We were compiling the code in >>>debug mode as opposed to optimized mode. So, our 100 knps went up to 209 knps. >>>Duh! >> >>209knps!! What position? > >This is on a P3 400 Mhz with super simple material evaluation code (for a lot of >positions, the program is still real stupid). It will drop in half at least once >I really implement the evaluation. > >> >>Andrew The most nps I get is around 90k, in the endgame. Avg around 60k on a mac 300. Even with a material only eval, I don't approach your numbers. You must be doing something right! btw, it's possible that you'll see reduced node counts due to increased cutoffs when you add some positional stuff. Will
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