Author: James Robertson
Date: 12:28:19 05/04/99
Go up one level in this thread
On May 04, 1999 at 15:03:08, Will Singleton wrote: > >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 On my P233 I get about 120k NPS in most middlegame positions. In the endgame, I get 200-270k NPS. With material only, I got greater than 300k. James
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