Author: Stuart Cracraft
Date: 11:49:41 09/11/04
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On September 11, 2004 at 12:13:36, Sune Fischer wrote: >On September 11, 2004 at 00:08:20, Stuart Cracraft wrote: > >>Hi, >> >>I added keeping a triangular pv in main search and quiescence >>to compare it with the output of my walk-the-hashtable-pv. >> >>The two differ frequently but quite often are also mostly >>identical all the way through. > >Don't forget to check the hash flag, that the moves are actually PV moves. > >Mostly you get them overwritten with upper or lower moves, those should not go >in the PV. > >>Which should I trust? Seems like the hash table is getting >>overwritten with other variations (not sure why). What >>kind of scenario would cause that? My algorithm is >>length >= depth to replace. > >That's not a very good replacement scheme, if you only have a single bin I'd >recommend using replace always. This gave a nice improvement on a Thinkpad laptop of 237 solved of WAC @ 1 second per, to 244. I guess recency is more important than depth!!! I don't know why I never even considered to replace always. Didn't even test it. I always had assumed that depth was more important than recency. Bad assumption Nowadays, do most use 2-tier or ? If so or whatever, what are the preferred replacement algorithms? Thanks, Stuart
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