Author: Angrim
Date: 07:04:08 07/29/03
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On July 29, 2003 at 03:44:42, Rick Bischoff wrote: >Hi all, > >I am getting the following statistic from my program: > ><pre> > 0/18 0 1426407 Ke6 h3 Kd5 Rg2 Kc5 h4 Kb5 h5 Ka5 h6 Ka6 >move found: 85570 not found: 118 ></pre> > >Which means of the 88570 times the hashtable didn't have a good value, it still >had a good move to try first; the other 118 times it didnt have a good value, >it had an illegal move... Is this the kind of percentage you all see in your >engines? So 118 out of 88570 times that you thought you had a match from the hash table, it turned out that not only was it not a match, but the move stored wasn't even legal. so a false match rate higher than 1 in 750. That is absurdly high. This is slightly better than I would expect if you were using a 16 bit hash key, but not much. With a 64 bit hash key, and a large hash table, you should be getting one false match every few days. The odds of a false match giveing an illegal move are even worse, since the same move may be legal in many different positions. Angrim
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