Author: David Rasmussen
Date: 16:20:37 12/19/01
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On December 19, 2001 at 16:23:44, Severi Salminen wrote: >>One of the move ordering stats I keep track of is the ratio of >>fail highs on the first mv vs. the number of total fail highs. >>Previously this number has been at 87% for the first 100 problems >>of the Win at Chess suite. (My eval is so simple I don't bother >>testing more than that yet. :) ) >> >>With a pretty kludgy null search with R=2, I'm getting a few more >>problems right, and searching a little deeper on average. An >>observation I made, though, is that the ratio mentioned above fell >>to 78% - a delta of 9%. > >I get something like 96% with nullmoves and 99% without. But this was only one >position (after 1.e4 e5 2.d4 d5). I don't use hashtables yet, which will improve >the figures even more. 78% is way too low, but the reason is probably poor >ordering, not nullmove itself. > >Severi Either you have extremely good move ordering, you have a bug, or you're counting in quiescence search also, which is "cheating". 96% is very very high. Crafty gets 90% here. /David
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