Computer Chess Club Archives




Subject: Re: significant math

Author: Robert Hyatt

Date: 22:06:34 11/19/02

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On November 19, 2002 at 23:54:40, Dan Andersson wrote:

>I don't see how you can show that by comparing NPS of two wildly different
>programs. Suppose one of them has a more efficient evaluation function. There is
>no basis for comparision. Other than that they both play chess :)
>MvH Dan Andersson

Actually, at least for the case of Crafty and Yace, there is a good basis for
comparison.  They are relatively equal in playing strength.  So any advantage in
bitboards over arrays or vice-versa would seem to be _very_ minimal, which is
what I have generally claimed for 32 bit machines...

Not a great comparison, of course, but it at least suggests that on the PC,
isn't much difference.  Or take fritz vs a commercial program.  Fritz supposedly
is now a bitmap program.  Other commercial programs are not.  Yet there seems to
be little difference in overall strength.

Which lends more evidence to my "bitmaps are a break-even affair on 32 bit
machines" conclusion...

Of course, a "few" won't let such real data prevent them from producing heaps
of disinformation...

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