Author: Robert Hyatt
Date: 07:23:06 03/20/01
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On March 20, 2001 at 05:32:20, Tony Werten wrote: >On March 19, 2001 at 13:57:17, Bruce Moreland wrote: > >>On March 19, 2001 at 12:38:06, Miguel A. Ballicora wrote: >> >>>I just implemented in my program "Gaviota" the ability to process a epd file >>>as a test. So I ran WAC in AMD K6-2 400 mhz 20 seconds each position >>>and it solved 264 out of 300. How bad/good is that for a program that is ~2000? >>> >>>Regards, >>>Miguel >> >>If you mean does that correlate, I'd guess it does. The stronger programs will >>easily get somewhere over 290 in that time. >> >>It does suggest that you have some opportunity for improvement. My guess is >>that you can still improve effective tactical speed by a factor of 20 or so. >> >>Recapture extension will help, as will null move R=2 if you are not doing it, >>and a single-response-to-check extension. > >The last 2 are sure things, but be carefull with the first one. The >recaptureextensions seem to be very program dependent. I took them out about a >year ago and saw an improvement. > >They are the easiest to implement though so you should give them a try. They >seem to help for smaller evaluationfunctions. > >cheers, > >Tony I agree. How well they "work" often depends on how they are tested. IE recapture on (crafty) solves the Bratko-Kopec position 22 (Bxe4) in 6 plies. With it off, it takes 8 plies. Doesn't take much more time however. But in games, I played several _thousand_ with recap on vs recap off. Recap off won over 10% more of the games than recap off. That isn't a huge difference, but it is a significant difference. I've had it off for a month or two now. > >> >>bruce
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