Author: Don Dailey
Date: 11:41:06 06/25/98
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On June 25, 1998 at 10:37:12, Robert Hyatt wrote: >On June 25, 1998 at 09:30:58, Ed Schröder wrote: > >>>Posted by Amir Ban on June 25, 1998 at 03:36:32: >> >>>I use the same procedure Don uses: Two killers, always replace, no counters. I >>>was surprised you guys think you have something better. Tests will decide, >>>true, but I'm not persuaded by the verbal arguments. It seems to me that >"always replace" should be equal at least. >> >>Same here. Tried all types of counters and other tricks to no avail. Always >>replace for Rebel is also superior. >> >>Like to add that the following worked for Rebel. After killer-one I use >>killer-one of 2 plies back, then killer-two and finally killer-two of >>2 plies back. This gave a speedup of 5% if I remember well. >> >>- Ed - >> >>>Amir > > >that worked in Cray Blitz, but we didn't use history moves there. In Crafty, >I try the two killers, then a couple of history moves, and if I haven't gotten >a cutoff by then, I stop wasting time and just take moves as they were >generated, to save time, since this is probably an ALL node anyway and won't get >a cutoff. > >My only comment on the counters is that it works better for me. It did in >Cray Blitz, and it does in Crafty. I tried both ways way back, but this was >always a little better... I'm not sure what is meant by "extra overhead of >counters" because it adds basically nothing. You don't have to "sort" with >two entries.. you always replace the last, and when you get a match on the >second one only, you bump the counter and possibly swap it with the first one >based on the two counter values. Not exactly time consuming. The counter idea is not very complicated but DOES require more logic and more memory. That's what I mean by more overhead. But the bottom line is that the two appear to be more or less equivalent in terms of results so I will probably stay with the simpler algorithm which is also more logical I believe. I'm all in favor of simplification! - Don
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