Author: Andrei Fortuna
Date: 17:57:02 03/23/00
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On March 22, 2000 at 14:27:45, Ernst A. Heinz wrote: >Hi Andrei, > >>In my chess program Freyr I've used simple alpha beta from the start, each time >>I tried to change it to pvs/negascout it didn't work as expected because it >>just generated too many nodes. Does anyone else experienced this behavior ? >>Is there a logical explanation for this ? > >PVS requires good move ordering to work well. Otherwise, the frequent >researches kill its performance. > >Assuming that your PVS implementation is okay, I would conjecture that >your move ordering represents the limiting factor here. I found my problem. My move ordering is not very bad, but I had a bad quiescence function which was sometimes bailing out too soon. I rewrote it and now pvs performs better than plain AB.
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