Author: Tord Romstad
Date: 10:51:58 08/17/03
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On August 16, 2003 at 18:34:26, Dan Andersson wrote: > Depth new >= depth old is a pretty crappy replacement scheme IMO. You risk >filling the hash with worthless nodes. And that will kill MTD(f) as it will mean >you have to do the same work repeatedly in the new null window search, and it >may harm other search implementations. I actually prefer a repalce always scheme >to that one. > Better to use a two slot scheme. Probe both slots for a hit. One slot is always >replace the other is depth or deeper. If you don't get a hit you replace >according to the two schemes. Thanks. I have now tried this, and indeed it works much better. Unfortunately the search still suddenly slows down after a few minutes, but I can now search one or two plies deeper before the wall appears. Tord
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