Author: Tord Romstad
Date: 10:49:38 05/26/04
Go up one level in this thread
On May 26, 2004 at 13:34:23, Robert Hyatt wrote: >I have used "IID" for years, but in a very restricted way, namely to handle the >case along the PV where I have no hash move. I've never tried it _everywhere_ >before, so have no data. But I intend to try to see if it is something that >could work, or if it is a waste... I am fairly sure you will find that _everywhere_ is a waste. It is probably not worth doing near the leaf, you have a hash table move to search, or when a fail-low is most likely. Perhaps you should also use a somewhat bigger reduction factor than in your "along-the PV IID". Note that it could also be interesting to look for good ways to make use of the return value of the internal search. It gives a reasonably reliable estimate of the value of a full-depth search, and can be useful as an ingredient in pruning tricks. The most obvious (and entirely risk-free) case is when the reduced-depth search returns a mate score. When this happens, it is clearly not necessary to do a full-depth search. Tord
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