Author: Peter Kasinski
Date: 13:12:15 06/29/98
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On June 29, 1998 at 15:26:15, Bruce Moreland wrote: > >On June 29, 1998 at 15:03:34, Peter Kasinski wrote: > >>Could someone please explain - what does "null move R=2" mean? >>I realize this is a naive question. I actually added (what I thought was) a >>null-move logic to my program and now I wonder. >>In my code I first try a NULL move at all levels of the tree provided that last >>move was not NULL and that a (basic) zugzwang-detection test is passed. > >Somewhere in your search you'll have a loop that will in most cases search this >positions successor moves to some distance, say for example, 6 plies. > >With null move R=2 you will search the null move to depth 4, as the first >successor move. > >You can try other values of R. Known to be in use are both 1 and 3. > >There seem to be two techniques for dealing with more than one null move in a >line. One is to not allow more than one in a line, if there is a null move >anywhere directly above you in the tree, you don't allow one now. The other is >to not allow two in a row. You seem to be doing the second one, which is >perfectly fine. > >bruce Indeed, and I will be curious to try int now with (the more speculative) R=2. Thanks again. PK.
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