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Subject: Re: What does R=2 or R=3 mean in Null searches?

Author: Don Dailey

Date: 13:54:10 06/15/98

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On June 15, 1998 at 15:51:10, Steve Maughan wrote:

>>Now that i use R=3 instead of R=2 i still  see the difference
>>between zero window of nullmove anymore, but less than with R=2.
>What does the "R" stand for?  I understand the basics of Null move but do not
>understand what R=2 or R=3 means.
>Steve Maughan

R is the depth Reduction factor.  I think most of todays programs use
R of 1, 2 or 3.  If your program is at a node where it needs to search
7 ply, we may do a null move followed by a 5 ply search.  This would
be using a "Reduction" factor of 2.

- Don

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