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Less aggressive null move dynamic reduction

In null move search do not jump directly in
qsearch() from depth(4*OnePly), but only
from depth(3*OnePly).

After 999 games at 1+0: +248 -224 =527 +8ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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1 parent 8590a6f commit 17ef886fc32013fd5159484b8f9e547a5d183d59 @mcostalba committed Apr 10, 2009
Showing with 1 addition and 1 deletion.
  1. +1 −1 src/search.cpp
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2 src/search.cpp
@@ -1199,7 +1199,7 @@ namespace {
StateInfo st;
pos.do_null_move(st);
- int R = (depth >= 4 * OnePly ? 4 : 3); // Null move dynamic reduction
+ int R = (depth >= 5 * OnePly ? 4 : 3); // Null move dynamic reduction
Value nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);

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