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Smaller null move reduction when depth is high

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Lower probability to miss something important.

It seems to increase strenght. Idea form Cyclone.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-11-09 13:03:52 +01:00
parent 3f610e2b13
commit e7bad2687a
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@@ -1148,7 +1148,8 @@ namespace {
UndoInfo u;
pos.do_null_move(u);
Value nullValue = -search(pos, ss, -(beta-1), depth-4*OnePly, ply+1, false, threadID);
int R = (depth > 7 ? 4 : 3);
Value nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);
pos.undo_null_move(u);
if (nullValue >= beta)