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Null move dynamic reduction based on value

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After 994 games at 1+0

Mod vs Orig +244 =521 -229 50.75%  504.5/994 +5 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-11-13 11:25:34 +01:00
parent a530fc2b60
commit 314faa905a
1 changed files with 7 additions and 1 deletions
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8
src/search.cpp
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@ -1314,7 +1314,13 @@ namespace {
ss[ply].currentMove = MOVE_NULL; ss[ply].currentMove = MOVE_NULL;
pos.do_null_move(st); pos.do_null_move(st);
int R = (depth >= 5 * OnePly ? 4 : 3); // Null move dynamic reduction
// Null move dynamic reduction based on depth
int R = (depth >= 5 * OnePly ? 4 : 3);
// Null move dynamic reduction based on value
if (approximateEval - beta > PawnValueMidgame)
R++;
nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID); nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);