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Increase null reduction at high depths

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Linear rule, less aggressive then Dann's one.

It seems it scales well with depth. We will need to
verify against weaker engine if it keeps the score.

After 999 games at 1+0 on my Dual Core
Mod vs Orig +232 =534 -207  +9 ELO

After 1000 games by Martin Thoresen on his QUAD at 1+0
Mod vs Orig 521/479 52.10%

Functionality Signature: 17655312

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-12-31 11:54:26 +01:00
parent d11af1de11
commit 860260c3b1
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1376,7 +1376,7 @@ namespace {
pos.do_null_move(st);
// Null move dynamic reduction based on depth
int R = (depth >= 5 * OnePly ? 4 : 3);
int R = 3 + (depth >= 5 * OnePly ? depth / 8 : 0);
// Null move dynamic reduction based on value
if (approximateEval - beta > PawnValueMidgame)