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Prune all negative see moves at low depths

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After 2036 games Mod- Orig:
381 - 278 - 1377 ELO +17 (+- 6.2) LOS 99%

One of the biggest increases ever !

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-11-30 14:46:41 +02:00 • committed by Marco Costalba
parent 6ed409ecee
commit 5529706426
1 changed files with 11 additions and 0 deletions
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11
src/search.cpp
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@ -1287,6 +1287,17 @@ split_point_start: // At split points actual search starts from here
continue;
}
// Prune neg. see moves at low depths
if ( predictedDepth < 2 * ONE_PLY
&& bestValue > value_mated_in(PLY_MAX)
&& pos.see_sign(move) < 0)
{
if (SpNode)
lock_grab(&(sp->lock));
continue;
}
}
// Step 13. Make the move