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Retire LMR intermediate research

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It does not seem to improve anything.

After 8344 games Mod - Orig:
1362 - 1321 - 5661 ELO +2

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-12-20 16:42:07 +01:00
parent 0007b43a91
commit 3346ccc9d9
1 changed files with 0 additions and 25 deletions
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25
src/search.cpp
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@ -828,18 +828,6 @@ namespace {
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, 1);
doFullDepthSearch = (value > alpha);
}
// The move failed high, but if reduction is very big we could
// face a false positive, retry with a less aggressive reduction,
// if the move fails high again then go with full depth search.
if (doFullDepthSearch && ss->reduction > 2 * ONE_PLY)
{
assert(newDepth - ONE_PLY >= ONE_PLY);
ss->reduction = ONE_PLY;
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, 1);
doFullDepthSearch = (value > alpha);
}
ss->reduction = DEPTH_ZERO; // Restore original reduction
}
@ -1347,19 +1335,6 @@ split_point_start: // At split points actual search starts from here
doFullDepthSearch = (value > alpha);
}
// The move failed high, but if reduction is very big we could
// face a false positive, retry with a less aggressive reduction,
// if the move fails high again then go with full depth search.
if (doFullDepthSearch && ss->reduction > 2 * ONE_PLY)
{
assert(newDepth - ONE_PLY >= ONE_PLY);
ss->reduction = ONE_PLY;
alpha = SpNode ? sp->alpha : alpha;
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, ply+1);
doFullDepthSearch = (value > alpha);
}
ss->reduction = DEPTH_ZERO; // Restore original reduction
}