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Remove intermediate re-search in LMR

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STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 20149 W: 3830 L: 3707 D: 12612

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 45384 W: 7089 L: 7006 D: 31289

Bench: 8110365

Resolves #361
This commit is contained in:
Vince Negri 2015-05-31 10:52:41 +01:00 • committed by Joona Kiiski
parent c1d3bd2dba
commit 7b8ffe0f5d
1 changed files with 0 additions and 7 deletions
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7
src/search.cpp
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@ -975,13 +975,6 @@ moves_loop: // When in check and at SpNode search starts from here
value = -search<NonPV, false>(pos, ss+1, -(alpha+1), -alpha, d, true); value = -search<NonPV, false>(pos, ss+1, -(alpha+1), -alpha, d, true);
// Re-search at intermediate depth if reduction is very high
if (value > alpha && ss->reduction >= 4 * ONE_PLY)
{
Depth d2 = std::max(newDepth - 2 * ONE_PLY, ONE_PLY);
value = -search<NonPV, false>(pos, ss+1, -(alpha+1), -alpha, d2, true);
}
doFullDepthSearch = (value > alpha && ss->reduction != DEPTH_ZERO); doFullDepthSearch = (value > alpha && ss->reduction != DEPTH_ZERO);
ss->reduction = DEPTH_ZERO; ss->reduction = DEPTH_ZERO;
} }