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See prune at higher depth

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Allow SEE pruning at higher depths in shallow depth
pruning using a threshold increasing with depth.

STC
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 35366 W: 7011 L: 6724 D: 21631

LTC
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 15578 W: 2243 L: 2070 D: 11265

Bench: 8417887
This commit is contained in:
Stefano80 2016-07-23 09:49:18 +02:00 • committed by Marco Costalba
parent 76971d8acb
commit 714329dbdc
1 changed files with 10 additions and 3 deletions
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13
src/search.cpp
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@ -930,9 +930,16 @@ moves_loop: // When in check search starts from here
&& ss->staticEval + futility_margin(predictedDepth) + 256 <= alpha)
continue;
// Prune moves with negative SEE at low depths
if (predictedDepth < 4 * ONE_PLY && pos.see_sign(move) < VALUE_ZERO)
continue;
// Prune moves with negative SEE at low depths and below a decreasing
// threshold at higher depths.
if (predictedDepth < 8 * ONE_PLY)
{
Value see_v = predictedDepth < 4 * ONE_PLY ? VALUE_ZERO
: -PawnValueMg * 2 * int(predictedDepth - 3 * ONE_PLY);
if (pos.see_sign(move) < see_v)
continue;
}
}
// Speculative prefetch as early as possible