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Removes evasionPrunable

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STC:
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 25656 W: 4979 L: 4826 D: 15851
Ptnml(0-2): 414, 2971, 5964, 3006, 473
https://tests.stockfishchess.org/tests/view/5e93dbd72cb65b3059c33819

LTC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 43732 W: 5656 L: 5593 D: 32483
Ptnml(0-2): 324, 4072, 13009, 4139, 322
https://tests.stockfishchess.org/tests/view/5e93e37c2cb65b3059c33825

closes https://github.com/official-stockfish/Stockfish/pull/2627

Bench: 4702195
This commit is contained in:
silversolver1
2020-04-12 22:23:04 -05:00
committed by Joost VandeVondele
parent db59696aaf
commit de9fc53af5
1 changed files with 2 additions and 8 deletions
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10
src/search.cpp
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@@ -1398,7 +1398,7 @@ moves_loop: // When in check, search starts from here
Move ttMove, move, bestMove; Move ttMove, move, bestMove;
Depth ttDepth; Depth ttDepth;
Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha; Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha;
bool ttHit, pvHit, inCheck, givesCheck, captureOrPromotion, evasionPrunable; bool ttHit, pvHit, inCheck, givesCheck, captureOrPromotion;
int moveCount; int moveCount;
if (PvNode) if (PvNode)
@@ -1527,14 +1527,8 @@ moves_loop: // When in check, search starts from here
} }
} }
// Detect non-capture evasions that are candidates to be pruned
evasionPrunable = inCheck
&& (depth != 0 || moveCount > 2)
&& bestValue > VALUE_TB_LOSS_IN_MAX_PLY
&& !pos.capture(move);
// Don't search moves with negative SEE values // Don't search moves with negative SEE values
if ( (!inCheck || evasionPrunable) && !pos.see_ge(move)) if ( !inCheck && !pos.see_ge(move))
continue; continue;
// Speculative prefetch as early as possible // Speculative prefetch as early as possible