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Remove noLMRExtension flag

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This simplification patch removes the noLMRExtension flag. It was introduced in June
(see following link for that commit), but does not seem to be necessary anymore.
Link: e1f181ee64

STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 21200 W: 5369 L: 5228 D: 10603
Ptnml(0-2): 67, 2355, 5616, 2494, 68
https://tests.stockfishchess.org/tests/view/616c03d299b580bf37797dcb

LTC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 37536 W: 9387 L: 9278 D: 18871
Ptnml(0-2): 23, 3988, 10643, 4085, 29
https://tests.stockfishchess.org/tests/view/616c10f499b580bf37797ddd

closes https://github.com/official-stockfish/Stockfish/pull/3743

Bench: 4792969
This commit is contained in:
Stéphane Nicolet 2021-10-17 13:06:33 +02:00
parent 6847be2c75
commit 8a74c08928
1 changed files with 2 additions and 6 deletions
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8
src/search.cpp
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@ -588,7 +588,7 @@ namespace {
Value bestValue, value, ttValue, eval, maxValue, probCutBeta;
bool givesCheck, improving, didLMR, priorCapture;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning,
ttCapture, singularQuietLMR, noLMRExtension;
ttCapture, singularQuietLMR;
Piece movedPiece;
int moveCount, captureCount, quietCount, bestMoveCount, improvement;
@ -984,7 +984,7 @@ moves_loop: // When in check, search starts here
ss->ply);
value = bestValue;
singularQuietLMR = moveCountPruning = noLMRExtension = false;
singularQuietLMR = moveCountPruning = false;
// Indicate PvNodes that will probably fail low if the node was searched
// at a depth equal or greater than the current depth, and the result of this search was a fail low.
@ -1108,10 +1108,7 @@ moves_loop: // When in check, search starts here
if ( !PvNode
&& value < singularBeta - 75
&& ss->doubleExtensions <= 6)
{
extension = 2;
noLMRExtension = true;
}
}
// Multi-cut pruning
@ -1221,7 +1218,6 @@ moves_loop: // When in check, search starts here
// are really negative and movecount is low, we allow this move to be searched
// deeper than the first move (this may lead to hidden double extensions).
int deeper = r >= -1 ? 0
: noLMRExtension ? 0
: moveCount <= 3 && r <= -3 ? 2
: moveCount <= 5 ? 1
: PvNode && depth > 6 ? 1