deepcrayon
/
stockfish
1
0
Fork 0
Code Releases Activity

Remove noLMRExtension flag 

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
pull/3743/head
Stéphane Nicolet 2021-10-17 13:06:33 +02:00
parent 6847be2c75
commit 8a74c08928
1 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/search.cpp
View File

@ -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