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Remove one reduction call

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even though bench is unchanged to depth 28,
due to adjusting depth in singular extensions this might be functional.

STC: https://tests.stockfishchess.org/tests/view/63ec21affe833123fef34153
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 195712 W: 51625 L: 51581 D: 92506
Ptnml(0-2): 504, 20527, 55779, 20513, 533

LTC: https://tests.stockfishchess.org/tests/view/63ed3487fe833123fef375ed
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 32176 W: 8631 L: 8442 D: 15103
Ptnml(0-2): 5, 2794, 10309, 2967, 13

closes https://github.com/official-stockfish/Stockfish/pull/4395

Bench 4283297
This commit is contained in:
Dubslow
2023-02-14 18:04:17 -06:00
committed by Joost VandeVondele
parent 085cace457
commit 037ef3e18d
1 changed files with 3 additions and 3 deletions
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src/search.cpp
+3 -3
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@@ -987,6 +987,8 @@ moves_loop: // When in check, search starts here
Value delta = beta - alpha; Value delta = beta - alpha;
Depth r = reduction(improving, depth, moveCount, delta, thisThread->rootDelta);
// Step 14. Pruning at shallow depth (~120 Elo). Depth conditions are important for mate finding. // Step 14. Pruning at shallow depth (~120 Elo). Depth conditions are important for mate finding.
if ( !rootNode if ( !rootNode
&& pos.non_pawn_material(us) && pos.non_pawn_material(us)
@@ -996,7 +998,7 @@ moves_loop: // When in check, search starts here
moveCountPruning = moveCount >= futility_move_count(improving, depth); moveCountPruning = moveCount >= futility_move_count(improving, depth);
// Reduced depth of the next LMR search // Reduced depth of the next LMR search
int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount, delta, thisThread->rootDelta), 0); int lmrDepth = std::max(newDepth - r, 0);
if ( capture if ( capture
|| givesCheck) || givesCheck)
@@ -1133,8 +1135,6 @@ moves_loop: // When in check, search starts here
// Step 16. Make the move // Step 16. Make the move
pos.do_move(move, st, givesCheck); pos.do_move(move, st, givesCheck);
Depth r = reduction(improving, depth, moveCount, delta, thisThread->rootDelta);
// Decrease reduction if position is or has been on the PV // Decrease reduction if position is or has been on the PV
// and node is not likely to fail low. (~3 Elo) // and node is not likely to fail low. (~3 Elo)
if ( ss->ttPv if ( ss->ttPv