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Decrease reduction for exact PV nodes

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STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 59004 W: 10621 L: 10249 D: 38134

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 25801 W: 3306 L: 3108 D: 19387

Bench: 5742466
This commit is contained in:
VoyagerOne 2017-09-30 10:16:28 -04:00 • committed by Marco Costalba
parent c33af32dad
commit 07b5a28a68
1 changed files with 6 additions and 1 deletions
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7
src/search.cpp
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@ -543,7 +543,7 @@ namespace {
Depth extension, newDepth; Depth extension, newDepth;
Value bestValue, value, ttValue, eval; Value bestValue, value, ttValue, eval;
bool ttHit, inCheck, givesCheck, singularExtensionNode, improving; bool ttHit, inCheck, givesCheck, singularExtensionNode, improving;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning, skipQuiets, ttCapture; bool captureOrPromotion, doFullDepthSearch, moveCountPruning, skipQuiets, ttCapture, pvExact;
Piece movedPiece; Piece movedPiece;
int moveCount, quietCount; int moveCount, quietCount;
@ -813,6 +813,7 @@ moves_loop: // When in check search starts from here
&& tte->depth() >= depth - 3 * ONE_PLY; && tte->depth() >= depth - 3 * ONE_PLY;
skipQuiets = false; skipQuiets = false;
ttCapture = false; ttCapture = false;
pvExact = PvNode && ttHit && tte->bound() == BOUND_EXACT;
// Step 11. Loop through moves // Step 11. Loop through moves
// Loop through all pseudo-legal moves until no moves remain or a beta cutoff occurs // Loop through all pseudo-legal moves until no moves remain or a beta cutoff occurs
@ -957,6 +958,10 @@ moves_loop: // When in check search starts from here
if ((ss-1)->moveCount > 15) if ((ss-1)->moveCount > 15)
r -= ONE_PLY; r -= ONE_PLY;
// Decrease reduction for exact PV nodes
if (pvExact)
r -= ONE_PLY;
// Increase reduction if ttMove is a capture // Increase reduction if ttMove is a capture
if (ttCapture) if (ttCapture)
r += ONE_PLY; r += ONE_PLY;