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Simplify History LMR Formula

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STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 41713 W: 7589 L: 7504 D: 26620

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 41353 W: 5484 L: 5391 D: 30478

Bench: 8946983
This commit is contained in:
VoyagerOne 2016-04-30 23:23:15 -04:00 • committed by Marco Costalba
parent 3487eb9f9e
commit 5486911e01
1 changed files with 3 additions and 4 deletions
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7
src/search.cpp
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@ -1013,13 +1013,12 @@ moves_loop: // When in check search starts from here
Value fmValue = (fm ? (*fm)[pos.piece_on(to_sq(move))][to_sq(move)] : VALUE_ZERO); Value fmValue = (fm ? (*fm)[pos.piece_on(to_sq(move))][to_sq(move)] : VALUE_ZERO);
Value fm2Value = (fm2 ? (*fm2)[pos.piece_on(to_sq(move))][to_sq(move)] : VALUE_ZERO); Value fm2Value = (fm2 ? (*fm2)[pos.piece_on(to_sq(move))][to_sq(move)] : VALUE_ZERO);
// Increase reduction for cut nodes and moves with a bad history // Increase reduction for cut nodes
if ( (!PvNode && cutNode) if (!PvNode && cutNode)
|| (hValue < VALUE_ZERO && cmhValue <= VALUE_ZERO))
r += ONE_PLY; r += ONE_PLY;
// Decrease/increase reduction for moves with a good/bad history // Decrease/increase reduction for moves with a good/bad history
int rHist = (hValue + cmhValue + fmValue + fm2Value) / 20000; int rHist = (hValue + cmhValue + fmValue + fm2Value - 10000) / 20000;
r = std::max(DEPTH_ZERO, r - rHist * ONE_PLY); r = std::max(DEPTH_ZERO, r - rHist * ONE_PLY);
// Decrease reduction for moves that escape a capture. Filter out // Decrease reduction for moves that escape a capture. Filter out