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Use FMHs to assist with LMR formula.

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STC:
LLR: 2.99 (-2.94,2.94) [0.00,5.00]
Total: 52232 W: 9654 L: 9304 D: 33274

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 115988 W: 15550 L: 15049 D: 85389

Bench: 7890808

Resolves #651
This commit is contained in:
VoyagerOne 2016-04-17 20:04:34 -04:00 • committed by Joona Kiiski
parent 4048bae47b
commit e082112cfe
1 changed files with 6 additions and 1 deletions
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7
src/search.cpp
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@ -1006,6 +1006,11 @@ moves_loop: // When in check search starts from here
Depth r = reduction<PvNode>(improving, depth, moveCount);
Value hValue = thisThread->history[pos.piece_on(to_sq(move))][to_sq(move)];
Value cmhValue = cmh[pos.piece_on(to_sq(move))][to_sq(move)];
const CounterMoveStats* fm = (ss - 2)->counterMoves;
const CounterMoveStats* fm2 = (ss - 4)->counterMoves;
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);
// Increase reduction for cut nodes and moves with a bad history
if ( (!PvNode && cutNode)
@ -1013,7 +1018,7 @@ moves_loop: // When in check search starts from here
r += ONE_PLY;
// Decrease/increase reduction for moves with a good/bad history
int rHist = (hValue + cmhValue) / 14980;
int rHist = (hValue + cmhValue + fmValue + fm2Value) / 20000;
r = std::max(DEPTH_ZERO, r - rHist * ONE_PLY);
// Decrease reduction for moves that escape a capture. Filter out