Prune moves with negative History
and CMH scores at low depth.
STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 24182 W: 4672 L: 4439 D: 15071
LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 12579 W: 1959 L: 1792 D: 8828
bench:
8907701
&& moveCount >= FutilityMoveCounts[improving][depth])
continue;
+ // History Score Pruning
+ if ( depth <= 3 * ONE_PLY
+ && thisThread->History[pos.moved_piece(move)][to_sq(move)] < VALUE_ZERO
+ && CounterMovesHistory[pos.piece_on(prevMoveSq)][prevMoveSq]
+ [pos.moved_piece(move)][to_sq(move)] < VALUE_ZERO)
+ continue;
+
predictedDepth = newDepth - reduction<PvNode>(improving, depth, moveCount);
// Futility pruning: parent node