Removed countermove condition for decreasing reduction.
LTC:
LLR: 3.01 (-2.94,2.94) [-3.00,1.00]
Total: 32410 W: 5092 L: 4986 D: 22332
STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 24450 W: 4632 L: 4517 D: 15301
Bench:
6943812
Resolves #378
[pos.piece_on(to_sq(move))][to_sq(move)] <= VALUE_ZERO))
ss->reduction += ONE_PLY;
- if ( move == countermove
- || ( History[pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO
+ if ( History[pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO
&& CounterMovesHistory[pos.piece_on(prevMoveSq)][prevMoveSq]
- [pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO))
+ [pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO)
ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
// Decrease reduction for moves that escape a capture