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LMR Simplification: Remove countermove condition

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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
This commit is contained in:
VoyagerOne 2015-07-13 18:19:09 -04:00 • committed by Joona Kiiski
parent d8aeaab79c
commit 1d977aa79e
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -958,10 +958,9 @@ moves_loop: // When in check and at SpNode search starts from here
[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