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LMR Tweak: Decrease reduction if cmh>0 && history>0.

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STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 9627 W: 1879 L: 1748 D: 6000

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 21543 W: 3433 L: 3234 D: 14876

Bench: 8646407

Resolves #370 #371
This commit is contained in:
VoyagerOne 2015-06-27 09:41:17 +01:00 • committed by Joona Kiiski
parent 3f1bc9e013
commit 7e9f776fca
1 changed files with 4 additions and 1 deletions
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5
src/search.cpp
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@ -959,7 +959,10 @@ 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)
if ( move == countermove
|| ( 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))
ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
// Decrease reduction for moves that escape a capture