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Change extra ply LMR condition to: cmh <= 0 && hist < 0

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Extra ply LMR condition is now cmh <= 0 && h < 0
Instead of cmh + h < 0

STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 55210 W: 10812 L: 10557 D: 33841

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 13212 W: 2239 L: 2045 D: 8928

Bench: 8420865

Resolves #339
This commit is contained in:
VoyagerOne 2015-04-26 20:12:25 +01:00 • committed by Joona Kiiski
parent 078625e333
commit b7063ef65b
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -960,9 +960,8 @@ moves_loop: // When in check and at SpNode search starts from here
ss->reduction = reduction<PvNode>(improving, depth, moveCount);
if ( (!PvNode && cutNode)
|| ( History[pos.piece_on(to_sq(move))][to_sq(move)]
+ CounterMovesHistory[pos.piece_on(prevMoveSq)][prevMoveSq]
[pos.piece_on(to_sq(move))][to_sq(move)] < VALUE_ZERO))
|| ( 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 += ONE_PLY;
if (move == countermove)