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Remove lmrDepth restriction on quiet see pruning

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And tweak the threshold value. With this threshold and the current piece
values, this permits see pruning on quiets to be done up to an lmrDepth
of 9 (beyond that the threshold is below -QueenValueMg and see_ge will
pass unconditionally).

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 110316 W: 24612 L: 24667 D: 61037
http://tests.stockfishchess.org/tests/view/5b20aa760ebc5902ab9c9c1d

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 17352 W: 2968 L: 2842 D: 11542
http://tests.stockfishchess.org/tests/view/5b20cf1e0ebc5902ab9c9fb6

Closes https://github.com/official-stockfish/Stockfish/pull/1651

Bench: 5069074
This commit is contained in:
DU-jdto 2018-06-13 15:22:52 +10:00 • committed by Stéphane Nicolet
parent 6c36e65193
commit a834bfe833
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -947,8 +947,7 @@ moves_loop: // When in check, search starts from here
continue;
// Prune moves with negative SEE (~10 Elo)
if ( lmrDepth < 8
&& !pos.see_ge(move, Value(-35 * lmrDepth * lmrDepth)))
if (!pos.see_ge(move, Value(-29 * lmrDepth * lmrDepth)))
continue;
}
else if ( !extension // (~20 Elo)