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Refine futility pruning for parent nodes

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This patch is a result of refining of tuning vondele did after
new net passed and some hand-made values adjustements - excluding
changes in other pruning heuristics and rounding value of history
divisor to the nearest power of 2.

With this patch futility pruning becomes more aggressive and
history influence on it is doubled again.

passed STC
https://tests.stockfishchess.org/tests/view/61a2c4c1a26505c2278c150d
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 33848 W: 8841 L: 8574 D: 16433
Ptnml(0-2): 100, 3745, 8988, 3970, 121

passed LTC
https://tests.stockfishchess.org/tests/view/61a327ffa26505c2278c26d9
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 22272 W: 5856 L: 5614 D: 10802
Ptnml(0-2): 12, 2230, 6412, 2468, 14

closes https://github.com/official-stockfish/Stockfish/pull/3814

bench 6302543
This commit is contained in:
Michael Chaly 2021-11-28 15:19:18 +03:00 • committed by Joost VandeVondele
parent 8bb5a436b2
commit af050e5eed
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1068,7 +1068,7 @@ moves_loop: // When in check, search starts here
// Futility pruning: parent node (~5 Elo)
if ( !ss->inCheck
&& lmrDepth < 8
&& ss->staticEval + 172 + 145 * lmrDepth + history / 128 <= alpha)
&& ss->staticEval + 142 + 139 * lmrDepth + history / 64 <= alpha)
continue;
// Prune moves with negative SEE (~20 Elo)