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Adjust pruning constants

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This patch is a modification of original tuning done by vondele that failed yellow.
Value differences are divided by 2.

Passed STC
https://tests.stockfishchess.org/tests/view/61d918239fea7913d9c64cdf
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 98968 W: 26248 L: 25858 D: 46862
Ptnml(0-2): 392, 11085, 26156, 11443, 408

Passed LTC
https://tests.stockfishchess.org/tests/view/61d99e3c9fea7913d9c663e4
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 215232 W: 58191 L: 57492 D: 99549
Ptnml(0-2): 271, 22124, 62138, 22801, 282

closes https://github.com/official-stockfish/Stockfish/pull/3885

bench 4572746
This commit is contained in:
Michael Chaly 2022-01-10 21:29:25 +03:00 • committed by Joost VandeVondele
parent c5a280c012
commit 44b1ba89a9
1 changed files with 3 additions and 3 deletions
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6
src/search.cpp
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@ -1040,7 +1040,7 @@ moves_loop: // When in check, search starts here
continue;
// SEE based pruning (~9 Elo)
if (!pos.see_ge(move, Value(-218) * depth))
if (!pos.see_ge(move, Value(-217) * depth))
continue;
}
else
@ -1051,7 +1051,7 @@ moves_loop: // When in check, search starts here
// Continuation history based pruning (~2 Elo)
if ( lmrDepth < 5
&& history < -3000 * depth + 3000)
&& history < -3875 * (depth - 1))
continue;
history += thisThread->mainHistory[us][from_to(move)];
@ -1059,7 +1059,7 @@ moves_loop: // When in check, search starts here
// Futility pruning: parent node (~9 Elo)
if ( !ss->inCheck
&& lmrDepth < 8
&& ss->staticEval + 142 + 139 * lmrDepth + history / 64 <= alpha)
&& ss->staticEval + 138 + 137 * lmrDepth + history / 64 <= alpha)
continue;
// Prune moves with negative SEE (~3 Elo)