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Simplify score improvement reduction

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Reduce depth by 2 based on score improvement, only for depths 3 to 11.

Simplification STC: https://tests.stockfishchess.org/tests/view/64929a53dc7002ce609c7807
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 238912 W: 63466 L: 63468 D: 111978
Ptnml(0-2): 564, 26262, 65805, 26262, 563

Simplification LTC: https://tests.stockfishchess.org/tests/view/64942e47dc7002ce609c9e07
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 64452 W: 17485 L: 17320 D: 29647
Ptnml(0-2): 19, 6161, 19706, 6316, 24

closes https://github.com/official-stockfish/Stockfish/pull/4637

Bench: 2740142
This commit is contained in:
Muzhen Gaming 2023-06-22 19:19:21 +08:00 • committed by Joost VandeVondele
parent eb9aaf9489
commit 5f8480a730
1 changed files with 4 additions and 4 deletions
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8
src/search.cpp
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@ -1323,12 +1323,12 @@ moves_loop: // When in check, search starts here
}
else
{
// Reduce other moves if we have found at least one score improvement (~1 Elo)
// Reduce more for depth > 3 and depth < 12 (~1 Elo)
if ( depth > 1
// Reduce other moves if we have found at least one score improvement (~2 Elo)
if ( depth > 2
&& depth < 12
&& beta < 14362
&& value > -12393)
depth -= depth > 3 && depth < 12 ? 2 : 1;
depth -= 2;
assert(depth > 0);
alpha = value; // Update alpha! Always alpha < beta