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Remove reduction for moving threatened piece

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Simplify away "Decrease reduction if we move a threatened piece".

Running a dbg_hit_on() shows that this line is only called ~0.12% of the time.

Simplification STC: https://tests.stockfishchess.org/tests/view/641ec2dcdb43ab2ba6f88103
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 146128 W: 39168 L: 39070 D: 67890
Ptnml(0-2): 466, 16117, 39830, 16155, 496

Simplification LTC: https://tests.stockfishchess.org/tests/view/64200689db43ab2ba6f8bca8
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 248016 W: 66703 L: 66714 D: 114599
Ptnml(0-2): 105, 24202, 75406, 24189, 106

closes https://github.com/official-stockfish/Stockfish/pull/4471

Bench: 4961236
This commit is contained in:
Muzhen Gaming 2023-03-30 17:46:15 +08:00 • committed by Joost VandeVondele
parent e8742bdab3
commit c3c46feebb
1 changed files with 0 additions and 5 deletions
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5
src/search.cpp
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@ -1181,11 +1181,6 @@ moves_loop: // When in check, search starts here
if (singularQuietLMR)
r--;
// Decrease reduction if we move a threatened piece (~1 Elo)
if ( depth > 9
&& (mp.threatenedPieces & from_sq(move)))
r--;
// Increase reduction if next ply has a lot of fail high (~5 Elo)
if ((ss+1)->cutoffCnt > 3)
r++;