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Revert "Reduce more when improving and ttvalue is lower than alpha"

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The patch regressed significantly at longer time controls.

Passed VLTC:
https://tests.stockfishchess.org/tests/view/6644c7a2bc537f5619453096
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 43336 W: 11177 L: 10884 D: 21275
Ptnml(0-2): 3, 4432, 12507, 4721, 5

Passed VVLTC:
https://tests.stockfishchess.org/tests/view/66450c974aa4fa9a83b6d0b0
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 32394 W: 8350 L: 8072 D: 15972
Ptnml(0-2): 2, 2798, 10317, 3080, 0

closes https://github.com/official-stockfish/Stockfish/pull/5251

Bench: 1594188
This commit is contained in:
Muzhen Gaming 2024-05-15 22:32:55 +08:00 • committed by Disservin
parent 541406ab91
commit e3c9ed77aa
1 changed files with 0 additions and 3 deletions
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3
src/search.cpp
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@ -1134,9 +1134,6 @@ moves_loop: // When in check, search starts here
if (PvNode)
r--;
if (improving && ttValue <= alpha && move != ttMove)
r++;
// Increase reduction if next ply has a lot of fail high (~5 Elo)
if ((ss + 1)->cutoffCnt > 3)
r++;