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Revert "Reduce When TTValue is Above Alpha"

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The patch regressed significantly at longer time controls. In
particular, the `depth--` behavior was predicted to scale badly based on
data from other variations of the patch.

Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/view/664d45cf830eb9f886616c7d
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 51292 W: 13242 L: 12954 D: 25096
Ptnml(0-2): 5, 4724, 15896, 5020, 1

Passed VVLTC 2nd sprt:
https://tests.stockfishchess.org/tests/view/664e641a928b1fb18de4e385
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 41884 W: 10933 L: 10634 D: 20317
Ptnml(0-2): 1, 3759, 13125, 4054, 3

closes https://github.com/official-stockfish/Stockfish/pull/5283

Bench: 1503815
This commit is contained in:
Muzhen Gaming 2024-05-22 09:09:04 +08:00 • committed by Disservin
parent c6a1e7fd42
commit 72a345873d
1 changed files with 1 additions and 4 deletions
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5
src/search.cpp
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@ -833,12 +833,9 @@ Value Search::Worker::search(
if (PvNode && !ttMove)
depth -= 3;
if (!PvNode && ss->ttHit && (tte->bound() & BOUND_UPPER) && ttValue > alpha + 5 * depth)
depth--;
// Use qsearch if depth <= 0.
if (depth <= 0)
return qsearch < PvNode ? PV : NonPV > (pos, ss, alpha, beta);
return qsearch<PV>(pos, ss, alpha, beta);
// For cutNodes, if depth is high enough, decrease depth by 2 if there is no ttMove, or
// by 1 if there is a ttMove with an upper bound.