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Simplify Away TT Cutoff Return Value Adjustments

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Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 198432 W: 51161 L: 51119 D: 96152
Ptnml(0-2): 772, 23670, 50273, 23746, 755
https://tests.stockfishchess.org/tests/view/66517b9ea86388d5e27da966

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 234150 W: 59200 L: 59197 D: 115753
Ptnml(0-2): 126, 26200, 64404, 26235, 110
https://tests.stockfishchess.org/tests/view/6653a84da86388d5e27daa63

closes https://github.com/official-stockfish/Stockfish/pull/5292

bench 1555200
This commit is contained in:
Shawn Xu 2024-05-24 22:46:03 -07:00 • committed by Joost VandeVondele
parent 8e1f273c7d
commit 5e98a4e43d
1 changed files with 1 additions and 3 deletions
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4
src/search.cpp
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@ -637,9 +637,7 @@ Value Search::Worker::search(
// Partial workaround for the graph history interaction problem
// For high rule50 counts don't produce transposition table cutoffs.
if (pos.rule50_count() < 90)
return ttValue >= beta && std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY
? (ttValue * 3 + beta) / 4
: ttValue;
return ttValue;
}
// Step 5. Tablebases probe