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Introduce Secondary TT Aging

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When a high-depth TT entry fail to produce a cutoff, decrease the stored depth
by 1. This is intended to help cases such as #5023
(https://github.com/official-stockfish/Stockfish/issues/5023#issuecomment-2814209391),
where entries with extremely high depths prevent TT cutoffs, contributing to
search explosions.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 128800 W: 33502 L: 33053 D: 62245
Ptnml(0-2): 331, 15084, 33149, 15477, 359
https://tests.stockfishchess.org/tests/view/683958e56ec7634154f9d2a9

Passed LTC:
LLR: 2.97 (-2.94,2.94) <0.50,2.50>
Total: 63288 W: 16376 L: 16005 D: 30907
Ptnml(0-2): 26, 6712, 17798, 7081, 27
https://tests.stockfishchess.org/tests/view/683aa4026ec7634154f9d469

closes https://github.com/official-stockfish/Stockfish/pull/6113

Bench: 2144705
This commit is contained in:
Shawn Xu
2025-05-30 00:03:23 -07:00
committed by Joost VandeVondele
parent 3747a19937
commit c9af7674bc
1 changed files with 2 additions and 0 deletions
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2
src/tt.cpp
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@@ -110,6 +110,8 @@ void TTEntry::save(
value16 = int16_t(v);
eval16 = int16_t(ev);
}
else if (depth8 + DEPTH_ENTRY_OFFSET >= 5 && Bound(genBound8 & 0x3) != BOUND_EXACT)
depth8--;
}