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Merged
merged 5 commits into from
Oct 9, 2024
Merged

🔍 Save static eval in TT #1085

merged 5 commits into from
Oct 9, 2024

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@eduherminio eduherminio commented Oct 8, 2024 •
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We save the static evaluation as part of TranspositionTableElement (+2 bytes, 8 -> 10) in exchange for some measurable speedup as a result of not having to calculate static eval for TT hits
image

This specific PR has Use raw static eval even when TT score is reused over #1084: even if TT scores are used for search, the real/raw static eval is the one saved in the TT, with still the exception of final evals, that are treated as the static evals of a position that we want to re-use later.

Regular testing conditions:

Test  | search/tt-save-staticeval-2
Elo   | 7.79 +- 4.29 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | 2.91 (-2.25, 2.89) [0.00, 3.00]
Games | 11904: +3472 -3205 =5227
Penta | [323, 1357, 2356, 1562, 354]
https://openbench.lynx-chess.com/test/820/

Test  | search/tt-save-staticeval-2
Elo   | 4.89 +- 3.13 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=128MB
LLR   | 2.90 (-2.25, 2.89) [0.00, 3.00]
Games | 18458: +4909 -4649 =8900
Penta | [312, 2180, 4033, 2344, 360]
https://openbench.lynx-chess.com/test/827/

Small TT:

Test  | search/tt-save-staticeval-2
Elo   | 0.67 +- 3.30 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=4MB
LLR   | 2.90 (-2.25, 2.89) [-5.00, 0.00]
Games | 20122: +5674 -5635 =8813
Penta | [570, 2421, 4086, 2368, 616]
https://openbench.lynx-chess.com/test/828/

Test  | search/tt-save-staticeval-2
Elo   | 4.53 +- 5.05 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=32MB
LLR   | 2.91 (-2.25, 2.89) [-5.00, 0.00]
Games | 7290: +1922 -1827 =3541
Penta | [135, 858, 1582, 917, 153]
https://openbench.lynx-chess.com/test/829/

@eduherminio eduherminio mentioned this pull request Oct 8, 2024
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@eduherminio eduherminio mentioned this pull request Oct 9, 2024
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@eduherminio eduherminio changed the title 🔍 Save static eval in TT (II) 🔍 Save static eval in TT Oct 9, 2024
@eduherminio eduherminio marked this pull request as ready for review October 9, 2024 12:33
@eduherminio eduherminio enabled auto-merge (squash) October 9, 2024 12:35
@eduherminio eduherminio disabled auto-merge October 9, 2024 12:37
@eduherminio eduherminio enabled auto-merge (squash) October 9, 2024 12:39
@eduherminio eduherminio merged commit 956d879 into main Oct 9, 2024
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@eduherminio eduherminio deleted the search/tt-save-staticeval-2 branch October 9, 2024 12:39
@eduherminio eduherminio mentioned this pull request Oct 9, 2024
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