Dev Builds » 20250928-1904

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NCM plays each Stockfish dev build 20,000 times against Stockfish 14. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.

Summary

Host Duration Avg Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN

Commit

Commit ID 9b164d952061213da4fc0f7ac8646e44e8a77cd5
Author Timothy Herchen
Date 2025-09-28 19:04:29 UTC
Shave some instructions off a hot loop in affine transform On x86, GCC generates highly suboptimal code for this loop in its old form, about 2x as many instructions as necessary. This decreases throughput especially in an SMT setting. Clang does a better job but this change still has some improvement. Note that the std::ptrdiff_t type is not optional; using an unsigned type brings back the bad assembly. (Not sure why, but it seems reliable on all the GCC versions I tested.) passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 44672 W: 11841 L: 11527 D: 21304 Ptnml(0-2): 165, 4625, 12415, 4993, 138 https://tests.stockfishchess.org/tests/view/68d8111efa806e2e8393b10e closes https://github.com/official-stockfish/Stockfish/pull/6331 No functional change
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