Dev Builds » 20260904-1042

You are viewing an old NCM Stockfish dev build test. You may find the most recent dev build tests using Stockfish 15 as the baseline here.

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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	6e4c77f51d09062180fbc2b9befd294abe412633
Author	Robert Nurnberg @ elitebook
Date	2026-09-04 10:42:02 UTC
Fix bug in nodestime When `availableNodes` hits 0 in master, on the next move we hit UB in `TimeManagement::init()`. More generally, the UB can happen whenever `availableNodes < npmsec`. That is because `limits.time[us] == 0` gets passed into `scaledTime`, which is then used in `log10` to define `logTimeInSec`, leading to `-inf` in `optConstant` and hence `+inf` in `optScale`, if `originalTimeAdjust < 0`. Casting that `+inf` double value to the integer valued `optimumTime` via `TimePoint(std::max(1.0, optScale * timeLeft))` is undefined behavior. The patch clamps `scaledTime` from below to 1. closes https://github.com/official-stockfish/Stockfish/pull/7129 No functional change