Dev Builds » 20130426-1014

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 e508494a9985a5d54e77df694e8f160bb3346de3
Author Marco Costalba
Date 2013-04-26 10:14:01 UTC
Fix a crash introduced few days ago Crash is due to uninitialized ss->futilityMoveCount that when happens to be negative, yields to an out of range access in futility_margin(). Bug is subtle because it shows itself only in SMP case. Indeed in single thread mode we only use the Stack ss[MAX_PLY_PLUS_2]; Allocated at the begin of id_loop() and due to pure (bad) luck, it happens that for all the MAX_PLY_PLUS_2 elements, ss[i].futilityMoveCount >= 0 Note that the patch does not prevent futilityMoveCount to be overwritten after, for instance singular search or null verification, but to keep things readable and because the effect is almost unmeasurable, we here prefer a slightly incorrect but simpler patch. bench: 4311634
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