Dev Builds » 20180314-2101

Use this dev build

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.


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 ID 8db75dd9ec05410136898aa2f8c6dc720b755eb8
Author Stéphane Nicolet
Date 2018-03-14 21:01:58 UTC
Check the clock every 1024 nodes This patch checks the clock every 1024, instead of 4096 in current master. This is a step towards a solution to alleviate the problem reported by Gian-Carlo Pascutto in pull request #1471, about a situation where SF would sometimes lose on time in endgames at time control 1min+1sec when using Syzygy EGTB on a spinning drive. We made four tests called "Estimate the Elo cost of calling now() every N nodes", with N in {256,1024} and time control in {STC,LTC}. Each test was 40000 games with auto-purge off, against master branch. Here is a summary of the results (speed-up and Elo gain against master): | Time | N=256 | N=1024 | |:--------:|:-----------------:|:----------------:| | Speed-up | 0.1% slower | 0.2% faster | | STC | -0.33 +-2.2 Elo | 1.33 +-2.2 Elo | | LTC | 1.08 +-2.3 Elo | 2.34 +-2.2 Elo | Based on these results, we tested N=1024 as a non-regression against master at LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 80746 W: 12430 L: 12399 D: 55917 Closes No functional change.
Copyright 2011–2024 Next Chess Move LLC