Dev Builds » 20190701-1207

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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.


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 ca51d1ee63f376e0eb6efb6f3d5d901e4b2a5bb0
Author Joost VandeVondele
Date 2019-07-01 12:07:54 UTC
Smoothly change playing strength with skill level. (#2142) The current skill levels (1-20) allow for adjusting playing strengths, but do so in big steps (e.g. level 10 vs level 11 is a ~143 Elo jump at STC). Since the 'Skill Level' input can already be a floating point number, this patch uses the fractional part of the input to provide the user with fine control, allowing for varying the playing strength essentially continuously. The implementation internally still uses integer skill levels (needed since they pick Depths), but non-deterministically rounds up or down the used skill level such that the average integer skill corresponds to the input floating point one. As expected, intermediate (fractional) skill levels yield intermediate playing strenghts. Tested at STC, playing level 10 against levels between 10 and 11 for 10000 games level 10.25 ELO: 24.26 +-6.2 level 10.5 ELO: 67.51 +-6.3 level 10.75 ELO: 98.52 +-6.4 level 11 ELO: 143.65 +-6.7 No functional change.
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