Dev Builds » 20191001-2343

Use this dev build

NCM plays each Stockfish dev build 20,000 times against Stockfish 15. 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 005ad170c1dccdcd4ce73074302828ea22628b70
Author Joost VandeVondele
Date 2019-10-01 23:43:02 UTC
Adjust reductions based on the number of threads In lazySMP it makes sense to prune a little more, as multiple threads search wider. We thus increase the prefactor of the reductions slowly as a function of the threads. The prefactor of the log(threads) term is a parameter, this pull request uses 1/2 after testing. passed STC @ 8threads: LLR: 2.96 (-2.94,2.94) [0.50,4.50] Total: 118125 W: 23151 L: 22462 D: 72512 http://tests.stockfishchess.org/tests/view/5d8bbf4d0ebc59509180f217 passed LTC @ 8threads: LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 67546 W: 10630 L: 10279 D: 46637 http://tests.stockfishchess.org/tests/view/5d8c463b0ebc5950918167e8 passed ~LTC @ 14threads: LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 74271 W: 12421 L: 12040 D: 49810 http://tests.stockfishchess.org/tests/view/5d8db1f50ebc590f3beb24ef Note: A larger prefactor (1) passed similar tests at STC and LTC (8 threads), while a very large one (2) passed STC quickly but failed LTC (8 threads). For the single-threaded case there is no functional change. Closes https://github.com/official-stockfish/Stockfish/pull/2337 Bench: 4088701 Fixup: remove redundant code.
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