Dev Builds » 20210613-1000

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 e1f181ee643dcaa92c606b74b3abd23dede136cd
Author Vizvezdenec
Date 2021-06-13 10:00:20 UTC
Do less LMR extensions This patch restricts LMR extensions (of non-transposition table moves) from being used when the transposition table move was extended by two plies via singular extension. This may serve to limit search explosions in certain positions. This makes a lot of sense because the precondition for the tt-move to have been singular extended by two plies is that the result of the alternate search (with excluded the tt-move) has been a hard fail low: it is natural to later search less for non tt-moves in this situation. The current state of depth/extensions/reductions management is getting quite tricky in our search algo, see https://github.com/official-stockfish/Stockfish/pull/3546#issuecomment-860174549 for some discussion. Suggestions welcome! Passed STC https://tests.stockfishchess.org/tests/view/60c3f293457376eb8bcaac8d LLR: 2.95 (-2.94,2.94) <-0.50,2.50> Total: 117984 W: 9698 L: 9430 D: 98856 Ptnml(0-2): 315, 7708, 42703, 7926, 340 passed LTC https://tests.stockfishchess.org/tests/view/60c46ea5457376eb8bcaacc7 LLR: 2.97 (-2.94,2.94) <0.50,3.50> Total: 11280 W: 401 L: 302 D: 10577 Ptnml(0-2): 2, 271, 4998, 364, 5 closes https://github.com/official-stockfish/Stockfish/pull/3546 Bench: 4709974
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