Dev Builds » 20200927-0624

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 1dbd2a1ad548b3ca676f7da949e1a998c64b836b
Author Stéphane Nicolet
Date 2020-09-27 06:24:50 UTC
Tweak nnue scaling to keep more material Current master uses a constant scale factor of 5/4 = 1.25 for the output of the NNUE network, for compatibility with search and classical evaluation. We modify this scale factor to make it dependent on the phase of the game, going from about 1.5 in the opening to 1.0 for pure pawn endgames. This helps Stockfish to avoid exchanges of pieces (heavy pieces in particular) when she has the advantage, keeping more material on the board when attacking. Passed STC: LLR: 2.95 (-2.94,2.94) {-0.25,1.25} Total: 14744 W: 1771 L: 1599 D: 11374 Ptnml(0-2): 87, 1184, 4664, 1344, 93 https://tests.stockfishchess.org/tests/view/5f6fb0a63b22d6afa506904f Passed LTC: LLR: 2.95 (-2.94,2.94) {0.25,1.25} Total: 8912 W: 512 L: 393 D: 8007 Ptnml(0-2): 7, 344, 3637, 459, 9 https://tests.stockfishchess.org/tests/view/5f6fcf533b22d6afa5069066 closes https://github.com/official-stockfish/Stockfish/pull/3154 Bench: 3943952
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