Dev Builds » 20210130-1220

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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 1188141aa78d01c361582daaa73de5154b6d09b1
Author Stéphane Nicolet
Date 2021-01-30 12:20:56 UTC
Improve play for closed positions This patch give a small bonus to incite the attacking side to keep more pawns on the board. A consequence of this bonus is that Stockfish will tend to play positions slightly more closed on average than master, especially when it believes that it has an advantage. To lower the risk of blockades where Stockfish start shuffling without progress, we also implement a progressive decrease of the evaluation value with the 50 moves counter (along with the necessary aging of the transposition table to reduce the impact of the Graph History Interaction problem): since the evaluation decreases during shuffling phases, the engine will tend to examine the consequences of pawn breaks faster during the search. Passed STC: LLR: 2.96 (-2.94,2.94) {-0.25,1.25} Total: 26184 W: 2406 L: 2252 D: 21526 Ptnml(0-2): 85, 1784, 9223, 1892, 108 https://tests.stockfishchess.org/tests/view/600cc08b735dd7f0f0352c06 Passed LCT: LLR: 2.95 (-2.94,2.94) {0.25,1.25} Total: 199768 W: 7695 L: 7191 D: 184882 Ptnml(0-2): 85, 6478, 86269, 6952, 100 https://tests.stockfishchess.org/tests/view/600ccd28735dd7f0f0352c10 Closes https://github.com/official-stockfish/Stockfish/pull/3321 Bench: 3988915
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