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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.


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ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN


Commit ID 30a905c95d0b77874244c8b68ae77daba41ac545
Author 31m059
Date 2018-11-11 21:14:28 UTC
Simplify tropism. (#1807) We calculate tropism as a sum of two factors. The first is the number of squares in our kingFlank and Camp that are attacked by the enemy; the second is number of these squares that are attacked twice. Prior to this commit, we excluded squares we defended with pawns from this second value, but this appears unnecessary. (Doubly-attacked squares near our king are still dangerous.) The removal of this exclusion is a possible small Elo gain at STC (estimated +1.59) and almost exactly neutral at LTC (estimated +0.04). STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 20942 W: 4550 L: 4427 D: 11965 LTC: LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 56941 W: 9172 L: 9108 D: 38661 Bench: 3813986
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