Dev Builds » 20190221-1853

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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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Commit ID badb2aca44d6507f35dafc8b5c3921a6649a40f8
Author Kurtbusch
Date 2019-02-21 18:53:03 UTC
Add KNNvKP Endgame Heuristic This is a somewhat different patch. It fixes blindspots for two knights vs pawn endgame. With local testing starting from random KNNvKP positions where the pawn has not advanced beyond the 4th rank (thanks @protonspring !) at 15+0.15 (4 cores), this went +105=868-27 against master. All except two losses were won in reverse. The heuristic is simple but effective - the strategy in these endgames is to push the opposing king to the corner, then move the knight that's blocking the pawn in for the checkmate while the pawn is free to move and prevents stalemate. This patch gives SF the little boost it needs to search the relevant king-cornering mating lines. See the discussion in pull request 1939 for some more good results for this test in independant tests: Bench: 3310239
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