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Chess engine: Stockfish 21041512

on

Stockfish - UCI chess engine, compiled by Dsmsgms
Rating JCER=3157

Timestamp: 1618483539
Use classical eval for Bishop vs Pawns

NNUE evaluation is incapable of recognizing trivially drawn bishop endgames (the wrong-colored rook pawn), which are in fact ubiquitous and stock standard in chess analysis. Switching off NNUE evaluation in KBPs vs KPs endgames is a measure that stops Stockfish from trading down to a drawn version of these endings when we presumably have advantage. The patch is able to edge over master in endgame positions.

Patch tested for Elo gain with the "endgame.epd" book, and verified for non-regression with our usual book (see the pull request for details).

STC:
LLR: 2.93 (-2.94,2.94) {-0.20,1.10}
Total: 33232 W: 6655 L: 6497 D: 20080 Elo +1.65
Ptnml(0-2): 4, 2342, 11769, 2494, 7
https://tests.stockfishchess.org/tests/view/6074a52981417533789605b8

LTC:
LLR: 2.93 (-2.94,2.94) {0.20,0.90}
Total: 159056 W: 29799 L: 29378 D: 99879 Elo +0.92
Ptnml(0-2): 7, 9004, 61085, 9425, 7
https://tests.stockfishchess.org/tests/view/6074c39a81417533789605ca
Bench: 4503918

Stockfish 21041512 and NNUE download

 

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