Stockfish - UCI chess engine, interesting compiled byAlain SAVARD
King proximity tweak for passed pawns
Decrease slightly the penalty for opponent king distance to passed pawn. Instead of 5:2 ratio (or 20:8) we now have 19:8
STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 28638 W: 6297 L: 6104 D: 16237 Elo +2.34
LTC
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 59586 W: 9766 L: 9429 D: 40391 Elo +1.97
Where to go from here:
Further tests will try a similar tweak on the friendly king proximity penalty, because recent experiments indicate that this penalty is quite sensitive, but I wanted to try first on the larger term.
Rating JCER=3257
Stockfish 19120119 - download
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