official-stockfish/Stockfish — pull request #163 by locutus2 (2014-12-18 13:09:29+00:00)
Title: Big king safety tuning

ShelterWeakness and Stormdanger array are now indexed additionally by file pair (a/h,b/g,c/f,d/e).
The special case of king blocking a pawn is incorporated in the StormDanger array.
Finally the 93 parameters are tuned by SPSA on LTC.

STC
ELO: 3.46 +-2.2 (95%) LOS: 99.9%
Total: 40000 W: 8275 L: 7877 D: 23848

LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 10311 W: 1876 L: 1721 D: 6714

Bench: 9124225