Simplification: remove pawn shelter/storm masks
Encode the pawn shelter/storm masks into the danger score
This highly specialized rule directly contradicts the VERY high
danger score for blocked pawns. Reducing the danger score for
blocked pawns and removing this rule is apparently an effective
compromise.
STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 36597 W: 7522 L: 7429 D: 21646
http://tests.stockfishchess.org/tests/view/5ab935f30ebc5902932cc016
LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 100690 W: 15373 L: 15372 D: 69945
http://tests.stockfishchess.org/tests/view/5ab9501f0ebc5902932cc042
Closes https://github.com/official-stockfish/Stockfish/pull/1514
Bench: 5980822