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Remove the distinction between the king file and the two neighbours files in the ShelterStrength[] array. Instead we initialize the safety variable in the evaluate_shelter() function with a -10 penalty if our king is on a semi-open file (ie. if our king is on a file without a pawn protection). Also rename shelter_storm() to evaluate_shelter() while there. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 23153 W: 4795 L: 4677 D: 13681 http://tests.stockfishchess.org/tests/view/5adcb83d0ebc595ec7ff8aa7 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 25728 W: 3934 L: 3821 D: 17973 http://tests.stockfishchess.org/tests/view/5adcdcb60ebc595ec7ff8adb See the commit history in PR#1559 for the proof that the committed version is equivalent to the version in the tests above: https://github.com/official-stockfish/Stockfish/pull/1559 Full credit to @protonspring for the renormalized values of the ShelterStrength[] array used for the simplification. Thanks! Bench: 4703935