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This is a functional simplification which fixes an awkward numerical cliff.
With master king_safety, no pawns is scored higher than pawn(s) that is/are far from the king. This may motivate SF to throw away pawns to increase king safety. With this patch, there is a consistent value for minPawnDistance where losing a pawn never increases king safety.
STC
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 45548 W: 8624 L: 8525 D: 28399
Ptnml(0-2): 592, 4937, 11587, 5096, 562
https://tests.stockfishchess.org/tests/view/5e98ced630be947a14e9ddc5
LTC
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 42084 W: 5292 L: 5242 D: 31550
Ptnml(0-2): 193, 3703, 13252, 3649, 245
https://tests.stockfishchess.org/tests/view/5e98e22e30be947a14e9de07
bench 4600292