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More accurate pawn attack span definition
Tweak the pawn attack span for backward pawns and the zone behind opponent opposing pawns. This is important in positional play and one of weaknesses of the engine in recent high level games. STC LLR: -2.95 (-2.94,2.94) [0.50,4.50] Total: 66843 W: 14884 L: 14717 D: 37242 http://tests.stockfishchess.org/tests/view/5d8dcb1b0ebc590f3beb2956 LTC LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 77699 W: 12993 L: 12602 D: 52104 http://tests.stockfishchess.org/tests/view/5d8de9bc0ebc590f3beb3d00 See discussion in #2332 Bench: 4012371
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