stoppers = theirPawns & passed_pawn_mask(Us, s);
lever = theirPawns & pawnAttacksBB[s];
leverPush = theirPawns & pawnAttacksBB[s + Up];
stoppers = theirPawns & passed_pawn_mask(Us, s);
lever = theirPawns & pawnAttacksBB[s];
leverPush = theirPawns & pawnAttacksBB[s + Up];