score += RookOnPawn * popcount(pos.pieces(Them, PAWN) & PseudoAttacks[ROOK][s]);
// Bonus for rook on an open or semi-open file
- if (pos.is_semiopen_file(Us, file_of(s)))
- score += RookOnFile[bool(pos.is_semiopen_file(Them, file_of(s)))];
+ if (pos.is_on_semiopen_file(Us, s))
+ score += RookOnFile[bool(pos.is_on_semiopen_file(Them, s))];
// Penalty when trapped by the king, even more if the king cannot castle
else if (mob <= 3)