/// forward_bb() returns a bitboard representing all the squares along the line
/// in front of the given one, from the point of view of the given color:
-/// ForwardBB[c][s] = in_front_bb(c, s) & file_bb(s)
+/// ForwardBB[c][s] = in_front_bb(c, rank_of(s)) & file_bb(s)
inline Bitboard forward_bb(Color c, Square s) {
return ForwardBB[c][s];
/// pawn_attack_span() returns a bitboard representing all the squares that can be
/// attacked by a pawn of the given color when it moves along its file, starting
/// from the given square:
-/// PawnAttackSpan[c][s] = in_front_bb(c, s) & adjacent_files_bb(s);
+/// PawnAttackSpan[c][s] = in_front_bb(c, rank_of(s)) & adjacent_files_bb(s);
inline Bitboard pawn_attack_span(Color c, Square s) {
return PawnAttackSpan[c][s];