Module bitboard 

Constants

ALL_SQUARES

Bitboard with all 64 squares set.

FILE_ABB

Bitboard with all squares on file A set.

FILE_BBB

FILE_CBB

FILE_DBB

FILE_EBB

FILE_FBB

FILE_GBB

FILE_HBB

RANK_1BB

RANK_2BB

RANK_3BB

RANK_4BB

RANK_5BB

RANK_6BB

RANK_7BB

RANK_8BB

Functions

between_bb

Return the bitboard of squares strictly between s1 and s2.

line_bb

Return the bitboard of all squares on the same rank, file, or diagonal as s1 and s2 (including both endpoints).