Constants
cpp
constexpr Bitboard DEFAULT_CHECKMASK = Bitboard(0xFFFFFFFFFFFFFFFFull);
constexpr auto STARTPOS = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
constexpr auto MAX_MOVES = 256;