#endif // defined(IS_64BIT)
-const Bitboard SquaresByColorBB[2] = { BlackSquaresBB, WhiteSquaresBB };
+const Bitboard LightSquaresBB = 0x55AA55AA55AA55AAULL;
+const Bitboard DarkSquaresBB = 0xAA55AA55AA55AA55ULL;
+
+const Bitboard SquaresByColorBB[2] = { DarkSquaresBB, LightSquaresBB };
const Bitboard FileBB[8] = {
FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB