Among the nine numbers in the Nine Palaces, Sudoku is divided into three pairs of "couple" numbers
Among the nine numbers in the Nine Palaces, Sudoku is divided into three pairs of "couple" numbers and three unpaired "hole" numbers—— Liang Haisheng
Among the nine numbers in the Nine Palaces, Sudoku is divided into three pairs of "couple" numbers and three unpaired "hole" numbers—— Liang Haisheng