Sudoku is a nine-square grid, and each grid is divided into nine small grids. Give a known number in this eighty-one grid, and use logic and reasoning to fill in the number of 1-9 in other blanks. Make every number of 1-9 appear only once in every row, column and house.

Please look at the following example. The more numerical conditions are given in advance, the faster the problem will be solved.

Extended data:

Sudoku is a mathematical game that originated in Switzerland in the18th century. It's a logic game with paper and pen. Players need to infer the numbers of all remaining spaces according to the known numbers on the 9×9 disk, and ensure that the numbers in each row, column and thick line palace (3*3) contain 1-9, which is not repeated.

References:

Sudoku-Baidu encyclopedia