Description

Sudoku (shù dú) is a mathematical game from Switzerland in the 18th century. It is a logic game that uses paper and pen for calculation. Players need to infer the numbers of all remaining spaces based on the known numbers on the 9×9 disk, and satisfy that the numbers in each row, each column, and each thick line palace (3*3) contain 1-9, not repeated .
The sudoku plate is a nine palace, and each house is divided into nine small cells. In the eighty-one grid, given certain known numbers and problem-solving conditions, using logic and reasoning, fill in the other spaces with numbers 1-9. Each number from 1 to 9 appears only once in each row, column, and house, so it is also known as the "nine house grid."

Basic solution:
Exclusion method (exclusion method)
Exclusion method: Use the numbers to find the only fillable spaces in the unit, which is called the exclusion method, and the number only fillable spaces is called the exclusion method (Hidden Single).
According to the different scope of action, the residual solution can be divided into the following three types:
The number can be filled with a unique space in the "Gong" unit is called "Hidden Single in Box" (Hidden Single in Box).
The number can fill in the only space in the "row" unit is called the row exclusion method (Hidden Single in Row), also known as the row exclusion method.
The number can be filled with a unique space in the "column" unit is called column exclusion method (Hidden Single in Column), also known as column exclusion method.
Unique remainder method
Peer allele group
Peer allele group
Unique remainder method: Use the grid to find the unique fillable number, called the remainder method, and the unique fillable number in the grid is called the Naked Single.
The remainder method is a method of deleting the numbers that have appeared in the peer group lattice (Peer). There are 20 equivalent group lattice bits in each lattice.

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