Difficulty:
Primary
Error:
0
/3
Time:
00:00
Sudoku high-level problem solving technique
When the underlying "intra-uterine exclusion" cannot solve the problem, you need to understand the following evolutionary logic:
Single Candidate (Naked Single)
This is the simplest logic: if a square is in its row, column and 3x3 There is only one number in the palace, and that number is the answer.
Block Exclusion (Pointing Pairs)
If a number can only appear in the same row (or column) in a particular palace, then neither the row (or column) nor the squares in the other palace can contain that number.
X-Wing (X Wing)
If in two rows a number can only appear in the same two columns, then in all other rows of both columns the number can be excluded. It's the key to breaking the SAS.
Common Question Answers (FAQ)
- Q: Is there a solution to the Sudoku game? A: Yes, a qualified Suudoku puzzle must have one and only one solution. The topics generated by this station are subject to algorithms to ensure the uniqueness of the solution.
- Q: What is the “expert” level difficulty? A: Expert-level topics usually require complex chain reasoning (e. g. XY-Wing or Simple) Chains）。 It is recommended that the challenge be taken up once the basic skills are fully mastered.
- Q: How do you use notes? A: Click on the Note button or `N' on the keyboard key switch. In Note Mode, you can fill in the possible numbers as a reference and not count as an error.