The question of the Zhucheng Nine Square Grid Competition is wrong

The solution of the nine-square grid competition is analyzed one by one

　　The nine-square grid, also known as Sudoku for beginners, is a simplified version of Sudoku that is perfect for beginners to get started. The rules are very simple: in a 9x9 grid, place a chain of numbers 1-8. Find a question on many Sudoku websites and simply follow the steps below to easily answer it.

Step 1: Observe first: Observation Palace, i.e. a 3x3 lattice. Candidates can be easily found by observing whether there is only one row in some houses. For example, if there are only numbers 3 and 6 in the middle of the house, if the other numbers in the other two rows of a house are already ready, and 6 is killed in the next row, then there must be 3 in this row.

Step 2: Speculate: Using known information to speculate on unknown numbers is an effective strategy. For example, if there is a common number A in two rows of a certain house, and there is also a A in the other house and the conflict zone, it is judged that there must be an A in the position of the other exclusion area of this house.

Step 3: Positioning: For more difficult questions, the tools of "Landscape +3" display sum and "Portrait +4" display sum are used to help generate candidate numbers. This feature can increase the completion rate to 90% by isolating a few more numbers.

Tips and tricks: Make good use of the residual elimination method. If only one ace is required in a house (e.g., a house with only one vacancy), the entire number of candidates can be listed and arranged with other houses to exclude the same number in order to further narrow down the possible range.

　　Try our practice questions for free to improve your skills! Through the continuous exercise and analysis of the questions, you can feel the process of getting started and going deeper! Make full use of the [Hidden Benefits] on the website to receive exclusive topics and strategies! Continue to find the secret of cracking the logic, and experience the joy and sense of accomplishment of solving the nine-square grid! The transition from novice to veteran is just a matter of trying and sticking to it step by step. Good luck with your challenge!