The question of the Tangshan nine-square grid competition was wrong
The solution of the nine-square grid competition is analyzed item by item
The nine-square grid, also known as beginner sudoku, is a simplified version of the Sudoku game that is perfect for beginners to get started. Its rules are very simple: in a 9x9 grid, place a chain of numbers 1-8. Find the corresponding question on many Sudoku game websites, just follow the steps below to easily solve it.
Step 1: Observe first: the observation house, that is, the 3x3 grid. Observe if only one row of houses has numbers to easily find candidate numbers. For example, if there are only the numbers 3 and 6 in the middle of the house, if the other numbers in the other two rows of a palace are already complete, and there is a 6 in the next row, there must be 3 in this row.
Step 2: Speculate: Using known information to speculate on unknown numbers is an effective strategy. For example, a common number A appears frequently in two rows of a certain palace, and A also appears in the other house and the conflict area.
Step 3: Positioning: For difficult questions, combine the tools of "Horizontal + 3" to display the sum and "Vertical + 4" to display the sum to assist in generating candidate numbers. This feature increases completion to 90% by just a few more isolated numbers.
Tips to share: Make good use of the residual exclusion method. If only one A is needed in a house (e.g., a house with only one vacancy), the entire candidate number can be listed, arranged with other houses, and the same number can be excluded to further reduce the feasibility.
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