Changde Challenge Nine Palaces 2019

　　In today's digital age, the Nine-Square Grid Challenge has become a popular puzzle game. This kind of game not only improves your intelligence, but also exercises your problem-solving skills. In this article, we will guide you step by step on how to complete the nine-square grid challenge and share some useful tips and advice.

Before you begin:

　　First, we need to clarify the basic rules of the nine-square grid challenge: in a 3x3 grid, fill in the numbers 1-9 and make sure that the numbers in each row, column, and two diagonals are not repeated. It may sound complicated, but don't worry, we're taking it one step at a time.

Step 1: Fill the edges

　　This is not difficult, it just requires two steps, because it requires no duplicate numbers in rows, columns, and diagonals. The specific operation is: fill in the first line with the number 3,5 and the number 7,9 in the last line. This step takes advantage of the simple fact that there is only one 3 and one 5 in any 9 grid, arranging the two numbers that are least likely to appear in the center row or column.

Step 2: Determine the center number

　　Now, to fill in the middle square with the number 4, since it is the most common and usually centered number. In the process, you may have noticed that other numbers are also restricted in position accordingly.

Step 3: Fill in the remaining numbers step by step

　　The next step is a more cumbersome process, at which point the method of logical inference can be used. If you look at the sidelines you filled in in more detail, you will conclude that these positions are possible positions for other numbers. For example, if a vacancy is in column 1 of the second row, the more likely number may be 2 or 6 (assuming there are other number limits).

Tips Sharing:

1. Consider step by step: Divide the entire board into small parts to consider, focusing on a corner or side at a time.
2. Utilize double-sided squares: If the other cells on the two rows and columns where a grid is located are filled with numbers, then the number of the grid is also determined. For example, if only 3 and 7 are left in column 1, and the number in the middle is 3 in rows 1 and 2, then column 1 of row 1 is filled with 3.

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