Pithy formula: 2 and 4 are shoulders; 6. 8 is sufficient; Upper 9 and lower 1; 7 on the left and 3 on the right, that is, 294753618. First write 1 in the middle of the first row, and the number 2 is carried in the corresponding square of the last row of the next column adjacent to 1. Fill in the number in the upper right corner. If the rightmost column cannot be filled in the upper right corner, fill in the number at the leftmost end of the previous row of this row. It cannot be filled in the upper right corner, but can be filled in the lower part of this column. From one to nine, every sum of three numbers, horizontal, vertical and oblique, is the answer to a sum. It is also the usage of all connected numbers in the Jiugong grid. This game can test people's reasoning ability about numbers. （JiuGongGeKouJue）
Jiugongge formula
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