It is not difficult to see from the above that the problem is that you must move one step after choosing a point, which will often destroy the original chess layout and form a dead end.
I was confused when I first saw the pattern, but I found a rule after two restarts: just like we can finish it by drawing a five-pointed star! In fact, the principle of that chessboard is the same as that of drawing a Pentagon. There is no need to repeat the route after selecting any point, and it can be connected end to end with only one stroke. And there are more flags on the chessboard than there are flags (this is the key).
Specific way:
Choose the position of the first flag at will. Connect with this flag as the starting point, put the flag at the second inflection point (not in a straight line with the first point), take a step back, just return to the point in a straight line with the first flag, and restore the normal connection order. Conversely, the flag at the back is separated from the flag at the front by an inflection point, and then comes back. Finally completed.
Legend: The sequence of 1-7 is 1-2-3-4-5-6-7- 1 (one stroke forms a chessboard pattern, end to end).
Set the first chess game to 1 (anywhere). Put the second game of chess after 3 o'clock, take a step back and return to the second point; Put the third game at 4 o'clock, step back to 3 o'clock, and so on.
I found it online. I don't know if it's right or wrong. Give it a try! !