In the Wikipedia article for Eight Queen Puzzle. The last line of solutions section is stated as "Solution 10 has the additional property that no three queens are in a straight line".
But isn't that the mission to not place any queen in straight line? Why it is special for solution #10, I can see all solutions obey the statement. So what am I overlooking?
A "straight line" in this context may be diagonal. Look at solution 1: The four leftmost queens are all in a straight line with slope 2/1.
Each solution besides ten has a similar configuration.
In contrast, any line you draw on Solution 10 will pass through the center of no more than two queens.