this post was submitted on 25 Jul 2025
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The rule is better said that you can visit each square "once and only once." Every time you move to a non-adjacent square, you're crossing a square for a second time and breaking the rule.
If you can only move to black squares from white squares then for a sequence with an even number of terms if you start on a white square you have to end on a black square. Because the problem states you have to start and end on white it's impossible to do without crossing over squares.