On a $3\times3$ grid we have:
with $8$ moves needed to swap the red and blue knights.
What is the minimum numbers of moves to swap the knights on a $4\times4$ grid?
Answer
It will take:
20 moves to swap the knights
This can be done as follows:
All credit goes to @klm123 for demonstrating a good way to visualize this in a similar puzzle.
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