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?
Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. It only takes a minute to sign up.Sign up to join this community
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.