King And Knight

Dimitri places a Black King and a White Knight on 2 distinct squares in an empty chessboard. If the probability that Dimitri places the King and the Knight on the chessboard such that the King is not in check (that is, the Knight is not attacking the Black King), can be expressed as mn\dfrac{m}{n}, where mm and nn are coprime positive integers, find m+nm+n.

As an explicit example, if the Knight is on f2\text{f2}, the h3\text{h3}, d3\text{d3}, d1\text{d1}, h1\text{h1}, g4\text{g4} and e4\text{e4} squares are under attack.


This problem is the second of the set Look after the King!.
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