generally it's a draw unless the K+N are trapped on the edge of the board, and even then, it's sometimes a bit of a tossup.
What happens in a King & Horse vs & King & Rook end game?

From what I can tell, if it is a win, it should be within the 50 move draw rule. Here's a position that, at a minimum, takes at least 27 moves to win.
R.Reti 1929, white to move
Black: Kc3 Ng5
White: Ke3 Rf6
I'm wondering if anyone out there is aware of a position requiring more than these number of moves to win?

It's winable if the Knight side plays poorly. He should keep his King and Knight close to each other at all times and then a draw should be the outcome.

Sometimes you win, sometimes you lose
And most times, you choose between the two
- Sweet Seasons - Carole King
From what I can tell, if it is a win, it should be within the 50 move draw rule. Here's a position that, at a minimum, takes at least 27 moves to win.
R.Reti 1929, white to move
Black: Kc3 Ng5
White: Ke3 Rf6
I'm wondering if anyone out there is aware of a position requiring more than these number of moves to win?
Anyone know?