Bf6 Kh7
Rg7 Kh6 (Kh8 loses to a discovered check)
Then the knight is pinned and the black king is stuck on the H file, so the white king can move up and trade down to K R vs. K? You’d just have to make sure you don’t get forked by a knight check when moving up.
But that seems too simple so I’m probably missing something.
I’m no good at endgames bit but I assume it’s…
Bf6 Kh7 Rg7 Kh6 (Kh8 loses to a discovered check) Then the knight is pinned and the black king is stuck on the H file, so the white king can move up and trade down to K R vs. K? You’d just have to make sure you don’t get forked by a knight check when moving up.
But that seems too simple so I’m probably missing something.
The problem is that the knight can unpin itself, giving White no time to move the king up like that.