The endgame...just calculation

I think it was a Daniel King video I watched where he said that the endgame in chess was just calculation, especially when down to a small number of pieces on the board.

He showed how it was done, introduced endgame studies, and how they could help improve both endgame understanding and calculation.

This isn't a study, but it is a very simple problem, as long as you just think it through.

White to move after Ne5-f3