A beautiful endgame

 While doing a CM tutorial last night, I learned that the shown position is a dual-zugzwang.  If it's White's move, the position is drawn, if it's Black move, White wins.  I don't know why but I find this strangely compelling as it speaks to the mathematical beauty of the game.  Of course I play through a number of variations to convince myself of this ... then put the kings at random points on the board and saw when one of them could reach the "key squares" first.