Grandmaster Alexandra Kosteniuk gives you one hell of a chess lesson in this video tutorial for the determined. This chess game will show you how to perform a tricky checkmate in one move with a useful moral, presented by guest star Almira Skripchenko.
The apparent answer is moving the White Knight, but that is not the case. It is a classic example of Retrograde Analysis. It is not even White's turn. Check out this tricky chess endgame problem to figure out what exactly is going on here.