A losing ending

Suicide (or Losing) Chess still continues to be one of the most popular chess variants, especially among junior players. Whether it is a search for variety or a retreat to a simpler form of the game is not clear to me, but the free play portion of a lot of my coaching classes sees more than few Losing chess games.
The diagrammed position is a problem that comes from a Suicide game. It is White to move an win (by forcing black to capture the white king). In suicide chess, capturing is compulsory, so all White has to do is to put his king in 'check'
Have at it.