Chess Puzzle of the Week No 2

Another stumper! well for me anyway, it took me twice as long as chess puzzle 1 to figure out. I hope you guys enjoy it :).

White to move mate in 2.

Chess Puzzle of the week No 1

I have decided to put a chess puzzle on my blog at least once a week. Mainly to force myself to do at least one chess puzzle a week along with my chess playing. Hopefully these puzzles will help me improve my game.

The puzzle below was created by Max Euwe who was world champion from 1935 - 1937. White to move, mate in 2. Post up you answer if you think you have it, even better post up your answer in algebraic chess notation - I need to get used to understanding it.