White to move...

and mate in three. This was from a game played between Garcia Vega and Gorer in Rosario, 1939. If you remember Boden's Mate the win should be obvious.

This puzzle was taken from Fred Reinfeld's book, How To Force Checkmate. This little book has 300 practical mates starting with one movers and then two movers and finally three-movers. What I like is that all of them start with forcing moves like sacrifices or checks, just like real games, which is what they were taken from.