Ottó Bláthy, The Chess Amateur, 1922
White to play and win
NM Adarsh Jayakumar showed me this problem when he was ten years old. (His teacher, IM Stan Smetankin, had given it to him for homework.)
If you enjoy this problem, Steven Dowd's latest column in Chess Life Online has similar fun stuff! As you've doubtless already learned from your PlayStation or Xbox, sometimes a king and one other piece can take out an entire army.