This came from a blitz game I played earlier tonight. Obviously anything wins since white is a piece up, but the game can be ended right away with 1.Qb4! forking the rook on a5 and the rook on f8. The game continued 1...Ra4 2.Qxf8+ Resigns, 1-0
Not a difficult problem but queen sacs are always fun
Just on initial guess, I'd assume 1. Rxf7. Rook is poisoned. IE ...Rxf7 2. Rc8+ Rf8 3. Rxf8+ Kxf8 4. Qb4+, forking the king and rook. But there has to be something else other than just simplification.
AH! Just spotted it. 1. Qb4! immediately, forking both rooks.
Saw 1.Qb4 almost immediately but also noticed 1.Rxf7 Rxf7 2. Rc8+ with 3. Rxf8+, 4. Qb4+ and 5. Qxa5. I know this happened in a game, but as a combinations problem, maybe place a Black B on a8.