Serangan Checkmate

Queen Ending

What is black best move?
Answer: highight in between bracket
[1...Qf3 threaten f6++. 2.Qe5 f6+ 3.Qxf6 Qg4++ 0-1]

You have to bid higher to win a prize......

Black appears in trouble but it is his turn to move. Can he win?
Answer: highlight inside the bracket below
[1....,Qf2+!! 2. KxQf2, g1Q+ 3.Kf3, Rf6+ and white has to give up queen]

Can you spot how white win......?

Black has just move....Be7?? How could white finish off black's resistence?

Answers: highlight in between bracket for answer/clue
[... 2.Qxe7+,Nxe7 3.Nf6+ ... 1-0]