Anything besides 1...gxf3 and black will win.
But whatif black doesn't take the pawn ??
H O G W A S H
LOL
blame the book
Blagy -- that 4...g3?? is a nice cautionary tale! How easy to throw away a win with careless play... and if instead Black had bothered to look for better moves he would have been able to end the game very quickly.
U Should look for more ways that the opponent can save itself
HAHAH
Nice one!