Why is Qf5+ such a good move here?

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Avatar of th3bub14

https://www.chess.com/live#a=532285

I ran analysis and it kept telling me that Qf5+ was the best move there, but I didn’t see any way to capitalize off of it. It just looked like checking for the sake of checking, why?

Avatar of th3bub14

I messed up that link lol. This is the notation, but idk how to link a game.