What makes this an inaccuracy?

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Avatar of qepx

What makes move 15 for black an inaccuracy in this game? I'm pretty sure I wouldn't have won if I didn't play this move, it was the last chance I had. I can't think of any of the details, but that was definitely the objective of the move, which worked effectively. I mean, I was 7 points down, what other choice did I have?