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Challenge : improve on a GM game (1)

Chess
Can you spot the win ?

Of course you have the advantage that you now know that there is a win. The GM playing black overlooked the option and the game ended in a draw.

https://lichess.org/study/Ce8ZBq1R/n0Gx6VfE#55

Feel free to pause this blog post and find the solution yourself.
I will post the solution and the full game in a few days time.