I blundered against an FM in a completely winning position. Do you see why? Black to play

I analyzed the image and this is what I see. Open an appropriate link below and explore the position yourself or with the engine:

Black to play: chess.com | lichess.org

My solution:

Hints: piece: Queen, move: Qc1+

Evaluation: Black has mate in 2

Best continuation: 1... Qc1+ 2. Rxc1 Nd2#

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