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15. Nxc6 mistake or blunder?



So I played this game on chess.com as white (Blacks rating was 1041 since it was my first game there), and according to their analysis 15. Nxc6 was a blunder but Lichess has it down as a mistake. Can anyone tell me why it was a mistake/blunder?
qd2 threatens the knight and if the knight retreats then ra1 qb3 ra3 wins the queen therefore qb3/a4/a5 is forced
if qa5 ra1 forces it away from the knight
if qa4 ra1 qb3 ra3 qc2 qb4 wins
if qb3 rc3 qa4 ra3 transposes
therefore qd2 wins a piece
From computer's point of view it's somewhere between mistake and blunder. I would say it's more like a mistake, because white is still winning.
It is neither mistake, nor blunder: white is winning anyway.

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