Black (me) to move.
I took the knight at f3 with my knight at e1. However, Lichess analysis shows that this move is a blunder, and suggests to take the bishop at g2 instead.
IMO, I am winning no matter I exchange the knight or bishop, but I feel hard to understand why exchanging the knight f3 is a blunder?
[FEN "r1bq1rk1/pp3ppp/4p3/2Pp4/2P5/P1B2NP1/3NPPBP/R3nRK1 b - - 0 1"] 1...Nxf3? (1...Nxg2!)