Another G/15 on FICS,  I play Black, this time I found it. Interesting that first 3 moves I wanted to play were right,  then 4th move was actually leading only to perpetual, but there is a winning move here as well.  I didn’t get there because he played 3rd move differently,  it was move losing quickly.  I think OTB I would see the right continuation, maybe straight from the beginning.

Can you see the both lines,  winning and perpetual?  Just in case, the answer is in the comment. Black to move: