Answer
- Nf6+!!
It’s checkmate in 2 in one of two ways.
47…Qxf6
48. Qg4#
47…Kh4
48. Qh3#
https://www.chess.com/analysis/game/live/97535431411?tab=analysis
It’s a speed chess game I just watched. Let me know if I screwed this up. I can’t copy and paste from the site.
I was so fixated on how black was going to win - I didn’t see the danger at all. I only knew black was toast due to the evaluation bar suddenly indicating mate in 2.
[Edit - I fixed a mistake]
Not op, but your original notation is for pawns.
Fuck, pawns have a special notation that only they use? I thought I could just name the starting square and the square it finishes on and people would understand? How else am I supposed to answer without learning a special language?