Hint 1
It's mate in 4.
Hint 2
Nf7+ then Nh6+
The solution is here - https://www.chess.com/analysis/game/live/120785379743?tab=analysis&move=59 - check top of the right sidebar.
I started trying something new when I watch speed chess.
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Sometimes I watch players stronger than me but not too much stronger than me.
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I keep the evaluation bar off so I'm forced to think without hints. I'm way too addicted to the elav bar.
Spoiler - I mention what I saw in real time.
I watched this game a few minutes ago. I thought I was clever to notice Nf7+ and Nxd8 which wins the rook. But even though I love smothered mates - I didn't even think to look for that. When white played Nh6+ I nearly groaned. What the- Oh! I missed it! Fuuuuuuck!
I checked the solution and it was much simpler than I expected; can't the pawn just kill the knight to avoid the king having to move back/forth? Doesn't seem like checkmate since to escape check it is legal to capture the threatening piece.
The king is also put in check by the queen, taking the knight doesn’t remove that threat.