Hint
The move equalizes the position.
Bigger hint
It's a seemingly crazy move.
Answer
44...be3!!
NikoTheodorou vs. royalfork56 | Analysis
It was a speed chess game that I just watched live. My brain told me black was toast but the eval bar said the position was equal. I couldn't believe it.
Black only had 11s and he must have decided it was hopeless so he resigned.
If it's late game and stockfish calls it perfectly even, that usually means one of the lines leads to a stale mate, in this case, by repetition. That does require both players to play "perfectly" and not make any huge blunders, but I wouldn't say it takes computer players to do that. If this wasn't speed chess, an IM and a GM would find it pretty quickly.