Interesting Sacrifice in King’s Gambit

I recently stumbled upon a fun pseudo sacrifice in an important theoretical line in the King’s Gambit. I had the exact position after White’s 13th move, but I overlooked it completely during the game, and then in analysis, until Stockfish engine pointed it out to me. Can you spot the best move for Black?

 

1.e4 e5 2.f4 exf4 3.Nf3 d5 4.exd5 Nf6 5.Bb5+ c6 6.dxc6 Nxc6 7.d4 Bd6 8.Qe2+ Be6 9.Ng5 O-O 10.Nxe6 fxe6 11.Bxc6 bxc6 12.Qxe6+ Kh8 13.O-O

 Black to move

Hint: the move I am talking about is not f4-f3, which is also not bad, but not as strong.

Replay a sample game below to see the solution