I have heard of it. Know nothing whatsoever about it 🙂
Ponziani.

Ponziani Opening
The Ponziani Opening is a chess opening that begins with the moves:
It is one of the oldest chess openings, having been discussed in literature by 1497. It was advocated by Howard Staunton, generally considered the world's strongest player from 1843 to 1851, in his 1847 book The Chess-Player's Handbook. For some decades, it was often called "Staunton's Opening" or the "English Knight's Game" as a result. Today, it is usually known by the name of Domenico Lorenzo Ponziani, whose main contribution to the opening was his introduction, in 1769, of the countergambit 3...f5!?
The opening is now considered inferior to 3.Bb5, the Ruy Lopez, and 3.Bc4, the Italian Game, and is accordingly rarely seen today at any level of play. Magnus Carlsen used it for a victory in 2013.[1]Black's main responses are 3...Nf6, leading to quiet play, and 3...d5, leading to sharp play. Ponziani's countergambit 3...f5!? was successfully played in the grandmaster game Hikaru Nakamura–Julio Becerra Rivero, US Championship 2007.[2]

I play it from time to time.
This is an interesting story, including the comment by FM David Sprenkle. Nothing was pasted from Wikipedia.
http://chessskill.blogspot.com/2014/02/losing-my-virginity-with-ponziani.html

it puts white in a very passive positon where blacks the one in the drivers seat, i dont recommend it

I faced this as black couple of times and it just doesn't have the firepower that Spanish, Scotch or Italian has, in my experience.

I much prefer the Spanish and the Scotch. But if you're a complete beginner, you can try it if you really want to.

I took it up after going through all extant games of Rezso Charousek. He lost one of his games to the Ponziani and the opened got my attention.

I took it up after going through all extant games of Rezso Charousek. He lost one of his games to the Ponziani and the opened got my attention.
I think I saw that game! Is that the one against Maroczy where white sacs his queen?

I know the Ponziani well but i have to say that in practical games ,the chance to deliver a ponziana variation occurs maybey less then 10 % .
My Xperience tells me most players ' moves are not 100% compatible with a working ponziani tactic or players know the ponziana well enough to avoid moves that end in tragic loss of pieces that leads to loss of game.
Good day 2 All

Talk to me about your experience of this opening please.
kind regards. in advance.