I recently consulted The Database.
There are 315 games where I played the Jerome Gambit with its regular move order, 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+. I scored 82%.
There are 59 games with the Italian Four Knights Jerome Gambit position, 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Nc3 Bc5 5.Bxf7+. I scored 74%.
There are 58 games with the Semi-Italian Jerome Gambit, 1.e4 e5 2.Nf3 Nc6 3.Bc4 h6 4.0-0 Bc5 5.Bxf7+. I scored 88%.
There are 58 games with the Semi-Italian Four Knights Jerome Gambit, 1.e4 e5 2.Nf3 Nc6 3.Bc4 h6 4.0-0 Nf6 5.Nc3 Bc5 6.Bxf7+. I scored 78%.
Not bad, for a refuted opening.
However, there are worse things than losing to the Jerome Gambit. For example, what if White, on top of playing his "busted" opening, suddenly blunders? His only chance is if... if...?
I should blush.
perrypawnpusher - Leoleon
2 12 blitz, FICS, 2017
1.e4 e5 2.Nf3 Nc6 3.Bc4 h6
The Semi-Italian Opening.
4.O-O Nf6 5.Nc3 Bc5 6.Bxf7+
The Semi-Italian Four Knights Jerome Gambit.
4...Kxf7 7.Nxe5+ Nxe5 8.d4 Bxd4 9.Qxd4 d6
This is a novelty according to The Database. I have faced the alternative 10...Nc6 18 times, going 10-5-3. That's 64%, which is decent - but below my total score against the line.
11.Qe3 Nc6 12.b3
Instead, 12.e5 looked premature.
I racked my brain trying to figure this out. Was my opponent actually considering ...g7-g5 ? Actually, in light of his next move, this looks like a mouse slip.
A better placement. See the note above.
Better might have been 14.Qd3 followed by 15.Rae1.
Simply a blunder. I know we were playing a fast blitz game, but this is not due to the "33rd piece".
Of course. There are worse things than sacrificing two pieces in a dubious opening, and then going down to ignominous defeat - like sacrificing two pieces in the opening and then blundering away the exchange and then going down to ignominious defeat.
Oh, no! The "34th piece" strikes again!
17.gxf3 Black resigned
Yes, there are worse things than losing to the Jerome Gambit - like White further blundering away the exchange, only to be "rescued" by a piece-dropping mouse slip by Black... My opponent could have played on, but I think he was no longer in the mood. I could sympathize mightily.