When assembling a defense to a sketchy attack like the Jerome Gambit, it is always best to double check your work. Black does not do so in the following game - with a time control of 1 minute, no increment, there is not much time for reflection - and immediately pays the price. Later on, the game is decided, ironically, by a double check.
angelcamina - The_KGD
1 0 bullet, lichess.org, 2019
1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bc4 Bc5 5. Bxf7+
The Italian Four Knights Jerome Gambit.
5...Kxf7 6.Nxe5+ Nxe5 7.d4 Bb4
Black is not just saving his Bishop, he is pinning the enemy Knight that protects the e4 pawn. In doing so, he overlooks that the pawn is also indirectly defended. Better was the direct 7...Bd6 8.dxe5 Bxe5.
8.dxe5 Nxe4 9.Qd5+
The point.
9...Ke8 10.Qxe4 a5
It is unclear what Black has in mind. Perhaps it is a do something, quickly move in bullet.
11.O-O g5
This falls to a tactical onslaught.
12.Nd5 Bc5 13.Nf6+ Ke7 14.Bxg5 h6 15.Nd5+ Black resigned
Black will lose his Queen, and then be checkmated.