Jerome Defense to the Evans Gambit

I recently received an email from Philidor 1792 who shared a game of his where his Evans Gambit Declined was met with a Jerome Gambit-style defense. The game became quite complicated, although our hero won in the end. (Ask not for whom the chess clock flags, it flags for thee...)

Philidor 1792 - guest234
blitz, 3 0, www.bereg.ru, 2015

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4

The Evans Gambit. Black declines the pawn.

4...Bb6 5.a4 Nf6

This is risky, but perhaps Black had already planned his sacrifice.

6.a5 Bxf2+

In the only similar game that I have seen, Black avoided the sacrifice: 6...Bd4 7.Nxd4 Nxd4 8.Nc3 O-O 9.d3 h6 10.Ne2 Ne6 11.f4 exf4 12.Nxf4 Nxf4 13.Bxf4 c6 14 Be3 d5 15.Bb3 Bg4 16.Qd2 Re8 17.exd5 cxd5 18.O-O d4 19.Bf2 Be6 20.Bxe6 Rxe6 21.Qf4 Rd6 22.Bg3 Nh5 23.Qxd6 Qxd6 24.Bxd6 Rd8 25.Bc5 Rb8 26.Bxa7 Ra8 27.Bxd4 Rc8 28.c3 Rd8 29.Rf5 g5 30.Rb5 Nf4 31.Rxb7 Nxd3 32.a6 f5 33.a7 Nf4 34.a8=Q Ne2+ 35.Kf1 Rf8 36.Bc5 Ng3+ 37.hxg3 Rxa8 38.Rxa8 checkmate, Ian Rodrigo Sanchez Su - Enzo Quesada, IRT SANTISIMO NOMBRE DE JESUS 2015 -III. 

7.Kxf2 Nxe4+ 8.Kg1 d5 9.Bb3 Qd6 10.d3 Nf6 11.c3 O-O 

Black has two pawns for his sacrificed piece, plus a solid pawn center, good development and a safe King. While Stockfish 6 rates White as about 1/2 a pawn better, the first player's uncertain King and locked in Rook make things anything but easy.

12.b5

Choosing the Queenside to battle. Otherwise, 12.Bg5.

12...Nxa5 13.Ba3

The computer gives a couple alternative lines: 13.Rxa5 Qb6+ 14.d4 Qxa5 15.dxe5 Qb6+ 16.Nd4 Nd7 17.Bf4 c6 18.bxc6 bxc6; or 13.Bc2 Qb6+ 14.d4 Re8 15.h3 e4 16.Ne5 Rxe5 17.Rxa5 Bd7 18.Ra3 Rf5. 

13...Qb6+ 14.Kf1 Ng4 

Things are becoming uncomfortable for White - but, remember, he is a master of the 3 0 blitz game, and, as the Rolling Stones sang, "Time is on my side."

15.Qe2 Nxb3 16.Ra2 Ne3+ 17.Ke1 e4 18.Nd4 Nxd4 19.cxd4 Qxd4 White won on time