Jerome Gambit Declined: Just Move

A major shortfall of declining the Jerome Gambit is that Black passes up a "won" game for one in which he has a clear disadvantage - a pawn down, a King who cannot castle.

A minor shortfall, as the following game illustrates, is that White can play his game, move-after-move, without having to take a lot of chances, or even having to put a lot of thought into his move choices.

Wall, Bill - Guest1064582
PlayChess.com, 2017

1.e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Bxf7+ 

4...Kf8 

The Database has 278 games, with this position. Curiously enough, despite his advantage, White scores only 55%. Still, this is better than the 45% that White scores in the Jerome Gambit accepted line. (Please remember that The Database largely reflects the actions of online club players.)

Bill has also faced 4...Ke7 in the eyeblink 5...Bxg8 Rxg8 6.d4 Black resigned, Wall,B - Guest2877685, PlayChess.com, 2015. (The Database 42 games with this form of declining, with White scoring 73%) 

5.Bd5 

Bill has also played:

5.Bxg8 Kxg8 6.O-O Qf6 7.Nc3 Ne7 8.d4 exd4 9.Bg5 Qg6 10.Bxe7 Bxe7 11.Nd5 Bd6 12.e5 c6 13.exd6 cxd5 14.Re1 Qxd6 15.Re8+ Kf7 16.Rxh8 Black resigned,Wall,B - Guest558953, PlayChess.com, 2017;

5.Bc4 Bxf2+ 6.Kxf2 Nd4 7.Nxd4 exd4 8.Qf3+ Qf6 9.Rf1 Qxf3+ 10.Kxf3 Nf6 11.d3 Ke7 12.e5 Nh5 13.Bg5+ Nf6 14.exf6+ gxf6 15.Re1+ Kd6 16.Bf4+ Kc6 17.a4 d5 18.Bb5+ Kc5 19.Bxc7 a6 20.b4+ Kxb4 21.c3+ Kc5 22.cxd4+ Kb4 23.Bd6+ Ka5 24.Nc3 axb5 25.axb5+ Kb6 26.Bc5+ Kc7 27.Nxd5+ Black resigned, Wall,B - Guest1393049, PlayChess.com, 2013;

and 5.Qe2 (Bill has also played this move in the Jerome Gambit accepted: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Kxf7 5.Qe2 Nf6 6.Qc4+ d5 7.Qxc5 dxe4 8.Nxe5+ Nxe5 9.Qxe5 Re8 10.Qb5 Qd4 11.O-O c6 12.Qb3+ Nd5 13.Nc3 Be6 14.Qxb7+ Ne7 15.Re1 Bd5 16.b3 Kg8 17.Bb2 Rf8 18.Qxe7 Qxf2+ 19.Kh1 Rae8 20.Qg5 e3 21.Nxd5 exd2 22.Qxg7 checkmate, Wall, Bill - Asesino, Chess.com, 2010) 5...Qf6 6.Bb3 Nd4 7.Nxd4 Bxd4 8.O-O d6 9.c3 Bb6 10.d3 Ke7 11.d4 Nh6 12.dxe5 Qxe5 13.Bxh6 gxh6 14.Nd2 h5 15.Nc4 Bg4 16.Qd3 Qc5 17.e5 Raf8 18.exd6+ cxd6 19.Rae1+ Kd8 20.Nxd6 Kc7 21.Re7+ Kb8 22.Rxb7+ Ka8 23.Qe4 Rxf2 24.Rxb6+ Black resigned,Wall,B - Buster, Chess.com, 2011.

5...d6 6.Nc3 Bg4 7.d3 Qf6 

8.Nb5 Rc8 9.Bg5 Bxf3 10.Qxf3 Qxf3 11.gxf3 h6 12.Be3 Nd4 13.Bxd4 exd4 

14.Be6 Re8 15.Bxg8 Rxg8 16.Nxc7

White is now up two pawns. He doesn't have an attack on the enemy King, but he doesn't need one.

16...Re7 17.Nd5 Re6 18.f4

Even here, the "Jerome pawns" can be of help.

18...Rg6 

Black goes after the open g-file, but it does not amount to anything.

19.Ke2 Kf7 20.f5 Rg4 21.Kf3 h5 22.h3 Rg5 23.h4 Rg4 24.Nf4 

Black's advanced Rook is in danger after all that pawn dancing: if now 24...Rh8 to protect the h-pawn, then 25.Nxh5, anyway.

24...g6

Nothing is going to shore up the Kingside.

25.fxg6+ Ke7 26.Rag1 Rxf4+ 27.Kxf4 Rf8+ 28.Kg5 Black resigned