There is a line in the Blackburne Shilling Jerome Gambit where the Black King wanders far in search of adventure (and material). In the following recent game a capture seems to lead to an "Instant Victory", but things are not as simple as they appear.
kukkfive - Krait
standard game, FICS, 2010
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nd4
The Blackburne Shilling Gambit.
4.Bxf7+
The Blackburne Shilling Jerome Gambit.
4...Kxf7 5.Nxe5+ Ke6
6.c3 Kxe5 7.cxd4+ Kxe4
This looks even more dangerous for the King than 7...Kxd4. Best was the retreat 7...Ke6 8.Nc3 Kf7 when Black maintains an edge.
8.Qg4+
Is this the killer move? At one point (in one game), I thought so. Certainly a number of moves have been tried successfully, but that's not the complete story.
8.0-0 Qf6 (8...Nf6 was a better test, although White can continue with 9.Qf3+ with hopes for an advantage) 9.Qc2+ Kxd4 10.b4 Kd5 11.Bb2 Qg6 12.Qb3+ Kd6 13.Re1 b6 14.Be5+ Kc6 15.Rc1+ Kb7 16.Rxc7+ Kb8 17.Rc6+ Black resigned, fidotopdog - Krait, FICS, 2009;
8.d3+ Kxd4 (better was 8...Kd5 and after 9.Qb3+ Kc6 10.Qc4+ Kb6 White can do little more than continue checking and arrange a draw) 9.Be3+ Kd5 10.Nc3+ Ke6 11.Qg4+ Kf7 12.Qh5+ Ke7 13.Nd5+ Ke6 14.Nf4+ Kd6 15.Bc5+ Kc6 16.Rc1 Nf6 17.Be7+ Kb6 18.Qc5+ Ka6 19.Qa3+ Black resigned, Jeopar - Krait, FICS, 2009;
8.Nc3+ Kxd4 9.Qg4+ (9.Qf3 transposing to 8.Qf3 is the right idea, but White gets away with his move) 9...Ke5 (9...Kc5 was the way out) 10.d4+ Kd6 11.Bf4+ Ke7 12.0-0 Kf7 13.Qh5+ g6 14.Qd5+ Kg7 15.Ne4 Nf6 16.Nxf6 Kxf6 17.Bg5+ Black resigned, kingpro - Krait, FICS, 2009;
8.Qh5 Kxd4 (8...g5 is the right move for Black, forcing 9.Qf3+ Kxd4 10.Nc3 transposing to 8.Qf3) 9.d3 Bb4+ 10.Nc3 Bxc3+ 11.bxc3+ Kxc3 12.Qc5+ Kxd3 13.Qd5+ Kc3 14.Bd2+ Kb2 15.Qb3+ Kxa1 16.0-0 checkmate, Melao Jr.,H - Danilo, Centro Cultural, 1996;
8.Qf3+ (the best move for White) Kxd4 9.0-0 (instead, 9.Nc3 c6 10.Qe3+ Kc4 11.a4 and the mating net closing around Black's King will force him to give up his Queen one way or another) 9...Qf6 (after 9...Kc5 Black's King may be able to walk away from the battle, giving White only the opportunity to draw through repetition of Queen checks) 10.Qg4+(necessary was 10.Qe3+, winning) Kc5 11.Nc3 d5 12.Qa4 a6 13.b4+ Kd6 14.Bb2 c6 (moving the Queen to g6 avoids the now possible 15.Ne4+ although Black may still hold on with three pieces for his Queen after 15...dxe4 16.Bxf6 Nxf6) 15.Nd1 (this should lose) Qf4 16.Re1 Qe4 (a mouse slip, perhaps??) 17.Rxe4 Black resigned, GOH - kremba, FICS, 2009.
8...Kd5 9.Nc3+
Now, after 9...Kc6, as implausible as it seems, Black's King is secure. Even after 10.d5+ Kd6 the game is complicated, but even.
9...Kd6
What a difference a square makes!
10.Qf4+
After 10.0-0 I needed cooperation from my opponent to win in perrypawnpusher - MNUNP, blitz, FICS, 2009 (1-0, 18).
The strongest move here, tightening the net, is 10.Qe4.
10...Ke7
A slip. Better for Black (the move, the game) was 10...Ke6. Now things turn simply horrible for him.
11.Nd5+ Ke8 12.Nxc7+ Ke7 13.Nxa8 d6 14.0-0 Kd7 15.Qf7+ Kc6 16.d5+ Kc5 17.d4+ Kxd4 18.Be3+ Kc4 19.Rac1+ Kb5 20.Nc7+ Ka5 21.Qf4 Black resigned