The following game is a good example of how defense - especially defending against an attack on the King - is more difficult than attack. Black has ways for his King to escape punishment, but he is not able to find them, and the game ends as many gambits end, successfully for the attacker.
internet, 2020
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+
4...Kxf7 5.Nxe5+ Nxe5 6.Qh5+ Ke6
7.Qf5+ Kd6 8.Nc3 Nh6
An interesting idea: attacking the Queen and leaving the f-file open for the Rook.
Recently, we have also seen 8...Qf6 9.d4 (9.Qh3 Qxf2+ 10.Kd1 Nf6 11.d3 Kc6 12.Bg5 d6 13.Qg3 Nfg4 14.Ne2 Qf7 15.d4 Nf2+ 16.Kd2 Nxe4+ 17.Kc1 Nxg3 18.hxg3 Qf2 19.Kd1 Bg4 20.Re1 Nc4 21.dxc5 Qd4+ 22.Kc1 Qxb2+ White resigned, noory - emranhamidm, FICS, 2020) 9...Qxf5 (9...Bxd4 10.Nb5+ Kc5 11.Nxd4 Kxd4 12.Be3+ Kc4 13.Qh5 Kb4 14.Qe2 Qc6 15.c3+ Ka4 16.b3+ Ka5 17.b4+ Ka4 18.Qd1+ Kb5 19.a4+ Kc4 20.Qd4+ Kb3 21.Rb1+ Kxa4 22.b5+ Qc4 23.Rb4+ Black resigned, NN - NN, lichess.org, 2020) 10.dxc5+ Kxc5 11.Be3+ Kc6 12.exf5 Nf6 13.O-O-O d5 14.Bd4 Re8 15.f3 Bxf5 16.b4 a6 17.a4 b5 18.Rhe1 Nc4 19.Rxe8 Rxe8 20.Bxf6 gxf6 21.Nxd5 Re2 22.Rd4 Rxc2+ 23.Kd1 Rd2+ 24.Rxd2 Nxd2 25.Ne7+ Kd7 26.Nxf5 Nc4 27.axb5 axb5 28.Nd4 c6 29.Ke2 Nd6 30.Nb3 Ke6 31.Kd3 Kd5 32.Nd2 Nc4 33.Ne4 Ne5+ 34.Kc3 f5 35.Nf6+ Ke6 36.Nxh7 Ng6 37.Ng5+ Kf6 38.Nh3 Ke5 39.g3 f4 40.Nxf4 Nxf4 41.gxf4+ Kxf4 42.Kd4 Kf5 43.Kc5 Kf4 44.Kxc6 Kxf3 45.Kxb5 Kg4 46.Kc6 Kh3 47.b5 Kxh2 48.b6 Kg3 49.b7 Kg4 50.b8=Q Kf5 51.Qb5+ Ke4 52.Qd5+ Kf4 53.Kc5 Ke3 54.Qd4+ Kf3 55.Kd5 Kg3 56.Qc3+ Kf4 57.Qd3 Kg4 58.Kd4 Kf4 59.Qe4+ Kg5 60.Qe5+ Kg6 61.Ke4 Kf7 62.Qf5+ White won on time, penguingim1 - sutcunuri, lichess.org, 2020)
9.Nb5+ Kc6 10.Qxe5 Kxb5
Black can capture the Knight, but it would be safer to play something like 10...d6 or 10...Qe7.
11.a4+ Kc6
Maybe now Black thinks he can get in ...d6, but it is too late for that. He needs another plan. He could have tried 11...Ka6 12.Qxc5 b6!? and his King can escape to b7.
12.Qd5+ Kb6 13.a5+ Kb5
Again, Black would have helped himself more with 13...Ka6, this time answering 14.Qxc5 with 14...d5 (14...b6 is not as effective) 15.b4 Qd7 16.0-0 and White has an edge, although a checkmate isn't available.
However, after the text, it is.
14.c4+ Kb4 15.O-O
Good enough.
You might want to work out the alternative: 15.b3 Qf6 16.Ba3+ Kxb3 17.Qd3+ Ka4 18.Bb2+ Kb4 19.Bc3+ Kb3 20.Bxf6+ Kb4 21.Qc3#.
15...c6
16.Qd3 Bxf2+ 17.Rxf2 d6 18.Qc3+ Kc5 19.d4 checkmate
