Jose Raul Capablanca was a World Champion from Cuba, when he played Frank Marshall in a match early in his career everyone thought he would get crushed by the American but despite having not studied the game, and having many disadvantages, it was Jose who crushed Frank, here i give the 6th game in their match where Frank makes some basic mistakes strategically to lose to an attack on the King.
1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.c3 Bg4 5.d3 Be7 6.Nbd2 Nf6 7.0-0 0-0 8.Re1 h6 9.Nf1 Nh7 10.Ne3 Bh5 11.g4 Bg6 12.Nf5 h5? opening up the h file is not a good idea here.
13.h3 hxg4 14.hxg4 Bg5?! [14...a6 15.Ba4 b5 16.Bb3 Na5 17.Bc2 Rb8 18.Kg2 Nf6+/- ]
15.Nxg5 Nxg5 16.Kg2 d5 17.Qe2 Re8 18.Rh1 Re6 [18...Nh7 an attempt to get in f6 for the King to escape from the kingside doesnt work for example play may go like this:-(note-an immediate f6 is answered by Bxg5 opening lines to the King). 19.Qf3 dxe4 20.dxe4 f6 21.Bc4+ Kf8 22.b3 b6 23.Rxh7 Bxh7 24.Qh3 Bxf5 25.Ba3+ Nb4 26.Bxb4+ c5 27.Bxc5+ bxc5 28.Qh8+ Ke7 29.Qxg7+ Kd6 30.Rd1+ Kc6 31.Bd5+ Qxd5 32.exd5+ Kb6 33.Qxf6+ Ka5 34.Qxf5+- ]
19.Qe3 f6 20.Ba4 Ne7 21.Bb3 c6 22.Qg3 a5 23.a4 Nf7 24.Be3 b6 25.Rh4 Kf8 26.Rah1 Ng8 27.Qf3 Bxf5 28.gxf5 Rd6 29.Qh5 Ra7 30.Qg6 Nfh6 31.Rxh6!! gxh6 32.Bxh6+ Ke7 33.Qh7+ Ke8 34.Qxg8+ Kd7 35.Qh7+ Qe7 36.Bf8!! of course the Bishop cannot be taken by the Queen because the Black Queen is pinned to the King by the White Queen.
36...Qxh7 37.Rxh7+ Kc8 38.Rxa7 1-0