White: Me (2125)
Black: Opponent (1679)
1.f3 d5 2.Kf2
Activating the king.
2...c5 3.e3 Nc6 4.d3 e5 5.c3 Nf6 6.Ne2 Be7 7.h3 0-0 8.Nd2 b5 9.b3 a5 10.a3 Qc7 11.g3
I like to call this the I-play-like-I'm-on-drugs variation. Black has no moves that can break through the great white wall...save for maybe a4, b4, c4, d4, e4, Nd7-f5-f4, g5-g4, or h5-h4. But other than that, the wall is completely impenetrable.
11...Bf5 12.e4 dxe4 13.dxe4 Be6 14.g4 Rad8 15.Ng3 Qb6 16.Kg2 g6 17.h4 c4
17...b4 was better, forcing white to give up their defence of the d4 outpost. However, 17...c4 gives black an excellent opportunity to make a dubious sacrifice which they otherwise would not have been able to do.
18.bxc4 Nxe4 19.fxe4 f5 20.gxf5 gxf5 21.exf5 bxc4 22.Bxc4 Bxc4 23.Qg4+ Kh8 24.Nxc4
White is slightly better in this position due to a space advantage and a more active king.
24...Qc5 25.Bg5 Rd3 26.Rhd1 Rxc3 27.Rac1 Rxc1 28.Rxc1 Rd8 29.Qe4 Bxg5 30.hxg5 Rd4 31.Qf3
White is so confident in their position and chess skills that they feel they do not need the extra piece to win.
31...Rxc4 32.Rxc4 Qxc4 33.f6 Kg8 34.Qh5 Nd4
Here it was probably in black's best interest to not let white mate them.
If only black activated their king early on like white did, this would never have happened...