1.e4
c5
2.d4
cxd4
3.c3
Nf6
4.e5
The pawn on e5 is key to what follows. By forcing the Nf6 from its defense of the kingside, white gains space and the opportunity to force further kingside weaknesses.
4...Nd5
5.Nf3
e6
6.Bc4
Nb6
7.Bb3
d6
8.cxd4
To make sure that a white pawn remains on e5
8...Nc6
9.Qe2
overprotecting e5
9...dxe5
10.dxe5
It is becoming clear that black has a bad light-squared bishop and that white has an obvious space advantage in the center
10...Bb4+
11.Nc3
Nd5
12.Bd2
Nxc3
13.bxc3
Be7
14.0-0
0-0
Sure seems safe to 0-0 kingside, right?
15.Rfd1
Threatening discovered attacks down the d-file
15...Qc7
16.Qe4
b6
Diagram Trying to develop the light squared bishop
17.Bc2
The obvious threat is Qxh7#
17...g6
Every pawn move creates a weakness... here the dark squares around the black king (f6 and h6) have been compromised
18.Bg5
Offering to trade white's "bad" bishop for black's good one.
18...Bb7
[18...Bxg5
19.Nxg5
with the threat of Qh4, f4, and Ne4-f6]
19.Bf6
Hunkering down, taking command over the dark squares on the kingside
19...Rfd8
[19...Bxf6
20.exf6
With Qh4 to follow]
20.Qh4
Bf8
Gladly offering the Rd8 to relieve the dark-squared pressure.
21.Ba4
With the idea of Bxc6, Nd4, and Rd3-h3
21...Rdc8
22.Rd3
Ne7
23.Nd4
Nf5
Diagram Do you see the finale?
24.Nxf5
exf5
25.Rh3
h6
26.Qxh6!
[26.Qxh6
Bxh6
27.Rxh6
There's no way to prevent Rh8#] 1-0