Sacrifice as a means to pin down the king

Chess Checks

. Lack of development or a slight lapse in defence invite such sacrifices and thereafter the King has to scurry for cover against the onslaught.

The game below is a delight to go through, as it involves a King hunt after White sacrifices a knight early to rip through the King side defence. Thereafter Black is totally pushed on the defensive and has no say whatsoever in the game other than defending his King.
White: Petr Kiriakov (2554) – Black: Sergey Tiviakov (2611)
Monarch Assurance,  Port Erin, 1999
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 Bxc5 6.Nf3 Qb6 7.e3 Qc7 8.b3 b6
Both players want to fianchetto their bishops on the queen side.
9.Bb2 Bb7 10.Be2
White can also play 10.Rd1 Be7
11.Rd1
Immediately coming onto the open file. If 11.h3 Be7 12.0–0 d6 13.Nd4 Nbd7 leads to an equal position
11...Be7 12.0–0 0–0
Both players castled but Black could have tried  12...d6 13.Ng5 Nbd7 14.Rd2 0–0 15.Nce4
13.Ng5
The knight goes into the enemy territory
13. ..Rd8
A big mistake!
If 13...Rc8 14.Nd5 exd5 15.Bxf6 Bxf6 16.Qxh7+ Kf8 17.cxd5 d6  18.Bh5! Bxg5 also does nothing for Black
14.Nd5
A thrilling knight sacrifice!

Diagram 1

14. ..exd5 15.Bxf6 Bxf6 16.Qxh7+
The purpose of the knight sacrifice by White was to get rid of the main defender of Black, the knight.
16. ..Kf8 17.cxd5
White’s idea is to play 18.d6 followed by 19.Qh8 checkmate
17...d6
If 17...Be5 18.f4 Qc5 19.fxe5 Qxe3+ 20.Kh1 Qxg5 21.Qh8+ Ke7 22.d6+ Ke6 23.Qh3+ Kxe5 24.Qc3+ Ke6 (24...Ke4 25.Qd4 checkmate) 25.Bc4And if 17...Qd6 18.Ne4 Qe5 19.Qh8+ Ke7 20.d6+ Ke6 21.Qh3+ Qf5 22.Bc4+ Ke5 23.f4+ Kxe4 24.Qf3 also ends in checkmate
18.Bh5 Bxg5
If 18...Rd719.Ne6+ fxe6 20.Qh8+ Ke7 21.Qe8 checkmate and if  18...g6 19.Ne6+
19.Qh8+ Ke7 20.Qxg7 Rf8
He has no choice but to give up the bishop
21.Qxg5+ Ke8
If  21...Kd7 22.Rd4 and Black loses
22.Rc1 Qd8
Black is desperate to have the queens exchanged and get some relief from the continuous attack. Though White has sacrificed a knight, he has plenty of compensation in the form of three pawns and a dynamic position.
23.Qf5  Qe7
Better appears 23...Nd7 24.Qe6+ Qe7 25.Rc7 Qxe6  26.dxe6 Nc5 27.b4 Kd8 28.Rxf7
24.Rc4
White continues to pile up the misery on black.
24...Nd7
If 24...Kd8 25.Re4 Qd7 (25...Bc8 26.Qxc8+ Kxc8 27.Rxe7; 25...Qc7 26.Qf6+) 26.Qf6+ Kc7 27.Rc1+
25.Rc7
A devastating infiltration of the seventh rank by the rook
25...Bc8
If 25...Rb8 26.Bg4 Bc8 27.Rfc1 Kd8  28.Qc2
26.Rfc1
There is nothing that Black can do now
26. ..Kd8
If 26...Qd8 27.Qe6+ Qe7 28.Rxc8+ Rxc8 29.Rxc8 checkmate
27.Bg4
If 27.Qc2 Qe5 28.Rxc8+ Rxc8 29.Qxc8+ Ke7 30.Qxa6 Qxh5 31.Qc4 and things are not so clear-cut for White
27...Qe8 28.R1c6
Black is cramped and helpless!
28...Rg8 29.h3 29...b5 30.Qf4 Qf8
If 30...Qe7 31.Rxd6 Kxc7  32.Rxd7+ Kb6 33.Qc7 checkmate and if 30...Qe5 31.Qxf7 Rg7 32.Qe6
31.Bxd7 Bxd7 32.Qf6+ Ke8
If 32...Qe7 33.Rxd7+ Kxd7 34.Rc7+ Kxc7 35.Qxe7+
33.Rxd6 Rd8 34.Rdxd7 and Black resigned as 34...Rxd7 35.Rc8+ loses.

Diagram 2

Black to play and win
1.  ..Qc4  2.Rd3 h6  3.Nd6 Ng4+  4.Kg3 Rxd3+ 5.cxd3 Qxd3+ and Black wins.