Black's dark squares near his K are compromised due to the absence of the defender - the dark-squared B.  Black is trying his best to build some barriers - having the Pf6 and with his last move getting the N on defense as well.

However, White found an elegant way via small but devastating tactics - 23.Bg5! undermining the Ne5.  Black's position fell apart.  He chose 23...Nd7 offering the P on f6, but White wanted more 24.Rxd7!  (It is also fine if you prefer a risk free 24.Nxf6+ or 24.Bxf6.  Black's dark squares are extremely week and White should have no problem converting his positional and material advantage.  Practice against a friend or a computer)  24...Bxd7 25.Nxf6+ Kf7 26.Qc4+ Be6 27.Qh4 with a super dangerous attack.

Here are the remaining moves:  27...Rh8 28.Ne4 Qf8 29.Qf4+ Bf5 30.Qc7+ Ke6 31.Qc4+ Kd7 32.Qd5+ Kc7 33.Bf4+ Kb6 34.Nd6 Black resigned 1-0

Once again, the position of the Black K is somewhat compromised, but at least his defender, the dark-squared B, is still present. Not only it defends the K, but it also pressures White's Q-side, specifically the Pb2. White found a nice little tactics at his disposal that forced Black to trade his prized B for its White counterpart.

After 1.Bh6! Qxh6 19.Qxe5 Qg7 20.Qd6, White gained a solid positional advantage due to a better pieces and safer K.

White is completely dominating here.  The shortest way to finish the game is to strike against the defender of the Ne5.

After 32.Bxg5 Black resigned.

Once again we see the Be5 as a key defender and, once again, White can eliminate it and regain the P in the process.  After 22.Bh6! Qxh6 23.Qxe5+ Qg7 24.Qxc5, White is better because of better pieces (compare the Bishops) and the weak Black K.

The game continued 24...Re8 25.Rd1 Qxb2 26.Bf7 Qe5 27.Qa3 Re7 28.Rd7 Qe1+ 29.Kh2 Qe5+ 30.g3 Qe1 31.Qb2+ Re5 1-0