Ways to use the queen effectively

The Queen is the most powerful piece on the chess board because of its mobility and ability to move like the bishop and the rook. The Queen can assist in targeting long range and is most devastating when she comes in close range with the target. When the King is targeted from close range , then checkmating possibilities rise.
In the game which follows, it is interesting to see the way with which White moves his queen, starting on the queenside, then swinging onto the King side and finally getting close to the Black King to set up checkmate.

White: Rainer Knaak (2505) – Black: Lutz Espig (2425)
DSV-Turnier Berlin,1982
Queen Pawn Opening
1.d4 d6 2.c4 e5 3.Nf3 Nd7 4.Nc3 Be7 5.Qc2 c6
Black should have also given some thought to 5. ..dxc4
6.e3 Ngf6 7.Bd3 a6 . If 7...0–0 8.Bd2 Re8 9.0–0–0 Qc7 10.g4 Nf8 11.g5 Nh5 12.Rhg1 g6 13.Ne2 exd4 14.Nfxd4 Ne6 15.Nxe6 Bxe6 16.f4 Qc8 17.Rdf1‚ was played in a previous game and resulted in a victory for White 8.0–0 0–0 . Both have castled on the King side. If 8...b5 9.dxe5 Nxe5 10.Nxe5 dxe5 11.b3 Be6 12.Ne4 Nd7 13.Bb2 f5 14.Ng3 e4 15.Bxe4 fxe4 16.Qxe4 Kf7 17. Rad19.b3 Re8 10.Bb2 Bf8. Retreating to the back rank! But better would have been 10. 10. ..Qc7 or 10...h6. If 10...exd4 11.exd4 Nf8 12.h3 Ng6 will be slightly better for White.

11.Rad1 Qc7 12.h3. If 12.Ng5 g6 13.f4 Ng4 14.Rde1
12...b5.

He wants to start proceeding on the queen side and perhaps this advance appears a trifle hasty. Worth a look is 12. ..Be7 or  12...h6
13.Ng5

An interesting move! White decides to focus on the King side 13. ..g6. If 13...h6 14.Bh7+ is better for White  14.f4. With his queen, bishop and knight trained on the King side, white decides to probe furthur.

14. .. exd4 15.exd4 Bh6
If 15...bxc4 16.bxc4 Bg7 17.f5 with White having advantage and if 15...d5 16.f5
Diagram 1
16.Qf2.
Shifting to the King flank with the idea of playing Qh4
16...Nf8

This move looks questionable!. There are a few possibilities here which have to be considered like 16...bxc4 17.bxc4 d5 18.Qh4 Bg7 19.cxd5 cxd5 20.Nxd5 Nxd5 21.Qxh7+ Kf8 22.Nxf7 (22.Ba3+ Ne7) 22...N7f6 (22...Kxf7 23.Bxg6+) 23.Ba3+ Ne7 24.Qxg6
And if 16...d5 17.Qh4 Bg7 18.f5 (18.cxd5 cxd5 19.Nxd5 Nxd5 20.Qxh7+ Kf8)  
17.d5! bxc4
If 17...cxd5 18.Nxd5 (18.cxd5 and 18.cxb5 are better for White) 18...Nxd5 19.cxd5
18.Nce4
A good move! White wants to exchange the knight which is right now an important defensive piece
18. .. Nxe4
If 18...Bg7 19.Bxf6 cxd3 20.Bxg7 Kxg7 21.Qd4+ Kh6 22.Nf6
19.Nxe4 Bg7
If 19...Nd7 20.Qd4 f6 21.dxc6 Qxc6 (21...cxd3 22.cxd7) 22.Bxc4+
20.Bxg7 Kxg7
If 20...cxd3 21.Nf6+
21.Qd4+ Kh6
If 21...f6 22.Nxf6 with advantage for White
22.Nf6 Bxh3  More in desperation than anything else. If 22...cxd3 23.Ng8+ Kh5 24.Qg7 And if 22...Ne6 23.dxe6 cxd3 24.Ng4+ Kh5 25.Qg7
23.Ng8+ Kh5 24.Qg7 And Black resigned for if 24. ..Qb6+ 25.Kh2 and Black cannot avert checkmate
Diagram 2
White to play and win
1.Bxf6 Bxf6
If 1...gxh4 2.Rxg7+ Kf8 3.Rh7  
2.Qxh6 Bg7 3.Bh7+ Kf8 4.Qxg5 f6 5.Qf4  and White wins.

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