1. d4 Nf6 2. c4

The ♕ueen's Gambit Opening.

2... e6
3. Nf3 d5

Gaining more influence in the center.

4. Nc3 Bb4

Creating the threat of ...♘e4.♔osintseva is playing the ♖agozin Defense.

5.Bg5
The most popular continuation for White in my database, pinning the knight.

5...O-O

A less known variation is chosen by ♔osintseva.

6. a3

Forcing ♔osintseva to decide what to do with her bishop.

6... Bxc3+

The most popular continuation, saving a tempo.

7. bxc3 Nbd7

Developing a piece and allowing her to recapture on f6 with this knight if Chen plays ♗xf6 at some point.

8. e3

♙rotecting her c-pawn and allowing her to develop her bishop.

8...c5

♔osintseva creates further tension in the center of the board.

9. cxd5

The only move White plays in this position in my database, reducing some of the central tension.

9... exd5

10. Qa4

Forcing ♔osintseva to keep her rook on a8 to defend her a-pawn.

10... Qb6

Giving more support to her c-pawn.

Developing her last minor piece.

11...c4 N

Forcing the White bishop to eventually move and closing the center.This move may be a theoretical novelty .The move 11... Qb2 is the only move I found in my database and it was played by Ristic vrs Cabrilo.

12. Rb1

Gaining a tempo to take the place
of the one she will lose when she moves her attacked bishop. (Analysis:Shredder 8 gave a better evaluation to the move 12.♗f5: 12. Bf5 Qb213. O-O Qxc3 14. Rfc1 Nb6 15. Qd1 Qb2 16. Bxc8 Rfxc8 17. Bxf6 gxf6 And White has compensation for the pawn.)
Returning to the moves played in the game:

12... Qe6

The lost tempo.

13. Bc2

(Analysis:Shredder 8 preferred to capture on f6: 13. Bxf6 cxd3 14. Be5 Qg6 15. O-O Nb6 16. Qb4 Bg4 17. Nd2 Rfe8 )

13... Ne4

Aggressively posting the
knight where it attacks the undefended White pawn on c3.

14. Qb4?1

Tieing down the ♗lack bishop to the defense of the ♗lack b-pawn.Shredder 8, Junior 9 and Hiarcs 8 both gave poor evaluations to this move. ( Analysis:Shredder 8: 14. Bxe4 dxe4 15. Nd2 Qg6 16. h4 (16. Qa5 h6 17. Bf4 Qxg2 18. Rf1 Re8 19. h4 Nf6 20. Be5 Qg6 21. Bxf6 Qxf6 22. Qa4 Re7 23. Nxc4 Bg4 ) 16... h6 17. Bf4 (Hiarcs 8: 17. Be7 Re8 18. Bc5 Qxg2 19. Rf1 Nf6 20. Qxc4 Qh2 ) 17... Qxg2 18. Rf1 Nf6 ) (Analysis:Junior 9: 14. Bf4 Qg4 15. Kf1 Ndf6 16. Qb4 Re8 17. h3 Qf5 18. Kg1 Qh5 19. Be5 Bf5 =) Returning to the moves played in the game:

14... Qg4 Creating a double-attack against the White bishop and attacking the White g-pawn simultaneously.

(Analysis:Shredder 8:♙referred to play 15.♗f4: 15. Bf4 Qxg2 16. Bxe4 dxe4 17. Nh4 Qh3 18. Bg3 Nb6 19. Rg1 Re8 )

15...Qxg2

Winning a pawn and a tempo.

16. Ke2
The lost tempo.

16...a5

Winning another tempo. (Analysis:Shredder 8: 16... Qh3 17. Rbg1 Re8 18. Bg3 a5 19. Qb2 Qh5 20. Bc7 Ra6) Returning to the moves played in the game:

17. Qb2

The lost tempo.

17... Ra6

Intending ...♖b6.

(Analysis:Hiarcs 8: 17... Qh3 18. Rbg1 b5 19. Bg3 Qh5)

For her next move in the game Chen played:

18. Rbg1

Winning a tempo. (Analysis:Shredder 8: 18. Rhg1 Qh3 19. Bg3 Qh5 20. Bf4 Ndf6 21. h3 Bxh3 22. Rh1 Qg4 23. Rbg1 Bg2 24. Rxg2 Qxg2 25. Rh2 Qg4 )

Kosintseva,for her next move in the game played:

18... Qh3
The lost tempo.

19. Bd1

(Analysis: (a)Shredder 8: 19. Bg5 Qh5 20. Rg2 Ndf6 21. h3 Bg4 22. hxg4 Qxh1 23. Rg1 Qh3 24. Bxf6 Rxf6 25. Bxe4 dxe4 26. Ne5 Rb8 ) ((b)Hiarcs 8: 19. Bg3 Qh5 20. Bh4 Rb6 21. Qa1 Ndf6 22. h3 Bf5 23. a4 Nxf2 24. Kxf2 Bxc2 25. Bxf6 Rxf6 26. Rg3 Be4 27. Qd1 Qh4 )

Winning a tempo.

20. Qc2

The lost tempo.

20...Rb3

Creating the threats of ...♖xa3, ♖xc3 and ....♘xc3.

21.Ke1 Rxc3

Winning another pawn and a tempo. (Analysis:Shredder 8: 21... Rxa3 22. Qb2 Rxc3 23. Bg3 Rd3 24. Qa1 Ndf6 25. Ne5 b6 )

Play in the game now continued:

22. Qb2 Rd3
23. Bg3?

( Analysis:♗etter was 23. Be2 Rb3 24. Qc1 Nc3 25. Nd2 Nxe2 26. Kxe2 Qxh4 27.Nxb3 cxb3 28. Qc3 Nf6 )

Kosintseva now played:

23... Rxd1+!

24. Kxd1 Qh5

Attacking the knight.

25. Ke2

(Analysis:Hiarcs 8: 25. Ke1 Qxf3 26. Qe2 Qxe2+ 27. Kxe2 Nxg3+ 28. hxg3 b5 )

25... Ng5

Double-attacking and winning the White knight.

26.Bd6 Qxf3+ 0-1