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Xiong, Jeffery (2674) - So, Wesley (2822) [E05]
U.S. Chess Championship, Saint Louis (9) 2017

Notes by Boris Schipkov

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3








   
5...O-O
The Catalan Opening.
6. O-O dxc4 7. Qc2 a6 8. a4 Bd7 9. Rd1 Bc6 10. Nc3 Bxf3 11. Bxf3 Nc6 12. Bxc6 bxc6








   
13. Bg5
In the game Laznicka, V - Nakamura, H, Baku 2016 White played 13. a5 Rb8 14. Ra4 Rb4 15. Na2 Rxa4 16. Qxa4=, with equality.
13...Rb8 14. e3 c5
14...a5 is also playable, 15. Bxf6 Bxf6 16. Rac1 Rb4 17. Na2 Rb6 18. Rd2 Qb8 19. Qxc4 Rxb2 20. Rxb2 Qxb2=, with equality in Leko, P - Ponomariov, R, Dortmund 2010. 14...Nd5?! is worse, 15. Bxe7 Qxe7 16. Ne4 a5 17. Nd2 c5 18. Nxc4 cxd4 19. Rxd4 Qc5 20. Rc1, with a small edge to White in Xiong, J - Harmon Vellotti, L, Saint Louis 2016
15. dxc5
15. d5 is also possible.
15...Qe8 16. Rd4








   
16...Nd7!?
An interesting novelty. Black can continue too 16...Rb4 17. Na2 (17. Ne2) 17...Qxa4 (17...Rxa4=) 18. Nxb4 Qxa1+ 19. Kg2 Qa5?! (19...c3) 20. Nc6 Qxc5 21. Nxe7+?! (21. Rxc4 Qxg5 22. Nxe7+ Kh8 23. Rxc7 h6) 21...Qxe7 22. Rxc4 c5 23. Bxf6 Qxf6 24. Rxc5 g6 25. b4 Qe7 26. Qd1 1/2, a draw in Sjugirov, S - Smirnov, P, Novosibirsk 2012
17. Bxe7 Qxe7 18. c6?
A mistake. 18. f4= is better to control the e5-square, with equality.
18...Ne5! 19. Qe4 Qc5! 20. Nd5 Nd3 21. Nxc7 Nxf2!
An excellent sacrifice.









   
22. Kxf2?
An error. 22. Nxa6 is better, and after 22...Qg5! 23. Kxf2 (23. Qf3 Rxb2) 23...Rxb2+ 24. Ke1 Rxh2 25. Qf3 Rh1+ (25...Qa5+) 26. Qxh1 Qxe3+ 27. Kf1 Qxd4 28. Re1 Qb6 (28...Qd3+ 29. Kf2) 29. Qh5 Qxc6 30. Nb4 Qd6 31. Na2 Qa3 (31...Qxg3 32. Qe5) 32. Re2 h6 33. Kg2 Qxa4 Black has a small advantage in the endgame.
22...Rxb2+ 23. Kf1 Qh5 24. Qg4 Qxh2 25. Qf3 c3!
Black activates the passed pawn.
26. Rc1 e5! 27. Rh4
Or 27. Rc4 Rfb8 28. Nd5 Rf2+! 29. Qxf2 Qh1+ 30. Qg1 Qxd5 31. R4xc3 Rb2 32. e4 (32. c7 Qf3+ 33. Ke1 Qe2#) 32...Qd2 33. R3c2 Rxc2 34. Rxc2 Qd1+ 35. Kg2 Qxc2+ 36. Kf3 Qxc6, and Black has two extra pawn in the queen endgame and wins.
27...Qd2 28. Rd1








   
28...Rd8!!
Wesley So sacrifices the queen!
29. Nd5
In the case of 29. Rxd2 Rdxd2 30. Kg1 Rb1+ 31. Qf1 Rxf1+ 32. Kxf1 c2 33. Rc4 Rd1+ 34. Ke2 c1=Q 35. Rxc1 Rxc1 36. Nxa6 Rxc6 Black wins.
29...Rxd5 30. Rd4 Rxd4 31. exd4








   
31...Qxd1+!
Again the beautiful move! After 31...Qxd1+ 32. Qxd1 c2 33. Qe1 Rb1 Black wins the white queen and the game.
White resigned. 0-1










Move
   

Xiong, Jeffery (2674) - So, Wesley (2822) [E05]
U.S. Chess Championship/Saint Louis (9) 2017

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O dxc4 7. Qc2 a6 8. a4 Bd7 9. Rd1 Bc6 10. Nc3 Bxf3 11. Bxf3 Nc6 12. Bxc6 bxc6 13. Bg5 Rb8 14. e3 c5 15. dxc5 Qe8 16. Rd4 Nd7 17. Bxe7 Qxe7 18. c6 Ne5 19. Qe4 Qc5 20. Nd5 Nd3 21. Nxc7 Nxf2 22. Kxf2 Rxb2+ 23. Kf1 Qh5 24. Qg4 Qxh2 25. Qf3 c3 26. Rc1 e5 27. Rh4 Qd2 28. Rd1 Rd8 29. Nd5 Rxd5 30. Rd4 Rxd4 31. exd4 Qxd1+ 0-1


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© 2017 Boris Schipkov