Divisibility rule

Mariya Muzychuk – Harika Dronavalli
Women’s Grand Prix; 4th stage; 成都 (Chéngdū), July 5, 2016
Sicilian Defence B33

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Be7 10. Bxf6 Bxf6 11. c4 b4 12. Nc2 0-0 13. g3 a5. For 13. ... Bg5 14. Bg2 Qa5 15. 0-0 Qc5 16. Qd3 Be6 see A. Muzychuk – Fressinet, 4th Trophée Anatoly Karpov, Cap d’Agde 2015. 14. h4 a4 15. b3. Most likely White can better fight for an advantage by playing 15. Qd2 followed by Nc2-e3. 15. ... Be6 16. Nxf6+. For 16. Rb1 axb3 17. axb3 Bxd5 18. cxd5 Na5 19. Bh3 Qb6 20. Qd2 Rfb8 21. 0-0 Ra7 22. Rfc1 Rc7 see Nakamura – Radjabov, Renova Grand Prix Series 2012/2013, third stage, Zug 2013. The text doesn’t show anything but a draw wish. 16. ... Qxf6 17. Bg2 Qd8 18. 0-0 Qb6 19. Qd3 Qc5 20. Rfd1 Rfd8 21. Rd2 axb3 22. axb3 Rxa1+ 23. Nxa1 Qd4 24. Nc2 Qxd3 25. Rxd3 Kf8 26. Rd1 Na5 27. Nxb4 Rb8 28. Nc2 Rxb3 29. Rxd6 Nxc4 30. Rd1 Rb2 31. Ne1 f6 ½-½ “Despite playing with Black, I got into an equal position at the opening itself. I saw an opportunity and started pressing but slowly it started fizzling out and I had to accept the draw”, Harika finally said.

Mariya Muzychuk
Photo: qipai.org.cn

Harika Dronavalli’s grandmother (first from left)
Photo: qipai.org.cn