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Jeffery Xiong vs Samuel Sevian
United States Championship (2021), St. Louis, MO USA, rd 3, Oct-08
Catalan Opening: Open Defense (E03)  ·  0-1



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Kibitzer's Corner
Oct-11-21  cormier: 1. d4 Notes by Stockfish 11 (minimum 30s/ply) 1... Nf6 2. c4 e6 3. g3 d5 4. Bg2 dc4 5. Qa4 Nbd7 6. Qc4 c5 7. Nf3 a6 8. Qb3 cd4 9. Nd4 Nc5 10. Qe3 Nd5 11. Qd2 Be7? 11...b5 12.Nc3 Bb7 13.O-O Rc8 14.Nxd5 Bxd5 15.Bxd5 Qxd5 = 0.00 (38 ply) 12. O-O ⩲ +0.78 (35 ply) 12... O-O 13. Rd1 Qb6 better is 13...Qc7 14.Nc3 Nf6 15.Qc2 Rd8 16.e4 e5 17.Nf5 Rxd1+ = +0.46 (37 ply) 14. Nc3 better is 14.Na3 a5 15.b3 Rd8 16.Nc4 Qa6 17.Ba3 b5 18.Nxa5 Bd7 ⩲ +1.01 (36 ply) 14... Nf6 better is 14...Rd8 15.Nxd5 exd5 16.Qc2 Bf6 17.Be3 Ne4 18.Rac1 Bd7 = +0.38 (39 ply) 15. Qe3? 15.Qc2 Rd8 16.Bf4 Bd7 17.e4 Be8 18.e5 Nfd7 19.Rac1 Rac8 ⩲ +0.96 (37 ply) 15... Rd8 = 0.00 (39 ply) 16. h3 Bd7 17. b3 Bf8 18. Bb2 better is 18.Ba3 Rac8 19.Nf3 Bc6 20.Ne5 Bxg2 21.Kxg2 Qc7 22.Rxd8 = +0.34 (36 ply) 18... Be8 = -0.19 (37 ply) after 18...a5 19.Rab1 h6 20.Ba3 Rdc8 21.Na4 Nxa4 22.bxa4 Bb4 19. Rac1 Rd7 better is 19...a5 20.Nc2 Bc6 21.Rxd8 Rxd8 22.Rd1 Rxd1+ 23.Nxd1 = -0.13 (35 ply) 20. Nb1? 20.Nc2 Rxd1+ 21.Nxd1 Bc6 22.Bd4 Bxg2 23.Kxg2 Nd5 24.Qf3 = +0.40 (36 ply) 20... Nd5 = -0.47 (39 ply) 21. Qf3 better is 21.Bxd5 Rxd5 22.Ba3 Rc8 23.b4 e5 24.bxc5 Qd8 25.Nc3 Rxd4 = 0.00 (39 ply) 21... Nb4 ⩱ -0.60 (37 ply) 22. Nc3 Rad8 23. Qe3 Rd6 better is 23...f6 24.a3 a5 25.axb4 axb4 26.Nb1 e5 27.Rd2 Na6 28.Nf3 ⩱ -0.51 (39 ply) 24. a3 = +0.24 (43 ply) 24... Nc6 25. Nc6 Rd1 26. Nd1 Bc6 27. b4 Bg2 28. Kg2 Na4 29. Qb6 Nb6 30. Ne3 Rd7 31. Nc4 Na4 32. Ne5 Rd2 33. Ba1? 33.Bc3 Rxe2 34.Nd7 f6 35.Bxf6 gxf6 36.Rc8 Kf7 37.Nxf8 = 0.00 (44 ply) 33... f6 ⩱ -1.25 (39 ply) 34. Nd3 e5 35. Kf1 Ra2 36. Bc3 Ra3 37. Bd2 Bd6 38. b5? 38.Nc5 Nxc5 39.bxc5 Bf8 40.Be3 Ra5 41.f4 exf4 42.gxf4 ⩱ -0.85 (37 ply) 38... ab5 -+ -2.98 (38 ply) 39. Rb1 e4 40. Nf4 Ra2 41. Be1 b4 better is 41...Rb2 42.Rxb2 Nxb2 43.Nd5 Nc4 44.f3 exf3 45.exf3 Kf7 -+ -4.02 (37 ply) 42. Nd5 ∓ -2.07 (40 ply) 42... Rb2 43. Rd1? 43.Rxb2 Nxb2 44.Bxb4 Bxb4 45.Nxb4 Kf7 46.Ke1 Ke6 47.Kd2 ∓ -2.02 (38 ply) 43... b5 -+ -6.46 (41 ply) 44. Rd4 b3 45. Nc3 Nc3 46.Bxc3 Rc2 47.Rd5 Rc1+ 48.Kg2 Rxc3 49.Rxb5 Ba3 50.Rb8+ -+ -17.75 (34 ply)
Oct-16-21  Ulhumbrus: After 8 Qb3 Black will be able to attack the white queen by ...Nc5 following the capture ...cxd4. Then the white queen is going to lose a lot of time moving from one square to another and that may enable Black to appropriate White's opening advantage. One alternative is 8 Qc2.
Sep-18-23  Saniyat24: Precision pressing by Sevian...! The black Queen being on b6 and Sevian's centralized position nullified the effect of the fianchettoed white bishops, black always had more targets to attack...a wonderful game of chess...!

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