Du 7 au 17 Mai se déroule l'U.S. Chess Championships au Chess Club and Scholastic Center de Saint Louis. Tournoi en 9 rondes avec 24 participants : Kamsky, Nakamura, Onischuk, Shulman, Christiansen, Becerra, Akobian, Kaidanov, Benjamin, Ehlvest, Gulko, Ibragimov, Khachiyan, Shabalov, Friedel, Hess, Robson, Sevillano, Zatonskih, Krush, Shankland, Brooks, Lawton et Hughes.
Site officiel : http://saintlouischessclub.org/US-Championship-2009
Résultats de la ronde 9
| 1. | IM | Robert Hess | (6) | 2545 | ½-½ | GM | Varuzhan Akobian | (5½) | 2664 |
| 2. | GM | Hikaru Nakamura | (6) | 2757 | 1-0 | GM | Joshua Friedel | (5) | 2568 |
| 3. | GM | Alexander Onischuk | (5½) | 2736 | 1-0 | IM | Ray Robson | (4½) | 2542 |
| 4. | GM | Jaan Ehlvest | (4) | 2649 | ½-½ | GM | Gata Kamsky | (5½) | 2798 |
| 5. | GM | Yury Shulman | (4½) | 2697 | ½-½ | GM | Gregory Kaidanov | (4) | 2662 |
| 6. | IM | Enrico Sevillano | (4) | 2549 | 0-1 | GM | Larry Christiansen | (4) | 2681 |
| 7. | GM | Joel Benjamin | (4) | 2650 | ½-½ | GM | Alexander Shabalov | (4) | 2620 |
| 8. | GM | Ildar Ibragimov | (4) | 2628 | 1-0 | IM | Michael Brooks | (4) | 2419 |
| 9. | IM | Samuel Shankland | (3) | 2464 | 0-1 | GM | Boris Gulko | (3½) | 2631 |
| 10. | GM | Julio Becerra | (3½) | 2672 | ½-½ | GM | Melikset Khachiyan | (2½) | 2632 |
| 11. | | Tyler Hughes | (3) | 2293 | 1-0 | FM | Doug Eckert | (2) | 2278 |
| 12. | IM | Irina Krush | (3) | 2496 | ½-½ | | Charles Lawton | (½) | 2350 |
Résultats de la ronde 8
| 1. | GM | Gata Kamsky | (5) | 2798 | ½-½ | GM | Alexander Onischuk | (5) | 2736 |
| 2. | IM | Robert Hess | (5) | 2545 | 1-0 | GM | Yury Shulman | (4½) | 2697 |
| 3. | IM | Michael Brooks | (4) | 2419 | 0-1 | GM | Hikaru Nakamura | (5) | 2757 |
| 4. | GM | Varuzhan Akobian | (4½) | 2664 | 1-0 | GM | Joel Benjamin | (4) | 2650 |
| 5. | GM | Joshua Friedel | (4) | 2568 | 1-0 | GM | Jaan Ehlvest | (4) | 2649 |
| 6. | IM | Ray Robson | (3½) | 2542 | 1-0 | IM | Enrico Sevillano | (4) | 2549 |
| 7. | GM | Gregory Kaidanov | (3½) | 2662 | ½-½ | GM | Ildar Ibragimov | (3½) | 2628 |
| 8. | GM | Larry Christiansen | (3) | 2681 | 1-0 | | Tyler Hughes | (3) | 2293 |
| 9. | GM | Boris Gulko | (3) | 2631 | ½-½ | GM | Julio Becerra | (3) | 2672 |
| 10. | GM | Alexander Shabalov | (3) | 2620 | 1-0 | IM | Irina Krush | (3) | 2496 |
| 11. | GM | Melikset Khachiyan | (2½) | 2632 | 0-1 | FM | Doug Eckert | (1) | 2278 |
| 12. | | Charles Lawton | (0) | 2350 | ½-½ | IM | Samuel Shankland | (2½) | 2464 |
Résultats de la ronde 7
| 1. | GM | Yury Shulman | (4½) | 2697 | 0-1 | GM | Alexander Onischuk | (4) | 2736 |
| 2. | GM | Hikaru Nakamura | (4) | 2757 | 1-0 | GM | Varuzhan Akobian | (4½) | 2664 |
| 3. | GM | Joel Benjamin | (4) | 2650 | 0-1 | GM | Gata Kamsky | (4) | 2798 |
| 4. | GM | Joshua Friedel | (4) | 2568 | 0-1 | IM | Robert Hess | (4) | 2545 |
| 5. | IM | Enrico Sevillano | (3) | 2549 | 1-0 | GM | Gregory Kaidanov | (3½) | 2662 |
| 6. | IM | Ray Robson | (3½) | 2542 | 0-1 | IM | Michael Brooks | (3) | 2419 |
| 7. | GM | Jaan Ehlvest | (3) | 2649 | 1-0 | IM | Irina Krush | (3) | 2496 |
| 8. | GM | Ildar Ibragimov | (2½) | 2628 | 1-0 | GM | Melikset Khachiyan | (2½) | 2632 |
| 9. | GM | Boris Gulko | (2½) | 2631 | ½-½ | GM | Alexander Shabalov | (2½) | 2620 |
| 10. | IM | Samuel Shankland | 2½) | 2464 | 0-1 | | Tyler Hughes | (2) | 2293 |
| 11. | FM | Doug Eckert | (1) | 2278 | 0-1 | GM | Larry Christiansen | (2) | 2681 |
| 12. | GM | Julio Becerra | (2) | 2672 | 1-0 | | Charles Lawton | (0) | 2350 |
Résultats de la ronde 6
| 1. | GM | Varuzhan Akobian | (4) | 2664 | ½-½ | GM | Yury Shulman | (4) | 2697 |
| 2. | GM | Gata Kamsky | (3½) | 2798 | ½-½ | IM | Robert Hess | (3½) | 2545 |
| 3. | GM | Alexander Onischuk | (3½) | 2736 | ½-½ | GM | Hikaru Nakamura | (3½) | 2757 |
| 4. | IM | Michael Brooks | (3) | 2419 | 0-1 | GM | Joshua Friedel | (3) | 2568 |
| 5. | GM | Melikset Khachiyan | (2½) | 2632 | 0-1 | GM | Joel Benjamin | (3) | 2650 |
| 6. | GM | Gregory Kaidanov | (2½) | 2662 | 1-0 | IM | Samuel Shankland | (2½) | 2464 |
| 7. | IM | Enrico Sevillano | (2½) | 2549 | ½-½ | GM | Jaan Ehlvest | (2½) | 2649 |
| 8. | GM | Larry Christiansen | (2) | 2681 | 0-1 | IM | Ray Robson | (2½) | 2542 |
| 9. | IM | Irina Krush | (2) | 2496 | - | GM | Julio Becerra | (2) | 2672 |
| 10. | | Tyler Hughes | (2) | 2293 | 0-1 | GM | Ildar Ibragimov | (1½) | 2628 |
| 11. | GM | Alexander Shabalov | (1½) | 2620 | 1-0 | FM | Doug Eckert | (1) | 2278 |
| 12. | | Charles Lawton | (0) | 2350 | 0-1 | GM | Boris Gulko | (1½) | 2631 |
Résultats de la ronde 5
| 1. | GM | Hikaru Nakamura | (3) | 2757 | ½-½ | GM | Gata Kamsky | (3) | 2798 |
| 2. | GM | Joshua Friedel | (3) | 2757 | 0-1 | GM | Yury Shulman | (3) | 2697 |
| 3. | GM | Jaan Ehlvest | (2½) | 2649 | 0-1 | GM | Varuzhan Akobian | (3) | 2664 |
| 4. | IM | Samuel Shankland | (2½) | 2464 | 0-1 | GM | Alexander Onischuk | (2½) | 2736 |
| 5. | IM | Robert Hess | (2½) | 2545 | 1-0 | GM | Melikset Khachiyan | (2½) | 2632 |
| 6. | GM | Julio Becerra | (2) | 2672 | 0-1 | IM | Michael Brooks | (2) | 2419 |
| 7. | IM | Ray Robson | (2) | 2542 | ½-½ | GM | Gregory Kaidanov | (2) | 2662 |
| 8. | GM | Joel Benjamin | (2) | 2650 | 1-0 | | Tyler Hughes | (2) | 2293 |
| 9. | IM | Irina Krush | (1½) | 2496 | ½-½ | GM | Larry Christiansen | (1½) | 2681 |
| 10. | GM | Alexander Shabalov | (1½) | 2620 | 0-1 | IM | Enrico Sevillano | (1½) | 2549 |
| 11. | GM | Ildar Ibragimov | (1) | 2628 | ½-½ | GM | Boris Gulko | (1) | 2631 |
| 12. | FM | Doug Eckert | (0) | 2278 | 1-0 | | Charles Lawton | (0) | 2350 |
