Standings after 4 rounds
| 1. | Nakamura, Hikaru | gm | USA | 2793 | * | ½ | . | ½ | . | . | . | ½ | 1 | . | 2½ | |
| 2. | Vachier-Lagrave, Maxime | gm | FRA | 2765 | ½ | * | . | ½ | . | . | ½ | . | . | 1 | 2½ | |
| 3. | Giri, Anish | gm | NED | 2778 | . | . | * | ½ | ½ | ½ | . | . | . | 1 | 2½ | |
| 4. | Grischuk, Alexander | gm | RUS | 2750 | ½ | ½ | ½ | * | . | . | . | . | . | ½ | 2 | |
| 5. | Adams, Michael | gm | ENG | 2744 | . | . | ½ | . | * | ½ | ½ | . | ½ | . | 2 | |
| 6. | Aronian, Levon | gm | ARM | 2781 | . | . | ½ | . | ½ | * | . | ½ | ½ | . | 2 | |
| 7. | Carlsen, Magnus | gm | NOR | 2850 | . | ½ | . | . | ½ | . | * | ½ | ½ | . | 2 | |
| 8. | Caruana, Fabiano | gm | USA | 2787 | ½ | . | . | . | . | ½ | ½ | * | . | ½ | 2 | |
| 9. | Anand, Vishy | gm | IND | 2803 | 0 | . | . | . | ½ | ½ | ½ | . | * | . | 1½ | |
| 10. | Topalov, Veselin | gm | BUL | 2803 | . | 0 | 0 | ½ | . | . | . | ½ | . | * | 1 |
In this 4th round in the game Carlsen-Adams, the first move made for Carlsen by the young girl was 1. Nc3, but then they changed the move to 1.Nf3. Is this possible?