The only way to justify the early sortie of the white queen. If the knights are traded, White would enjoy a nice space advantage and easy play along the half-open e-file. However
1. e2e4  1... c7c5  2. d2d4  2... c5d4  3. d1d4 A Center Game against the Sicilian $2 Not a common one $1 3... b8c6  4. d4d3  4... g7g6 After a tempo gain, Carlsen decided to opt for a Dragon setup. This is one of the many ways to achieve a good position out of the opening. 5. b1c3  5... f8g7  6. g1f3  6... g8f6  7. f1e2  7... e8g8  8. e1g1  8... d7d6 