This is one of the main lines of the Catalan Opening. The next move is a small surprise, as it is much less common than taking the knight on f6.
1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. c2c4  3... e7e6  4. g2g3  4... f8e7  5. f1g2  5... e8g8  6. e1g1  6... d5c4  7. d1c2  7... a7a6  8. a2a4  8... c8d7  9. c2c4  9... d7c6  10. c1g5  10... b8d7  11. b1c3 