An interesting move, much less played than 11.Nb3.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... d5c4  5. f1g2  5... c7c5  6. e1g1  6... b8c6  7. d4c5 A solid choice for White, leading to a risk-free endgame with a minimal advantage. 7... d8d1  8. f1d1  8... f8c5  9. b1d2  9... c4c3 Before giving the pawn back, Black spoils White's pawn structure a little bit. All this is already well-established by opening theory. 10. b2c3  10... e8g8 