Creating a retreat route for the bishop.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... d7d5  4. c4d5  4... e6d5  5. c1g5  5... f8b4 Another recent opening trend, spicing the game a bit compared to the more solid 5...Be7. 6. e2e3  6... h7h6  7. g5f4 A rare move that has been played by Keymer before. 7... c8f5  8. f1d3  8... f5d3  9. d1d3  9... c7c6 Carlsen improves Black's play compared to the earlier Keymer game. 10. g1e2  10... f6h5 [%c_effect h5;square;h5;type;GreatFind;persistent;true] 11. f4e5  11... b8d7 