1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... f8c5  5. c2c3  5... e8g8  6. e1g1  6... d7d6  7. f1e1  7... a7a5  8. c1g5 In a must-win situation, Carlsen chooses a risky line. 8... h7h6  9. g5h4  9... g7g5 This is why the early bishop sortie is risky: it may  end up being locked out of the game for a long time. 10. h4g3  10... c5b6  11. b1a3  11... f6h7  12. a3c2 The knight is above all supporting the d3-d4 push, although  it might as well be easily transferred to the f5 (d5)-square. 12... h6h5 