context: 1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. c1f4  3... e7e6  4. e2e3  4... c7c5  5. f1e2 5.c3 was played in the sixth game of the match. 5.Nbd2 is very popular. 5... f8d6  6. d4c5  6... d6c5  7. c2c4  7... e8g8  8. e1g1  8... b8c6  9. b1c3 The opening transposed into a position that normally occurs in the move order of the Queen's Gambit Declined. 9... d5c4  10. e2c4  10... f6h5 The fifth most-popular move in this position, only played in a handful of games. Black prepares to capture the bishop, taking advantage of the fact that White didn't have time to play the prophylactic h2-h3. 11. f4g5 A natural continuation, but White has other attempts. 11... c5e7  12. c3e4  12... h5f6 