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 