Maybe Muzychuk was surprised by Wagner's opening choice. The text move is not the most accurate.
1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. c4d5  4... f6d5  5. e2e4  5... d5c3  6. b2c3  6... f8g7  7. g1f3  7... c7c5  8. f1b5  8... b8c6  9. e1g1  9... e8g8  10. d4d5 This advance is just the third most popular move. 10.Be3 and 10.Bxc6 are played in roughly equal measure.