1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... d5c4  5. f1g2  5... c7c6 The game begins as a Catalan opening, but now we have a transposition to a line that often occurs in the Semi-Slav move order where White sacrifices the pawn on c4. This leads to extremely complicated and risky positions. 6. e1g1  6... b7b5  7. a2a4  7... c8b7  8. f3e5  8... a7a6  9. b2b3  9... c4b3  10. d1b3  10... d8d4  11. c1b2  11... d4b4  12. b3c2  12... b4c5 