1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... d5c4  5. f1g2  5... a7a6 This is one of the most aggressive options against the ultra-solid Catalan Opening. Black intends to protect the c4-pawn with b7-b5. 6. e1g1  6... b8c6  7. b1c3  7... a8b8  8. e2e4  8... f8e7  9. d4d5 It's clear that both players are well prepared with the latest developments of this opening line since all these moves were played very quickly. 9... e6d5  10. e4d5  10... c6b4  11. f3e5  11... c8f5  12. e5c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] The most accurate move order. 12... e8g8 [%c_effect g8;square;g8;type;GreatFind;persistent;true] Black must resist the temptation to gain material. 13. a2a3  13... b4d3  14. c1e3  14... d8d7  15. b2b4  15... f8e8 This is a popular position in correspondence chess. 16. h2h3 [%c_effect h3;square;h3;type;Interesting;persistent;true] 16... b7b5 The first new move, and it's safe to say that both players are out of book by now. The move works, but it demands accurate play, and it's not the best practical choice. 17. c4a5  17... e7d6 [%c_effect d6;square;d6;type;Inaccuracy;persistent;true] 18. e3d4  18... d3b2  19. d1b3  19... b2a4  20. a5c6 Now White has a clear advantage. The knight on c6 is a monster. 20... b8a8  21. c3a4  21... b5a4  22. b3b2  22... d6f8 [%c_effect f8;square;f8;type;Mistake;persistent;true] 23. d4f6  23... g7f6  24. g1h2  24... f8g7  25. a1d1  25... f5g6  26. b2a2 It's not clear to me whether this is the best square for the queen, but it probably doesn't make much of a difference. 26... d7d6  27. f1e1  27... g6h5  28. d1b1  28... h5g6  29. b1d1  29... g6h5  30. d1c1  30... g7h6  31. f2f4 [%c_effect f4;square;f4;type;Mistake;persistent;true] This is a tactical mistake. 31... h5g6 [%c_effect g6;square;g6;type;Mistake;persistent;true] 32. a2c4 White is much better again. 32... h6f8  33. g2f3  33... g6f5  34. c6d4  34... e8e1  35. c1e1  35... f5d7  36. d4c6  36... g8g7  37. h3h4  37... g7g8  38. h2g2  38... g8g7  39. c4c2 The a4-pawn is doomed. 39... a8e8  40. e1e8  40... d7e8 