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.