Historically 12.Nd2 is the main move, but it has lost some popularity recently.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g2g3  3... c7c5 Taking the game into the Benoni Defense is more fun and risky than the normal Catalan Opening lines resulting from 3...d5. 4. d4d5  4... e6d5  5. c4d5  5... d7d6  6. b1c3  6... g7g6  7. f1g2  7... f8g7  8. g1f3  8... e8g8  9. e1g1  9... f8e8 The main position of the Benoni Defense with g3.