The most direct approach. White wants to make the most of his lead in development and needs open files.
1. g1f3  1... g8f6  2. c2c4  2... e7e6  3. g2g3  3... d7d5  4. f1g2  4... d5d4 One of the popular ways of meeting the Reti these days. Black enters a reversed Benoni, down a couple of tempi. 5. e1g1  5... b8c6 