Chess Opening Theory/1. d4/1...Nf6/2. c4/2...g6/3. Nc3/3...d5/4. cxd5/4...Nxd5/5. e4/5...Nxc3/6. bxc3/6...Bg7/7. Bc4/7...c5

7...c5
This pawn lever also tries to attack the center. Since the center is potentially opening, white is well advised to move his king out of danger with 8.Ne2 followed by O-O.