Chess Opening Theory/1. e4/1...c5/2. Nf3/2...d6/3. d4/3...cxd4/4. Nxd4/4...Nf6/5. Nc3/5...g6/6. f4

The idea of this sneaky move is to setup a tactic that wins a knight if black's not careful.

Main Line - 6...Nbd7
The best move and the refutation. Black develops the other knight and supports the other knight.

The Trap - 6...Bg7?? 7. e5!
If black goes for the normal dragon theme, they lose a tempo with. e5! as the move 6. f4, in fact prepared e5.