In a blitz game like this one, pinning the knight is always interesting. For a classical time control, however, 6...Bd7 or 6...b5 are preferable.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... f8c5 One of the many possible sidelines of the Ruy Lopez. 5. e1g1  5... d7d6  6. c2c3 