Philidor Defense: Exchange Variation

1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 Be7 6.Bf4 O-O 7.Qd2 Nc6 8.O-O-O Nxd4 9.Qxd4 Be6