Alekhine's Defense: Four Pawns, Main Line

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 dxe5 6.fxe5 Nc6 7.Be3 Bf5 8.Nc3 e6 9.Nf3 Be7 10.Be2 O-O 11.O-O f6 12.exf6 Bxf6 13.Qd2