After the opening moves 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.a3 Nc6 5.Nf3, Tim Harding in his book The Fighting Fajarowicz gives 5...a5?! as dubious following 6.Qc2! d5 7.exd6 Nxd6 8.Nc3! which is "marvelous for White," according to Joel Benjamin and Eric Schiller in their book Unorthodox Openings. Harding adds, "I think they are right. Obviously 8...Nxc4? loses to 9.Qe4+...."
But it does not lose!
What everyone has overlooked is that 9...Be6 10.Ng5 Nd6 11.Nxe6 (better 11.Qc2=) works out to Black's advantage after 11...Nxe4 12.Nxd8 Rxd8! 13.Nxe4 Nd4!! when Black will win the exchange by 14.Kd2 Nb3+ 15.Kc3 Nxa1 16.Bf4 Rd1.