4...Nc6
5.Na4 Nc6 6.Ne2 Be6 7.d3 Qe7 8.O-O d5 9.Nxc5 Qxc5 10.Be3 Qd6 11.exd5 Bxd5 12.Nc3 Bxg2 13.Kxg2 Nd5 14.Qd2
14.Qf3
14...O-O
Black ought to castle Queenside with 14...O-O-O in order to attack on the King's wing.
15.Ne4 Nxe3
15...Qg6 16.f4 f5 17.Nc3 ( or 17.Nc5 Nxe3 18.Qxe3 Nd4) 17...Rad8 would have created interesting complications, which would probably have turned out in Black's favour.
16.Qxe3 Qd4 17.c3 Qxe3 18.fxe3
1/2 - 1/2