"There are many good features to this variation(1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.exd6). If Black recaptures 5..cxd6, White has good control of key squares such as d5 and e5 and has an excellent file for his Rook on e1. On 5..exd6, White's spatial advantages remain and Black has fewer opportunities for counterplay" - Soltis. Here you're given the strategy and analysis to win in both variations.