1...d6 is reasonable, and may transpose to the King's Indian Defense (e.g. after 2.Nf3 g6 3.c4 Bg7 4.Nc3 d6), Grünfeld Defence (e.g. after 2.Nf3 g6 3.c4 Bg7 4.Nc3 d5), Old Indian Defense (e.g. after 2.Nf3 Nbd7 3.c4 e5 4.Nc3 Be7), Pirc Defense (2.e4 Nf6 3.Nc3 g6), or even Philidor's Defense (e.g. 2.e4 Nf6 3.Nc3 Nbd7 4.Nf3 e5). The Wade Defence, a slightly offbeat but fully playable line, arises after 1...d6 2.Nf3 Bg4. Note that the plausible 2.c4 e5 3.dxe5?! dxe5 4.Qxd8+ Kxd8 scores less than 50% for White.