comment: White's pieces are somewhat cramped, and it's difficult to prepare castling. This is a nice way to gain space and give some life to the a-rook.
context: 1. e2e4 1.e4 is usually a good move, even if the position is not what we're used to. 1... e7e5  2. f2f3 A bit timid. 2... f7f5  3. h1g3  3... f5f4  4. g3e2 Black managed to gain space and should be fine, but I never know what to expect in the first moves of these random positions. That's exactly why I'm such a big fan of this form of chess. 4... c7c6  5. d2d4  5... g7g5 This is slow. It would have been better to develop the knight immediately.