Andreikin expands on the kingside. His main idea is to remove the  black knight from the defense of the central outpost.
1. e2e4  1... c7c5  2. b1c3  2... d7d6  3. g1e2  3... g8f6  4. h2h3  4... e7e5  5. d2d3  5... b8c6 