It seems there's much left to discover, even in such heavily studied openings like the Ruy Lopez. There are not many games in this position, and in a couple of moves, the game will leave theoretical territory.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. d2d3  5... f8c5 