With White having won the only game with the dreaded Berlin Defence (1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6) in the Carlsen – Anand match (and surprisingly Magnus Carlsen was White in this one) it could be that we’ll be seeing 1.e4, and the Ruy Lopez, making a comeback. If this happens then I’d recommend something a bit livelier for Black than clomping around in a Berlin endgame, that arises after 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 (Carlsen played 4.d3) 4…Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Nf5 8.Qxd8+ Kxd8. Yawn.
A much livelier alternative is the Moller Defence, which goes 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Bc5. Black develops his pieces on natural squares and has excellent chances to take the initiative in the middle game.
I did a video on the Moller in the 1990s. It was the one I did the most research for, finding some obscure games and analysis of Alexander Alekhine (a Moller exponent in his day) and then taking his conclusions a step further by supplementing them with modern games.
The Moller video is now at my Tiger Chess site, together with a pgn download to make it easier to learn. Here’s a video about how you can learn the Moller in a very effective way: