GM Lars Schandorff presents the main ideas in the very complex endgame of the Berlin Defence. He also explains why it has been nicknamed the Berlin Wall. The video also covers the basic theoretical knowledge of the Anti-Berlin (4.d3) and the old main line 4.0-0 Bc5.
Below you can have a closer look at the variations presented in the video by replaying the moves on the board. You can also introduce your own moves and analyse them with the help of the engine.