Wang Yue (2700) might be the most resilient advocate of the Berlin Wall and his approach is almost exclusively Be7-Nh4. The merits of this approach is that it trades the knights bringing black closer to the holy grail of a bishop ending but in the process it also allows f2-f4 for white. Then there is for example the Nf5-Ne7-Ng6, trying to prevent white from queenside expansion. The drawback of course is that it takes time.

As someone who is at the very beginning of the Berlin learning curve I would like to know what people opinion is of Wang Yue's approach compared to others and whether you have a preference for either. As a bonus question I am interested to learn how black responds to an early Bg5 (e.g. 9.Nc3 Ke8 10.h3 Be7 11.Bg5).