Day 84 / 281 to go

Today I got a bit further with my opening variation with Black. In addition I did use Aagard´s book to practise my positional understanding, using my PAT (with the usual 6 positions in roughly one hour). I did score pretty well, but failed the following one (White to move):

Unfortunately, I didn´t even consider the correct move at all. Although I would say that it should be a rather easy one to grasp...  8-/      Can you get it?