Every Russian Schoolboy Knows: Typical mistakes in early middlegame - Part 3

There's a number of ways your game can go wrong, and among them a very common one is the failure to connect the opening with the middlegame.
One of the most difficult tasks is to find a good square for your queen. Some balance between activity and safety has to be found. In Video #3 we can see examples of dire consequences when this issue isn't resolved correctly.