Discovery

Black is to move.

What piece should be moved ...and to where?







Study it before reading further. For you non-chess players, the answer is Knight on e5 to f3, check. This opens a discovered attack on White's queen sitting on d4. White is forced to respond to the check by Black's knight and on the next move Black will take White's queen with his bishop sitting on g7, giving Black a sizable advantage.

This type of manouvre is called a "discovered attack".

But you already knew all that, didn't you?