Focal Point

The focal point is the square upon which a player focuses an attack such as repeatedly attacking that square or sacrificing a piece there. For example, in an attack upon an uncastled king, Black's f7-square or White's f2-square is a common focal point. Examples of attacks on the focal point f7 include the Fried Liver Attack initiated by a knight sacrifice on f7 and the primitive Scholar's Mate ending with checkmate on f7.

In the following puzzles, find the best improving (direct or  indirect) focal point for Black to play and not neccessarily win.