Find the Powerful Move #1
Most puzzles ask you to find a tactical answer. Some (like my previous tests) ask you to find a positional move or a strategic idea. The idea behind this series will be for the reader to find a move that is 1) powerful and 2) cannot be classified as just a tactic, or positional idea, or strategic idea. It's going to be all those things - which is why the move is so "powerful"! After it, the game is swung decisively in one player's direction.
I will be using my games from the recently concluded Chicago Open and St Louis Invitational (the latter I won 7.0/9, finishing in sole first place and netting my second IM-norm).