Where to find Tactical Exercises on the Decoy A decoy tactic is forcing an enemy piece to move to a square that prevents it from guarding an original square.

For example, if the black queen is at c7 and the f7 square is being attacked, getting the queen to move to c6 would be a successful decoy tactic.

Where can I find such puzzles?
The paid version of chesstempo allows you to search the problem database for all kinds of tactical motifs. Depending on your exact definition of "decoy tactic", you should look for what they call "attraction", "distraction", "clearance", "coercion", "sacrifice" and perhaps more.