Fishing Pole (chess)

The Fishing Pole is a chess opening trap most common in the Ruy Lopez (especially in the Berlin Defence and Exchange Variations), however, the trap can be used in any opening or in the middle of the game. Its broadest definition is a move that sacrifices a knight or bishop on the g-file to open up the h-file, after the opponent has short castled and before the player deploying the trap, usually Black, has short castled.