Turton doubling refers to a strategic move employed in chess, involving the sequential movement of two pieces along a line, such as a rank, file, or diagonal. The first piece advances along the line, followed by another piece, which occupies the same line ahead of the first. Finally, the second piece retraces its path along the line, moving in the opposite direction to the first piece. This maneuver, known primarily in the realm of chess problems, can also occur in actual games, particularly when White retreats the bishop on d3 to clear the way for the queen to threaten checkmate on h7, or when Black executes a similar tactic.
Although the direction of the piece movement may differ, the Turton doubling maneuver bears striking resemblance to the Zepler doubling we have previously discussed in our articles.