If you were looking for the 1997 film starring Nicolas Cage as John Travolta, please look again.
A Face-Off occurs when two pieces of different colors occupy the same square.
Play is taken to the second board, where a new game of Chess is started. This is known as the Face-Off Decider Game.
The winner of this game of Chess wins the Face-Off, and the losing piece must retreat to their previous occupied square.
If a Face-Off occurs during a Face-Off Decider, the process is repeated on the third board.
If a Face-Off occurs on the third board, each player is permitted to reach for their gun.