Checkers, known internationally as draughts, is a strategy game with simpler rules than games such as chess. From a starting position, each player attempts to capture all the opponent's pieces by jumping them with their own. In many variants, pieces may only move forward until they reach the final rank, at which point they are promoted to king and may move and capture backwards.

Checkers is considered a solved game, with an AI named Chinook being undefeatable in the game. Whether playing first or second, it can guarantee no worse than a draw, and will win the game if the opponent makes an error. The system was developed from 1989 to 2007 by researchers at the University of Alberta, led by Jonathan Schaeffer.

Symmetry (n.): It adds up.