Chess is a board game and mental sport for 2 players. Chess is not a game of chance; it is based solely on tactics and strategy. Nevertheless, the game is so complex that not even the best players can consider all contingencies: although only 64 squares and 32 pieces are on the board, the number of possible games that can be played far exceeds the number of atoms in the universe. Chess is one of the world’s most popular games; it has been described not only as a game, but also as an art, science, and sport.