El ajedrez es un juego entre dos personas, cada una de las cuales dispone de 16 piezas móviles que se colocan sobre un tablero dividido en 64 escaques. En su versión de competición está considerado como un deporte. Originalmente inventado como un juego para personas, a partir de la creación de computadoras y programas comerciales de ajedrez, una partida de ajedrez puede ser jugada también por una persona contra un programa de ajedrez o por dos programas de ajedrez entre sí. Se juega sobre un tablero cuadriculado de 8×8 casillas (llamadas escaques), alternadas en colores blanco y negro, que constituyen las 64 posibles posiciones de las piezas para el desarrollo del juego. Al principio del juego cada jugador tiene dieciséis piezas: un rey, una dama, dos alfiles, dos caballos, dos torres y ocho peones. Se trata de un juego de estrategia en el que el objetivo es «derrocar» al rey del oponente. Esto se hace amenazando la casilla que ocupa el rey con alguna de las piezas propias sin que el otro jugador pueda proteger a su rey interponiendo una pieza entre su rey y la pieza que lo amenaza, mover su rey a un escaque libre o capturar a la pieza que lo está amenazando, lo que trae como resultado el jaque mate y el fin de la partida. Este juego, tal como se conoce actualmente, surgió en Europa durante el siglo XV, como evolución del juego persa shatranj, que a su vez surgió a partir del más antiguo chaturanga, que se practicaba en la India en el siglo VI. La tradición de organizar competiciones de ajedrez empezó en el siglo XVI. El primer campeonato oficial del mundo de ajedrez se organizó en 1886. El ajedrez está considerado por el Comité Olímpico Internacional como un deporte, y las competiciones internacionales están reguladas por la FIDE. Los jugadores compiten a nivel individual en diferentes torneos, aunque también existen competiciones por equipos, siendo una de las más importantes las Olimpíadas de ajedrez.

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Chess is a two-player strategy board game played on a chessboard, a checkered gameboard with 64 squares arranged in an eight-by-eight grid. Chess is played by millions of people worldwide, both amateurs and professionals. Each player begins the game with 16 pieces: one king, one queen, two rooks, two knights, two bishops, and eight pawns. Each of the six piece types differently. The most powerful piece is the queen and the least powerful piece is the pawn. The objective is to 'checkmate' the opponent's king by placing it under an inescapable threat of capture. To this end, a player's pieces are used to attack and capture the opponent's pieces, while supporting their own. In addition to checkmate, the game can be won by voluntary resignation by the opponent, which typically occurs when too much material is lost, or if checkmate appears unavoidable. A game may also result in a draw in several ways. Chess is believed to have originated in India, some time before the 7th century, being derived from the Indian game of chaturanga. Chaturanga is also the likely ancestor of the Eastern strategy games xiangqi, janggi and shogi. The pieces took on their current powers in Spain in the late 15th century; the rules were finally standardized in the 19th century. The first generally recognized World Chess Champion, Wilhelm Steinitz, claimed his title in 1886. Since 1948, the World Championship has been controlled by FIDE, the game's international governing body; the current World Champion is the Norwegian Magnus Carlsen. FIDE also organizes the Women's World Championship, the World Junior Championship, the World Senior Championship, the Blitz and Rapid World Championships and the Chess Olympiad, a popular competition among teams from different nations. There is also a Correspondence Chess World Championship and a World Computer Chess Championship. Online chess has opened amateur and professional competition to a wide and varied group of players. There are also many chess variants, with different rules, different pieces, and different boards. FIDE awards titles to skilled players, the highest of which is grandmaster. Many national chess organizations also have a title system. However, these are not recognised by FIDE. The term "master" may refer to a formal title or may be used more loosely for any skilled player. Until recently, chess was a recognized sport of the International Olympic Committee; some national sporting bodies such as the Spanish Consejo Superior de Deportes also recognize chess as a sport. Chess was included in the 2006 and 2010 Asian Games. Since the second half of the 20th century, computers have been programmed to play chess with increasing success, to the point where the strongest home computers play chess at a higher level than the best human players. Since the 1990s, computer analysis has contributed significantly to chess theory, particularly in the endgame. The computer IBM Deep Blue was the first machine to overcome a reigning World Chess Champion in a match when it defeated Garry Kasparov in 1997. The rise of strong computer programs (known as "engines") that can be run on hand-held devices has led to increasing concerns about cheating during tournaments.

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