Chess variants include odds chess, chess with additional pieces or pieces removed, and chess games with varying time limits. Many other variants with alternate rules can be found on chess websites.
Odds chess provides a way for unevenly matched players to play a fairer game of chess. The stronger player receives a handicap of some type. This can vary from very minimal, such as the weaker player going first, to extreme rules, such as the stronger player removing all his queen-side pieces. Other rules can be added, such as the stronger player must deliver mate with a certain piece or on a certain square. Chess can also be played with an alternate number of pieces.
Los Alamos chess is played on a six- by six-square board, and the bishops are removed. This variant was invented for play on the earliest computers; they did not have the computing power to play a full game. Capablanca Chess, which is played on a 10 by eight or 10 by 10 board, is a variant with additional pieces; an archbishop has the combined moves of a bishop and a knight, and a chancellor has the combined moves of a rook and a knight. Orthodox chess can also be varied by playing at different time limits, such as blitz chess where each player only has five minutes per game.