Chess tournament The three main types of time controls used in chess tournaments are "blitz", "standard", and "compensation". In blitz chess (also known as "sudden death" chess) each player starts with a fixed amount of time to spend on their moves of the game. The FIDE Handbook designates the following common blitz time controls: Blitz time controls increase the odds that one would "lose on time", meaning a forfeiture of the game due to the expiration of one's chess clock. Blitz tournaments are often documented with the notation "G/5" or "G/15", meaning "game in 5" and "game in 15", respectively. Standard time
Chess and is provably less than 10, with a game-tree complexity of approximately 10. The game-tree complexity of chess was first calculated by Claude Shannon as 10, a number known as the Shannon number. Typically an average position has thirty to forty possible moves, but there may be as few as zero (in the case of checkmate or stalemate) or (in a constructed position) as many as 218. Chess has inspired many combinatorial puzzles, such as the knight's tour and the eight queens puzzle. The idea of creating a chess-playing machine dates to the 18th century; around 1769, the chess-playing automaton