The longest game in the history of chess! Full Analysis! 269 moves!!
The longest tournament chess game (in terms of moves) ever to be played was Nikolić-Arsović, Belgrade 1989, which lasted for 269 moves and took 20 hours and 15 minutes to complete a drawngame. At the time this game was played, FIDE had modified the fifty-move rule to allow 100 moves to be played without a piece being captured in a rook and bishop versus rook endgame, the situation in Nikolić versus Arsović. FIDE has since rescinded that modification to the rule.