fifty-move rule in chess states that a player can claim a draw if no capture has been made and no pawn has been moved in the last fifty moves (“move” is consists of a player completing a turn followed by the opponent completing a turn). Purpose of this rule is to prevent a player with no chance of winning from continuing to play indefinitely or seeking win by tiring the opponent.
Learned this during the GPU Chess Hackathon in San Francisco
fifty-move rule is considered in Forsyth-Edwards Notation
Wikipedia Link: https://en.wikipedia.org/wiki/Fifty-move_rule