Editing Threefold repetition (section)

===1972 World Championship===
The [[World Chess Championship 1972#Game 17|seventeenth]]<ref>{{cite web|url=http://www.chessgames.com/perl/chessgame?gid=1044731 |title=Spassky vs. Fischer, 17th game, 1972 |publisher=Chessgames.com |access-date=2020-07-03}}</ref> and [[World Chess Championship 1972#Game 18|eighteenth]]<ref>{{cite web|url=http://www.chessgames.com/perl/chessgame?gid=1044371 |title=Fischer vs. Spassky, 18th game, 1972 |publisher=Chessgames.com |access-date=2020-07-03}}</ref> game of the [[world chess championship 1972|1972 World Championship match]] in Reykjavik between [[Bobby Fischer]] and [[Boris Spassky]] were declared draws because of threefold repetition. The [[World Chess Championship 1972#Game 20|twentieth]] game was drawn after an incorrect claim (see [[#Incorrect claims|incorrect claims]] below).