Useless Information Podcast Episode #84 - The Honest Man with an Evil Eye
"Few if any games of chess took as long as the one between Hugh P Harrison and his aunt Annie Patton, who lived 20 miles or 32 kilometres apart from each other in England.
That game was played by sending their moves back and forth through the mail for 20 years.
It ended in 1940 when Mrs Patton died. The game was left unfinished, so... let's just call it a draw"