Is this the biggest blunder in checkers history?

Marion Tinsley is regarded as the greatest checkers player of all time, and he played nearly perfectly in every single one of his games. However, in Game 1 of the 1958 World Championship Match against Derek Oldbury, he made perhaps one of the biggest blunders of all time. I provide some context around the match, so you can decide if you believe it's one of the biggest mistakes in the history of the game. I highly recommend checking out ZoeZap Software's CheckerPlayer program. It has a great interface and I've been enjoying some of its unique features. it's free to download, which you can do so at the following site: https://zoezap.com/checkerplayer/ Sources: The American Checker Federation Bulletin, issue No. 270, "Marion Tinsley - The Inside Story" By RLF-Part 16 "America's Best Checkers," Marion Tinsley and Walter Hellman photos The Sanford News-Herald, Saturday, July 17, 1976, "City hosts record-breaking National Checkers Tourney." Derek Oldbury photo by Jimmy Haire