Back To Square One
Meaning back to the beginning this idiom was first heard on football radio commentaries during games.Football isn't easy to commentate on on the radio so they had the idea of splitting up the field into notional numbered squares so that listeners could be told where the ball was. Whenever the game restarted after a break it was 'back to square one'.



(来源：英语交友 http://friends.englishcn.com)