Football's ultimate rivalries -- in a book of two halves. Is the final score Celtic 100 Rangers 0? Or Rangers 100 Celtic 0?      Celtic Rangers. Rangers Celtic. The Old Firm. Detested opponents.      Celtic: The Lisbon Lions, the first British club to be European champions. Rangers: what's that you say? 1-0 Celtic.      King Kenny: the clue is in the name. And he was a Rangers fan! Mo Johnston: nah. 2-0 Celtic.      Celtic: Scottish Premier League champions. Rangers: couple of promotions to go, eh? 3-0 Celtic.      You get the picture. But there are two sides to every story.      Rangers: founded 1873. Celtic: 1888. That'll be 15 years later! 1-0 Rangers.      League champions? 54 beats 45, whichever way you turn it around. 2-0 Rangers.      Record transfer fee received - Celtic: £6.5 million for Stilian Petrov. Oops! Rangers: £9 million for Alan Hutton. Result! 3-0 Rangers.      You decide.