[UEFA CHAMPIONS LEAGUE] History is not on the side of Barcelona in its semifinal series with Chelsea in the UEFA Champions League. Only twice in nine series hasa team come back from a 1-0 loss in the first leg to go through to the final. And only four out of 23 times has a team lost the first leg of the semifinals and advanced. Here are three keys toTuesday’s second leg at the Nou Camp (TV: Fox Soccer, Fox Deportes, 2:30 pm ET) …

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