Will Chelsea beat Barcelona?

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Really is difficult to believe in a Chelsea's won versus the all-powerful Barcelona. But, it's not a game lost from the beginning. The first leg will be played in Stamford Bridge and, to have any possibility, Chelsea have to win this match, because in Camp Nou, it's almost impossible to beat Barcelona. So, the first step for Chelsea is win the first leg at home, because they'll surely suffer to achieve a good result. If they don't win that match, they will be definitely eliminated before the second leg match. What is your opinion? How do you think Chelsea could do to beat Barcelona?