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It didn't win 5 times in a row without defeat. It won 3 times, lost, and then won again.

I don't agree with the premise of the article but the 5-0 results refer to Fan Hui's match ("Europe’s top Go player").

The article describes the outcome of Lee Sedol's match correctly:

> Lee went on to lose all but one of their match’s five games.

It wasn't written very clearly, I had to reread that paragraph a few times before understanding what you just explained.