[Harry Potter Official Club] How Did Dumbledore Beat the Unbeatable Wand?

Has anyone considered how Albus Dumbledore was able to defeat Gellert Grindelwald when Gellert had the Elder Wand, which was supposedly unbeatable? When they met in "King's Cross" after Voldemort hit Harry with the Killing Curse, Dumbledore told him only "I won the duel. I won the wand."

 

I think there's a fairly obvious answer but I'm curious to hear if there are some other theories first.

 

John

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