How did Harry beat Voldemort in Goblet of Fire?

Question:

How did Harry beat Voldemort in Goblet of Fire?

Harry was years younger and facing one of, if not the, most powerful wizards of all time.
Granted, Voldemort was freshly "re-birthed", but he should still have been powerful enough to beat a 14 year old boy

Best Answer - Chosen by Asker: Priori incantatem, which is a special form of the prior incantato spell. When cast, prior incantato causes a wand to regurgitate ghostly images of the last spell it cast. Priori incantatem is slightly different. When two "sibling" wands (that is wands with the same core material from the same source, both Harry and Voldemort's wands have a feather from Fawkes the phoenix) are used in a duel against each other, one of the two will end up displaying the last several spells it was used to cast. Which of the two is determined by whose willpower is stronger at the moment.

Voldemort expected as he was the older, more knowledgeable wizard that he could easily beat Harry and kill him, but Harry was determined not to die so easily, thus his willpower was stronger than Voldemort's at that moment. Which meant the resulting priori incantatem was in Harry's favor. Because priori incantatem forced Voldemort's wand to reveal spells going back to the death of Harry's father. Harry didn't actually beat him. The ghosts of those Voldemort had killed with his wand distracted him long enough for Harry to escape.