Why did Anakin lose against Obi-Wan in Revenge of the Sith?

In Star Wars Revenge of the Sith, Anakin and Obi-Wan's duel left some questions unanswered as to how Anakin lost so easily. After Order 66 he was extremely powerful with the dark side. The killing of Younglings and separatists is what pushed him to the edge, unlocking his new powers. read more

Because while he is every bit as good a fencer as Obi-Wan (better, even), Anakin is nowhere near as good as he imagines himself to be. Other than Anakin’s growth in the Dark Side, Obi-Wan knows everything about him. read more

If you read the book Revenge of the Sith, Obi-wan actually mistimes a block and accidentally takes off Anakin's limbs. Not taking anything away from Kenobi, he's one of my favorite jedis of all time, possibly favorite, but he won because of his fault. read more