Why Did Anakin Lose Against Obi-Wan in Revenge of the Sith? Star Wars Explained

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. Why couldn’t he have beaten Kenobi?