Masterful with Obi-Wan
I've tested this several times and basically when you're duelling Grieouvs and Anakin you can get Masterful quite easily. It works best when you're at the last section of the duel and you just keep on double tapping the circle button. The only thing that they do is block it, which is good because you'll get to Masterful easily.
More tricks, tips and cheats for this game are right here - Star Wars: Episode III Revenge of the sith cheats
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