This has been done here
i have the comic of the movie, and obi wan seems better then griveous, he´s cutting all his lighsabres, when he breaks them all, he stops, then griveous take that chance and pick in another weapon trowing obi´s lighsabre away, then they start to fight, obi doesn´t have any weapon so he picks griveous gun and kills him.
im sick of the whole "obi beat maul" thing....yes he killed him, but this was after a lucky shot. maul won the fight, he just got too cocky. maul is a million times better than obi in TPM, and probly AOTC if he were still alive, but the storyline wouldnt have it,and obi got lucky. hes not the most powerful, and obi in ROTS culd more than likely destroy him ,im just sayin that he's always underestimated.
Maul was cocky because his master said he would be no match for the Jedi, but with Sidious' foresight powers, he had to know Maul would lose. Besides, he needed someone like Dooku anyway.
Obi-Wan is not lucky, he's resourceful, he just happened to know the saber of Qui-Gonn's was still there and Maul's overconfidence did him in.