Shimrra Jamaane vs. ROTS Obi-1 and ROTS Anakin
Well, The Supreme Overlord against The Chosen One and his master. Obi-1 and Anakin may work well as a team but Shimrra is the absolute top of Yuuzhan Vong combat mastery. It will be difficult fighting against two jedi but i'm guessing he is used to difficult fights. After all those tatoos and scars on his body are obvious proof of his skills.
I say that Shimrra can take them. It would not be easy for him but in the end he will be the victorious one.