I'm pretty sure that was it, actually. He wanted to be captured so that Anakin would rescue him (I forget how he knew it was going to be Anakin) and fight with Count Dooku. He promised Dooku that if Anakin gained the upper hand, he would interfere, but his real plan was, of course, to get Dooku out of the way if Anakin was more powerful.
A typical EU explanation trying to rectify bad writing.