FryLock and Indistinguishable: agreed, and like I said, I’d originally changed my mind about posting, but only too late. Good some interesting points came out of it. I’ll think twice next time:)
Yeah. The big problem is collapsing the superpositions in such a way as to (with bounded probability of error) pick out the best move from among them, rather than just any old move from among them. (That’s the main roadblock for most applications of quantum computing; e.g., it’s why we still don’t know if quantum computers are any good at solving NP-complete problems)
ETA: Er, that in reply to Chronos. But you can read it too. 