Big city othello

London regional this weekend, and I've been playing online a bit to see if practice helps me or hinders me. I can't quite understand my othello-playing ability. Some days I have a run of great games where I spot all the clever little moves and plan ingenious strategies far in advance, other times (and against the same opponents in the same positions) I find that I have no idea what's going on and I just make really stupid moves. Possibly there's some kind of loose connection in my brain. I need some kind of brain scan. Actually, there is some kind of neurologist or something who wants to talk to me, maybe I'll get round to emailing him back and have him check my wiring...