>For "Brain Ring" I have this picture of a man, strapped to a chair, in a large circular room, with an electronic gizmo around his head, wires coming out of it, lights flashing, strange synthesised sounds playing, the man's gritting his teeth, his face a stricture of agony as he tries to resist having his brain drained. Did I watch too many cold war movies when I was younger?:-)

May be. I guessed when you posted that message it was the picture you had in mind, but this game name is associated mostly with a boxer's match, a match between brains.