Like a general in a battlefield who knows all about warfare but not in how to handle a bayonet—and who perhaps has never used it—I am perhaps the wrong person to give advice. But I’m of the thought that the best trainers are not the ones who have done it—done the job they’re training others to do—but who have seen other people do it. The guy from the mountain sees better than the one on the turf below.

I remember the days when people used to call me Bobby Fisher, partly bec...