John, thanks for your reply! Your status as a pool player gives added weight to your opinion on this question. By the way, this thread started when Mike Haines posed the question to me about an "unknown Mosconi" in an email. I thought it was an interesting question and encouraged him to post it on AZ.
As has been pointed out by others in this thread, the chance that a "practice champion," who may play great in his basement, could snap off a big tournament is remote at best. Most of us know that doing well in tough tournaments or money matches takes BOTH physical skills AND mental toughness or seasoning and developing the mental side of this equation is unlikely (impossible?) with only solitary practice. As I said in an earlier post in this thread, the only way I can imagine an unknown popping up to win a big tournament, or a money match with you, would be if the unknown were, for some reason, immune to the pressures of tournament competition or gambling matches. And how could that happen? I suggested that it might happen if the unknown player had a mental disorder such as autism, where they were absolutely indifferent to the reactions and opinions of those around them. Imagine, if you will, a pool playing savant who spends his days running hundreds in the solitude of his basement game room. Perhaps like those known musical savants who, though subnormal in intelligence, have been known to play a musical selection flawlessly after hearing it once. So we have this imaginary "Rainman" pool player who might even have been exposed to Accu-Stat videos of championship pool and who is drawing their rock three rails to nail the perfect angle on their next shot and running hundreds. Granted, it is a VERY far fetched idea, but is it impossible? Well, that's the question, isn't it? And John, if I run across this "unknown Mosconi," I'll let you be the test case. If he can beat you a few games of straight pool, we will go in together and make a fortune with this guy!