The gap is huge...but at the same time small....
It only takes one miss to lose the table. Just one. Never more. Never less.
Don't miss.
The guy I trained understands this. We play "social games". I'll look at the table and say "don't miss" and he knows if he does it's over. He knows what I mean...don't play safe either. Just don't miss. Usually I am just playing sociable with him, but when I say that, he knows it's on and I am teaching and he is about to get a lesson...on one shot.
Strategy, safeties, etc...it always comes down to shot making. Even a "bad roll" will not matter if you make the next shot.
The gap? It's really only one shot. The one you missed. Learn to make that shot. Every time.
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I played golf one time with a guy who played about the same as I did. Low single digit handicap. I think I was a 4.6 and he was a 2.7 or something.
He had played with a lot of pro players including major championship players. He had the best description of playing with a pro I've ever heard.
"It's crazy. They hit the ball a little farther and straighter off the tee. Their approach shots are a little better and they make a few more putts than you do. But it adds up to 12 strokes a round."
I think it's the same way with top shortstops/minor pros and the elite. When I watch Shane play a good or even great regional player he doesn't do anything they can't do. He just makes that kick safe more often. Makes a ball and gets shape on the 1 from the break a few more times. Gets out of line a little less. Plays slightly better patterns. Misses less. And when he comes upon a difficult shot that is a 'must make' he makes it a little more often.
And it adds up to 4-6 games a set.
When you can play shape and make all the shots, the difference is in how well you do the little things. And making fewer mistakes. He spends more time practicing his break than most players spend practicing. And it shows.