typo.
I meant 21 races to 5 in my first post....
I fixed it.
When two players play there is a smidgeon of difference between them....so small that we call it a coin flip....because either player can win....in one set....because their playing ability difference is so small. BUT.....when they play several sets.....that smidgeon shows up....revealing that a 'coin flip', that we use to describe the set, is not actually true. There is a difference....that may not show up in one set....but will if they play enough sets.