a) First instinct would be not to. I have no idea how good the unknown is, and even if I knew, I don't know if he's gonna dump the mach on purpose and split my money later w/ the 2 best players in the club... too many unknown factor to jump into a mid stakes game.
b) I'm not sure how this double format works
Its one shot each (like mosconi cup format)? Or 1 rack each? Or 1 inning each?
So you play single against unknown/weak local team? In that case, I'll snap-accept.
A team overall skill is almost equal to the weaker player skill( playing 1 shot each). However, i think I'm missing something here...cause this appears to be too easy.
c) 9ball. As opposed to 8ball, this game always has longer/shots and requires a good stroke by default, even if strategically is not as complicated as 8ball. The weak local player is certain to miss long shots or ran out of position much more often then he would in 8ball.(again im assuming 1 shot each format)