FOUL !!!
...is laying your stick down and leaving unhanded it to measure.
Is that ok for your APA too?
Actually Oz, this is legal in BCAPL play as well.
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To my mind, one of the worst rule in APA is the allowance of pattern racking. But let's face it, there are a lot of things different about how pool is played in APA. For instance, in reality 9 Ball isn't even played in APA. The so called 9 Ball format is really more akin to a handicapped game of slop rotation played with 9 balls and scored like straight pool.
I guess all these rules variations have to be taken in the context that the game is being played under a league structure and therefore the game itself is not the only consideration. Also relevant is the interests of the members, the management of the venue, and the league itself as a business (in the view of management). People play league for many reasons, not always to shoot pool under strict WSRs, but to have a night out with friends, get away from the kids for a few hours, relieve stress, have a few drinks, meet new people.
Given that, it seems the APA has concluded that it is best to simply allow many things that would normally carry a high degree of deniability and therefore lead to unpleasant arguments and disputes. Constant arguments over rules violations, especially those that are easily denied, would not make for a pleasant experience for many members, and that would probably not be good for business.
The BCAPL on the other hand, seems to have set itself up more for pool players wanting to play by recognized rules, and therefore the rules are much more in line with WSRs. But because even BCAPL members participate for reasons other than just hardcore pool alone, there seems to be relatively few problems with even the deniable rules (at least in my league). People play by the rules but are also generally very civil and sportsmanlike maybe because they're not just there to compete but also have fun. For instance, I've yet to see a dispute occur when a player has failed to clearly call the 8 Ball.
It's hard to argue that both these approaches seem to have worked well for their respective organizations. Obviously the APA is successful. And so is the BCA.