Not related to shortening the game, but one interesting 8-ball variation is "Half-table 8-ball". Only difference from normal 8-ball is that if by the end of your shot any ball is within the opposite half of the table from the rack, your opponent gets ball in hand. Balls can still be pocketed in any pocket or travel through the other half, they just aren't allowed to be there once a shot has ended. To make the break more fair (blasting it hard guarantees balls would end up on the wrong side of the table), the breaker will always get to continue after the break even if no balls drop in, so a good break shot is a soft hit, opening up the balls a bit without moving any of them to the other side.
This variation makes for some interesting short-distance position play, tactical exchanges and straight-pool like opening of clusters with soft speed shots. I suggest anyone who enjoys these aspects of the game to give it a try. The rules are simple enough to remember easily as a variation from normal 8-ball rules.
Extra details about rules:
- BIH cannot be placed on the wrong side of the table.
- If an object ball is on the wrong side of the table when a shot ends, it will be spotted. If the spot is occupied, it will be put as close to the spot as possible similar to how it's done in other common games.