Does anyone has information about why we play 9-ball and not some other games no one heard about? Were there semi-popular alternatives a century ago?
I've heard one idea was - because of the gambling, meaning the more people wanted to bet on this particular game - the more popular it became.
This, however, is quite unsettling, because gambling makes more sense if the outcome is less predictable, meaning that games that became more popular had more luck element in it.
Recreationally, the pool games that survived are the ones people enjoy playing the most, and eight ball is certainly at the top of the list. Right now, we live in a world where 8-ball and 9-ball are the only games with a really big following among most pool players. There are other great games, but the rest are what I'd call fringe games.
Nine ball replaced straight pool as the primary competitive game because it's easier to follow, has more pace, and doesn't require the calling of shots, which was always a big negative for the onlooking fan. Of course, the "two shot shootout" version of nine ball was barely watchable for the typical fan (this one included) and was quickly replaced by the far more watchable Texas Express version, which largely eliminated mid-rack pushouts and the spotting of balls, and caused the pace to be picked up. Some feel 8-ball is more watchable, and the IPT tried to reestablish it as the pro game in 2006, but others, Irving Crane once among them, suggested that 8-ball is not a sufficiently difficult test of skill at the pro level.
I do not agree that the gamblers, who make up just a tiny fraction of pool players, have had much influence on what games get played. I agree with those who suggest that gamblers are looking for games with smaller elements of chance, but in the end, the gamblers play the games at which they believe money can be made. For some, this means playing opposite handed or even one-handed, but the gamblers play whatever it takes to make money, which makes sense.
Though it is not pool, snooker is the most watchable cue sport. Red-color-red-color, etc. until there are no reds left and then the colors in rotation is so simple to follow that my grandmother was still watching snooker into her late 80s. The reds don't look like the colors and each of the colors remains in the same spot for much of the game. Unlike pool fans, snooker fans never struggle to locate or identify the next ball and don't bicker about the color or resolution of the numbers on the balls.
Take a bow for an interesting thread topic, for there are many elements in the evolution of the games and their popularity in pool, making it a good subject for debate.