Many gamers are highly protective of the “lucky D20” they use for certain die rolls. In some cases, that’s not superstition at all, it’s taking advantage of a manufacturing flaw in polyhedral dice:
One of the biggest manufacturers of RPG dice is a company called Chessex. They make a huge variety of dice, in all kinds of different colors and styles. These dice are put through rock tumblers that give them smooth edges and a shiny finish, so they look great. Like many RPG fans, I own a bunch of them.
I also own a set of GameScience dice. They’re not polished, painted or smoothed, so they’re supposed to roll better than Chessex dice, producing results closer to true random. I like them, but mostly because they don’t roll too far, and their sharp edges look cool. I couldn’t tell you if they truly produce more random results.
But the good folks over at the Awesome Dice Blog can. They recently completed a massive test between a Chessex d20 and a GameScience d20, rolling each over 10,000 times, by hand, to determine which rolls closer to true.
In a video from a few years back, Lou Zocchi explains why his dice are the best quality in the business:
