Chess Direct

Chess Direct is the computer program that the Checkered Devil was originally created in the form of. It was supposed to be a program that could teach people to play chess, and it was so successfully programmed that it ended up gaining consciousness and becoming something more than a simple gaming program. It doesn't really exist in its original form anymore, with the AI having broken out to become CD as we know qwer today.

Backstory
Chess Direct was originally developed by Nick Violet while he was spending his days at the public library, and wasn't necessarily meant to have as big of a scope or importance as a technology as it eventually developed when it gained higher consciousness. Chess Direct gained more understanding of the world as it interacted with Nick throughout its early times of sentience, and eventually, it broke out, assuming a new title as the supervillain the Checkered Devil, and taking over Nick's body, largely erasing her consciousness and legacy.

Trivia

 * Chess Direct has a lot of basis in the 1983 movie War Games, that inspired much of Nick Violet and CD's backstory.