Watched a breakdown where someone built a personal AI chess coach with Claude Code in a couple of hours. It reviews every game, learns your weaknesses, and drills you on them, basically a $500/hr coach for free.
The bigger point is not chess. The same approach replaces a lot of the subscriptions people pay for every month. If you can describe it, you can build it and own it.
He also runs a free community, KVK Automates AI, with the template for this build.