In 2015, I build an IoT chess board, designed to enable the user to play chess online, but with a physical board.
This means that incorporated into the board are LEDs in each piece and square, and detection of the location of each piece.
It uses a Raspberry Pi as a web server and an Arduino MEGA to control the electronics.
Each 3D printed chess piece has a 3mm jack, which provides power to the LED inside and allows detection of the piece’s location.
Ben James 
Saw your project in the the MagPi magazine. Very impressive. Has it improved your online game? Or is it just a better gaming experience?
Thanks very much. I would say the latter; it’s just really nice to be able to look at the board and pieces in 3 dimensions, and to be able to physically make your move by placing a piece 🙂
Do you have a git hub repository with all the code and diagrams for it?
Hi Austin
Yes, here you go: github.com/bengineer19/chess
Happy to answer any questions about files/information that aren’t on the repo.
Do you sell your chessboards??
Hi Toni, thanks for your interest but I’m aftaid I don’t sell these.