ChessCraft is a chess variant sandbox with a custom built AI. The latest update has a random board generator, and therefore bajillions of chess variants! : r/chessvariants
ChessCraft - Apps on Google Play
Chess Craft Tournament - Chess Forums - Chess.com
ChessCraft: make your own rules
ChessCraft - Apps on Google Play
ChessCraft on Steam
ChessCraft - Never play the same game of chess again