Castling! I’ve actually added castling this time. The castling also works with undo / redo move so that it undoes and redoes the move correctly. I’m starting to think my python file is getting a bit big now so I also created a few helper functions to help reduce code duplication. Its 572 lines currently. Luckily I am quite close to finishing the actual board and getting everything ready for a 2 person game of chess. This was my first goal so that the bot just becomes one of the players. Once I’m ready for a 2 person game of chess I’ll try to create another python file for the bot. This will help me keep track of what is doing what. Next I am going to add pawn promotion as that’s one of the biggest things that I don’t have yet. It is essential in late game and so is one of my priorities.