I’ve added better red and green overlays that are translucent so that you can see through them an easily know what piece you are taking. But most importantly, I’ve added check detection. I created a few new functions to do this. The first function I created was the isSquareAttacked(row, column, atkColour) function. It works by cycling through the bitboards and checking if they are atkColour or not. If they are find the type of piece and those pieces could attack the king. I think this will be helpful when I start to actually make the bot. I also created a simple findKing(colour) function to see where the king is so that I can parse that information into the isSquareAttacked() function. I then get a boolean. If it is true (the king is in check) I add the red overlay to the king so that the player easily knows they are in check but I don’t actually force them to block the attack yet. I think the overlay should be different but am not sure what to make it (gimme some ideas). I also created a slidingMoves() function as in my calculateLegalMoves() function I had ~40 lines of almost fully repeated code. Next I am going to force the player to block the check and end the game if it is checkmate.