"The Royal Game of Ur"? More like "The Leonard's Game of Weighted Die"
...fun game though, good job!
My only complaint (besides Leonhard the cheater) is that there's no way to cancel a click. I.e. when you click a piece, it doesn't move until you release the mouse button. This is misleading because it feels like you have the chance to move the mouse away to cancel the selection, but no matter where you put the mouse that piece will move the moment you release the button. Either make the move activate instantly ondown, or do the piece selection/collision/raycast/whatever onrelease.