Original but the strategy is so different from classic chess that I was lost. Actually, even the advanced bot is lost. He often gets the lead but then he sabotages itself and give me the victory.
Also satisfying sound.
And maybe one bug: in the split level, against advanced bot, play the pawn in front of your king. The bot will exploit a nice combos for him that expose your king (I didn't think, too much used to move that pawn...). But then, you can't move your king at the top left diagonal square while you should be able to... Play something else and next turn you can.