Thanks for the feedback. I adjusted the controls so you use the space bar to move the pieces up and down. Hopefully this makes the controls a bit easier
AI has been added to the game but it is super slow. It usually takes 30 seconds a move but it can take up to around 5 minutes. I'll try to improve this in future updates
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 "4 Player Chess"){kind=icon}
I adjusted the physics and allowed the pieces to move up and down by pressing W and S so the piece movement should be a little better now.