Didn't really get the need for AI NPCs here, I too never got a response. But I think this has really great potential. Very cool idea. I really liked the knights movements, they were very accurate. I think if the rook and bishop also had accruate movement's (like dashing straight or across diagonals) they would be more challenging and deadly. Especially if that logic is applied to queen because she is so versatile. Well done overall!
Cheers!