Qx(-3,14)
Chess on an Infinite Plane (aidanB1 - HorribleTomato)

Wait he gets to take it back? R(2,-3) was legal! Oh whatever... should we restrict these privileges? What if someone blundered and is like No take it back! Anyways my move is C(2,7)

No, takebacks are not allowed, unless the opponent allows it. Sorry it's my mistake. Since you moved your king, I thought you accepted his request for a takeback.
K(3,7)