Undo

Just played a game and the guy he ment to castle but dropped the king. He then asked me to undo the move. Can this be done? If so how? I would have offered a draw but I was a knight up.

well, did he drop it like and it fell over or dropped it on a square beside it in tournaments a move is a move and cannot be taken back, but playing friends or just for fun i dont see why you would want to enforce. When i play my friends that i am stronger than i let them take back some of the weaker moves they play :D

Sorry if I wasn't clear, It was a 10min blitz on this site. Is there an undo Facility? As you say I would have been happy to allow the correct move.

No, (though it's been discussed for years ... take-back).