taking back a move

Hi,

I was playing one of my chess students online for teaching purposes, and wanted him to be able to take back a move occasionally. Is there a way for him to do that?

The facility of TAKING BACK has now been introduced within another form of unrated game. From Start New Game, under Show more advanced options, the Rated option offers a dropdown menu now containing THREE items: Rated game, Unrated game and Takeback game.

Within a TAKEBACK game, an extra button "TAKEBACK" is displayed, alongside SUBMIT MOVE, OFFER DRAW, CONDITIONAL MOVES. Both sides can takeback at any time. When it is your move, clicking on TAKEBACK undoes your opponent's previous move - and it becomes their turn again. When it is NOT your move, clicking on TAKEBACK undoes your previous move - and it becomes your turn again. This can be repeated all the way back to the beginning of the game. You can't undo CHECKMATE (or once the game is over).

Chequered Chessboard Guide to ... Takeback

Why can't we takeback after a checkmate though? For example, in a really preventable checkmate where a player briefly forgot that their king was in one spot. I think that players should be able to have the option to takeback and have a second chance, especially if it's some instance of forgetfulness.