This is real chess we are playing here. What would you do if you shanked your number 7 iron shot ? Say to your opponent "oops I didn't mean to do that, can I try again?"
take backs

I too feel that would be a nice feature... since sometimes the mistaken move is purely a technical glitch, e.g. the mouse sticking and dropping the piece to an obviously wrong square for a ridiculous move. The opponent could have the option of being generous and allowing a "do over" if requested immediately (within a set time, say 3 or 5 seconds). Especially if a fun game is underway.

On other sites, I have seen where people have abused take backs and requested 5 or 6 take backs in a game. Not a feature I would like.

Take backs are allowed in "online" correspondence/daily games.
Can I take back a bad move?
You can... but only if you're playing a "Takeback" game in Online Chess! (There are no take-backs in Live Chess.)
Takeback games are always unrated, and provide a great tool for learners and for those willing to act as guides. Here's how to set one up:
On the Create New Game page, select "game options I select" to see the options underneath.
Then, on the drop-list that says "This is a rated game," click and choose "This is a takeback game" instead (see image above). Proceed to create your game as always.
In a Takeback game, a special "Takeback" control appears under the Chat box & Move list.
Either player can click "Takeback" at any time:
- When it is your move, clicking "takeback" undoes your opponent's previous move; it is their turn again. (Use the chat feature to tell your opponent why you think they should try something different.)
- When it not your move, clicking "takeback" will undo your previous move; it is now your turn again.
keywords: training, teaching, instruction, instruct, teach, tutor, coach, coaching, take back, take moves back, reverse, undo
Keywords: Take Back, unrated
If you need help, please contact our Help and Support team.
Is there any way to enable "take back"s for online games? I can't find that option on my iphone, and made an honest mistake trying to move and have conversation with colleague at work. Ugh.