Noticed after posting this that actually executing a takeback doesn't seem to be an option on the iOS apps either, not just creating the game with the option. Both would be a welcome addition - I really want to use this option in games with my son, and great for teaching games in general as well.
Takeback games
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On the iOS app it would be nice to have the option to start a takeback game in addition to the existing rated and unrated options, similar to the way it works on the web site. Any chance of making that happen in a future release?