I’m thinking
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On all games, color the last played stone a different color, or highlight it in some way, when an undo is
maderequested. (thx for the correction, @Kosh!) -
On correspondence games, pop up a box that asks for an undo. This can happen at most once per move.
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Add support for requesting an undo for more than one move back, ie at any point in the tree.
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Make an audible sound when an undo is requestednow we have this -
Option to disable the pop up