A way to play vs AI from before I screwed up?

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alexgilseg

Is there a way when I look through my game and continue vs AI after the game is finished. 

Say I blunder my queen at some point but would find it intressting to complete that game from the position before I blundered vs AI. Is it doable? 

Also, is there a way to drill openings vs AI with some efficiency? Trying to find ways to make my training more efficient than just solving puzzles and playing games..

Thanks