You can only play your "intended" opening if your opponent cooperates. If they don't, you have to find an appropriate answer. Especially if the opponent's move is considered inferior by current theory, you won't find that answer in your repertoire books.
How to respond against akward replies in opening?
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When you want to develop a certain opening but the opponent/cpu responds with some strange(?) replies not covered in the opening replies explained. What do you do with it? Keep developing your opening you intended or find another response and forget about your opening strategy you had in mind?