In competition karate, are you allowed feigns?

ie to pretend to punch/kick so the opponent goes to block the pretend strike which leaves him open to another strike of yours you have ready for him? and what about simply distraction stuff like waving your hand out to the side in the hopes he will look at it and while he is temp distracted and looking away with... show more ie to pretend to punch/kick so the opponent goes to block the pretend strike which leaves him open to another strike of yours you have ready for him?

and what about simply distraction stuff like waving your hand out to the side in the hopes he will look at it and while he is temp distracted and looking away with perhaps a lowered guard you strike?

and whilst I'm at it, are the above two "tactics" a good idea for a real-life self-defence scenario?
Update: waving my hand isn't the best example but you know what I mean
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