The best opening technically doesn't exist, BUT there's openings that are better than others for example: Jobava London(used by GM's like Bortnyk and Carlson),KID(used by GM's throughout the years),Sicilian defense (used by world Champs throughout the years Bobby Fischer ,Magnus Carlson[magnus has been undefeated in the sicilian for a couple of months]
What is the best opening?
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My personal favorite is Kings Pawn knights variation