I think it means the opening is considered "sound", which in chess language means that the moves have been tested so much that the errors would come after the opening. I think? Or, it could just be a boast. Saying "never" makes me feel like it is a boast.
What does "will never be refuted" mean?
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"The Queens Gambit Declined, Orthodox Variation is an opening choice for Black which will never be refuted."
What does the above statement mean?