That depends. I would probably say around 1300. But a person at 1200 may disagree ;-)
At what rating are you no longer a beginner

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It depends on who you ask. I think 1200 or 1300 is no longer a beginner.
Somebody who is rated 900 is a strong beginner.
A grandmaster rated 2800 might say that a rating of 2000 is a beginner.
What rating do one need to hit to no longer be classed as a beginner?