A quote from The New Yorker:
The Oxford Dictionary provides instances of the word level being used as both count and noncount noun.There appears not to be on record any case (including Bobby Fischer) where a person reached grandmaster level with less than about a decade's intense preoccupation with the game.
But:at six he could play chess at an advanced level
Could we spatchcock an article (A or THE) before "grandmaster level" in the quoted sentence, turning it from a mass noun to a count one?[mass noun]: women do better at degree level