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Grammatically correct are: "Against whom are you playing?" (in the very formal English), "Whom are you playing against?.
These questions derive from statements: "He is the man against whom I am playing", "He is the man whom (or who) I am playing against". "Whom" is a complement of a preposition "against". A preposition can precede its complement or be moved ...
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I think "I should note that our current users range from juniors to seniors and graduates."? can give the same meaning.
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