In particular today I opened 1st seat all white 2♣ with 11 HCP the following hand:
Scoring: IMP
Is such a system and bid legal in the ACBL assuming the convention card is properly filled out to include OR distributional 4 LTC hands and that both partners value such a hand as a strong hand? If it is legal and partnership does open hands like this must all 2♣ bids be alerted, or if both partners think such hands are strong does it not need to be alerted?

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