petqwe
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Does this problem finally come down to: - whether a 2NT opening is a strong balanced or not - if yes, then what the range of 2NT is - if 1♦ is negative, whether a 1♥ rebid is natural or 2-way or simply second round forcing - if 1♠ is double negative, what the range of 2NT rebid is And do people use their own invented system here?