Rule of 64
On 4 September, 2013 At 8:32
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When opening a hand that is 6-4 in the majors, show the four-card suit only if the number of HCP in the four-card suit is greater than or equal to the number of HCP in the six-card suit.
If this is not the case, rebid the six-card suit and do not show the four-card suit.
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