[ilink url=”http://csbnews.org/new/?p=13946″]All the Bridge Rules[/ilink]
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.