False Preference
When in the maxi-minimum range (8-9 support points), and holding 2 cards in opener's major and 5 cards in opener's minor, you are worried about passing and missing game when partner has some extra-values. So you take 'preference' to 2 of openers major. This keeps the bidding alive and allows partner to take another call even though your preference would in fact be for the minor.
When in the mini-minimum range (6-7 support points) and holding 2 cards in opener's major and 4 cards in opener's minor, you Pass. Even though the 'rule' says to prefer the major, the last thing you need is for partner to take another bid with extra values. By passing in a known fit, you hope to ensure the partnership a plus score.
Read more about this topic: Forcing Notrump
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