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As 1
is occupied for the stronger hands from 16hp onwards, we have to combine hands
with a longer minor suit into one opening bid : 1.
An interesting side-effect of this approach is that there is always an 'escape'
bid available : 2/3/4 , pass-correct.
As it is important to know as soon as possible whether a major suit in partners hand is a 4 or 5 card, we try to use the limited bidding space optimally for that purpose :
1
: from 6+hp onwards an unknown 4 card major. If 12+hp, any distribution without
5 card major is possible.
1
: <10hp , 5+ card
1NT : <10hp , 5+ card
The partnership knows that game is not intented.
Stronger hands with a 5
card major are bid in transfer : 2/2
.
Without a 5 card major, the partner can bid 2/3NT , or, with 12+hps, go via
1 .
Using transfers , 2
becomes avaialble to show a hand that else becomes difficult to bid : 54
, 10-11hp, NF.
The 3-level, 3,
are there to show long suits.
WIthout a 4 card major, there is
the escape 2
, P/C, (<10hp) and/or with 10-11 hp : 2NT , or with 12+hp : 3NT.