To open 1N or 1  that is the question
   


First make certain that no other betaacol opening bid is appropriate - if there is then do not choose either 1  or 1N.

In the case of 1N make necessary HCP adjustments and verify to be in your chosen range. The default strength we use is 12-14. However those that favour other strengths with a 3 point range such as 13-15, 14-16, 15-17, 16-18 or even variation with vulnerability may  choose to do so. In beta good 3rd hand 12-14 1N openings are encouraged BUT we will not shade to 11 HCP. However a 1 opening is usually 12+ but maybe shaded to 11 in third or fourth hand opening positions.

The distribution restrictions on our 1N openings must be adhered to in all positions these are:: No 5 card Major or Diamonds, No void or singleton, at least 4-3 in the minors, a 3 card minor must be headed by one of AKQ and allowed distributions are 2245, 2236, 33{43}, {24}{43},  {23}44,  {23}35.

The choice is now easily made! If the 1N opening conforms to these rules and is in your chosen point count range: Then  open 1N - Never 1. Otherwise always open 1 with 12+.

So we prefer 1N whenever we can instead of 1♣ with the mild pre-emption it offers. The theoretical reason for this preference is that the IN opening may contain a single 4 card Major about 25% of the time with a distribution of {24}{34} - an ideal 1N distribution. So are {23}44 & {23}35.
Now {34}{33} hands are always opened 1 and any of the above mentioned that fail the Hxx test in a 3 card minor are also opened 1.

The limitations Beta paces on a 1N opening are aimed at practically making a safe minor suit exit from 1NT * as partner can bank on finding at least 3 card minor suit support.
These restrictions  have reduced the % occurrence of a 1NT oipening in Beta to be significantly lower than its occurence in ACOL. On the plus side a significant increase in the frequency of a 1 opening - this fits very well with the mathematical  'theory of information' - and Beta uses this advantage to its limit. See our 1 opening for details.