1) It's good for 16 point strong club systems, where 8 counts force to game, since it takes the balanced 16s out of the 1C opening, but still takes a lot of bids out of the limited bids (particularly 1D in Precision).
2) It occurs 33% more frequently than 15-17. Because you invite with 9, you don't miss nearly as many 4-4 major suit fits as you do with a 12-14 NT, where you need 11. You also don't go down much after 1NT - all pass. It thus has some of the frequency advantage of the weak NT without (mostly) its disadvantages.
3) The opener's NT rebid limits his strength to 13. This is particularly useful if you open light, so your NT rebid range is 11-13 vs 11-14 in 15-17. OTOH, the NT jump rebid shows 17-19 vs 18-19.
My questions are:
a) Have you played it, and do you like it? I do so far.
c) How many people are playing it? From what I have been able to glean, it is pretty popular among strong clubbers. Apart from them, it seems to be unusual in the U.S. (where I live), but seems to have some popularity elsewhere, especially in the U.K.
Comments?
Peter

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