arvie, on 2012-June-09, 04:38, said:
I like [...] the protection of the 1C opening with the 11-13NT.
It seems you are under the impression that 17+ hands will do as well, or better, having opened 1C showing 11-13 NT or any 17+, than having opened a pure 17+ 1C. This is not the case.
After you've opened a two-way 1C in first seat, the next hand has to be more constructive, I admit. However, when they do preempt, you are in a worse position, as now partner is bidding assuming you have an 11-13 NT, so you will almost certainly have to take another action on a 17-19 hand. Compare that with opening a strong club on a flat 18 count and seeing the next hand bid 3S. If partner doesn't act, you have no more interest in the auction, you have shown your hand already.
Worse still is when you open a two-way 1C on a 17+ hand in second or third seat. Now you'll get a lot of preempts from the next hand, who is no longer worried about missing game.
The advantage of a two-way 1C like Svan is very much in the <17 hands. Compared with Precision with a 14-16 NT, you get a much better initial description on both 11-13 NTs and unbalanced hands with diamonds.
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the MC has no weak variation in the 1C opening, and I don't like the 12-15 NT range.
You could play it as 12-14 [or 10-13/11-13 1st NV if you preferred] without any problems.
Balanced hands should, as far as possible, show their strength with their first bid. Precision with a 14-16 NT is good for this - 11-13, 14-16 and 17-18 can all make their opening bid then let partner take control. Meckwell take this a step further, they open 2NT with 19-20, so it's only 21+ balanced hands that will need to take positive action.
This is why, with a weak NT, it's good to play 1C as 15+, clubs or balanced. You've got the strength of the 15-17 NTs across to partner with your first call.