Freeing up the one level for two hand types

Success factors/priorities for a system:

- Separation of balanced (bal) and unbalanced (unbal) hand types below 18
- Opening showing 4Ss unbal
- Openings showing 5+Ss or 5+Hs
- Openings showing a minor suit unbal, can be combined with a big hand type

This requires two opening suit bids at the one level to be freed up, one to show 4Ss unbal, and the other the balanced hand outside of the 1NT range.

Here's a mid-chart example:

1C: 4+Ds, 10+, unbal, fewer than 4Ss OR 17+ Cs or 18+ Any
1D: 4Ss, 10-17, unbal, often longer second suit OR 16-17 7+Cs
1H: 15-17 bal
1S: 5+Ss, unbal, 10-17
1NT: 12-14 bal
2C: 6+Cs or 5Cs+4Hs, fewer than 4Ss, unbal, 10-16
2D: 5+Hs, fewer than 4Ss, singleton if just 5Hs, 15-17
2H: 5+Hs, fewer than 4Ss, singleton if just 5Hs, 10-14

Since the ACBL has further restricted mid-chart (senior citizens more comfortable, younger players less fun or less younger players), the 1D opening cannot be a pure 4S bid anymore - here we add the 16-17 7Cs option to make it a "catch-all" that does not promise any particular suit.

1H and 2D are 15-17 artificial, since 15+ artificial openings are allowed, but 14s would not be upgradable into these openings. The shapes 2-5-4-2 and 2-5-2-4 exactly would have to be treated as balanced, as the 2D and 2H openings promise a singleton if just 5Hs. The 1C(two-way)-1D(negative);-P (minimum, Ds unbal) sequence is the way scientists get to the standard 1D all pass.

Here's a super chart:

1C: 4+Ds, 10+, unbal, fewer than 4Ss OR 17+ Cs or 18+ Any
1D: 11-14 bal
1H: 4Ss, 10-17, often longer second suit
1S: 5+Ss, unbal, 10-17
1NT: 14/15-17 bal
2C: 6+Cs or 5Cs+4Hs, fewer than 4Ss, unbal, 10-16
2D: 5+Hs, fewer than 4Ss, singleton if just 5Hs, 14-17
2H: 5+Hs, fewer than 4Ss, singleton if just 5Hs, 10-13

The 2H and 2D openings will hurt sometimes, taking up too much of our bidding space, but the opening makes it easier to get to 4H without the opponents reaching 4S, a common irritating circumstance.