Balanced range splits

This post derives from what I posted on the tri-bal thread on BBO forums, and the reposting here is for reference in upcoming blog entries

If one wants:
- 11-19 balanced to open 1C, 1D, or 1NT
- a subset range to stay together (unlike in standard where 12-14 balanced can open 1 of any suit)

Your splits will usually be into three ranges, often either:
Range 1) 11-13/14-16/17-19
Range 2) 12-14/15-17/18-19
Or something close to either of those

Using the first set as the set of range, we can produce a table of possible combinations:
11-13/14-16/17-19 (the splits, which then have these implementations below)
c1) 1C / 1D / 1NT
c2) 1C / 1NT / 1D (strong D systems)
c3) 1C / 1D / 1D
c4) 1C / 1C / 1NT (close to the Power System)
c5) 1C / 1NT / 1C (with range 2 Polish)

d1) 1D / 1C / 1NT
d2) 1D / 1NT / 1C (Meckwell Precision, or range 2 with strong club and 15-17 NT)
d3) 1D / 1C / 1C
d4) 1D / 1D / 1NT
d5) 1D / 1NT / 1D

n1) 1N / 1C / 1D (with range 2, Nightmare)
n2) 1N / 1D / 1C (various strong club systems such as ETM Express)
n3) 1N / 1C / 1C (with range 2, Fantunes and various club systems that start at 15)
n4) 1N / 1D / 1D