This blog provides supplementary thoughts and ideas to the site. If you haven't seen the main site, there is a lot there including the Martel and Rodwell interviews, photos, and articles. This blog is focused on advancing bridge theory by discussing the application of new ideas. All original content is copyright 2009 Glen Ashton.

Wednesday, July 16, 2008

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


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