[r-t] Practical Extension

[Robin Woolley]

A few thoughts of Don's thoughts about extension above of Kent by way of 
reviewing the extensions of Kent TB ‘above’ the treble with a comparison 
of extensions of Cambridge S.

  The usual extension – 34x34 – denoted 1CD - is the same extension PATH 
as used by York S at all stages.

The extension having 34x34.8.56x56 – denoted 1BC – is the same as used 
by Cambridge S at all stages.

The extension having 56x56.8.56x56 – denoted 4BC – is used by ManukaS

The extension 56x56 – denoted 4CD – is the extension used by Pudsey.

  If I have read Don’s comments correctly, it could be interpreted as 
preferring Pudsey as the extension of Cambridge and the current 
extension path would not have been allowed.

  The Extension rules are fully symmetric - what you can do on the back, 
you can do on the front. (In fact, I find it easier, by hand, to extend 
'above' by considering extensions 'below' then inverting.)

  Suppose that a TD6 method has 34 made with the treble in 5-6. Norwich 
is such an one.

  Following Don’s argument, an extension having just 56 places made 
under the treble in 7-8 with none (under) in 5-6 would be (subjectively) 
preferred to those having both 34 and 56 or 34 and 34. (If you do not 
accept 56x56.8.56x56 above as an extension, you cannot accept x34x1x34x 
below on symmetry gounds).

  Available extensions (via RAS) of Norwich are:

2DE/5EF -34-4-2-3-34-3-34-1,1 (8 [2] 60)

2CD/2EF -34-4-2-36-34-5-56-1,1 (8 [2] 60)

2BC/2EF -34-4-256-36-34-5-56-1,1 (8 [2] 60)

  none of which follow Don’s idea.


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