[r-t] Lead-based methods [was: Poll on consecutive blows in the same position]

[Mark Davies]

Iain Anderson writes,

> One of the problems that I have with separating LBMs from RBMs is that
> in my mind they aren't mutually exclusive.
> The 7 particle methods are a classic example.  I have learnt and rung
> Top, Up, Strange, Down, Charm, Bottom, and Meson as rule-based methods
> because it is a lot, lot simpler to treat them as a series of rules
> rather than a set of traditional blue lines.

Yes, and for this reason perhaps "rule-based method" is completely the 
wrong term to use. "Dixonoid" or (in Don's new system) "Non-β" is less 
confusing. The idea is that this type of construction cannot be defined 
as a fixed sequence of changes; this contrasts with Kent, Bristol, 
Charm, Bottom and so on, where, although you might be better off ringing 
them by a rule, they can certainly be described by a string of place 
notation.

MBD