[r-t] Doubles

Philip Saddleton pabs at cantab.net
Sun Oct 24 10:46:10 UTC 2004

Philip Saddleton <pabs at cantab.net> wrote at 19:30:47 on Fri, 22 Oct 2004
>Can someone provide sets of 42 extents of spliced Doubles (symmetrical 
>single-hunt Plain) with the following properties?

No one has answered this yet.

>a) The 177 methods with 3- or 4-lead courses (excluding 145 lead ends), 
>with a plain lead of each method.

I've done this, with a few extents to spare.

>b) The 220 methods if 145 lead ends are included, all plain leads.

Almost, but is it possible to include either of these two in such 

Montgomeryshire Place: le23
Cathedral Place: le23

The problem is the four blows at front and back, which means that 2 or 4 
at the lead end does not produce a legitimate method, and 1 gives a 
2-lead course. There are 2-lead splices with the methods with 345 at the 
half-lead, but these cannot be joined into an extent. There is also a 
4-lead splice between the two, but this doesn't help.

>c) The 282 methods with Differential Hunters included, again all plain 

That should be 283.


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