One Ruleset you appear to have overlooked is the controversial
Longleat Accord. This was introduced for the now abandoned Home
Nations Series (1957-1974). As a result of the Northern Ireland teams
protests concerning their under-representation on the Great British
Olympic MC Commitee, a meeting was held at Longleat and the
controversial Vann-Hoff rule was implemented.
Ironically this backfired on the very person who most pushed for the
rules introduction, Northern Ireland's controversial captain and one
time World Champion, William McFarlane. During the Northern Ireland Vs
Scotland match he was positively stumped by the previously unheard of
call of Bristol Templemeads (only allowable under the Van-Hoff rule).
his only move was East Acton leading straight to Mornington Crescent
for Cameron McVey for Scotland.
Luckily the rule and the longleat Accord are merely MC history after
the Home Nations Series was abandoned in 1974. Although it still
proves that knowing all rulesets can give the scholarly MC competitor
a big advantage.

Hope this helps rather than confuses the newer more amateur readers.
For a better explanation you could do worse than Mornington Crescent
Made Easy (ISBN 4537353-3463)

Regards,
Matt

On Sun, 24 Aug 2003 11:26:29 +0100, Jamie