An action mentioned in the Chalk Farm rules of 1984
(Appendix 2A, note 7) but rarely used, as it requires the Thraping Coefficient
and the line velocity
of the Circle Line to be exactly 3π apart. This has only occured twice in tournament play, both times being played by Mrs Trellis
games. The Thraper
must have silver tokens on Embankment and Baker Street, and then huff
a player towards the Circle Line. The non-parity between the player and line LVs cause all tokens on the Circle Line to move three stations anticlockwise. When the opportunity is spotted, this can severely hamper attempts to change lines in zones 1 and 2.
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