[Home]History of Bifurcation

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Revision 5 . . (edit) April 8, 2007 12:41 am by Simons Mith
Revision 3 . . (edit) March 26, 2007 6:50 pm by Simons Mith
Revision 1 . . September 17, 2004 12:59 am by JLE [Copied over, and a new paragraph added.]
  

Difference (from prior major revision) (minor diff, author diff)

Changed: 1c1,3
It is possible for the game to bifurcate. When this happens, the game splits into two strands and players must move in both. In this situation, the game can only be won by playing Mornington Crescent in both strands simultaneously - or by recombining and then winning normally. Recombination occurs when more than twelve tokens (of any colour) are in the same quadrant and on the same line, while the player meets both strands at the same station with LVs that complement rather than oppose.
It is possible for the game to bifurcate. When this happens, the game splits into two strands and players must move in both. In this situation, the game can only be won by playing Mornington Crescent in both strands simultaneously – or by recombining and then winning normally. Recombination occurs when more than twelve tokens (of any colour) are in the same quadrant and on the same line, and a player successfully brings both strands to the same station at the same time with complementary rather than opposing line velocities.

Example: Overall line velocity is +5 Northbound. One strand of a bifurcation has a line velocity of +3 NorthEast, and the other strand +4 NorthWest. In this highly simplistic example, a T 8.13° rotation (see spin) would combine the vectors and allow the bifurcation to be rejoined.

Changed: 5c7
Tri-, quadri- and greater furcations have been known. As, indeed, have semifurcations - where only half a station name is played in one or more strands (a typical such move could be: Totteridge / Wealdstone). Even rarer are other fractional furcations. The record number of furcations known in any one game is 18, and the record number of strands open at the moment of victory is eight: both records were set in one game under the [Reykjavik '92]? ruleset - a variant ruleset which is not only notoriously lax about the conditions under which bifurcations and greater can occur, but is one of only two rulesets to allow both a nullifurcation (zero active strands) and a non-integer fractional furcation, where the station fractions do not add up to a whole number of stations.
Tri-, quadri- and greater furcations have been known. As, indeed, have semifurcations – where only half a station name is played in one or more strands (a typical such move could be: Totteridge / Wealdstone). Even rarer are other fractional furcations. The record number of furcations known in any one game is 18, and the record number of strands open at the moment of victory is eight: both records were set in one game under the [Reykjavik '92]? ruleset – a variant ruleset which is not only notoriously lax about the conditions under which bifurcations and greater can occur, but is one of only two rulesets to allow both a nullifurcation (zero active strands) and a non-integer fractional furcation, where the station fractions do not add up to a whole number of stations.

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