Difference between revisions of "Writing an A-B Rallye"

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== Looping ==
== Looping ==
There are three main types of RI in an A-B rallye:
There are four main types of RI in an A-B rallye:
# Both parts refer to the same action(s), performed at the same location(s). The question is whether each part is valid.
; Same Location : Both parts refer to the same action(s), performed at the same location(s), and the rallyist must determine whether each part is valid.
# Both parts occur along the same route, but not at the same location. The question is whether the first part is valid.
; Same Route : Both parts occur along the same route, but not at the same location, and the rallyist must determine whether the first part is valid.
# The parts occur along different routes, and one route loops to rejoin the other.
; Supp Style : One part occurs beyond a turn for a gimmick (typically using Observe or CS), and the other part acts like a Supp to get rallyists back on route (e.g., "U at Smith, R 1st Opp").
; Looping : The parts occur along different routes, with the two routes eventually rejoining.


Simple gimmicks based on instructions that are invalid per the GIs
Simple gimmicks based on instructions that are invalid per the GIs
(e.g., misspelled street names or words that "do not exist on signs")
(e.g., misspelled street names or words that "do not exist on signs")
typically use either the first or second type of RI.
typically use either the Same Location or Same Route type of RI.


More complex gimmicks (especially those that have rallyists turn on specific streets)
More complex gimmicks (especially those that have rallyists turn on specific streets)
typically use either the second or third type of RI.
cannot use the Same Location type of RI.
The second type of RI makes the gimmick much more obvious:
When they use the Same Route type of RI,
the first part refers to the same turn as an instruction of higher precedence.
they tend to be more obvious because one of the parts will refer to the same turn as the higher-precedence gimmick.
The instruction of higher precedence is done instead of the first part of the RI,
Rallyists need to realize that they should do the turn for the higher-precedence gimmick, rather than for the RI.
so the second part of the RI is the one that can be done first.


The third type of RI loops the route to make the gimmick more subtle.
Using a Supp Style type of RI makes the gimmick less obvious,
because those who do not get the gimmick will not encounter the landmark for the part that acts like a Supp.
However, it is still relatively easy for experienced rallyists with maps
to figure out where they would need to turn to do the part that acts like a Supp.
From there, they can easily reverse engineer the gimmick.
Thus, the Supp Style type of RI is very similar to the Same Route type of RI in practice.
 
Using a Looping type of RI makes the gimmick even less obvious.
Rallyists who catch the gimmick will follow a different route than those who don't.
Rallyists who catch the gimmick will follow a different route than those who don't.
Neither RI part will refer to the turn for the gimmick.
Neither RI part will refer to the turn for the gimmick,
Often, those who miss a gimmick will never see the landmarks used in the RI part for those who got the gimmick.
and often neither group of rallyists (those who get the gimmick and those who don't)
 
will encounter the landmarks used in the RI part for the other group.
Rallyemasters familiar with writing CM rallyes can use the third type of RI the way CM rallyes use Supp instructions.
One RI part use an instruction like CS or Observe, referring to a landmark past the gimmick location.
The other part gets rallyists who turn for the gimmick back on route in the most direct way possible
(e.g., "U at Smith, R 1st Opp).
In practice, this is very similar to the second type of RI.
The main difference is that those who miss the gimmick never encounter
the landmark used in the RI part for those who got the gimmick.


It is usually cleaner to let the two routes diverge temporarily.
Looping type RIs usually makes the rallye flow better too, because there is no need for a U-turn.
The two parts of the RI direct rallyists along different courses, which eventually rejoin.

Revision as of 17:08, 10 June 2010

Length

50 RIs are a reasonable (rough) length for an A-B rallye.

Looping

There are four main types of RI in an A-B rallye:

Same Location
Both parts refer to the same action(s), performed at the same location(s), and the rallyist must determine whether each part is valid.
Same Route
Both parts occur along the same route, but not at the same location, and the rallyist must determine whether the first part is valid.
Supp Style
One part occurs beyond a turn for a gimmick (typically using Observe or CS), and the other part acts like a Supp to get rallyists back on route (e.g., "U at Smith, R 1st Opp").
Looping
The parts occur along different routes, with the two routes eventually rejoining.

Simple gimmicks based on instructions that are invalid per the GIs (e.g., misspelled street names or words that "do not exist on signs") typically use either the Same Location or Same Route type of RI.

More complex gimmicks (especially those that have rallyists turn on specific streets) cannot use the Same Location type of RI. When they use the Same Route type of RI, they tend to be more obvious because one of the parts will refer to the same turn as the higher-precedence gimmick. Rallyists need to realize that they should do the turn for the higher-precedence gimmick, rather than for the RI.

Using a Supp Style type of RI makes the gimmick less obvious, because those who do not get the gimmick will not encounter the landmark for the part that acts like a Supp. However, it is still relatively easy for experienced rallyists with maps to figure out where they would need to turn to do the part that acts like a Supp. From there, they can easily reverse engineer the gimmick. Thus, the Supp Style type of RI is very similar to the Same Route type of RI in practice.

Using a Looping type of RI makes the gimmick even less obvious. Rallyists who catch the gimmick will follow a different route than those who don't. Neither RI part will refer to the turn for the gimmick, and often neither group of rallyists (those who get the gimmick and those who don't) will encounter the landmarks used in the RI part for the other group.

Looping type RIs usually makes the rallye flow better too, because there is no need for a U-turn.

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