From: BJ <job@nag.cs.colorado.edu> (now invalid)
Subject: By the Way, Not the Name
To: footbag@footbag.org
Date: Tue, 31 Oct 1995 02:16:38 -0700 (MST)
Here's some food for thought... Feedback is welcome, particularly in regard to
the names in the list. Try the "complete" list...
Benjamin Job
A List By the Way
This paper presents a notation for describing footbag tricks and
representing the relationships that exist between them. Additionally, it
presents the means for generating a comprehensive list of possible
variations.
Break a trick down. You get a series of movements preceeded by a set and
followed by a catch (or kick). The set and catch options are few and easily
listable. The series of movements, though allowing of more variation, are
similarly listable. Represented as a formula, this information provides us
with the means to logically generate trick variations. As the precision of
the formula increases, that is, as more of the finite number of basic movements
are incorperated into the formula, we approach the specification of every trick
possible. Consider the following:
(toe | clip) >
[(same | op)(in | out)dexterity]* >
(same | op)(toe | clip)
The notation is as follows: "Same" and "op" are always relative to the leg
previously refered to. "In" and "out" mean "inside" and "outside", respec-
tively. "|" is equiv. to "choice" ("or"). "[ ]" means "enclosed dex is
optional". ">" is equiv. to "followed by". "*" means the preceding term can
occur/re-occur 0 or more times.
From this simple formula, most non-modified leg dexterities can be derived.
Because of the structure of the formula, a "truth table" of moves can be gen-
erated, leaving no move undiscovered (ex., see list).
Some examples:
clip > op clip Clipper to Clipper
toe > op in dex > op toe Mirage
clip > same in dex > op out dex > same toe Paradox Dbl Legover
clip > op in dex > same in dex > op out dex > same toe Flurry
How far can we go? Only slight modifications are needed to account for
other modifiers and their associated possibilities. For example, Pogo,
Symposium, Spinning, ang Gyro moves can be formed by adding "(no plant while)"
and "(forward | backward)spin". The formula,
(toe | clip) >
[(no plant while)]
[(same | op)(in | out)dexterity | (for | back)spin]* >
(same | op)(toe | clip)
describes variations such as:
clip > (no plant while) op in dex > op in dex >
(no plant while) op in dex > op toe Pogo Paradox Symposium Blur
The set and catch options can be filled in with all the choices: inside,
outside, knee, the unsual surfaces. What elements that may comprise a trick
have yet to be accounted for? Just a few: stomping ["(both legs plant)"],
blind, hop-over, carry (Wrap), duck, dive, jumping/flying, Swirl/Twirl cross-
body dex, swing (Pendulum, Rake). Not many other types of primitive movements
exist. Since the acceptable tricks are just combinations of these primitives;
and since each primitive may be easily implemented within the formula; the
the possibility of a master formula for all tricks becomes complete.
Note: "same", "op" and "no plant" are relative to the leg previously refered
to.
Examples:
clip > op in dex > op out dex > op clip Ripwalk
toe > same out dex > same out dex > op clip Double Over Down
toe > op out dex > op out dex > same toe Eggbeater
toe > (no plant while) > op in dex > op toe Symposium Mirage
toe > (no plant while) > op in dex > op clip Symposium Whirl
clip > same in dex > op in dex > op toe Pdx Blur
clip > same out dex > same out dex > op clip Barfly
clip > op in dex > same in dex > same toe Double Pickup
clip > op in dex > (no plant while) op out dex > op clip Dada Curve
clip > (back)spin > same in dex > op out dex > op clip Gyro Ripwalk
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