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1.
The Field -- A rectangular shape with endzones at
each end. A regulation field is 70 yards by 40 yards,
with endzones 25 yards deep.

2.
Initiate Play -- Each point begins with both teams
lining up on the front of their respective endzone line.
The defense throws ("pulls") the disc to the
offense. A regulation game has seven players per team.
3.
Scoring -- Each time the offense completes a pass in
the defense's endzone, the offense scores a point. Play
is initiated after each score.
4.
Movement of the Disc -- The disc may be advanced in any
direction by completing a pass to a teammate. Players
may not run with the disc. The person with the disc
("thrower") has ten seconds to throw the disc.
The defender guarding the thrower ("marker")
counts out the stall count.
5.
Change of possession -- When a pass in not completed
(e.g. out of bounds, drop, block, interception), the
defense immediately takes possession of the disc and
becomes the offense.
6.
Substitutions -- Players not in the game may replace
players in the game after a score and during an injury
timeout.
7.
Non-contact -- No physical contact is allowed between
players. Picks and screens are also prohibited. A foul
occurs when contact is made.
8.
Fouls -- When a player initiates contact on another
player a foul occurs. When a foul disrupts possession,
the play resumes as if the possession was retained. If
the player committing the foul disagrees with the foul
call, the play is redone.
9.
Self-Refereeing -- Players are responsible for their own
foul and line calls. Players resolve their own disputes.
10.
Spirit of the Game -- Ultimate stresses sportsmanship
and fair play. Competitive play is encouraged, but never
at the expense of respect between players, adherence to
the rules, and the basic joy of play.
References
http://www.cs.rochester.edu/u/ferguson/ultimate/ultimate-simple.html
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