Rugby.

Rugby has the speed of basketball, the contact of
football and the strategy of chess. It is played by
two teams of fifteen players with six substitutes
controlled by a referee and two touch judges. It is
played in two 40 minute halves on a grass pitch
(field). Each half starts with a kickoff, where the
ball is placed in the middle of the pitch and one
team kicks to the other. The clock never stops,
but any time taken for injury is added on to the
half in which it occurs. The object is to score more points than the
other team by carrying, passing, and kicking the ball. A rugby ball is similar
to a football, but is bigger and has rounder edges
groups, forwards and backs.
(The following diagrams show the players’
positions during scrum down.