After a turn in which a hoop point is scored any ball that is over halfway
to the next hoop to be played can be declared 'offside', unless
it got there
- as a result of the stroke just played: by it running the hoop or it being
peeled through, or by it peeling another ball through that hoop;
- by an opponent's stroke, for example by the red ball being struck
so that it knocks the opponent's blue or black ball beyond halfway to
the next hoop;
- by the striker's ball being deflected off an opponent's ball
to put the striker's ball beyond halfway to the next hoop.
If ball is offside, and is so claimed by your opponent, and you are asked to do
so, you must move the ball to one of two penalty positions - your opponent chooses
which. The penalty points are the half way points on each of the longer boundaries.
Your opponent may prefer you to take your turn from where your ball lies.