The tournament organizers usually wait until all teams have teed off before randomly selecting the nine holes whose scores will be used.
Alternately, the organizers may select three par-3s, three par-4s and three par-5s, but that makes it easier on the field - concentrate really hard on the par 3s and par 5s because there usually are only four each of those on a golf course.
Blind Nine is usually played with full handicaps, but using three-quarter handicaps or some other fraction can help ease the logjam that is sometimes created by using only nine holes to score.
Compare to Arizona Shuffle, a similar format.
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