Legal regulations are determined at a state level; entry submissions must meet this minimum in order to comply.
In the state of Colorado, a minimum of three (3) picks are required when submitting a Champions entry. If, for any reason, your entry is reduced to a Pick 2, the entry will still be valid for those remaining selections, given that it is a valid entry (both picks are not from the same team). Please see "Lineup Restrictions" for more information on this here.
Additional information on Pick'em Champions can be found here.