Other Treatments
In most strong club systems, the opening bid of 2♣ is natural and promises a hand with long clubs (for example, in both Precision and Blue club, it shows 11-15 high card points and either a 6-card club suit or at least a 5-card club suit and a 4-card major suit). As such, it makes overcalls more difficult, since they have to be made at the two-level. Chances are therefore increased that the side of the opener has an undisturbed auction, and the opponents won't discover a fit in a major suit. However, as a corollary, their strong 1♣ opening bid is more susceptible to preempting by opponents.
Another variant advocates two strong forcing openings, 2♣ for strong hands with fewer than four spades and 2♦ for strong hands with four or more spades.
Read more about this topic: Strong Two Clubs