In 2v2 the common tactic to start things off is map control to allow you to divide your opponent and create 2v1 battles. If we have lings and stalkers between ur choke points we can hit and run attack from base to base. Then eventually push. Zerg speedlings are the #1 unit for map control and scouting, without doing that you leave yourself open to tactics such as cheese and teamwork play.
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