Today IM Rensch finally opens the "can of worms" that is the Open Sicilians, and with that, all the glorious Pawn Structures therein have come spilling out! The Sicilian remains among the most complex, dynamic and commonly frequented openings at the highest levels of play. Mastering the formations associated will be no small task! Fear not Chess.com members, for your guide is here! Aren't you glad you enrolled in Pawn Structure 101?