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From Wookieepedia: The Star Wars Wiki http://starwars.wikia.com/wiki/Form_III:_Soresu
Form III: Soresu, also known as the Way of the Mynock, or The Resilience Form, was the third of the seven classic forms oflightsaber combat that was recognized by the Jedi Council prior to and during the Clone Wars. Soresu was developed during the widespread emergence of blasters as an offensive weapon. Essentially a development on Form I blast-deflect training, Soresu relied on tight bladework and subtle dodges to provide maximum defensive coverage, minimizing exposure to ranged weaponry. Over time, Soresu transcended this basic origin, and came to be considered the ultimate expression of non-aggressive Jedi philosophy.