Sai tok

In lightsaber combat, a sai tok, frowned upon by the Jedi because of its Sith-like nature, was the act of cutting an opponent in half, usually separating his or her legs from the torso at the waist.

It was performed by Jedi Padawan Obi-Wan Kenobi to defeat Darth Maul in his duel against the Sith Lord during the Battle of Naboo.