Half Boston Crab (ハーフボストンクラブ Hāfu Bosuton Kurabu?) is a back throw exclusive to King I and King II from Tekken 2 onwards. Tekken 3 also introduced a ground throw version of this move but with lower damage than the back throw. Unlike a regular Boston Crab which utilizes both legs, with the Half Boston Crab, King grabs the opponent by only one leg and snaps it back with a lot more force, dealing over twice the amount of damage compared to the regular Boston Crab.
Gon has a variant of the ground throw known as Gon Half Boston Crab.
Gallery
King applying the Half Boston Crab to Nina in Tekken 2.