A back throw (後投げ, Rear/back throw; commonly abbreviated as b-throw or Bthrow, and referred to as ThrowB internally) is a throw performed by tilting the control stick opposite to the direction the character is facing after having grabbed the opponent.
Back throws rarely lead to combos, but typically have good knockback (often more than forward throws) and thus can be used to set up edgeguards or KO opponents near the edges of stages. In Smash 64, all back throws have very high knockback and are viable KO moves, a trait that carries over to many back throws in future games.
List of back throws
Back throws with hitboxes consist of two or more hits on the grabbed opponent (the hitbox, then the throw), and can affect other opponents near the thrower. Additionally, some back throws may possess a collateral hitbox, which affects nearby opponents but not the victim of the throw. Unless stated otherwise, all back throws have the attacker put the opponent behind themselves in some way.
Notable back throws