World Rugby Laws - World Rugby's Law Education Web Site: Law 11: Knock-on or throw forward
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    11 Knock-on or throw forward

      Knock-on

    1. A knock-­on may occur anywhere in the playing area.
    2. It is a knock-on when a player, in tackling or attempting to tackle an opponent, makes contact with the ball and the ball goes forward. Sanction: Scrum (if the ball goes into touch, the non-offending team may opt instead for a quick-throw or lineout).
    3. A player must not intentionally knock the ball forward with hand or arm. Sanction: Penalty.
    4. It is not an intentional knock-on if, in the act of trying to catch the ball, the player knocks on provided that there was a reasonable expectation that the player could gain possession.
    5. The ball is not knocked-on, and play continues, if:
      1. A player knocks the ball forward immediately after an opponent has kicked it (charge down).
      2. A player rips or knocks the ball from an opponent and the ball goes forward from the opponent’s hand or arm.
      Knock-on
      Charge down

      Throw forward

    6. A throw forward may occur anywhere in the playing area. Sanction: Scrum.
    7. A player must not intentionally throw or pass the ball forward. Sanction: Penalty.