"Coaching during the game" - Rule change starting October 1st 2016

3.5.1.3 Players may receive advice at any time except during rallies provided that continuity of play is not affected (3.4.4.1); if any authorised person gives advice illegally the umpire shall hold up a yellow card to warn him or her that any further such offence will result in his or her dismissal from the playing area.

Effective date: 1 October 2016  

Find more information in the Frequently Asked Questions October 2016 document.