When your main time flag falls you are in overtime, and you carry out the following procedure for Canadian Overtime:
Ask your opponent to stop the clock and to reset yours to 5 minutes to 6 o'clock.
Without delay, count the 15 overtime stones from your bowl.
Cover your bowl with the lid. (Prisoners should be transferred to another lid).
Then restart the clock.
Play all the overtime stones before the flag falls.
If you pass, hand an overtime stone to your opponent, then press the clock.
If you use all your overtime stones, immediately repeat the procedure from point number 1.
Spectators must not comment on any aspect of the procedure, but should call the referee if they notice anything amiss.
You may not stop the clock to capture stones, even in overtime.
The referee may intervene if the overtime procedure is not properly observed.