Removed rocks
Rocks will be removed from the rink if- they touch the sideline
- they travel beyond the backline
- they does not reach the far hogline
Guard rocks
Rocks in the free guard zone cannot be removed by an opponent's rock until the first four rocks (2 for each players) had been played.
If such guard rocks are removed in the first four throws, they are replaced to their original position, and the opponent's rock is removed from play.