The major difference between regular curling and mixed doubles curling is the positioning of two stones – one per team – that are set before the beginning of each end. These “positioned” stones that are placed before the beginning of each end are also eligible to be counted in the scoring.
In a new term, the team with the ‘hammer’ or last stone advantage now has the option. That option is which stones to position where. Teams can decide to put their stone in the back four foot and the other team’s stone as the centre guard. If you choose this option, the opposition would deliver first in the end. If you choose to put your stone as the guard, then you would deliver first.
Here is the positioning (figure no. 1). There are three positions for the centre guard depending on the amount of curl in the ice. The more curl, the closer to house you would position the guard.
Power Play Option
This option can be used by each team once in an 8 end game when they have the decision on the placement of the “positioned” stones – but never in an extra end. (Curling rinks can allow unlimited use if they choose.)
The in-house stone, which belongs to the team with last stone in that end, is placed with the back edge of the stone abutting the front edge the tee line, with half the stone in the 8-foot and half in the 12-foot circle.
The guard stone is positioned to the side of the sheet, so it would be bisected by a direct line between the middle of the in-house stone to the middle of the hack.
The distance of this corner guard from the house will be the same distance that was determined for the centre guards.
Each team shall deliver five (5) stones per end. The player delivering the team’s first stone of the end must also deliver the team’s last stone of that end. The other team member shall deliver the team’s second, third and fourth stones for that end. The player delivering the first stone can change from end to end.
Modified Free Guard Zone – No stone in play, including the “positioned” stones and those in the house, can be moved to an out-of-play position prior to the delivery of the fourth stone of an end (the fourth delivered stone is the first stone that can remove any stone from play). If there is a violation, the delivered stone shall be removed from play, and any displaced stone(s) shall be replaced to their original position by the non-offending team.