Rules:
At the start of each end, two rocks start in play — one in the back half of the button with the front of the rock at the very center of the house, and a rock of the opposite color guarding on the center line, halfway between the front of the house and the hog line. Five rocks are played per team, with scoring performed as normal. One thrower must throw the first and last stones of each end, while the other thrower must throw the three in between.
There is an additional concept, known as the option, given to one of the teams. The option is given to the team which did not score in the previous end (or randomly determined in the first end), and switches teams in the event of a blank end. The team with the option has the option to select which of the two rocks in play is theirs, with the hammer going to the team with the rock in the house.
Mixed Doubles
The first World Mixed Doubles Championship took place in 2008. Instead of the normal four players, two players– one woman and one man will compete for each team. The idea developed from the mixed doubles event at the Continental Cup of Curling. There was an attempt to make the event part of the Olympics.
source: wikipedia.org
