As the curling thread is closed?!?! @Rich
https://www.cbc.ca/sports/olympics/winter/curling/curling-canada-changes-guidelines-return-to-play-1.5640521
The most notable changes involving game play include the use of one sweeper during games, no sweeping the opposition's stone behind the tee-line and new markings on ice for non-throwing team members to be stationed.