Arrow-switching in Mitchell Movements
If you are running a Mitchell movement and you require one winner, then you need to arrow-switch in certain rounds. Usually, playing less than 8-tables, the last round only is arrow-switched. For more than 8-tables, arrow-switching should take place in multiple rounds.
Arrow switching is mentioned in all movement books, as well as at the following sites - have a look:
David Stevenson's site
Ecat's recommendations in running Simultaneous' events
"Sometimes the movement is such that the North South pairs stay put and the East-West pairs remain East West throughout. In this case the results for the East-West pairs and the North-South pairs are separate, and there are two winning pairs. To enable all the pairs to be placed in a single ranking order, the last round is sometimes played with an arrow switch. This means that the players who were previously North-South play the East-West cards for that round and vice versa." from http://www.pagat.com/boston/bridge.html
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