It has taken some effort but I have managed to find out the information!
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In the MSN Bridgeclub on the Zone there are some restrictiions on allowed systems. They are jolly difficult to find because instead of having a helpful heading like "Permitted conventions" or something you have to look at the Alert Chart and they are at the end!
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Brown Sticker conventions are not permitted. It goes on to describe Brown Sticker conventions, so for details I should take a look for yourself, but anyway that means RCO openings are not allowed in the Bridgeclub.
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The website is at
http://www.msnbridgeclub.com/default.htmand you should look for the alerting rules.
If you play in the Zone generally,
NOT in the Bridgeclub, then there are no restrictions on what you may play.
I hope this helps!!!!!