One ring...

As you may have read, keeping the chain on the front ring of your 1x9 or 1x10 setup is not easy in bumpy conditions. Nippleworks has been futzing with it for two seasons of cross racing now. Read about it here, here and here. Well, James Huang @ Cyclingnews tackled the problem head on in a good article that covers most of the available options including some innovative homebrew stuff.