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You might as well try with what you've got, if the chain starts dropping then look for a new ring or guide...
If you need to buy a ring I'd go NW/retainer, my 29er was fine with just a NW ring, I did have a clutch mech but never turned the clutch on. Never dropped a chain over a lot of crappy Welsh bridleways or rocky Peak District descents.
atk
Hmmmm....
http://www.bikeradar.com/gear/article/workshop-how-to-convert-your-mountain-bike-to-1x9-or-2x9-gearing-29342/
So basically "take off the big and little rings, move middle ring to the inside of the spider".
Risk of chain drop if I don't use a chain guide or narrow-wide chainring?