Originally Posted by
catharsis
I think you must be right my experience is the same.
Has anyone been able to identify this fare to any locations other than SIN?
The fare rule is ex-CH to SIN only. Looking at the list of exemptions, where OW flies (and that not all operate 4 cabins) and SIN's relatively western positioning, I wasn't able to find any eligible stopovers in Asia on Google Flights but perhaps someone can do better with a mixed cabin search with Power Tools.
PEK for CHF900 is available ex-ZRH, which is still decent for the departure airport, but obviously less for a pure MR.