I made my favorite hobby to decrypt itineraries post on FT with incomplete info

OP, is it correct you fly on a Saturday, arriving GVA at 11.05 on A3, departing to PEK on 12.20? If that's the case, then there is no earlier flight to GVA (A3 is the first one), let alone the connection from CFU (which needs to be the first flight of the day so as to connet to GVA). You will be at the mercy of the check-in agent in CFU (who also might not be that used to such complex situations), therefore you might want to start looking for alternatives to arrive GVA the day before if possible.