In games with big bids for the Allies (35+ PUs), it is possible to hold Yunnan by adding in an additional Chinese art plus flying in an additional two or three Russian planes that were bought before the game started. If Japan pushes all of their units to Kwangsi on J1, the Allies will have to vacate Yunnan before J2 or face annihilation. However the Chinese can counterattack or strafe Yunnan on Ch2 since the Japanese air force can’t land in that territory, seriously harming Japan’s ground strength in Mainland Asia.
Russia will have to methodically retreat back towards Moscow for the first three rounds with this plan. The upside in Europe is that the US can execute a KGF plan since there is less urgency in the Pacific theater.