This is scenario from the human-vs-human wargame. POD: In summer 1941, operation Barbarossa has failed catastrophically due combination of German inept strategic command and strategic blunders related to war production. By December 1941, Soviet forces were on the eastern outskirts of Germany proper. Pearl Harbor never happened, instead the Japan was drawn increasingly closer to US side. The Allied support for Soviet Union rapidly faded, as increasingly over-confident Red Army rolled country one after another, with the agenda of world revolution. By March 1942, everybody was against Soviet Union, who had by that time overrun Berlin, Rome, Zurich, Istanbul, Alexandria, Tehran, Seoul and most of China. While front-lines in Europe has eventually stabilized (with now German-allied British forces nearly openly firing artillery barrages over the heads of remaining German troops in remaining thin strip of Germany proper), the Soviet Union leadership has decided to switch focus to Eastern Front - to knock Japan out of war. In late May 1942, Red Army, mustering improvised naval transports capable to carry ~4 million infantry, and with cargo holds large enough to fit about 1/3 of these infantry`s vehicles and artillery, has launched a massive amphibious invasion to the Honshu island, with spearhead at Maizuru. The Red Army is supported by massive and well-experienced air force of roughly 30,000 aircraft (Pe-3, LaGG-3, MTB-2, Il-4 etc.) but Soviet Navy in Pacific is completely annihilated. IJN also got heavy losses. Only one battleship (Yamato) is combat-ready, as well as recently completed aircraft carrier Hiyo. Four more battleships (all heavily damaged) are docked in Tokyo Bay and are under repair, and 6 aircraft carriers (all heavily damaged) are under repair in Nagoya bay. Japanese cruisers are all either destroyed or too heavily damaged to leave ports - mostly due Soviet torpedo bombers. Also, about 20 IJN destroyers of all states of damage are more or less seaworthy. Finally, ~35 ocean-going submarines and ~80 midget submarines are available. Japanese air forces are in severe disarray after failed defence of Manchuria and Korea. About 10,000 of modern aircraft (A6M, Ki-43, Ki-45, G4M, Ki-21, Ki-49, H6K) are available, but almost no pilots has survived. Home islands defences of IJA consists of approximately 1.5 million soldiers, with approximately half been assigned to coastal defense sectors with all available artillery. Regardless of plausibility of such disposition (i assume the situation is impossible IOTL for several reasons) could anybody provide the forecast of such a conflict?