“Problem is, in a KJF, Japan’s fighting so desperately not to loose their fleet they won’t recover Borneo and New Guinea.”
Disagree. J1, Japan either wipes out the UK fleet or Pearl Harbor (agreed?) Regardless of which Japan chooses, it will take time for the Allies to build a serious naval threat to Japan. Japan doesn’t have much to do with its battleships except escort transports and use amphibious assault shots (which go together nicely).
Against a KGF with no US in the Pacific, I’d grab Borneo back on J3 at latest. (J1 build transports and tank(s), J2 build more transports and infantry/tanks. If UK built an IC on UK2, the J1 transports retake Borneo on J2. If there’s no IC on UK2, J2 transports retake Borneo.
Against a KJF with heavy US fleet, I’d move the Japanese fleet closer together on J2 and start using double support shots plus heavy fighter escorts, with a couple fighters and a bomber assisting in Asia, along with transports in the sea zone west of Japan / at French Indochina. It’s very difficult for the Allies to take out an early combined KJF fleet, and with the additional forces in the area, Borneo can easily be retaken.
I believe that a UK attack on Borneo is possibly disastrous, and at best offers a passing distraction to Japan at the cost of the UK Pacific/Indian forces. The carrier, transport, and Indian fighter are all locked into place near Borneo. Also, sending 1 destroyer against 1 transport offers a decent chance of failure for a very important battle.
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“Now, it should be noted that if Japan is smart and only hits Pearl with 1 SS, 1 DD coupled with fighters and bombers so there’s no loss of capital ships, I recommend going to Europe with America.”
Well, there is a UK counter to prevent that. If you use the Australian sub and Indian fighter to attack the Japanese sub at Solomons, and land the fighter on the US carrier at Pearl, that means less fodder for the Japs, and a harder hit for the Allies. You can also run the UK transport to New Guinea, which forces Japan either to use a fighter vs transport (which is risky for Japan, and ties up a valuable fighter that first turn which means even less hitting Pearl, or means less hitting Asia, either of which will help a KJF). Or Japan uses two fighters, which is even worse for Japan.
Or Japan uses the East Indies battleship to attack the UK transport, leaving the Japanese carriers alone with their fighter escorts alone at the Solomons (Japan will probably be forced to move at least one carrier to the Solomons to take on fighters from the Pearl battle). Now, with no battleship at the Solomons, the US can possibly attack with Hawaiian island fighter, battleship, transport and either press on or retreat, if forced to retreat, the Japanese may be sucked into the US1 naval build in hopes of killing that US battleship (if the Japs don’t pursue, the US keeps the battleship).
Of course, that’s moot if the Japs can just use the battleship at east of Japan to reinforce the Solomons, which is why a UK bomber is so handy. If you’re stuck on reclaiming Anglo-Egypt, you could run the Indian fighter to Anglo-Egypt after all, and use the UK London bomber at Egypt as well, then land both fighter and bomber in Italian East Africa, where the bomber would still threaten the sea zones off Japan with a strong USSR presence in Burytia giving the UK bomber a place to land. OR, if you want to stick with the naval KJF plan, just fly the UK bomber east to China, where it can attack then land in Yakut (it’s hard for Japan to crack Yakut early), or possibly to Novosibirsk if you wanted to try to hit the German Baltic fleet.
(edit) To be clear, if you have the UK bomber as a threat, then any Japanese transport builds on J1 have a hard time surviving. If Japan leaves a group of transports completely unescorted, they’re bomber bait. If Japan keeps a battleship to escort, it runs into the problems outlined above. (no battleship at Solomons, or fewer fighters at Pearl). (Of course, I assume both Japanese carriers must go to Solomons). If Japan builds only two transports and an IC, and puts one transport west of Japan and another east, bomber vs single transport is likely good for the Allies. If Japan builds three transports and puts them together without any escort, that’s a potential disaster for the Axis.
On the other hand, if Japan tries to take Pearl with capital ships, avoiding most of the pitfalls above, the US can counter more heavily.