Thank you for your feedback gentleman, let me start off to explain my situation.
I play with my father and brother 2 or 3 times per year and enjoy this game so much! Personally I get a lot of joy out of trying to figure new strategies and optimise them build on feedback from the forum. We are definately not experienced online player but play the game some 10 years now and have a lot of fun playing it (10-12 hours gaming, crazy haha)
I tried the online game but I prefer to play it face to face as you have the laughter, the excitement and the beer together. So unfortunately I will not be able to test my strategies against you for now, maybe on holidays or something I will try again.
Hopefully this will not result into you abondoning giving feedback as it is so greatly appreciated :)
Back to the strategy:
The idea is to win for Japan in the Pacific, so Honolulu and Sydney as VC. With J1 it is easy to force the Allies into defensive modus and especially the UK can be neutered early on, while USA is most dangerous ally. Both China as Russia are unable to contest the seas of the Pacific.
You take Hawaii in J2, but you do not defend it, you move on to Sydney. You can try to take it in J4 and forgo the islands, but I prefer to do it J5 and focus on getting the islands first as these are a hell for the Allies to retake while add crucial income.
The USA can therefore take Hawaii back in USA3, but it will lag behind the Japanese fleet 1 turn so is not able to help defend Sydney on time.
In case you do you J1 and manage to kill the UK battleship + ANZAC destroyer and transport with your own destroyer the pacific is only defended by
UK: cruiser, destroyer
ANZAC: cruiser
While Japan still has
1 battleship, 1 cruiser, 1 destroyer, 2 submarines.
It can take casualties against philipines fleet or battleship though. So luck is indeed important in how much you are able to keep after J1 attacks.
So in J1 I take Borneo. I will also try to save the cruiser against the BB attack. In my J2 I might have that transport + 2 philipines transports plus Japanese fleet (bb, cr, dd, 2 sub minus casualties) + bombers and maybe some aircraft from siam to attack possible allied fleet protecting. UK can attack Borneo transport that will delay the conquest of the money islands but I think the odds are still in my favour even with main fleet at hawaii?
In any case if UK or ANZAC contest the islands, they lose their fleet next turn by Japanese counter-attack and because of their limited income they will have difficulty of recovering fast.
Japanese has 3 transports, build 3 more in J1 and another 2 in J2 so I will be able to respond where I am needed. The defence perimeter 5IPC bonus is nice, but in case the money islands are contested I can send my J1 buy transports to the money islands instead.
J1: 3 transports, 1 artillery
J2: 2 transports, 2 artillery, 2 infantry, 1 minor on FIC
J3: dependent on situation, stack FIC
If the Allies are more defensive as response to the J1 devastation it will be easier to reign the pacific ofcourse. Especially that destroyer vs destroyer battle for ANZAC is a really important one, as it takes out the transport and forces ANZAC to rebuy it in his first turn. All the fleet buys are great as I plan to take Sydney in J5.
In best case scenario (UK does not attack borneo transport)
J1: pearl harbour, borneo, philipiness + extra
J2: hawaii, money islands
J3: malaya, defence perimeter islands
J4: quensland
J5: sydney
J6 onwards: back to hawaii again
So what about UK and China? Well FIC will ofcourse prove crucial here and I can add another minor on Malaya as soon as I get it. I will push against China and then be forced to retreat, if I play it wise I can retreat in time in order to keep China contained while it grows back again. Those 2 infantry with artillery per turn from J3 onwards will ofcourse be really good. Even when China will overrun me, I will be a juggernaut and can attack anywhere at the coastline with several transports.
Same for Siberian forces, I need to contain them, so not lose my head and send all troopa into China. Defend the border with 8 inf and several fighters.
UK, I want to get 2 subs before India convoying it. Combined with UK having lost Borneo, Kwantung and Malaya it will not be able to push hard, especially when FIC is healthy fortified.
In any case, using Pearl Harbour as Japan strategy will result into a very fleet centered Japan so lots of navy builds and likely a massive fleet battle against the USA along the road.
EDIT: I realized an even better alternative. After Sydney go on to India. USA will likely defend Hawaii heavily as soon it retakes it, so taking Calcutta instead might be easier. You can decide at J5 though based on the situation.
What you did with the Pearl Harbour is to keep the USA out of the game for at least USA4 because it will have to rebuild, only builds warships in USA1+2 and start building + advancing from USA3 onwards but when he want to combine it lags behind a turn. In all this time you were expanding as Japan and taking over the pacific islands.
Therefore the rationale behind this strategy is that all the Allies can be contained with minimal troops while USA is the Allied wildcard and by going in hard vs hard you negate this.