What if Yamamoto didn't died in 1943

Very little. One can't fight with what one doesn't have.

The best he can do is try and convince the Emperor the war is lost. They can try to get an honorable peace but I suspect the US would inflict some harsh terms...
 
They can try to get an honorable peace but I suspect the US would inflict some harsh terms...

No they wouldn’t. Unconditional surrender means no terms.

To the OP, not much. The Allies are in a position of supremacy by this point, and nothing can be done to change it. Though, why would they know their codes were broken?
 
What could Yamamoto have done differently in the war?
One thing is that the Japanese would know their codes are broken

Very little could be changed by that point, Japan had lost too many ships.

The code issue again meant less over time as there was increasingly little to keep secret. I would suggest that the Allies would have been able to crack a new code, so a change would likely have been only a temporary benefit.
 
No they wouldn’t. Unconditional surrender means no terms.

To the OP, not much. The Allies are in a position of supremacy by this point, and nothing can be done to change it. Though, why would they know their codes were broken?

The only problem is, the Aliies DID allow terms.
 
The only problem is, the Aliies DID allow terms.
No they didn’t. People think they allowed the Emperor to be kept as a term of Japanese surrender, but the treaty says otherwise. The Emperor was kept because the Americans decided he could be, not as a term for surrender.
 
Yamamoto would have gone all in on the defense of Saipan.
The Imperial Navy would have done the equivalent of a BANZI charge at the American fleet.
After the slaughter if he was still alive Yamamoto would pressure the Government to surrender , of he dies gloriously he will have left a message to be delivered detailing the hopelessness of Japan's position and Imploring surrender.
 
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Yamamoto would have gone all in on the defense of Sipan.
The Imperial Navy would have done the equivalent of a BANZI charge at the American fleet.
After the slaughter if he was still alive Yamamoto would pressure the Government to surrender , of he dies gloriously he will have left a message to be delivered detailing the hopelessness of Japan's position and Imploring surrender.

I think the suicide sortie at Saipan is likely. There is no way that Yamamoto survives it.
 
Yamamoto would have gone all in on the defense of Saipan.
The Imperial Navy would have done the equivalent of a BANZI charge at the American fleet.
After the slaughter if he was still alive Yamamoto would pressure the Government to surrender , of he dies gloriously he will have left a message to be delivered detailing the hopelessness of Japan's position and Imploring surrender.

Yamamoto was also a fan of complicated plans. I wouldn't be surprised if he tries to split the American fleet like he tried to do at Midway in this hypothetical battle at Saipan.
 
...

The code issue again meant less over time as there was increasingly little to keep secret. I would suggest that the Allies would have been able to crack a new code, so a change would likely have been only a temporary benefit.

Two books; 'Codebreaker in the Far East' and 'The Emperors Codes', both written by British codebreakers identify 27 known codes or encryption systems used by the Japanese. By mid 1943 25 of those had been penetrated by Allied cryptologists. But it gets worse. As the USN was preparing the next phase of the central Pacific offensive in early 1944 Phillipino guerrillas provided a copy of the Naval plans for defending the Marianas Islands. That is Nimitz, Spruance, and Halsey had in their hands the other teams play book, written by Yamamotos successor. The Marianas Turkey Shoot was in a large part the result of Spruance having this insight into the naval assets the Japanese expected to have and the commanders thinking.
 
Yamamoto would have gone all in on the defense of Saipan.
The Imperial Navy would have done the equivalent of a BANZI charge at the American fleet.
...

The Japanese admirals finally tried that in defense of Okinawa. They lost the Yamamoto and a squadron of cruisers and destroyers. They came close at Leyte Gulf, but a couple of their admirals were unable or willing to drive the attacks further.
 

SsgtC

Banned
The Japanese admirals finally tried that in defense of Okinawa. They lost the Yamamoto and a squadron of cruisers and destroyers. They came close at Leyte Gulf, but a couple of their admirals were unable or willing to drive the attacks further.
With Yamamoto personally leading them however, you may see those attacks pressed home with far more vigor.
 
They came close at Leyte Gulf, but a couple of their admirals were unable or willing to drive the attacks further.
What world do you come from where the Japanese "got close" at Leyte Gulf?

There were IIRC six major engagements at Leyte Gulf, and the Japanese got the shit kicked out of them in every single one. The most "successful" of the engagements was Samar which was still a crushing defeat.
 

SsgtC

Banned
And would have been promptly obliterated by the USN
No argument. The IJN would literally cease to exist after this. But the cost to the US would also be considerably higher than in OTL. Yamamoto wouldn't wait until his ship's were a work out as happened in OTL. He would have attacked while he still had the combat power to severely hurt the USN, buying time for Japan to negotiate a peace treaty.
 
What world do you come from where the Japanese "got close" at Leyte Gulf?

There were IIRC six major engagements at Leyte Gulf, and the Japanese got the shit kicked out of them in every single one. The most "successful" of the engagements was Samar which was still a crushing defeat.

I'm not clear what you mean here? Does getting ass kicked mean it was not a Banzai charge?
 
No argument. The IJN would literally cease to exist after this. But the cost to the US would also be considerably higher than in OTL. Yamamoto wouldn't wait until his ship's were a work out as happened in OTL. He would have attacked while he still had the combat power to severely hurt the USN, buying time for Japan to negotiate a peace treaty.

How many USN ships would have to be put out of action in 1944 to severely hurt the USN?
 
I'm not clear what you mean here? Does getting ass kicked mean it was not a Banzai charge?
Aw, oops. I misunderstood you. I thought you were talking in the usual sense of "getting close at Leyte Gulf", that is to say almost winning. I apologize for misunderstanding you.
 
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