Surrender of a major power

[klschult]

What influences surrender?

I believe its a function of National Morale, capture of a HQ, and number and value of units remaining, but what is the algorithm/value of each component.

I'm trying to get UK to surrender with capture of London, Manchester and Edinburgh without moving the HQ to Toronto. It looks like I'm going to have to take Egypt as well and eliminate all units in Egypt and Great Britain.

Alternatively, is there any way to get GB to surrender if the capital has moved to Toronto?

[BillRunacre]

An explanation is given in the Manual on page 74 under Surrendering Nations, complete with the formula.

In answer to your further question, if the capital is at Toronto then British National Morale would have to be zero for them to surrender, which is unlikely.

[klschult]

Thank you.

Of course the first manual I found ended at page 71 ...

But I will persevere.

[klschult]

"Major Country Surrender = 3% * number of remaining units within the home country"

I'm surprised this mechanism has nothing to do with National Morale, but I'm ok with it.

I assume units in Egypt are not "in the home country."?
Ships in a home country port?
Ships at sea?
Gibaltar and Malta?

So if I eliminate all units on Great Britain and Northern Ireland, including ports, then the chance of surrender when I take the last capital (of the 3) is 100%. If the garrison of Northern Ireland is intact, then the chance is 97%.

Or 91% if Gib and Malta count, but I can't build there so maybe not.

[klschult]

I did a test.

It appears that Gibraltar and Malta are considered "home country." Including them led to a 70% probability of surrender and I got surrender in 7 of 10 cases. Still could be random noise, but it doesn't look like it. No prediction on Cyprus being included.

Naval units at sea and units in Egypt are not considered in the calculation. Each had 10 or more units which would have led to a 40% prediction.

[BillRunacre]

Yes, any territory that when you hover over it says it is "UK" is home territory as far as this test is concerned.

[klschult]

Aha! Thank you.