I may very well be reniventing the wheel here, but it is a new idea for me, I haven’t seen it posted before, and it may help someone else:
Consider seriously running away from your capital if it looks like the next turn it will be taken (even taking into consideration the units you build this turn).
The reason why is based on an old principle that you don’t want to lose more unit value than the enemy does in a battle. For instance if Russia has 30 inf in Moscow and the Japanese have an assorted offense of 20 inf 11 arm 6 fig 1 bom, it is probably a good time to run the hell away with the 30 inf, and spend whatever income you have that turn to research rockets or just use it up to build a few land units so the Japanese don’t get that extra cash.
That battle usually results in the Japanese winning soundly, which could easily turn the game around in terms of both economy from the capital taken and that the Japanese take out more IPCs of units than they lost.
If you run away though, those 30 Russian inf could be very helpful down the road as the other 2 Allies take down Germany and now need to overcome a monstrous Japan.
The point could be put simply - if it looks probable you’re going to lose your capital, do the smart thing and don’t lose both your capital and a lot of troops at lower cost to the enemy; just lose the capital and save the troops for later.
Or if you like to think of things in TUV (total unit value), you don’t want the offender to make a net gain on TUV over your team if you can help it, so sac the capital today and keep your TUV edge to help out later, instead of fighting a losing battle and giving the enemy the long term win.
This may not be an option normally, and you should indeed try to hold your capital for as long as possible for obvious reasons as Germany/Russia. This tactic might generally work better for Russia as Germany usually wants to wait it very long, using its massive defenses against split attackers, but in any case keeping the idea in the back of one’s mind is a good thing.
Any thoughts?