[JimMorrison]

It's important to note - the game autosaves when you End Turn. It runs SP the same way that it runs PBEM, so when you End Turn, it generates a file to "send to the host", and then it "hosts the game".

If you End Turn too early, you can then quickly close the program, reload and select "Continue From Where I Left Off", and your turn will be as it was at the exact moment that you hit End Turn.