To expand on what the previous posters have said, playing solo a strategic-level game that covers several years of WWII poses the major problem that such a game involves long-term planning…and you can’t hide each side’s long-term plans from yourself if you’re playing both sides.
There are ways, however, of managing this when you’re playing a regional-level game that focuses on a single large campaign in which one side is basically the attacker, one side is basically the defender, and the game is played as on a “use what you’ve got” basis with no unit purchases. Something roughly on the scale of the A&A games D-Day or Guadalcanal or Battle of the Bulge, though of course you can use the same technique for other campaigns.
Here’s the basic technique I’d suggest, using as an example the Eastern Front in mid-1942 (and therefore using just part of the Global 1940 map board). Historically, mid-1942 was a time when the front had more or less stabilized during the fighting over the course of the previous months; the Germans were building up for a summer offensive, but unlike what had been the case during Barbarossa the previous year they were not strong enough to attack along the whole front. (In real life, they decided to strike towards Stalingrad and the Caucasus region. We all know how that turned out, but that’s not what this example is about.) The Russians, for their part, had managed both to halt Barbarossa and to drive it back to a certain extent in late 1941 and early 1942, but by the spring of 1942 had reached pretty much the limit of what they could do with the limited resources they had at the time.
In the scenario I’m using as an example, you’d be playing both the German side and the Russian side. Both sides know that the Germans are the ones who are going to go on the offensive, and thus that the Russians are going to be in the role of the defender. (In 1941, 1942 and 1943, the basic pattern was that the German offensives occurred in the summer and the Russian ones in the winter.) The two questions both sides have to consider are thus: where along the front is Germany going to attack, and therefore where should each side concentrate the bulk of its forces?
Let’s assume, as part of the game scenario, that Germany has three options: launch an offensive against Moscow alone, launch an offensive against Stalingrad alone, or launch simultaneous offensives against both cities. In the first step of the solo gaming process, you take the role of the German general staff and you basically work out three force-allocation plans, meaning one for each of the three offensive options I’ve described. Let’s say that Plan A will be the Moscow-only offensive, Plan B will be the Stalingrad-only offensive, and Plan C will be the Moscow-and-Stalingrad dual offensive. There’s no decision about which plan will be used (we could imagine, for example, that Hitler hasn’t yet made up his mind), but the details of the force allocations for all three plans do get locked down at this stage. Plan A, for example, might involve placing so many tanks in such-and-such a territory prior to the attack, and so forth. Once the three plans are drawn up, you’re committed to their details and they can’t be changed.
That’s step one. For step two, you now switch sides and become the Russian general staff. Your intelligence services have informed you that the Germans are preparing for an offensive, and they’ve provided you with stolen copies of Plan A, Plan B and Plan C. You know exactly what the force allocation details are for each of the three plans (because you yourself worked them out in step one when you were playing the German side), but you don’t know which one of the three plans will be implemented (because Hitler hasn’t yet decided which one to use). As the Russian player, you now have to decide where you will position your own forces in order to meet the upcoming German offensive, whose location you don’t know. Will you position the bulk of your forces in front of Moscow? That would be the best possible move if the Germans end up using Plan A, but the worst possible move if the Germans end up using Plan B, and only a partially-good move if the Germans end up using Plan C. Will you position the bulk of your forces in front of Stalingrad? Again, the wisdom of that option will ultimately depend on which plan the Germans use. Will you split your forces between Moscow and Stalingrad? That’s arguably the best option for countering Plan C (if that’s what the Germans end up using), although a counter-argument would be that if you concentrate on defending either Moscow or Stalingrad you’ll end with a split result if the Germans use Plan C: a more or less guaranteed Russian victory at one city and a more or less guaranteed Russian defeat at the other city.
Anyway, the point is that in step 2 you have to commit yourself, as the Russian side, to one particular defensive strategy, with its force allocation details worked out and locked down ahead of time.
Now we get to the final step before the actual campaigns starts: Germany decides which of its three plans it will actually use. This has to be done randomly because, if you were given the opportunity to switch back into the German role and make the decision yourself, you couldn’t avoid being influenced by your knowledge of the defensive dispositions to which the Russians committed themselves in step 2. (You didn’t have that knowledge when you were doing your step 1 planning because step 2 hadn’t taken place yet, but you do have that knowledge now that you’re at step 3.) Step 3, therefore, simulates (via a dice roll) a situation in which Hitler makes his final decision (implement Plan A or Plan B or Plan C, none of which can be changed) in one of three sets of circumstances
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German intelligence is in the dark about where the Russians have positioned their forces, and therefore Hitler basically takes a guess and makes his decision on the basis of that guess. A random dice roll which happens to select the perfect plan for the situation would represent a good guess by Hitler, whereas a bad guess by Hitler would correspond to the other dice options.
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German intelligence has good information on the Russian defensive force dispositions and makes a good recommendation to Hitler, and Hitler sensibly chooses the right plan for the situation. This would be what a good plan-selection dice roll would represent.
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German intelligence has good information on the Russian defensive force dispositions and makes a good recommendation to Hitler, but Hitler dismisses their recommendation and chooses the wrong plan for the situation. This would be what a bad plan-selection dice roll would represent.
Steps 1, 2 and 3 having been completed, you then set up the opposing forces on the board using the German offensive plan to which you’re committed and the Russian defensive plan to which you’re committed – and then you fight out the campaign and see who wins. Even before the fighting starts, however, you’ll probably be able to take satisfaction of either having been successful as the German side in setting up an attack where the Russians didn’t expect you, or take satisfaction as the Russian side in having correctly anticipated where the Germans would attack.