From: Denver Colorado
How many prisoners have you taken?
You might have over-encircled the enemy.
In my experience, it is necessary to turn down Axis default settings to get a more historically accurate result.
Also, by setting things at 109 instead of 110, you deprived the AI of some bonuses that it probably really needs. I play the AI with German settings at 90 or 95 (possible exception of morale, which you may want to keep at 100), and I set the Soviet AI to 115 on everything except fortification (which I set at 120).
It is normal for the area from Rostov to Vorenezh to be largely undefended in the later turns of your 1941 summer. It won't last forever, believe me! By Fall there will be armored brigades and infantry everywhere swarming you back to Stalino...
However, when the south is being robbed of Soviet power, you usually see it clustered hard from Tula to Leningrad. So when you say that Moscow is undefended, I'm a little concerned you've over-encircled the Soviets perhaps due to settings that are too much against the skill you have as an Axis player. If your German army is at about 3.3 million and your Soviet army is at least 4.5 or greater, then you're looking at a pretty 'normal' position on Turn 11. If the Soviet is getting above 5 million, then it can give you a bad winter, especially if you fail to take Leningrad's port supply. You MUST take Leningrad for a solid winter defense.
Also, the AI reinforcements are lowest between turns 9 and 11 (give or take 1). So see what happens between 12 and 17... You might be met by strong resistance soon.
Spring 2018-Playing: Demyansk Shield: Frozen Fortress; Advanced Squad Leader,
Rulebooks: ASL (always ASL), Holland'44, Demyansk Shield: Frozen Fortress