If you were to create a checklist of a war game covering the Nazi invasion of the Soviet Union in 1941 you'd need quite a lot. To start with it would have to be massive with a near endless supply of Russian units and a bitter winter that breaks both men and machines. The Germans would possess a limited quantity of units of exceptional fighting prowess supplemented by axis allies of limited capability whilst the Russians would start off poor and steadily improve during the campaign. Twice a year the Raspitutsa causes movement and combat to grind to a halt as liquid mud follows the change of seasons. ...