What if beginning in August 1942, the Germans didn't try to take Stalingrad but were content to contain it and used most of 6th Army to guard the Don flank, while Army Group A received supply priority for its push into the Caucasus toward Baku. Meanwhile the Luftwaffe did not pound stalingrad but attacked soviet tankers in the Caspian.
How might the outcome of the Russian campaign and WWII have been changed?