Well attacking Poland I mostly do it like this:
Brown is encirclement
Red is main attack
Blue is second main attack,
Violet is the third wawe
My comment: This is not bad at all, I just have two suggestions, have some cavalry rush through Danzig and link East Prussia with metropolitan Germany (especially for supply purposes), and also, I would (and do) hit Cracow early from as many angles as possible since it is one of the VP provinces and the earlier you finish Poland, the better off you will be. In my experience, just moving into Cracow seems to take forever for some reason, so I get it out of the way as soon as possible (I use what MTN troops I have as they attack across the river better and Cracow is a difficult nut to crack along with being hard to enter). It's still usually my last VP gained before the MP hits, and I can annex. To trigger the MP (east Poland to the USSR), you need Danzig, Lodz, Cracow, and Warsaw.
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Then the SU. The light blue show where my spearheads push and the brown shows encirclements and the dark blue shows the final push to destroy these pockets.
My comment: This is pretty good, and I usually use a close variant to it. I only have one minor suggestion, then I'll mention my variant of it. Your top panzer attack and encirclement are correct, attacking provinces where there are no river lines to cross, but the other one crosses a river line from its initial province of Zamosc. Attack the province just below it and you get a clear path into the rear once you crack the lines.
Now my variant is simply this, I'll send a large INF force up the Baltic coast that will hold the northern encirclement out of supply once you get it down to 3 provinces or break it into 3 province groups. Otherwise the Soviets will still supply their troops over Estonia's coastline.
You can do the same for the Black Sea coastline if you take Romania like the picture shows (though I never have so far). But the southernmost pocket usually nets a lot less troops than the northern pocket and so is less important. That central pocket in east Poland and the Pripet Marshes is the most important followed by the northern pocket.
I usually have a very loose southern "pocket" that just nets a few divisions near Romania, and use the penetration there instead to quickly surround and eliminate the potential strongpoint of Kiev and then establishing myself near Rostov, and taking the Crimea on the run. I don't want Sevastopol to be a problem either. It also gets me over the major river lines before real resistance builds up. Once I get to Stalingrad, I've broken through so completely, that is just clear sailing all the way south of the Urals to any point east. This is the quickest invasion route to those areas. I'll send a few divisions to occupy Baku (MTN divisions) as well. They continue into Persia once reinforcements from the north and center armies arrive.
The north and central armies still have a nice level of difficulty as they have to break the resistance around Moscow (central), and Leningrad (north), and attack Murmansk in the north (sometimes by amphibious invasion), and Archangelsk, and then support the south army on its drive east and south into the Caucasus mountains. Once I'm doing that, my divisions form north and center armies can usually only keep up by using SR. The Red Army is also quite ravaged and the USSR is quite prostrate by then, offering little but token resistance.
