2. MAP
It's kind of hard to see where major rivers begin and end unless you have ideal lighting. The Volga is all major river hexes. Likewise, the Dnieper (but not its Samara tributary). The Don becomes a major river at the place where hexes 4016, 3915 and 3916 come together. That's all the major rivers there are. Only hexes with green tree symbols in them are actually woods hexes.

3. RULE 15.5 (Clarification)
The non-corps, one-step, German units DO  indeed yield victory points for their destruction. You just do not record any "totally destroyed" bonus points for them as you do for regular corps. Further, the "totally destroyed" bonus for the multi-step ad hoc units IS  recorded. That is, FP, Ho, L/K, SF, MI and RS do earn that bonus. (Likewise, Group Popov, once the FMCO is declared, would earn the bonus destruction points for the Germans).

4. RULE 15.4 (Clarification)
The Soviet need not destroy German/Axis steps in actual combat to gain VPs fro them. That is, German/Axis units that waste away due to supply likewise yield VPs. This same holds true for the German players once the FMCO is declared.

5. RULE 10.47 (Add)
If a defeated mobile assault force is placed back in its launch hex, and there absorbs its combat result as a step loss(es), it may NOT move further --- except to launch another MA if it has the movement points remaining to do so --- unless the unit(s) that just defeated it are ones that exerts no ZOCs. Otherwise, the "sticky" EZOCs pin it. (That pin effect would hold, too, if other enemy units not previously MAed exerted their ZOCs into the defeated MAers' end hex.) If the MAing force chose the MA-again option, it COULD MA into a different, adjacent, enemy occupied hex.