Ok, got it. In Stalingrad I needed brilliant victory to get (after Astrakhan) Kuibyshev scenario.
Thanks for the insight. Problem solved.

<r>
<QUOTE><s>[quote]</s>ORIGINAL: stormbringer3<br/>
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IIRC you must have a brilliant victory at Stalingrad to unlock all the campaign scenarios.
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I think it has something to do with my prestige level (dropped below same minimum level?) but I didn't find it ...

<r> Manual is rather brief about the campaign solo games, so I have a little question. I played 8 scenarios in the German campaign, with various level of success. Now I have a 89 % level of success playing 8 out of 9 scenarios. If I read the manual correctly, I should have a victory level good ...