I'm getting set to play a 1939 campaign game of TK and noticed for the first time that the Soviet Card 20b (Balkan Pact) is colored blue and has Pre-War printed in the upper right-hand corner, even though card 20b is in the middle of the light-gray limited-war cards. Is there some reason for this, or is it a printing error? I looked through the rest of the cards and can't find any other cards out of color sequence.
I dont think it is a printing error.
Before war begins, they can be diplomatic towards the balkans (20b). After war has started, they can instead chose to use brute force (20a).