If you joined the nimzo indian tournaments, you may have met many of the common plans in the nimzo indian. The Nimzo-Indian Defense (E20) is known as a solid defence for black to meet the queen pawn opening. If you didn't, this tournament may be the place to start.
Qc2 is to avoid the doubled pawns on the c-file that charactherizes the saemisch lines. The traditional line is as follows:
1. d4 Nf6 2. c4 e6 3.Nc3 Bb4 4. Qc2
It is still balanced, but with different kinds of weakness and advantages for black and white.
There are many, many plans connected to this opening. I can recomend the "Game explorer" (or similar) to investigate the options.
Have fun figuring it out :)
This tournament is for all those that like to explore different openings in a competetive environment.
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Here are some facts about this opening:
a) Strong grandmasters who used this line as White:
White scores averagely (53%).
White performs Elo 2347 against an opposition of Elo 2326 (+21).
Black performs Elo 2296 against an opposition of Elo 2317 (-21).
White wins: 9225 (=34%), Draws: 9753 (=36%), Black wins: 7789 (=29%)
The drawing quote is Average. (7% quick draws, < 20 Moves)