Coincidently, I read an article about it a little while back. Hope it helps:
http://www.chess.com/article/view/minority-attack
What's a minority attack?
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Aug 12, 2014
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#3
A Pawn majority (eg: 3 vs 2) on one flank is considered an endgame advantage. But if the player with the minority of Pawns can succeed in advancing them during the middle-game, with lots of pieces still on the board, they can trade their 2 vs 3 down to 0 vs 1... in other words, they can give the opponent an isolated Pawn, while there are still plenty of pieces left to exploit it. The opponent will usually not let it go quite that far, but will often end up with a backward Pawn on an open file instead.
Simply put means fewer attacking greater odds. Happens in middle game often when a player hopes to neutralize a pawn majority on one side to eliminate a possible favorable endgame later on for the opponent.
A minority attack occurs frequently in the Queens Gambit Exchange Variation.
In the above pawn-structure White has two plans.
First plan: White will play the Minority-Attack and tries to win the resulting weak c-pawn. So he will play at the queenside.
Second plan: White expands in the center playing f3 followed by e4. In this case he will play just in the center and the kingside.
How to play the Minority-Attack?
At the queenside White has just two pawns against three pawns. The goal is to create a black pawn weakness at the queenside. This weakness will then be attacked in the course of the game. To achieve this White moves his b-pawn to b5 and exchanges it for the c-pawn. Then a weak c-pawn will be the result. This is called a Minority-Attack. That means a minority of TWO pawns is attacking a majority of THREE pawns.
Of all the things I know about chess (not a lot), this is one of them.