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Black has four popular moves here: Nb8-c6, e7-e6, a7-a6 and g7-g6.
The first three might all lead to the same sort of position (which we'll look at in a minute), but White has slightly different options in each case.
A quick note about a7-a6. This is called the NAJDORF variation and is the favorite of Garry KASPAROV and, formerly, of Bobby FISCHER. You're probably thinking this looks a pretty strange move, breaking most of the rules of opening play.
In fact the move has three points.
To stop White using b5 for his Minor Pieces, to prepare the move b7-b5, gaining space on the Queen side, and to wait to see where White develops his Bishops before choosing between e7-e6 and e7-e5.
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