Ah, right. You can’t play the same moves in response to all of your opponent’s moves. (This is true for both white and black). I assumed the person you were res

Ah, right. You can’t play the same moves in response to all of your opponent’s moves. (This is true for both white and black). I assumed the person you were responding to meant that they play the Najdorf Sicilian whenever white allows them to enter that line. For example, you can’t play any kind of Sicilian, whether Najdorf or otherwise, against 1. d4 (white’s second most popular first move, behind 1. e4).