Chess-ing the oponent's move

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In boxing, it said that you can run but you can't hide. But in chess I think you cannot play if you cannot think. Playing chess is time and mind consuming game. Your mind will be weakened and you cannot think properly. According to my friend, one way to play chess well is by chasing (chess-ing) your opponents move. He told me that you must watch your opponent's move and prepare the attacks that lies behind it. You must observe well the move of your opponent and establish a counter attack if possible.