Being aware of your surroundings can help you take advantage of the mistakes that players frequently make when deciding which cards to keep or discard. Taking advantage of an opponent's discarding of a downloadable gamescard that could have completed their own set or run but is also advantageous to you, for example, can help you win the game. Also, being aware of typical pitfalls that players face can improve your ability to predict their moves. For instance, some players might get unduly fixated on high-value cards because of their point value without taking into account the possibility that they could form melds.
tjya