Try to keep a mental track of which of the most useful letters (J, Q, X, Z, S and blank) have been played. In tournament Scrabble, it is permissible to write down the letters as they are played. It is then possible in a tight endgame to work out what your opponent has on his/her rack and to make your play taking this into account, perhaps blocking an opportunity for them or setting yourself up with a scoring place which you know they cannot block.

If you do track tiles during the game it will help you make decisions about which tiles to play and which to keep. For example, you can play CLEAN or CLEAR for the same score, so you consult your tracking sheet and discover there are 3 R's left to come and only 1N. Therefore, you are more likely to pick up another R than an N and the better move is to play CLEAR, lessening the chances of creating duplicate letters and unbalancing your rack.