After making a move, the player presses the button on his or her side of the clock, which starts the opponent's time. The clock is used in this fashion until the game is over. Players are penalized 10 points per minute for every minute, or fraction thereof, used over the allotted twenty-five. The process of keeping track of the letters played on the board. This can give the astute player an advantage as the game progresses.
Careful trackers can deduce an opponent's rack after there are no letters left to draw.
By knowing the opponent's rack, the player can often make moves to block the opponent's best plays or set up high-scoring plays that the opponent can't block. Players are allowed to play with their own Preprinted Tracking Sheet alongside their score sheet. The bonus for covering two TWSs on one play is nine times the sum of the value of the letters of the Triple-Triple word. The sum should include the extra values earned from any DLS covered that turn. By playing for turnover, a player maximizes his or her chances for drawing the better tiles.