"Atamakin" means Gold drop on the square ahead of the opponent's King supported by other piece of yours on the board. This gold drop is frequently used when checkmating the King in the endgame. It is necessary to be able to make an Atamakin for you to win a game. You can learn by solving Atamakin Tsume Practice problems to be posted here. Today is #20. It's a 7 move tsume. I recommend you to replay the answer to remember the line if you cannot solve this problem within 5 minutes.
You can see the answer by clicking the arrow in the right direction under the board in order to replay the answer line. (Popup diagram to be saved for printing) Click the exclamation marks which appear below the diagram for further comments on the problem. If you click the marks again, the comment windows go away.