A SYSTEM TO AVOID ERRORS IN CORRESPONDENCE CHESS This system was adapted from Purdy's over the board system. I hope you find it useful.
1. Write the received/sent date on your opponent's card.
2. Maintain a notebook (bound or loose-leaf) for your analysis of the games.
3. Play through the game from the start, every time. Don't use recorders or computer programs to keep track of your games.
4. How has my opponent's move changed the position?
5. Conduct a review of the position, looking for the following items: a) how many more moves must I make to be fully developed? b) Is my King safe? c) Do I have a good pawn position? d) What are my opponent's threats? e) Examine every check, no matter how absurd looking f) Are any combinations possible? g) Write down your analysis in your notebook.
6. Determine if you need to do more research on the position. If so, repeat item 5.
7. Make a preliminary decision on your move - then wait a day.
8. Look at your move again, paying particular attention how it changes the position.
9. Mail your move.
10. While waiting for your opponent's move, examine the possibilities that exist in the position, from his point of view. Make notes if necessary.
Though this system may seem cumbersome at first, you will soon realize that not all steps are necessary every move. If you use this system, I believe you will cut down your mistakes drastically.