We, being a group that upholds honor in all it's forms, should try to abide by these rules in chess.
1. We shall resign in good grace after being evidently defeated. By not doing so we show contempt for our opponent by trusting him to make a mistake. The only reason for continuing a game would be for beginners to watch an end game in progress and learn from it.
2. We shall not torture an opponent after the game is won, or lost. Such examples are pushing too many pawns to the back rank for promotion, holding a person's king captive while you kill every last piece, and using the maximum time per move to drag the game out.
This is all I have for now, but I'll add more if you can think of any!!! Also, feel free to comment on what is already up.