Never be the first to attack.
Retaliate only after the other party has attack.
Be prepared to forgive after carrying out an act of retaliation.
Tit for Tat is not a spiritual path but may in fact be the best strategy available for those who wish to survive in our imperfect world.
Benefits of Tit for Tat
Niceness. It never pursues the aggressive or negative strategy first.
Clarity. It is uncomplicated, and so the other player can figure out what the tit-for-tat player is doing easily.
Provocability. It can be provoked into retaliating, and so cannot be taken advantage of cheaply.
Forgivingness. If the other player goes back to being cooperative, so will the tit-for-tat player.