Speaking of revisions
"Suddenly, his mind jumped to something that had occurred to him the first time he had played chess with a computer. He had made a mistake and was about to take it back when he thought that, in life, you can’t really take back what you’ve done wrong. The only thing you can do is to improve your way of playing from there on to make up for your mistake. He had decided then that he would never take back a move when playing chess with a computer. Sometimes with a winning game, he made a bad move and lost. He then went back step by step to find the move that had lost the game. That self-imposed discipline not only improved his game, it made him more thoughtful in life.
SPY’S FATE, Arnaldo Correa, (Akashic: 2005)