In the criminal underworld when a man becomes so powerful he is able to show up at another man's home and kill him without repercussions, there are two people involved in this scenario. The one who opens the door and gets shot, and the one who knocks.
This refers to the Original Dungeons & Dragons published in 1974. It is truly The One True Game, the game that rules all other games and provides more fun and enjoyment than any other game ever devised.
It requires imagination and creativity, that limits the game to those who are of above average intelligence. It also requires flexible thinking and the ability to make decisions. This disqualifies the rules lawyers, the by the book crowd and the decision challenged.
The One True Game makes a clear distinction between the Old School Gaming and New School Gaming.
The One True Game refers specifically to the 1974 original version of Dungeons & Dragons that was published as 3 little booklets in first a small woodgrain color box and later in a small white box. This usage is by ardent supporters of the Original Dungeons & Dragons game and is an indication of their passion for and devotion to the original D&D game and is not to be taken as anything else.
A person who you we're originally supposed to end up with, but due to a cause of fate or by consequences cause by you the relationship failed and as time goes by you wonder what you and that person could have been, making them the one that got away.