The blond hair knight cannot be the Knight of Life, or he
would identify himself when asked. The red hair knight also lied
because he claimed that the blond hair knight is the Knight of Life.
This leaves the black hair knight as the Knight of Life. This knight
identified the blond hair knight as the Knight of Death. The red
knight is therefore the Knight of the Dungeons. The lucky man chose
the black hair knight and was set free immediately.