I am in the process of re-reading a book of short biographies of Old West American gunfighters and lawmen, and came across an unusual duel between one gunslinger-turned-lawman and a nemesis who had challenged him. I thought I would pass it along to you as a novelty.
It took place in El Paso, I think, in the late 1880s. Anyway, according to the challenged, the rules of the duel were that it would take place in an empty room at midnight with all the windows covered so that it would be pitch black in the room. The two duelists stood in opposite corners of the empty room. Each had a knife in each hand. Then the seconds hurriedly turned out the light in the room and locked the door.
Photo at top of post: John Wesley Hardin. Not the man involved in this duel, but the gunfighter with the highest known tally; he killed 42 men. A bad man and probably a psychopath. These men were an odd lot, but so were the times and places they lived in.