Ludovox http://ludovox.fr/jeu-de-societe/bang-le-duel/
Français - Dégainez le premier... à deux !
Boardgamegeek https://boardgamegeek.com/boardgame/182094/bang-duel
Anglais - BANG! The Duel is a two-player version of BANG! in which each player chooses a certain number of characters from a personal deck, with one deck containing lawful individuals and the other one outlaws.