Lucky in Love

 is a mission in Red Dead Redemption, where the player learns to play poker and dueling.

Story
Marston approaches Landon Ricketts in the town of Chuparosa, as Ricketts is playing poker with some locals, as well as Andreas Müller.

Walkthrough
The player sits down and plays poker with Ricketts and his friends. After two hands, Muller will accuse Marston of cheating, and after a stand-off over the table, Ricketts convinces Muller to accept a duel. After winning the duel, Marston and Ricketts have a drink. As they do so, The Stranger, a friend of Muller and a participant in the poker game, will approach, holding a knife to a girl's throat, threatening that he'll kill her. Marston is forced to kill the man, in order to save the girl's life.

After killing The Stranger, four accomplices appear, which Marston and Rickett will take out. After the shootout, Marston and Rickett will part ways.
 * This level is an extremely good way to earn a Gold Medal, and the corresponding achievement.

All one has to do is-

1. Go all-in on both bets to speed up the game

2. Shoot Muller in the head

3. Shoot the Stranger in the head

4. Shoot the Stranger's accomplices in the head. Some Dead-Eye will suffice for this.

Video
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Trivia

 * When Marston says to the German "As you wish, Germany. As you wish." this is most likely a reference to the movie The Princess Bride. (http://www.imdb.com/title/tt0093779/quotes)
 * More obviously, when the German says "There must be a name for this", he's referring to the not yet coined phrase "a Mexican Standoff"
 * During the poker game, going all-in on both bets will most likely earn the player the achievement 'High Roller'. If not, simply restart the mission and try again. It's much easier this way than playing in the Blackwater High Stakes room.