Dice Poker: The Sharper
This quest will activate once you beat four professional level dice poker players. In order to complete the Dice Poker: The Sharper quest you’ll need to defeat 3 Sharpers. Zoltan or Dandelion can tell you about these advanced level players. The stakes will be higher so make sure you come prepared with plenty of Orens.
The only Sharper you’ll find in Chapter 3 is Koster who you can find in the Gambling Den in the Trade Quarter at night. The other 3 potential Sharpers can only be played in Chapter 4 so this quest will have to wait until then. See the main quest A Game of Dice for a list of all dice poker players.