The game is played in three stages. In the first stage you have to take the map pieces from the other players.
When you have all the pieces, you know where the treasure is located (since you would know which part Captain Kidd has swallowed = missing) and you can rush away to the hidden place to get the chest.
In the third and last stage, you have to run away, either with the raft or with one of the rowing boats the player arrived with. All the time the other player can get the map pieces or the chest from you, so you need to be quick and careful.
Of course the pirates may duel with pistols and shoot cannons at each other!
A classic childrens game from Sweden, which has been sold over 30 years, although it's out-of-print now.