For those who haven't seen or played the original, it was a game set around the islands of Caribbean Sea around the 1600's. You were a young pirate captain. Your goal was to become wealthy and retire. Along the way, you could find lost relatives, find buried treasure, capture Treasure fleets and if you were rich enough, you could marry a beautiful woman.
There were four main aspects to the game:
Sailing around the map where you would encounter other ships, which you could choose to fight. Fighting resulted in a naval battle between your flagship and the enemy. You had to allow for the wind in your attacking strategy. To win the battle, you could either sink their ship or attempt to board to enemy.
Boarding would result in the second aspect of the game, swordfighting.
Swordfighting could be done at two times, when boarding ships as mentioned and when attacking cities. Swordfighting involved you and the enemys leader squaring-up in a duel. Each hit to your enemy would result in a reduction in his armys morale. When morale got too low, they would surrender and you would win.
The third aspect was land battles. You could enter (and sometimes this was the only option) enemy cities by land rather than by sea. This would result in a land battle between your crew and the enemy troops. Skillful maneuvering of your crew would get them to the enemys fort and a swordfight would then ensue.
The last aspect of the game was trading. You could successfully play a game without lifting a finger in anger if you were so inclined. You could buy and sell certain provisions (food, sugar, cannons, I think) as well as repair ships in friendly towns. Prices of goods were higher in some towns than in others, so knowing where to sell items was important.