Multiplayer Go

In this game there will be a board with horizontal and vertical lines that make up a board with 19 x 19 intersections. You and your opponent take turns to place stones on the intersections.
The score is calculated by adding up the total area surrounded by your stones, plus the number of opponent stones captured. You can capture the opponent stones by surrounding the opponent stones with your stones and/or the edges of the board completely.
If there is an blank space inside the area of opponent stones, then those stones are not yet captured, and they can be captured only when you put a stone to fill that empty space.