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Each player get assigned black or white color.
The board starts with two white disks and two black disks.
Black player always start.

Beginning:

Players take turn in placing their colored disk on the board.
A valid move is when a player can “capture” another disk. A “capture” is when a move is made with, for example, the black disk and a straight line (horizontal, vertical, or diagonal) is created between the new disk and another black disk with white disks in between. The white disks are then captured, i.e. switched to black disks.

Black makes a move:

Black captured white disc:

The goal of the game is to have most disk of the assigned color when the game ends.
A game ends when there are no more possible moves.
If a player cannot make a move, the turn goes back to the previous player.

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