going to look at 3 spots.
the first player has a turn by joining two of the spots and marking a new spot in the middle of the line. or the line may start and end on the same spot.
you are not allowed to draw a line which crosses another line. this is important to remember!
a spot cannot have more than three lines leading to or from it. for example, in the game below, spots a and b cannot be used any more because they already have three lines.
the idea is to make it impossible for the other player to draw a line.
so the last person to draw a line is 