The diagram on the right shows a game being played on a 2×2 board (3×3 dots). The second player ("B") plays a rotated mirror image of the first player's moves, hoping to divide the board into two pieces and tie the game. But the first player ("A") makes a "sacrifice" at move 7 and B accepts the sacrifice, getting one box. However, B "must" now add another line, and so B connects the center dot to the center-right dot, causing the remaining unscored boxes to be joined together in a "chain" (shown at the end of move 8). With A's next move, A gets all three of them and ends the game, winning 3–1.