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In China this game is known as Pong hau k'i and in Korea it is called Ou-moul-ko-no.
Place the two pebbles at the top and two at the bottom as shown below .
Take turns to slide one pebble along a line to an empty spot.
The first move will be to the middle.
To win: block your opponent so that they cannot move.
Next time you play swap start positions on the board with your opponent.