Nine is a game played between two players.
At the start of the game, each player is given nine mahjong tiles numbered from 1 to 9.

In each round, you choose one tile from your hand to play. This tile is hidden from your opponent.
Once both players have chosen their tiles, they are revealed simultaneously.

The player who reveals the tile with the higher number wins the round.
The winner gains points equal to the sum of the numbers on both tiles.
For instance, if you play a 9 and your opponent plays a 1, you win the round and gain 9+1=10 points.

If both players play tiles with the same number, the round is a draw and no points are awarded to either player.

Once a tile has been played, it cannot be used again.
This process continues for nine rounds, after which no tiles will remain.

At the end of the nine rounds, the player with the most points is declared the winner of the game.