# Fives and threes

## Game rules

This game is played with the base rules of dominos, where the goal is to get rid of all your pieces by forming a chain on the table.

As with all domino games, at your turn, you must place a piece with a value corresponding to those at the ends of the chain.

In general, this variant is played without boneyard. The player with the highest double goes first.

The biggest difference with classic dominos is the way points are counted. By the way, the winner is the first player to reach a predefined limit, by default 61 points.

### Dealing

There are two dealing variants. Whether one try to deal all pieces if possible, or one deal less pieces to make the game shorter and easier.

First variant with more pieces:

Players | Double 6 | Double 9 | Double 12 |
---|---|---|---|

2 | 14 | 16 | 16 |

3 | 9 | 16 | 16 |

4 | 7 | 13 | 16 |

5 | 5 | 11 | 16 |

6 | - | 8 | 15 |

7 | - | 7 | 13 |

8 | - | 6 | 11 |

9 | - | 6 | 10 |

10 | - | 5 | 9 |

11 | - | 5 | 8 |

12 | - | - | 7 |

Second variant with less pieces:

Players | Double 6 | Double 9 | Double 12 |
---|---|---|---|

2 | 5 | 10 | 10 |

3 | 5 | 10 | 10 |

4 | 7 | 10 | 10 |

5 | 5 | 10 | 10 |

6 | - | 8 | 10 |

7 | - | 7 | 10 |

8 | - | 6 | 10 |

9 | - | 6 | 10 |

10 | - | 5 | 9 |

11 | - | 5 | 8 |

12 | - | - | 7 |

### Scoring

Here is the whole point of this domino variant. When a player places a domino, and when the sum of the two ends is a multiple of 3 or 5, the player gets that number of points divided by 3 or 5. If the sum isn't a multiple of neither 3 or 5, no point is won.

For example, if the two ends show 3 and 1, the sum is 4. By playing a domino 1/6, the sum becomes 9 (3+6).

The player who played gets 3 points, because 9 is a multiple of 3, and 9 divided by 3 gives 3. If the next player plays a domino 4/3, the sum becomes 10 (4+6), which gives 2 points, because 2 times 5 is 10.

A double effectively counts double when counting the sum of the two current ends, for example the domino 4/4 counts 8. The double 0 counts 0.

The most interesting sum to reach is 15, because 15 is both a multiple of 3 and 5. As a multiple of 3, it is worth 5 points, and as a multiple of 5, it is worth 3 points, which gives 8 points in total.

IN advanced mode, prime numbers above 3 and 5, such as 7, 11 and 13, give points following the same schema. Thus a sum of 21 whould give 10 points. This mode is especially interesting to play with more complete domino sets, such as double 9 and double 12.

The player who finishes the round get an additional bonus point.

### End of the game

The game ends as soon as the defined score is reached (61 by default). The game is immediately stopped, including in the middle of a round.

One can never go above the limit score. If, by playing a domino, the gained points would make the total score to exceed the objective, then those points aren't won at all.

For example in the following situation: Alice 60, Bob 59, winning at 61, 1/3 at chain ends on the table, if Alice plays a domino 6/1, then she can't get 3 points, she stays at 60 and the game keeps going.

An option allows to disable that behavior of ending immediately the game as soon as the limit is reached. In this case, the above rule doesn't apply and played dominos are always counted even if the victory is already reached.

## Keyboard shortcuts

Keyboard shortcuts are the same as those of classic dominos.