The Rules of Maxi Yatzy 
The object of Yatzy is to reach the highest possible point score by rolling and scoring dice.
A game of Yatzy consists of 20 turns, with up to three rolls of the dice allowed for each turn.
At the end of each turn a score must be chosen. If some rolls are not used, it will be saved to another turn.

Ones: Scores 1 x the number of ones thrown. E.g 1-1-1 scores 3 points 
Twos: Scores 2 x the number of twos thrown. E.g 2-2-2-2 scores 8 points 
Threes: Scores 3 x the number of threes thrown. E.g 3-3-3-3 scores 12 points 
Fours: Scores 4 x the number of fours thrown. E.g 4-4-4-4 scores 16 points 
Fives: Scores 5 x the number of fives thrown. E.g 5-5-5 scores 15 points 
Sixes: Scores 6 x the number of sixes thrown. E.g 6-6-6-6 scores 24 points 

Bonus: 100 points if the subtotal is 84 or more.

1 Pair: E.g. X-6-6-X-X-X scores 12 points. 
2 pairs: E.g. X-6-6-1-1-X scores 14 points. 
3 pairs: E.g. 4-4-6-6-1-1 scores 22 points 
3 of a kind: E.g. X-5-5-5-X-X scores 15 points. 
4 of a kind: E.g. X-2-2-2-2-X scores 8 points. 
5 of a kind: E.g X-5-5-5-5-5 scores 25 points 
Small Straight: E.g. 1-2-3-4-5-X scores 15 points. 
Large Straight: E.g 2-3-4-5-6-X scores 20 points. 
Full Straight: 1-2-3-4-5-6 scores 21 points. 
2+3: E.g 5-5-5-6-6-X scores 27 points 
3+3: E.g 5-5-5-6-6-6 scores 33 points 
4+2: E.g 6-6-6-6-4-4 scores 32 points 
Chance: Scores the total of all dice 
Yatzy: 6 of a kind: Scores 100 points if all dice have the same value