Scoring
The names of the different score slots are mostly self explanatory:
ones, twos, threes, fours, fives, sixes
You will receive the numerical value of the slot multiplied by the number of dice of that number you have, for example:
If you have three fours, and you choose the fours slot, you will receive 3x4 points = 12 points
If you have five sixes, and you choose the sixes slot, you will receive 5x6 points = 30 points.
Three of a kind, Four of a kind
If this slot is chosen and you have three or four of one value of a dice, the score you will receive will be equal to the total of all of your dice. For example:
If you roll 6,5,6,6,1 you have three sixes, and so you can use the 'three of a kind' slot. The score you get is equal to the total of all your dice, which is 24.
If you roll 1,1,1,1,5 you have 4 ones, and so you can use the four of a kind slot. The score you will receive will be 9.
Small Straight, Long Straight
A straight is a run of numbers, e.g. 1,2,3,4,5. A short straight contains four numbers, and a long straight contains 5. The numbers do not have to be in order. A long straight gets 40 points, a small straight gets 30. For example:
5,6,2,4,3 is a long straight, and so you would get 40 points
1,4,4,3,2 is a short straight, and so you would get 30 points
Chance
This simply adds up the total of all the dice rolled and adds it to your score, regardless of the numbers rolled. For example:
Rolling 5,6,3,4,5 would give you 23 points.
Yahtzee
This is when you get five of the same number, and you are rewarded with 50 points. For example:
Rolling 1,1,1,1,1 would give you 50 points.
Bonuses
If the total of the points scored from the ones, twos, threes, fours, fives, and sixes is 63 or more, a bonus 35 points is given.
If more than one 'Yahtzee' is achieved, a bonus 100 points is rewarded per extra yahtzee.