# The Rules of Yahtzee

## Standard Play

### Objective of the Game

**Yahtzee** can be played in solitary or by a group.
The group version simply consists of a number of players playing the
solitary version simultaneously, with the highest score winning. I'll
explain the solitary version, since that's what the applet lets you
play (although you could use the "Clone Window" option to let multiple
players play).
The game consists of 13 rounds. In each round, you *roll* the
dice and then *score* the roll in one of 13 categories. You
must score once in each category -- which means that towards the end
of the game you may have to settle for scoring zero in some
categories. The score is determined by a different rule for each
category; see the section on Scoring below.

The object of the game is to maximize your total score (of course
`:-)`. The game ends once all 13 categories have been scored.

### Rolling the Dice

You have five dice which you can roll, represented by
the die faces at the top of the applet window. To start with, you
roll all dice by clicking on the *Roll All* button. After
you roll all dice, you can either
score the current roll, or re-roll any or all
of the five dice.
To re-roll some of the dice, click on the toggle button underneath the
die face you want to re-roll, then click on the *Re-roll*
button. This will re-roll the selected dice, leaving the
unselected ones unchanged.

You can roll the dice a total of three times -- the initial roll (in
which you must roll all the dice), plus two re-rolls of any or all
dice. After rolling three times, you must
score the roll.

Once you've scored the roll, you roll all the dice again and
repeat the process. You continue until all 13 categories have been
filled, at which time the game is over.

Once you have the dice face combination you want to score, you score
the roll in one of the 13 categories. You do this by clicking on one
of the radio buttons in either the *Upper Scores* or *Lower
Scores* box. Once a category has been scored, it is closed out
for the rest of the game; you cannot change a category's score once
it's been set. Each category defines its own scoring rules, as
described below.
### Upper Scores

In the upper scores, you total only the
specified die face. So if you roll:

and score in the *Threes* category, your total for that entry
would be 9. This same roll would yield zero points if you scored it in the
*Aces* (Ones), *Twos*, or *Fives* category, four points
if you scored it in the *Fours* category, or six points if you
scored it in the *Sixes* category.
When the game is over, if you score 63 or more upper points (an
average of 3 die faces per category), you will get an *upper
bonus* of 35 points. Of course do don't need to score exactly
three die faces in each upper category to get the bonus, as long as
the upper total is at least 63.

In the lower scores, you score either a set amount (defined by the
category), or zero if you don't satisfy the category requirements.
#### 3 and 4 of a Kind

For *3 of a Kind*, you must have at least three of the same die
faces. If so, you total all the die faces and score that total.
Similarly for *4 of a Kind*, except that you must have 4 of the
5 die faces the same. So for example, if you rolled:

you would receive 20 points for 3 of a Kind, but zero points for 4 of
a Kind.

Like in poker, a *straight* is a sequence of consecutive
die faces; a small straight is 4 consecutive faces, and a large
straight is 5 consecutive faces. Small straights score 30 points and
large straights score 40 points. Thus, if you rolled:

you could score either a small straight or a large straight, since
this roll satisfies both.

Again as in poker, a *Full House* is a roll where you have
both a 3 of a kind, and a pair. Full houses score 25 points.

A *Yahtzee* is a 5 of a Kind (i.e. all the die faces are the
same), and it scores 50 points. If you roll more than one
*Yahtzee* in a single game, you will earn a 100 point bonus for
each additional *Yahtzee* roll, provided that you have already
scored a 50 in the *Yahtzee* category. If you have not scored
in the *Yahtzee* category, you will not receive a bonus. If
you have scored a zero in the *Yahtzee* category, you cannot
receive any bonuses during the current game.
You can also use subsequent *Yahtzee*'s as
**jokers** in the lower scores section, provided the
following criteria have been satisfied:

- You have scored a zero or 50 in the
*Yahtzee* category.
- You have filled the corresponding category in the upper scores
section. For example, if you have rolled:

the *Fives* category must also be filled.

If this is the case, you can use the *Yahtzee* as a joker to
fill in any lower scores category. You score the category as normal.
Thus for the *Small Straight*, *Large Straight*, and
*Full House* categories, you would score 30, 40, and 25 points
respectively. For the *3 of a Kind*, *4 of a Kind*, and
*Chance* categories, you would score the total of the die face.
#### Chance

*Chance* is the catch-all roll. You can roll anything and
you simply total all the die faces values.