The point value for a hand can be doubled a number of times for a
variety of rare achievements. Most of these rules of these are
additional properties of Sets that are summarized
by the Hand.
Each non-pair Set that contains lucky tiles
is worth 1 double (2×). In the case of the player's wind being the
prevailing wind, a Set of this wind is worth 2
doubles (4×)
A hand of four ThreeSet or
FourSet (i.e., no
SequenceSet) merits a double. Depending on how
the hand was played and how many of these triples were concealed or
melded, the hand can have a second double, or possibly even pay the
house limit, something we'll look into in the section called “Limit Hands”. For now, we are ignoring these
mechanics of play issues, and will simply double the score if there are
no SequenceSets.
A hand that has three consecutive
SequenceSets in the same suit is doubled. There
are many rule variations on this theme, including same-rank sequences
from all three suits, same-rank ThreeSets or
FourSets from all three suits. We'll focus on the
three-consecutive rule for now.
If the hand is worth exactly 20 points (it is all
SequenceSets and an unlucky
PairSet), then it merits one double.
There are six different consistency tests. These are exclusive and
at most one of these conditions will be true.
-
If the hand is all terminals and honors (no simples), it is
doubled.
-
If each set in the hand has one terminal or an honor in it,
the hand is doubled. A hand could have four
SequenceSets, each of which begins with one
or ends with nine, and a pair of honors or terminals to qualify for
this double.
-
If the hand is all simples (no terminals or honors), it is
doubled.
-
If all of the SuitTiles are of the same
suit, and all other tiles are HonorsTiles,
this is doubled.
-
If all of the SuitTiles are of the same
suit, and there are no HonorsTiles, this is
doubled four times (16×).
-
If the hand contains Sets of all three
dragons, and one of those sets is a PairSet,
this is called the Little Three Dragons, and
the hand's points are doubled.
There are a few more ways to add doubles, all related to the
mechanics of play, not to the hand itself.
Update Set Class Hierarchy. You'll need to add the following functions to the
Set classes.
-
A lucky function that returns
True for a ThreeSet or
FourSet with lucky tiles (dragons, the
prevailing wind or the player's wind. It returns
False for other kinds of
Sets or Sets without
lucky tiles.
-
A triplet function that returns
True for a ThreeSet or
FourSet. It returns False
for other kinds of Sets.
-
A sequenceSuit function that returns the
suit of a SequenceSet. It returns
None for other kinds of
Sets.
-
A sequenceRank function that returns the
lowest rank of a SequenceSet. It returns
None for other kinds of
Sets.
-
An allSimple function that returns
True if the Set contains
only simple tiles.
-
An noSimple function that returns
True if the Set contains
no simple tiles. This is an all terminals and honors
Set.
-
An oneTermHonor function that returns
True if the Set contains
one terminal or honor. Since we only have a
simple function, this is one non-simple
Tile in the
Set.
-
An suit function that returns the suit
for a Set of all
SuitTiles (either
SimpleSuitTiles or
TerminalSuitTiles). It returns
None if the Set contains
HonorsTiles.
-
An bigDragon function that returns
True for a TreeSet or
FourSet of dragons.
-
An littleDragon function that returns
True for a PairSet of
dragons.
Update Hand Class. You'll need to add the following functions to the
Set classes.
-
luckySets(
prevailWind
,
myWind
) returns the number of
lucky sets. This function also checks for the double wind conditions
where
prevailWind
is the same as
myWind
and one of the
Sets has this condition and throws an
additional doubling in for this.
-
groups returns 1 if
all Sets have the triple
property True.
-
sequences returns 1
if three of the Sets have the same value for
sequenceSuit, and the values for
sequenceRank are 1, 4, and 7.
-
noPoints returns 1
all of the Sets are worth zero points.
-
consistency returns 1
or 4 after checking for the following conditions.
If allSimple is true for all
Sets, return 1. If
noSimple is true for all
Sets, return 1. If
oneTermHonor is true for all
Sets, return 1. If every
Set has the same value for
suit and there are no
Set where suit is None,
return 4. If every Set has
the same value for suit or the value for
suit is None, return 1. If
there are two Sets for which
bigDragon is true, and one
Sets for which
littleDragon is true, return
1.
The sum of the double functions is the total number of doubles for
the hand. This is d =
luckySets(
prevailWind
,
myWind
) + groups
+ sequences + noPoints
+ consistency . This sum is the power
of 2 to use: the score is multiplied by
2
d
. An amazing hand of
all one suit with three consecutive sequences leads to 5 doubles, 32×
the base number of points.
You'll want to add a doubleReport which
prints a small scorecard for the hand, showing each double that was
awarded. You can then write a scoreCard which
products the pointReport, the
doubleReport and the final score of
points
×
2
doubles
.
The total score is often rounded to the nearest 10, as well as
limited to 500 or less to produce a final score. This final score is
used to settle up the payments at the end of the game.
