Pinfu 02 - CAUTION when self-drawn

Pinfu means 'peace' in Japanese and 'mild' in Chinese.
But I think pinfu may be troublesome for newcomers in certain way.
One of the feature which includes problem is scoring system.

The minimum score of self-drawn hand in Japan is,
if you are a non-dealer,
300 for non-dealer and 500 for dealer .
It is called 'gomi' or 'garbage,' partly because it is a homophone of '5-3,'
partly because it is rather useless score as garbage.
Total earnings... 300*2 + 500 = 1100

Question: if you win pinfu with your self-drawn tile, how much can you earn?

1100 * 2 = 2200?  Nope.

The answer is 400 * 2 + 700 = 1500.

WHY?

OK, I understand you would like to read the following boring explanation.

The basic score of pinfu is 20.
Pinfu is 1 yaku, meaning 1 double
so the score will be 20 * 2 = 40

Since you draw your winning tile, you secure another yaku,
Tsumo ツモ　or "Menzenchin Tsumohou　門前清自摸和," 1 double
the score will be 40 * 2 = 80

Unlike in the end of WWII, Japanese mahjong scoring system quadruplicates the score since in the midst of the 20th century.
so that the score will be 80 * 4 = 320

Finally the score should be rounded to the nearest 100 above
therefore the score IS 400

Of course you do not have to memorize such procedure
Just keep in your mind that you will earn 400, 700

 N O T  1000 2000 OR MORE

Understand?

...I confess I didn't when I was a newbie.



Do you really understand?

Question 2
You have won pinfu, self-drawn with 2 dora.
How many point will you earn?
Hint: 4 doubles.

2000, 4000?
NOOOOOOOOOOOOOOO!

The answer is
1300, 2600

Therefore I say pinfu may be troublesome.