Conceal your 5200 hand

 

Answer

②　Concealed

Commentary

 Last article said that the hand only flat hand is always Riichi.

How about all simples without flat hand ??

In this case, Riichi is bad choice.

On the far left column is the average score of winning.

The others are the statistical balance for each round.

There is almost no differences between calling riichi and concealed hand.

One of the reasons is the peculiarity of the score of 5200.

If you call for  Riichi from 5200, the score would not be doubled.

 you would only be paid 1000 points for Riichi fee and 2800 points would be added.

When it comes to round 12, the difference is only 100 points.

Still, even at 500 points, Riichi is still statistically ahead, so I think it's worth considering until round 8. Basically, concealed is the way to go.