Calling Riich first in the early round is very strong regardless of the wait

For Advance 2 Mahjong soul

What would  you do ??

①  Call for Riich  by discarding 5s

②  Not for ready by discarding 8p

Answer

①　Should call for Riich

Commentary

Calling Riich first in the early round is very strong regardless of the wait.

First , the win rate and the Deal-in rate  when the player goes for riichi in this situation are shown in red letters of the figure.

The reason for discarding 8p here is to make a double-sided hand.

In order to make a double-sided hand, you need to draw five types of hands: 5p, 3 4 6 7s.

The probability of drawing one specific type of mahjong tile is about 3%.

So, the probability of this hand turning into a double-sided hand is 3 x 5=15% per one round.

So, on average, it will take 6 to 7 rounds for this hand to turn into a double-sided hand.

In other words, you can expect to reach double-sided riichi in the 10th or 11th round on average.

Therefore, we have to compare the probability of double-sided = blue letters.

However, this is the case when you proceed alone.

Taking into account other players

During this time, on average, 1.2 players have already made ready hand, so you have to take into account the possibility of calling riichi following other players.

The following table shows the Win rate and Deal in rate at that time.

In other words, it is most reasonable to compare the red letters in the table above with the blue letters in the table below.

Summary

If no one makes ready hand, there is not much difference, and if someone makes ready hand, you are at a disadvantage, so riichi is the way to go.

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