8.2 Kabe
If there are no genbutsu or honors, let’s look for kabe before suji.
When all four copies of a tile are visible, that tile is called a kabe. Count the discards, your hand, and the dora indicator.
With no 3-sou left, neither a 23-sou ryanmen nor a 34-sou ryanmen is possible.
So 1-sou and 2-sou cannot deal into a ryanmen.
For 2-sou, the 13-sou kanchan is blocked too.
Even if 4 is a kabe, 1 is not safe, because the 23 ryanmen remains.
That is why a kabe is powerful when it is a 2, 3, 7, or 8.
Discard one tile that a kabe keeps from dealing into a ryanmen.
You picked . It is not blocked by a kabe.
7-pin is a kabe, so 8-pin and 9-pin cannot deal into a ryanmen.
You picked . The ryanmen on the other side of the kabe is still open.
Discard one tile that a kabe keeps from dealing into a ryanmen.
You picked . It is not blocked by a kabe.
2-sou is a kabe, so 1-sou cannot deal into a ryanmen.
You picked . The ryanmen on the other side of the kabe is still open.
Discard one tile that a kabe keeps from dealing into a ryanmen.
You picked . It is not blocked by a kabe.
3-man is a kabe, so 2-man cannot deal into a ryanmen.
You picked . The ryanmen on the other side of the kabe is still open.
Discard one tile that a kabe keeps from dealing into a ryanmen.
You picked . It is not blocked by a kabe.
7-sou is a kabe, so 8-sou and 9-sou cannot deal into a ryanmen.
You picked . The ryanmen on the other side of the kabe is still open.
Discard one tile that a kabe keeps from dealing into a ryanmen.
You picked . It is not blocked by a kabe.
8-man is a kabe, so 9-man cannot deal into a ryanmen.
You picked . The ryanmen on the other side of the kabe is still open.