Sandbox written by Charmaine Ong.

Weird baiman end. Chinitsuu, rinshan and dora 4. Should have chi instead of pon to secure the win though. [1]

Happoubijin in Chinitsu

There only exist 16 possibilities for an 8-sided wait in chinitsu, 14 of which include either Happoubijin starting with 2 or 3. For the other 2, it's a variant usage of Happoubijin starting with 1 or 4 (see middle).

              Waiting for:          Not including:   2-Happoubijin with 111
              Waiting for:          Not including:   2-Happoubijin with 345
              Waiting for:          Not including:   2-Happoubijin with 456
              Waiting for:          Not including:   2-Happoubijin with 888
              Waiting for:          Not including:   2-Happoubijin with 999
              Waiting for:          Not including:   2-Happoubijin with 678
              Waiting for:          Not including:   2-Happoubijin with 789
              Waiting for:          Not including:   1-'Happoubijin' with 678
              Waiting for:          Not including:   4-'Happoubijin' with 234
              Waiting for:          Not including:   3-Happoubijin with 123
              Waiting for:          Not including:   3-Happoubijin with 234
              Waiting for:          Not including:   3-Happoubijin with 111
              Waiting for:          Not including:   3-Happoubijin with 222
              Waiting for:          Not including:   3-Happoubijin with 456
              Waiting for:          Not including:   3-Happoubijin with 567
              Waiting for:          Not including:   3-Happoubijin with 999