User blog:KyuuAL/San Ankou and Toi Toi

This is to demonstrate a close occurrence where San Ankou and Toi Toi may occur together, and when they do not.

San Ankou + Toi Toi

Tsumo:  Open:

The Tsumo on the 2-wan allows the 2-wan to count as the 3rd Ankou (closed triplet).

Toi Toi

Ron:  Open:

The Ron on the 2-wan shows the 2-wan to count as a "pon" (open triplet). Thus, San Ankou does not count here.