8 · Kong patterns
Conditions
Two concealed kongs. The adopted WMO value is used, and Two Concealed Pungs is excluded when this is counted.
How to build it
Track the fourth copy and whether each kong is exposed or concealed. Before declaring, check concealed-pung counts and the replacement-tile winning chances.
Key tile shapes
Patterns not counted together
Concealed Kong · Two Concealed Pungs