Yakuman
Closed only
Difficulty: ★★★★★
Requirement:
- Four concealed triplets or quads
- Ron only permitted when winning tile completes the pair
Origin & Trivia:
The word “anko” comes from older terminology meaning “engraved/formed piece,” suggesting a firm,
unchanging structure. Four such concealed sets evoke the idea of hidden strength. Historically, Suankou
was considered the “true master’s hand,” representing quiet but overwhelming force.