Beginner Featured Mahjong Hand Structure: The 4 Sets + 1 Pair Rule (Mentsu & Jantou) Every mahjong winning hand follows the same blueprint — 4 sets (mentsu) + 1 pair (jantou). Learn how sequences, triplets, and pairs combine, with examples of valid and invalid hands. #sets #pair Jan 16, 2025 About 5 min read