Pure One Suit (清一色)
2 fan
Pure One Suit — every tile in the hand is from a single suit. Common in Sichuan since you're already committed to discarding one suit entirely.
Example winning hand
Winning tile: 5m
Other 2-fan patterns
Pure One Suit — every tile in the hand is from a single suit. Common in Sichuan since you're already committed to discarding one suit entirely.