Concealed Hand

Mahjong Variant	Value
Chinese Classical	Never
New Style	See Below
Japanese Classical	Always (10 Fu)
HK Old Style	Rare
Guangdong Style	Always
Taiwanese	Always
Chinese Official MCR	2 "Fan"
Guangdong MCR	1 Point
Japanese Riichi	30 Fu
Let's Mahjong!	1 Fan
Zung Jung	5 Points

Concealed Hand (Self-Drawn Hand, Closed Ron) is an incidental win. All tiles in a player's hand must be self-drawn except for the winning tile. The player cannot have any open chows, pungs, or kongs.
Rulesets that also use Fully Concealed Hand require that Concealed Hand be won off of a discard.

By Mahjong Variant

New Style

Given its absence from 1920s Chinese Classical rulesets, but its inclusion in 1930s Japanese Classical rulesets; we can assume early rulesets never included it, and later rulesets most likely always included it.

Chinese Official MCR, Guangdong MCR and Japanese Riichi

When combined with Seven Pairs only the points from Seven Pairs are counted.

Guangdong MCR and Zung Jung

These rulesets do not recognize Fully Concealed Hand. Therefore, Concealed Hand can be achieved regardless if the winning tile was self-drawn or called.

See Also

This incidence is in a group with three other related incidences…

	All Melds Were…	The Winning Tile Was…
Concealed Hand	Concealed	Exposed
Fully Concealed Hand	Concealed	Concealed
Exposed Hand	Exposed	Concealed
Fully Exposed Hand	Exposed	Exposed