Every set is a run.
All four sets are chows, and the hand ends with an ordinary pair. A chow is a run of three consecutive tiles in one suit.
A single pung breaks the pattern, and so does a kong, because a kong is a triplet with a fourth tile. The pair can be anything, including an honour.
Chows are the cheapest sets to finish, because a run completes from either end. Most hands drift toward Common Hand without being aimed there. The real decision comes when you could pung a pair instead.
That pung ends any chance of this faan. It is only worth taking for a dragon, your seat wind, or the round wind.
Common Hand is about the shape of your sets, not about staying concealed. Four chows still score it after you have claimed discards to build them. People confuse it with Concealed Hand, which is the opposite idea. You can hold both at once for two faan.
It sits on top of suit patterns cleanly. Four chows in one suit with honours is Common Hand plus Mixed One Suit, one plus three, so four faan. In one suit with no honours it joins Pure One Suit for eight. It can never combine with All Pungs, which requires the shape it forbids.
Can the pair be a dragon or a wind?
Yes. Only the four sets must be chows. An honour pair is fine. A dragon pair also counts toward Small Dragons if you hold two dragon pungs.
Does claiming a discard cost me Common Hand?
No. Claiming a chow keeps the pattern. What claiming costs you is Concealed Hand, which is a separate faan.
Is a kong allowed?
No. A kong is four identical tiles, a triplet at heart. It breaks the all-chows rule exactly as a pung does.
Play Mahjong Winds
Every win shows its faan line by line, using the table on this page.