The current Hong Kong standard — 港式清章, known in English as Hong Kong Old Style or HKOS — as its own preset: 144 tiles with eight flowers, no win below three faan, a 13-faan limit, full-chung payment and the half-spicy ladder.
Seasons and plants are revealed the moment they are drawn and replaced from the tail of the wall, scoring seat flowers, a full set and no-flower bonuses.
A hand below three faan cannot be declared; limit hands such as thirteen orphans and big four winds are a fixed 13 faan.
The discarder pays four units alone; on a self-draw all three pay two units each. Units follow the half-spicy ladder that slows after four faan.
Hong Kong uses 144 tiles with flowers, a three-faan minimum, a 13-faan cap and full-chung payment. The Guangdong gai ping wu and tui dao wu presets use 136 tiles with the horse bonus and instant kong settlement, and are offered separately.
The win is simply not offered and play continues. Self-draw, concealed hand, all-chow, flowers and wind or dragon pungs add faan toward the minimum.
Yes. Hong Kong Old Style, HKOS, 港式麻雀 and 香港麻雀 all refer to the same current Hong Kong thirteen-tile standard.
The rule spec defines options for half-chung payment, an 8 or 10 faan cap, a one-faan minimum and the full-spicy ladder. Games currently use the Hong Kong standard defaults (full chung, 13-faan cap, 3-faan minimum, half-spicy ladder); an option picker is planned.