Which Mahjong rules are used in Final Romance II ?

[Djidjo]

Hi folks,

I play Mahjong with friends from time to time (4 players), but when I play on my Saturn (Final Romance 2), I'm a bit irritated because sometimes I HAVE Mahjong but the Saturn says I don't.

Mahjong for me is : 4 combinations + 1 pair

Combination = 3 following each other or 3 the same or 4 the same

Do you know which rules really applies ? I know there are thousand ones :/

Thanks !

Djidjo