>>55865159If it's closed it hard locks your hand, you can't change it and that's not good.
It adds another dora, potentially giving more points to the other players.
If it's open then you opened your hand for no reason, closed hands are worth more.
Chankan is such a fun yaku to deal into.
You only call kan if you are in tenpai, or 1 away from tenpai, or if you're fishing for fu, or anothe retardedly specific scenarios idk. People who call kan every time the button pops up only do it because Saki impregnated their minds or they have brain worms.
