Reachmahjong.com are hosting a freeroll for $200 but despite reach mahjong being the only way to play, they’re using HK rules for this tournament.
I decided to practice in another daily(?) freeroll and somehow I won 12 bux even though I’ve never played this ruleset before.

That’s because you’re simply awesome. You go~
Hong Kong rulesets may be a bit confusing online, let alone real life.
Well, the tournament’s over, and I’ll say this: they wouldn’t be able to pay me $100 to go back to that client. Also, HK rules were, as I suspected, really, really not something for me.