This closed hand accepts a 1, 2, 4, 5, or 7 souzu tile.

If a 1 souzu is dropped, it’s 6 han and 30 fu for 6,000 points for a tsumo (haneman) and 5 han and 40 fu for 12,000 points on a ron (mangan). With the the ron, it’s a straight and a half-flush, but a tsumo gets you and additional han for the self-draw. It’s less points for the tsumo due to the lack of a ron basically.

Now if that hand is declared as a riichi, it’s an additional han and pushes it up to 18,000 if I get a ron and still 6,000 on a tsumo. The next best tile in lieu of a 1 souzu is if a red 5 souzu is dropped which should give 12,000 I believe.

If a 4, non-red 5, or 7 souzu is dropped, it comes out to a 8,000 point hand if you land a ron and I think 6,000 if it is a tsumo.

The south wind only has value beyond 1 han if you land a ron unless it is your seat wind and or round wind. If you are in south and you are sitting south, this hand becomes 24,000 points on a ron and 8,000 on a tsumo. It should be 18,000 on a ron for the red 5 souzu.

You basically want a 1 or red 5 souzu tile to drop from another player to get that hit. The only thing which makes the hand sweeter is if you hit someone on the last drop, you flip a kan on the south winds, get some closed and or open dora to make say the six or south stronger, and so forth. As an opposing player, this hand is an outright nightmare and if done early enough on, it’s likely a guaranteed win.

Calculating mahjong hands sucks a lot so if you see a problem with how I scored this, by all means provide a better calculation! That said, this was east 2 and my seat was west so I wasn’t going to get a lot out of my honour tiles.

I got a tsumo on it.