Counting fu

The fu checklist

Start at 20 fu, add, then round up to the next 10:

• Closed hand won by ron: +10. Self-draw: +2.
• Triplets: 2 (open simple), 4 (open 1/9/honor, or closed simple), 8 (closed 1/9/honor). Quads: four times that.
• A pair of value tiles: +2.
• A closed, edge or single-tile wait: +2.

You are in riichi and win by ron on 2. Build the fu.

1 2 3 7 7 1 3 9 9 9 4 5 6 2

Ron from across Riichi

1. Base fu 202530

Open hands

2 3 4 6 7 8 1 1 9 9 Wh Wh Wh

No +10 for an open ron, and a triplet completed by ron counts as open. Open hands often land on 30.

You called pon on white dragons and win by ron on 9. Build the fu.

2 3 4 6 7 8 1 1 9 9 9

Wh Wh Wh

Ron from right

1. Base fu 202530

Pinfu by self-draw

Pinfu by ron is 30 fu (20 + 10). By self-draw it is fixed at 20: the +2 is not added.

Seven pairs

Seven pairs has its own fixed fu, never rounded.

A quick estimate

Most hands land on a few values: pinfu 30 by ron, seven pairs 25, an open hand about 30, any other closed hand about 40 by ron (30 by self-draw). Count exactly when the hand has a quad or a closed triplet of 1s, 9s or honors.

A closed hand with all simples wins by ron on a closed wait. What is it worth?

4 6 8 8 2 3 4 5 6 7 4 5 6 5

Ron from across

1 han 30 fu1 han 40 fu1 han 50 fu2 han 40 fu