- Keep track of which groups in the winning hand are concealed and which were open (revealed).
- Calculate base points (consider each group one at a time). See base table below. Round up to next 10.
- Double the base a number of times to get the score for the round. See doubles table below.
- Cap the score at 1000 (the limit).
- If the winning tile came from a discard, each player pays the winner their score, and the loser pays double.
- If the winning tile came from the wall, all players pay the winner double the score.
- Losers do not score their hands.
| Base reason | Points |
|---|---|
| Mahjong | 20 |
| All concealed | +10 |
| Concealed kong dragon/wind/1/9 | +32 |
| Open kong dragon/wind/1/9 | +16 |
| Concealed kong 2-8 | +16 |
| Open kong 2-8 | +8 |
| Concealed pung dragon/wind/1/9 | +8 |
| Open pung dragon/wind/1/9 | +4 |
| Concealed pung 2-8 | +4 |
| Open pung 2-8 | +2 |
| Flower/season | +4 |
Round up base score to the next 10. e.g If you got 44, round up to 50 before doubling.
Doubles start at 0. (It is possible to win with 0 doubles.) The final doubles number will determine how many times you double the base score.
| Reason | Doubles |
|---|---|
| Dragon pung/kong | +1 ea |
| Round wind pung/kong | +1 |
| Own wind pung/kong | +1 |
| Own flower/season | +1 |
| All one suit, with at least one wind/dragon pung/kong (half flush) | +1 |
| All pungs/kongs | +1 |
| No flowers | +1 |
| All flowers | +3 +1 for own |
| All seasons | +3 +1 for own |
| All one suit, no winds/dragons (flush) | +4 |
After doubling a number of times, cap the final score at 1000.
Winning hand
- 3 red dragon concealed (pung)
- 3,4,5 circles concealed (chow)
- 1,1,1 circles open (pung)
- 7,8,9 circles open (chow)
- 6,6 (eye)
Base points
- 20 for winning
- +8 for concealed dragon pung
- +0 for chow
- +4 for open pung
- +0 for chow
- = 32
- Round up to 40
Doubles
- 1 for dragon pung
- 1 for half flush
- 1 for no flowers
- = 3 doubles
Score
- 40 doubled 3 times = 320
Payment (won on a discard)
- Each player pays winner 320
- Player who discarded the tile that caused mahjong pays 640
Payment (won from wall)
- Each player pays winner 640
- Removed points and doubles for improbable situations including all limit hands
- Round base up to next 10 to simplify doubling
- Do not score losing hands