Ooyamaneko.net

Only wining hands are scored.
All players at the table are responsible for ensuring that winning hands are scored correctly and to the maximum points.

First find the number of han: add the number of han given by the yaku (at least one), the number of dora tiles, kan dora tiles, and in case of a riichi winning hand the number of ura dora. This sum is the han value of the hand.

Then the base value of the hand, the minipoints (fu), is calculated. Round the number of minipoints up to the next 10. (e.g. 32 minipoints are rounded up to 40). In case of a seven pairs hand, the hand worth 25 minipoints and there is no rounding up.

• For hands worth less than five han, the minipoints rounded up are doubled by the number of han plus 2, giving the base value of the hand. This base value is limited to 2000 points.
A base value of 1920 points, being close to mangan, is rounded up to 2000 points.

• For hands with five or more han, the minipoints are irrelevant. The score should be read on the scoring tables:

Han	Name	Base value
5	Mangan	2000
6, 7	Haneman	3000
8, 9, 10	Baiman	4000
11 and more	Sanbaiman	6000

• For yakuman hands, the base value is 8000.
There is no counted yakuman: a hand worth 13 or more han but not having a yakuman yaku is only rewarded sanbaiman.

• In case of winning on a self-draw, the base value is to be paid by all three opponents.
For East, however, the value is doubled one more time. East receives double payment, but also pays twice the amount of the base value in case of an opponent’s self-draw.
• In case of winning on a discard, the discarding player must pay for all opponents, including East, i.e. four times the base value if the winner is not East, and three times the doubled base value if the winner is East.

Payments are rounded up to the next 100.

To the hand value are added 100 for each continuance counter on the table in case of self-draw, and 300 in case of winning on a discard.
In addition, the riichi bets on the table are collected by the winner.

If a player score goes below zero, the game continues. The player will have a negative score and plays normally (he can declare riichi, he can pay the other players, ...).

When a player has two visible kōtsu and/or kantsu of dragons and another player feeds him a third melded kōtsu / kantsu of dragons, the feeding player is liable if the player wins with the Big Three Dragons yakuman.

When a player has three visible kōtsu and/or kantsu of winds and another player feeds him a fourth melded kōtsu / kantsu of winds, the feeding player is liable if the player wins with the Big Four Winds yakuman.

A kōtsu / kantsu is visible if it is melded or if it is a concealed kantsu.

If the player wins by self-draw, the liable player must pay the full value of the hand, including all continuance counters points.
If the player wins by claiming a tile, the liable player shares the payment equally with the discarder of the winning tile. Only the discarder pays the continuance counter points.
The feeding player is still liable even if the hand also qualifies for another yakuman.

There is no liability for feeding a Four Kantsu or an After a Kantsu yaku.

	Fu
Winning	20
Seven pairs	25	No other fu are added.
Winning on a discard on a concealed hand	10
Winning by self-draw	2	Not counted in case of pinfu yaku.
Edge wait	2	Winning on the 3 or 7 tile of an 1-2-3 or 7-8-9 shuntsu.
Middle wait	2	Winning on the central tile of a shuntsu.
Pair wait	2	Winning on a tile completing a pair.
Open pinfu	2	Awarded when an open hand worth no minipoints beside the 20 minipoints for winning.

	Middle tiles	Terminals and honours	Valuable honour	Double wind
Shuntsu	0	0	-	-
Melded kōtsu	2	4	4	4
Concealed kōtsu	4	8	8	8
Melded kantsu	8	16	16	16
Concealed kantsu	16	32	32	32
Pair	0	0	2	4

If the winning tile finishes a kōtsu, it counts as a concealed kōtsu in case of self-draw, and it counts as a melded kōtsu in case of winning on a discard.

The two minipoints for edge, closed or pair wait can be claimed even if the hand is waiting for other tiles. Edge wait is 1-2 waiting for 3 or 8-9 waiting for 7. Closed wait is waiting for the centre tile of a shuntsu. Pair wait is waiting to finish the pair.

When there are several ways to score the hand, the highest-scoring possibility must always be chosen. The score can be corrected as long the hand is still intact or if all players agree.
In special cases like  , even though it is only possible to win on , no minipoints can be claimed since the tile finishes neither an edge wait, a closed wait nor a pair wait.

The winning player gets one han for each dora in his hand.
If several dora indicators points to the same tile, the dora is counted for each indicator.
For example, if the initial dora indicator is , and a kan dora indicator is also , and the winning player have a kōtsu in his hand, then he have 6 dora, giving 6 han.

Active dora come from:
• The initial dora indicator.
• Kan dora indicators: i.e. dora indicators revealed for each kantsu, whatever the kantsu were made by the winning player or by another player.
• Ura dora indicators: i.e. dora indicators beneath other active dora indicators; only if the winning player has declared riichi.

When a kantsu is declared, the kan dora indicator must be revealed before the player discards.
• If a player wins by robbing a kantsu, there is no kan dora indicator for the robbed kantsu. Indeed, the robbed kantsu was not completed. If the dora indicator was already revealed before the win is declared, the indicator is turn-back face down.
• If a player wins on the replacement tile after a kantsu, the kan dora indicator is revealed.