Japanese mahjong scoring rules: Difference between revisions

Revision as of 10:18, 3 August 2013

Japanese mahjong features a very complex scoring system. Every mahjong hand has a value in terms of han and fu associated with them. The combination of han and fu then corresponds to values indicated from the scoring table, and/or the two numbers of han and fu factor into an equation, by which the scoring table is derived.

Scoring procedure

Calculating basic points

To determine the point value of a hand, the following procedure is used:

If the hand is a yakuman, then look up the 13 han values according to dealer or non-dealer numbers
Determine the hand's valid yaku
Count the han based on the yaku
Count any number of dora to the han count
If the han count is more than 5, counting fu is no longer necessary
If the han count is 4 or less, then count fu
After determining the number of han and/or fu, refer to the scoring table

For any who prefer to use the equation, the base point calculation is based on the following equation:

Basic points = fu × 2^{(2 + han)}

Payments

After determining the basic points, multiply based on the status as dealer and no-dealer as well as the win by ron or tsumo.

When a non-dealer wins by tsumo, the player earns 1 × basic points from the other non-dealers, rounded up to a full 100. The dealer in this case pays 2 × basic points, rounded up to a full 100.
When a non-dealer wins by ron, the discarding player pays the winner 4 × basic points, rounded up.
When the dealer goes out by tsumo, the dealer scores 2 × basic points from all players, rounded up.
When the dealer goes out by ron, the dealer earns 6 × basic points from the responsible non-dealer, rounded up.

Honba

In the event of ryuukyoku or a dealer win, the honba or tsumibou count increases by 1 for the next hand. If someone wins a hand and East does not, the honba count resets back to zero.

This count increases hand values increases by a total of 300 per honba. For ron, the discarder pays the additional 300 points. For tsumo, everyone pays an additional 100 each. These extra points are added to the hand value after the capping as mangan, haneman, etc., so a non-dealer mangan tsumo with 2 honba costs 2,200 for a non-dealer and 4,200 for the dealer.

In the case of sekinin barai, the yakuman tsumo payment is borne entirely by the discarder of the ponned tile, who also has to pay 300 per honba. On a ron, the yakuman value is split between the discarder of the winning tile and the discarder of the earlier ponned tile. Most rules have the winning tile discarder pay for all honba.

Scoring table

Dealer

Han/Fu	20	25	30	40	50	60	70	80	90	100	110
1 han	-- --	-- --	500 1500
2 han		--
3 han							4000 12000
4 han				4000 12000
Mangan (5 han)	4000 12000
Haneman (6,7 han)	6000 18000
Baiman (8,9,10 han)	8000 24000
Sanbaiman (11,12 han)	12000 36000
Yakuman (13+ han)	16000 48000

Nondealer

Han/Fu	20	25	30	40	50	60	70	80	90	100	110
1 han	-- --	-- --
2 han		--
3 han							2000(4000) 8000
4 han			2000(3900) 7700	2000(4000) 8000
Mangan (5 han)	2000(4000) 8000
Haneman (6,7 han)	3000(6000) 12000
Baiman (8,9,10 han)	4000(8000) 16000
Sanbaiman (11,12 han)	6000(12000) 24000
Yakuman (13+ han)	8000(16000) 32000

External links

@@ Line 1: / Line 1: @@
 [[Japanese mahjong]] features a very complex scoring system.  Every mahjong hand has a value in terms of ''han'' and ''fu'' associated with them.  The combination of ''han'' and ''fu'' then corresponds to values indicated from the scoring table, and/or the two numbers of ''han'' and ''fu'' factor into an equation, by which the scoring table is derived.
-==Scoring procedure==
+== Scoring procedure ==
+=== Calculating basic points ===
 To determine the point value of a hand, the following procedure is used:
 # If the hand is a [[List of yaku|yakuman]], then look up the 13 han values according to dealer or non-dealer numbers
@@ Line 15: / Line 18: @@
 : '''Basic points = fu × 2<sup>(2 + han)</sup>'''
-After determining the basic points, factor based on the status as dealer and no-dealer as well as the win by ron or tsumo.
+=== Payments ===
+After determining the basic points, multiply based on the status as dealer and no-dealer as well as the win by ron or tsumo.
+*When a non-dealer wins by tsumo, the player earns 1 × basic points from the other non-dealers, rounded up to a full 100.  The dealer in this case pays 2 × basic points, rounded up to a full 100.
+*When a non-dealer wins by ron, the discarding player pays the winner 4 × basic points, rounded up.
+*When the dealer goes out by tsumo, the dealer scores 2 × basic points from all players, rounded up.
+*When the dealer goes out by ron, the dealer earns 6 × basic points from the responsible non-dealer, rounded up.
+=== Honba ===
+In the event of [[ryuukyoku]] or a dealer win, the '''honba''' or '''tsumibou count''' increases by 1 for the next hand. If someone wins a hand and East does not, the honba count resets back to zero.
+This count increases hand values increases by a total of 300 per honba.  For ron, the discarder pays the additional 300 points.  For tsumo, everyone pays an additional 100 each. These extra points are added to the hand value after the capping as mangan, haneman, etc., so a non-dealer mangan tsumo with 2 honba costs 2,200 for a non-dealer and 4,200 for the dealer.
-*When a non-dealer wins by tsumo, the player earns 1 × basic points from the other non-dealers.  The dealer in this case pays 2 × basic points.
+In the case of [[sekinin barai]], the yakuman tsumo payment is borne entirely by the discarder of the ponned tile, who also has to pay 300 per honba. On a ron, the yakuman value is split between the discarder of the winning tile and the discarder of the earlier ponned tile. Most rules have the winning tile discarder pay for all honba.
-*When a non-dealer wins by ron, the discarding player pays the winner 4 × basic points.
-*When the dealer goes out by tsumo, the dealer scores 2 × basic points from all players.
-*When the dealer goes out by ron, the dealer earns 6 × basic points from the responsible non-dealer.
 ==Scoring table==
@@ Line 170: / Line 183: @@
 |yakumanron=32000
 }}
-==Honba==
-In the event of [[ryuukyoku]] or the dealer wins a hand, the '''honba''' count increases by 1.  This means, the point values for the next hand increases by a total of 300.  For ron, the singular player pays the additional 300 points.  For tsumo, everyone pays an additional 100 each.  If the honba count continues to increase, then the honba count acts as a multiplier to the 300 points.  If a seat rotation occurs, that does not involve [[chombo]], then the honba count resets back to zero.
 ==External links==
 [[Category:Game rules]]