Aotenjou

Aotenjou 「青天井」 is a non-standard scoring system, by which all caps and limits are removed. Per the scoring equation, han is factored exponentially in the equation:

Basic points = fu × 2^{(2 + han)}

Normally, the point equation has a cap applied at mangan, where the basic points is artificially maxed at 2000 points. Subsequent point values are then multiples of mangan for higher scoring hands.

With aotenjou, there is essentially no limit. The basic points have the freedom to be valued as high as possible, as the mangan limit is removed. Under aotenjou, scoring produces some ridiculously high numbers. Points are even much higher in conjunction with the multipliers applied for the dealer, non-dealer, and ron vs. tsumo wins. All yaku retain their original values. In additionally, yakuman patterns are defaulted at 13 han and are treated like normal yaku when determining the overall han and fu values. Furthermore, any han applied by dora counts as well to further increase the point values.

Hence, for this very reason, the scoring limits imposed by both mangan and yakuman are normally used.

Extreme scoring examples

Kokushi musou

+

This hand is then scored as 13 han 30 or 40 fu. By dealer, it is worth 7,864,400 (ron) or 1,966,080 all (tsumo).

Shousuushii + Tsuuiisou

Agari: or

With aotenjou, every aspect of this hand is considered, not just the yakuman patterns. This hand also includes the regular yaku of toitoi and sanankou as well as two or three yakuhai when applicable. This hand stands at 31 han and 50 fu via tsumo:

13 han from shousuushii
13 han from tsuuiisou
2 han from sanankou
3 han from the maximum number of yakuhai possible
Basic points: 4.29 × 10¹¹

Any dora to these examples definitely increases the hand even further.

Upper limit

The exponential basic points equation does have an upper limit, imposed by the maximum possible han and fu combination. This cap only exists due to the maximum capacity with the finite tile count per hand. Per the rule variations, the rules are applied to produce the maximum hand possible.

In a hypothetical ruleset with double yakuman, the maximum scoring hand would consist of the following, assuming the player is dealer, it's the East round, and with the yaku of riichi, ippatsu, tsumo, haitei.

, tsumo agari dora uradora

This hand's fu value would be calculated with:

32 fu for closed terminal/honor kan * 4 kan = 128 fu
2 fu for pair of terminal/honor = 130 fu
2 fu for tanki wait = 132 fu
2 fu for menzen tsumo = 134 fu, for a total of 140 fu.

The han value of this hand would be calculated with:

13 han for Daisangen = 13 han
13 han for Tsuuiisou = 26 han
13 han for Suukantsu = 39 han
26 han for Suuankou Tanki = 65 han
1 han for Riichi = 66 han
1 han for Ippatsu = 67 han
1 han for Tsumo = 68 han
1 han for Haitei Raoyue = 69 han
2 han for Double Ton = 71 han
24 han for 24 Dora = 95 han

The basic points of this hand would be 2.22 × 10³¹ and the dealer upon tsumo would receive 1.33 × 10³² points.

External links

青天井ルール

青天井 in Japanese Wikipedia