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Tile efficiency: Difference between revisions
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{| class="wikitable" width=40% | {| class="wikitable" width=40% | ||
!Type !! align=center| Ryanmen !! align=center| Kanchan !! align=center| Penchan | |||
! align=center| Ryanmen !! align=center| Kanchan !! align=center| Penchan | |||
|- | |- | ||
!Incomplete | !Incomplete | ||
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|} | |} | ||
All else equal, a ryanmen is twice as good as the other joints, because they accept twice as many tiles. Kanchans can be upgraded to ryanmens (e.g. 24-pin, after drawing 5, turns into 45-pin). | All else equal, a ryanmen is twice as good as the other joints, because they accept twice as many tiles. Kanchans can be upgraded to ryanmens (e.g. 24-pin, after drawing 5, turns into 45-pin), so they are better than penchan. | ||
===Toitsu=== | ===Toitsu=== | ||
{{main|Toitsu}} | {{main|Toitsu}} | ||
'''Toitsu''' are pairs. Most hands need 1 pair to win. Pairs can be used to create [[triplet]]s, though, so having multiple pairs can increase efficiency. | '''Toitsu''' are pairs - 2 copies of the same tile. Most hands need 1 pair to win. Pairs can be used to create [[triplet]]s, though, so having multiple pairs can increase efficiency. | ||
{| class="wikitable" width=15% | |||
! align=center| Pair | |||
|- | |||
| align=center| {{#mjt:11p}} | |||
|} | |||
===Complex joints=== | ===Complex joints=== | ||
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{| class="wikitable" | {| class="wikitable" | ||
!Type | !Type | ||
! align=center| Ryanmen + Pair !! align=center| Kanchan + Pair !! align=center| Ryankan | |||
|- | |- | ||
!Incomplete | !Incomplete | ||
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==Important concepts== | ==Important concepts== | ||
The general ideas of tile efficiency are: | |||
*Discard the tiles that have the fewest amount of upgrades | |||
*Prefer increasing tile acceptance at 1-shanten than before 1-shanten | |||
*Try to get a good wait at [[tenpai]] | |||
*Prefer ryanmen over other types of joints | |||
===Isolated tile utility=== | ===Isolated tile utility=== | ||
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In order of least useful to most: | In order of least useful to most: | ||
{| class="wikitable" | {| class="wikitable" | ||
!Type !! Pair !! Ryanmen !! Kanchan !! Penchan !! Total | |||
|- | |- | ||
!Wind ({{#mjt:4z}}) | !Wind ({{#mjt:4z}}) | ||
|{{#mjt:4z}} (3 tiles) || colspan=3| 0 tiles || 3 tiles | |{{#mjt:4z}} (3 tiles) || colspan=3| 0 tiles || 3 tiles | ||
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|- | |- | ||
!3 thru 7 ({{#mjt:3p}}) | !3 thru 7 ({{#mjt:3p}}) | ||
|{{#mjt:3p}} (3 tiles) || {{#mjt:2p}} / {{#mjt:4p}} (8 tiles) || {{#mjt: | |{{#mjt:3p}} (3 tiles) || {{#mjt:2p}} / {{#mjt:4p}} (8 tiles) || {{#mjt:1p}} / {{#mjt:5p}} (8 tiles) || 0 tiles || 19 tiles | ||
|} | |} | ||
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*A {{#mjt:2233m}} shape can be treated as two separate {{#mjt:23m}} ryanmen. However, they both accept the same tiles ({{#mjt:14m}}), so doing this isn't as efficient. The shape can be decent, since it has a ryanmen wait once you reach [[tenpai]], | *A {{#mjt:2233m}} shape can be treated as two separate {{#mjt:23m}} ryanmen. However, they both accept the same tiles ({{#mjt:14m}}), so doing this isn't as efficient. The shape can be decent, since it has a ryanmen wait once you reach [[tenpai]], but fishing for the [[iipeikou]] will slow down the hand. This shape can also be considered as 2 pairs. | ||
===Two pairs=== | ===Two pairs=== | ||
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When you are likely to [[pon]] one of the triplets (e.g. [[yakuhai]] pair), then keeping 3 pairs can be good, since you'll be at 2 pairs once you make the pon. | When you are likely to [[pon]] one of the triplets (e.g. [[yakuhai]] pair), then keeping 3 pairs can be good, since you'll be at 2 pairs once you make the pon. | ||
Also, when you have an open hand, keeping pairs is relatively stronger than normal. This is because you can pon with any player's discard, but [[chii]] can only be done to the player to the left. | Also, when you have an open hand, keeping pairs is relatively stronger than normal. This is because you can pon with any player's discard, but [[chii]] can only be done to the player to the left. Pairs of tiles likely to be discarded, like guest winds or 1s/9s, are better. | ||
When you have too many pairs, it's often best to turn a 'ryanmen + pair' into a normal ryanmen (e.g. from 778, discard a 7 to get 78). Ryanmen are already good to wait on, so they do not need the "improvement" as much. Then, discard pairs | |||
If you have 4 pairs you might want to consider [[chiitoitsu]], but if a sequence or triplet forms, you should probably discard a pair and go for a normal hand. At 5 pairs, you're at 1-shanten for chiitoitsu, so you should likely go for that. | If you have 4 pairs you might want to consider [[chiitoitsu]], but if a sequence or triplet forms, you should probably discard a pair and go for a normal hand. At 5 pairs, you're at 1-shanten for chiitoitsu, so you should likely go for that. | ||
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It may be tempting to see the 4 or 7 as just an isolated tile. Technically, it is, but '''it can also be seen as a (45) ryanmen + (67) ryanmen'''. This shape accepts: | It may be tempting to see the 4 or 7 as just an isolated tile. Technically, it is, but '''it can also be seen as a (45) ryanmen + (67) ryanmen'''. This shape accepts: | ||
*{{#mjt:29p}} to create [[kanchan]] + sequence ({{#mjt:24p}} + {{#mjt:567p}} | *{{#mjt:29p}} to create [[kanchan]] + a sequence ({{#mjt:24p}} + {{#mjt:567p}}) | ||
*{{#mjt:3658p}} to create [[ryanmen]] or better ({{#mjt:34567p}} / {{#mjt:456p}} + {{#mjt:67p}}) | *{{#mjt:3658p}} to create [[ryanmen]] or better + a sequence ({{#mjt:34567p}} / {{#mjt:456p}} + {{#mjt:67p}}) | ||
*{{#mjt:47p}} to create a pair. ({{#mjt:44567p}}) | *{{#mjt:47p}} to create a pair. ({{#mjt:44567p}}) | ||
In other words, it is an ''extremely strong'' floating tile. The ryanmen acceptance is about twice that of a normal 4 or 7! Therefore, keeping this shape is very powerful if your hand's joints are not entirely composed out of ryanmen-or-better. It's also great to keep if you need a pair even if you have all ryanmens. | In other words, it is an ''extremely strong'' floating tile. The ryanmen acceptance is about twice that of a normal 4 or 7! Therefore, keeping this shape is very powerful if your hand's joints are not entirely composed out of ryanmen-or-better. It's also great to keep if you need a pair (even if you have all ryanmens). | ||
Note: When this shape contains a terminal tile (1 or 9), it becomes much worse. It's still good if you need a pair, but the ryanmen acceptance drops to a normal 4 or 7. | Note: When this shape contains a terminal tile (1 or 9), it becomes much worse. It's still good if you need a pair, but the ryanmen acceptance drops to a normal 4 or 7. | ||
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Like the nobetan, the "bulging" shape can be seen as a floating 5, or a (45) ryanmen + (56) ryanmen. It accepts: | Like the nobetan, the "bulging" shape can be seen as a floating 5, or a (45) ryanmen + (56) ryanmen. It accepts: | ||
*{{#mjt:3647p}} to create [[ryanmen]] ({{#mjt: | *{{#mjt:3647p}} to create [[ryanmen]] + sequence ({{#mjt:345p}} + {{#mjt:56p}} / {{#mjt:44556p}}) | ||
*{{#mjt:5p}} to create a pair. ({{#mjt:456p}} + {{#mjt:55p}}) | *{{#mjt:5p}} to create a pair. ({{#mjt:456p}} + {{#mjt:55p}}) | ||
There's no kanchan, so the acceptance is slightly worse than a nobetan. However, the ryanmen acceptance is still about twice that of normal floating tiles. Because this shape nearly guarantees 2 ryanmen when used, it's great if you're going for [[pinfu]]. The chance for [[iipeikou]] also helps. If you already have all ryanmens, there's not much need to keep the bulging shape intact (discard the middle tile). | There's no kanchan, so the acceptance is slightly worse than a nobetan. However, the ryanmen acceptance is still about twice that of normal floating tiles. Because this shape nearly guarantees 2 ryanmen when used, it's great if you're going for [[pinfu]]. The chance for [[iipeikou]] also helps. If you already have all ryanmens, there's not much need to keep the bulging shape intact (discard the middle tile). | ||
Note: It's good to have a pair when you have a bulging shape. | Note: It's good to have a pair when you have a bulging shape. Also, like the nobetan, this shape becomes much worse if it contains a terminal tile. | ||
===Extended Ryankan=== | ===Extended Ryankan=== | ||
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|} | |} | ||
The 245679 accepts {{#mjt: | The 245679 accepts {{#mjt:3p}} or {{#mjt:8p}} to complete the 2nd sequence. Drawing a {{#mjt:5p}} or {{#mjt:6p}} upgrades it to a ryanmen. | ||
The 455679 can be seen as 456 + 579 or as 45 + 567 + isolated 9. It accepts {{#mjt:368p}} to complete a second sequence. | The 455679 can be seen as 456 + 579 or as 45 + 567 + isolated 9. It accepts {{#mjt:368p}} to complete a second sequence. | ||
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In other cases, players may end up simply having tenpai in mind, especially as the hand nears the later discards. This is of particular concern for the current [[dealer]], who may have an interest in retaining the position and [[Renchan|repeat the hand]]. | In other cases, players may end up simply having tenpai in mind, especially as the hand nears the later discards. This is of particular concern for the current [[dealer]], who may have an interest in retaining the position and [[Renchan|repeat the hand]]. | ||
==Sakigiri== | |||
{{main|Sakigiri}} | |||
[[Sakigiri]] is the practice of discarding dangerous tiles before opponents reach tenpai. Often, the term "sakigiri" means sacrificing tile efficiency for the sake of better defense. | |||
Even when going for maximum efficiency, it's good to know the ideas behind sakagiri. Specifically, when two tiles are equally useless, you should discard the tile that is more dangerous first. | |||
* {{#mjt:24m12345p5789s22z}} Draw: {{#mjt:4s}} | |||
In this case, the 24-man [[kanchan]] is no longer useful to the hand. The hand will discard both 2-man and 4-man once it reaches tenpai. As the 4-man is a middle tile, it is more dangerous, so it should be discarded first. | |||
* {{#mjt:24m12368p5789s22z}} Draw: {{#mjt:4s}} | |||
Here, the 4-man ''is'' useful. The hand has a non-ryanmen joint, so you want to keep the 4-man because it could be used to upgrade the hand (if you draw 5-man, you get a 45-man ryanmen, allowing you to get rid of the 68-pin kanchan). Here, the better move is to discard 2-man (or 8-pin). | |||
== External links == | == External links == | ||