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Tile efficiency: Difference between revisions
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+note on 2 pairs
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! align=center| Ryanmen !! align=center| Kanchan !! align=center| Penchan | |||
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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]], and you can make either 2-man or 3-man into a triplet. But fishing for the [[iipeikou]] will slow down the hand. | *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]], and you can make either 2-man or 3-man into a triplet. But fishing for the [[iipeikou]] will slow down the hand. | ||
===Two pairs theory=== | |||
A hand needs 1 pair to win. When you have 2 pairs, either pair can be turned into a triplet, increasing tile acceptance by 4. When you have 3 pairs, one extra pair can be turned into a triplet, increasing tile efficiency by only 2. Therefore, keeping 2 pairs (ideally 1 as part of a 'ryanmen + pair' complex joint) is strong. Refer to the following tables: | |||
{| class="wikitable" | |||
|- | |||
!# Pairs !! Shape !! Tile acceptance | |||
|- | |||
|1 || {{#mjt:22p000000000z}} || 0 tiles | |||
|- | |||
|2 || {{#mjt:22p22m000000000z}} || {{#mjt:2p2m}} (4 tiles) | |||
|- | |||
|3 || {{#mjt:22p22m33s0000000z}} || {{#mjt:2p2m3s}} (6 tiles) | |||
|} | |||
{| class="wikitable" | |||
|- | |||
!# Pairs !! Shape !! Tile acceptance | |||
|- | |||
|1 || {{#mjt:23m22p78s0000000z}} || {{#mjt:14m69s}} (16 tiles) | |||
|- | |||
|2 || {{#mjt:23m22p778s0000000z}} || {{#mjt:14m2p689s}} (20 tiles) | |||
|- | |||
|3 || {{#mjt:223m22p778s0000000z}} || {{#mjt:124m2p689s}} (22 tiles) | |||
|} | |||
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. Triplets of tiles likely to be discarded, like guest winds or 1s/9s, are better. | |||
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. | |||
==Yaku== | ==Yaku== | ||