Start with the size of the group
A pung has three matching tiles, a kong four, a quint five and a sextet six. Jokers can fill missing tiles in these groups when the whole hand matches the card. A single and a pair must contain their required natural tiles.
For example, 7 dots, 7 dots and a joker can be a pung of 7 dots. One 7 dots and a joker cannot be the pair of 7 dots a line requires. The joker’s flexibility belongs to a permitted group; it does not make any incomplete hand legal.
There are only four natural copies of each numbered tile, wind and dragon in our set. A quint or sextet of one of those identities therefore needs jokers. Flowers work differently: the eight flower and season tiles act as interchangeable flowers in American play here.
Why pairs change your planning
Imagine a line needs a dragon pair and several pungs. You already hold one required dragon and two jokers. Those jokers can help the pungs but cannot solve the dragon pair. Another natural dragon may be the harder missing tile, even though it looks less impressive than a joker.
When comparing lines during the Charleston, count the required natural singles and pairs separately. Ask how many you already hold and whether discarded or exposed tiles make the rest difficult to obtain. This helps you avoid choosing a hand solely because you have flexible tiles.
Exchange an exposed joker in four steps
- Find the identity. An exposed group of 1 bamboo, 1 bamboo and a joker represents 1 bamboo.
- Check your rack. You need a natural 1 bamboo. A different number or suit will not work.
- Wait for your eligible turn. In our game, make the exchange after drawing or making a permitted call, before discarding.
- Swap the tiles. Your natural tile enters the exposure and the joker enters your rack. Neither player receives an extra tile.
The exposed joker may belong to another player or to your own exposure. Exchanging is not taking a joker from someone’s private rack. Our lesson shows the exact swap; the receiving exposure stays the same size.
A worked exchange that completes a hand
Consider a separate Crosswind example. Your rack has two 1 bamboo; pungs of 1 characters, 1 dots and East; a natural red dragon pair; and a loose 7 bamboo. That is 14 tiles, but the 7 bamboo occupies the place of a missing 1 bamboo.
| Before | Your move | After |
|---|---|---|
| Another player exposes 7 bamboo, 7 bamboo, joker. | Exchange your natural 7 bamboo for that joker on your eligible turn. | Their exposure has three natural 7 bamboo. |
| Your 1 bamboo pung has only two natural tiles. | Use the received joker in that pung. | Two 1 bamboo + joker complete it; all other groups already fit Crosswind. |
This hand now matches the card. Change only one detail—replace your second red dragon with an unrelated tile—and the exchange no longer wins: the natural pair is still incomplete. Check the whole recipe after a swap, not just the group the joker repairs.
Passing and discarding are different
You cannot send jokers in the Charleston or courtesy exchange. During ordinary play, a joker can be discarded, but nobody can claim that discarded joker, even to complete a win. Watch the tile’s current location: an exposed joker and a discarded joker have different possibilities.
You also cannot call a natural discard merely to use it for a joker exchange. A call must itself complete a legal exposure or the entire winning hand. If the tile is useful only as an exchange token, that does not create a separate right to claim it.
Practice the identity check
Open the joker lesson and select the matching 1 bamboo for the visible pung. Then explain why a 1 dots would fail despite having the same number. Suit and number both identify the tile.
Before exchanging, answer three questions: “Does my natural tile match this exposed group? Is it my eligible turn? Which part of my own hand will the joker help?” A matching number in another suit fails the first check. A tile discarded by somebody else does not automatically become yours to swap. For that distinction, read when a discard can be called.