Tilebird

Joker exchange

When and how can I swap my tile for an exposed Joker?

Jokers More about jokers

Question 1 of up to 2

Is it your turn, and have you already drawn from the wall — or called a discard and finished that exposure — but not yet discarded?

Read every possible ruling for this situation

Exchange ok

Go ahead — the exchange is allowed

Standard rule
Go ahead. On your turn, after you have your 14th tile and before you discard, you may trade a matching natural tile for a Joker in any exposure on the table — another player’s or your own. You may make as many exchanges as you have matching tiles, from any number of racks. Say what you are doing, hand your tile to the owner of the exposure rather than reaching onto their rack, and let them hand you the Joker; a correct exchange cannot be refused. The Joker goes into your concealed tiles — you do not have to expose anything, and a concealed hand may exchange like any other. Then discard, or declare Mah Jongg if the Joker completes your hand. One limit: a Joker you pick up this turn cannot be added to an exposure you made this same turn.
Why
A Joker in an exposure is only borrowed; the natural tile has a right to its place, and the exchange rewards the player holding it.
Common house rules
Some groups allow only one exchange per turn, or require every exchange to be announced (the standard only recommends announcing, and an exchange from your own rack needs no announcement). Some tables let the exchanger take the Joker themselves; the standard advice is never to touch another player’s tiles.

If your table agreed on a house rule before the game, that rule wins.

Under review by instructors

Sources consulted: Mahj Life Rules Wiki, Article 221 (Joker Protocols); Mahj Life Rules Wiki, Article 77 (Joker Exchange When Playing Concealed); Mahj Life Rules Wiki, Article 205 (Wrong Number of Tiles — note on several exchanges in one turn); Tom Sloper, Mah-Jongg FAQ 19 (American rules): “When can I redeem a joker? What's the procedure?”, “Can I redeem more than one joker in a turn?”, “Can I redeem a joker atop my own rack?”, “Do I have to expose when I redeem a joker?”; AMJA, The Complete American Mah Jongg Rulebook: Jokers and Joker Exchange; FAQ on Joker Exchange timing; American Mah Jongg Association, American Mah Jongg Rules Companion: Joker Exchange Rules

Wrong tile

Not with that tile

Standard rule
That exchange is not allowed. The tile you give must be the exact natural tile the Joker represents — same number and suit, or the same wind, dragon, or flower. You cannot put a Joker into an exposure to take a natural tile out, and you cannot call a discard in order to use it for an exchange; discards are only for exposures and Mah Jongg. If a wrong tile is noticed before the exchanger discards, simply undo it and fix it. Once the exchanger has discarded, the wrong tile stays — and the player whose exposure now holds it can be called dead for an incorrect exposure. So if you own the exposure, check the tile before you hand over the Joker.
Why
An exposure must stay a true group of identical tiles; a mismatched tile breaks it, and the owner is responsible for what sits on their rack.
Common house rules
Some tables excuse the exposure owner when the exchanger supplied the wrong tile. The standard puts the responsibility on the owner, so agree in advance if your group handles it differently.

If your table agreed on a house rule before the game, that rule wins.

Under review by instructors

Sources consulted: Mahj Life Rules Wiki, Article 221 (Joker Protocols); Mahj Life Rules Wiki, Article 24 (Reasons to Disqualify Another Player — joker exchange with the wrong tile); Tom Sloper, Mah-Jongg FAQ 19 (American rules): “Can I reverse-redeem?”, “Can I claim a redeemable tile?”, “Somebody redeemed a joker but replaced it with the wrong tile. What's the penalty?”; AMJA, The Complete American Mah Jongg Rulebook: Jokers and Joker Exchange (Exchangee confirms the natural tile)

Not your moment

Not now — only during your own turn

Standard rule
Not now. A Joker exchange is only allowed during your own turn, after you have drawn from the wall or called a discard and completed that exposure, and before you discard. Trying to exchange before your turn starts, after you have discarded, or during the Charleston is out of turn, and another player may call your hand dead for it. Wait for your turn, draw, and then make the exchange.
Why
The exchange is part of a turn: it needs the 14th tile in hand first and the discard afterward, so it cannot float between turns.
Common house rules
Some relaxed tables let a player undo an out-of-turn exchange without penalty if it is caught at once. That is a courtesy, not the standard.

If your table agreed on a house rule before the game, that rule wins.

Under review by instructors

Sources consulted: Mahj Life Rules Wiki, Article 221 (Joker Protocols); Mahj Life Rules Wiki, Article 24 (Reasons to Disqualify Another Player — invalid joker exchange); Tom Sloper, Mah-Jongg FAQ 19 (American rules): “When can I redeem a joker? What's the procedure?” and “How does a turn work?”; AMJA, The Complete American Mah Jongg Rulebook, FAQ: Joker Exchange timing

All rules