Calling, Exposing, and Melds: How a Mahjong Hand Goes Public
A concealed hand is private. The moment you call a discard for an exposure, part of that hand leaves your rack and sits face-up where every player can read it. That shift is the core of American Mahjong pace: calling, exposing, and building melds are one chain of moves, not three separate skills.
This guide walks that chain in table order. You will see what a call is, what exposure requires, how melds are named by size, and what those face-up tiles tell the rest of the table. For the wider rules frame, start at the American Mahjong hub and the how to play guide.
What calling means in American Mahjong
Calling is the claim you make on another player’s discard so you can complete a group in your hand. You speak up between the discard and the moment the next player racks or discards the tile they drew, exchanges a joker, or declares Mah Jongg. The claimed tile comes off the discard table and into a meld you then expose.
A call is not a draw. You do not take the tile into your concealed rack and keep going in silence. You name the claim, take the discard, and put the finished group face-up. The turn structure changes at that moment: the call replaces the draw; you still discard.
You call for a group that the discarded tile completes. In American Mahjong that group is a pung, a kong, a quint, a sextet, or, on a winning turn, the final tile that closes the hand. You do not call for a single loose tile with no group behind it. The discard has to finish something you already hold.
Name the claim clearly. No set word is required: any words that tell the table you want that tile will do. Hesitation is where beginners lose the tile: if the next player has already racked the tile they drew, the discard is gone.
When two players call the same discard for the same purpose, the one next in turn after the discarder gets it. Once a player has exposed, a later exposure call is too late, even from a player nearer the discarder. Anyone calling Mah Jongg outranks anyone calling for an exposure, no matter where they sit. Know that order before the first contested discard, so you do not freeze while two seats both reach for the tile. Speak the claim in one short phrase, then expose without rearranging your remaining concealed tiles in the same motion.
Exposure rules at the table
Exposure is the act of placing the completed group face-up on your rack’s public side. The claimed discard and the matching tiles from your hand go out together. After your discard, the group stays up for the rest of the hand, though a joker can leave by exchange.
You expose only what the call produced. You do not flip unrelated tiles for convenience. Until you exchange a joker or discard, you can add a matching tile or joker, or take one back. You do not slide it back under the rack later. The table has already seen the tiles, and the hand is scored and defended from that information.
Timing is strict. You call between the discard and the moment the next player racks the picked tile, discards, exchanges a joker, or declares Mah Jongg on that pick. You expose as part of resolving that call, not on a later turn. If you called for a kong, the exposure steps that follow belong to that same claim. Keep the sequence clean so nobody has to ask whether the group is live.
After a kong exposure, the called discard is your fourteenth tile, so you discard one tile and the turn ends. Nobody draws an extra tile after a kong. Set the four tiles out first, then discard if the hand continues.
Jokers follow the same exposure logic as natural tiles when they sit inside a legal group. A joker in an exposed pung is visible like any other tile in that pung. For the limits on where jokers can land, see jokers in American Mahjong.
Melds: pungs, kongs, and quints
A meld is a set of matching tiles that counts as one group toward your line. In American Mahjong the common exposed melds are named by count:
| Meld | Tile count | What it is |
|---|---|---|
| Pung | 3 | Three identical tiles |
| Kong | 4 | Four identical tiles |
| Quint | 5 | Five identical tiles; at least one is a joker unless the tile is a flower. |
A pung is the base three-of-a-kind group. When you hold two matching tiles and a third is discarded, you may call and expose the pung. A kong is four. A quint is five and appears only where the card’s notation allows a five-tile group.
A pair is never exposed. A pair stays concealed unless the hand ends on terms that put it in view through the win itself. Singles never expose on their own.
Concealed groups still count toward your line, but they give the table no information until you win or until you choose to expose through a later call. That is the trade: privacy now, or a finished public group that locks part of the hand in place. Choose exposure when the group still matches the line you are building, not only because the discard matched two tiles in your rack.
Example pattern (invented, not from a real card, and impossible because it uses eleven tiles rather than fourteen): three matching 2 Bams, four matching 5 Craks, and four matching Soaps written as a single line. That shape is here only to show how pung and kong sizes sit next to each other in notation. It is not a hand you can declare.
Read groups left to right on your card the same way: by tile type and by the number of copies the line demands. The how to read the card guide covers that notation system without reproducing league hands.
What exposures tell the table
Every exposed meld is a signal. Opponents read your groups to narrow which lines you could still be on and which discards are safe.
A pung of 8 Dots tells the table you needed eights of that suit in threes. Safe discards for everyone else shift once that group is public, because tiles that only served rival lines become easier to throw. Read your own exposures the same way the other seats will: each face-up group removes some lines and leaves others open.
Beginners often call the first legal pung they see. The cost is a public rack that no longer matches the line they later want. Before you call, ask whether the group on offer still fits the line you committed to after the Charleston. If it does not, pass and keep the hand concealed.
Practice naming groups under time pressure. Fluency at the table is recognizing a pung or kong in your rack fast enough to call before the next player racks the tile they drew, discards, exchanges a joker, or wins on the pick. The practice path is built for that repetition inside the Stoa Games app, without needing a full four-player setup every session.
Frequently asked questions
Calling, exposure, and melds are how private tiles become shared information. Make the claim, show only what the claim earned, and read every face-up group at the table, including your own. From there, return to the American Mahjong hub for the adjoining guides on tiles, card reading, and beginner mistakes when you want the next piece in order.