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When Can You Call a Discard in American Mahjong?

· 5 min read

You can call the most recently discarded tile when it completes a group of three or more identical tiles. A pung, a kong, a quint, or a sextet. You can never call one for a single or a pair, unless that tile happens to finish your entire hand.

That's the rule in one breath. The rest of this is the timing, the wording, and the small print that catches everybody in month one.

How long do you have to call it?

Less time than you'd like, and more than you think.

The window opens the moment the tile is named out loud or touches the middle of the table, whichever comes first. It closes when the player to the discarder's right takes her turn. She picks a tile and racks it, or picks and immediately discards, or declares mahjong, or starts a joker exchange. Any of those, and the tile is gone for good.

Two useful details live inside that. Tapping the rack with a tile doesn't close the window. And if she's already picked a tile but hasn't done anything with it yet, you can still call. Her picked tile goes back into the wall in the exact spot it came from, even if she's seen it.

So when you feel that flicker of "wait, do I want that?", you have a beat. Use it. Say "wait" or "hold" out loud and the game pauses for you. It doesn't reserve the tile and it doesn't commit you to anything. It buys you the three seconds your brain needs.

Everyone at that table has needed those three seconds.

What can you actually call for?

Three or more of the same tile. That's the whole test.

Jokers can fill in. If you're calling a 5 crak to make a pung, your exposure can be three 5 craks, or two 5 craks and a joker, or one 5 crak and two jokers. The full joker rules get more specific, but that's the shape of it.

What you can't call for is a single or a pair. Not ever, unless it's the tile that wins you the hand. Year hands and NEWS are the sneaky version of this, because they sit together on the card and look like a group. They're four separate single tiles. Off limits.

You also can't call a discarded joker. A joker that hits the table is simply gone.

And if you're playing a concealed hand, calling is off the table entirely, right up until the tile you want is the one that finishes you.

What do you say when you call?

Say "call." Or "take." Or "I want that." Loud enough that all three of them hear it.

Then, in this order:

  1. Say it out loud.
  2. Pick the tile up and look at it. Actually look.
  3. Place it on top of your rack.
  4. Add tiles from your hand to complete the group.
  5. Discard.

Step two matters more than it sounds like it should. If the discarder named her tile wrong and you build an exposure on it that doesn't work, it's your hand that goes dead, not hers. That's a rough rule for something that wasn't your error, and it's the single best argument for taking one extra second to look at what you just claimed.

Can you change an exposure after you call?

Yes, briefly.

You can adjust what you've laid down, a pung into a kong for instance, right up until you discard or start a joker exchange. After that it's locked for the rest of the game, and the tile you claimed has to stay in it.

That short window is genuinely useful, and most beginners waste it. Lay the tiles down, look at the shape sitting on your rack, and if you want it different, change it before you let go of your discard.

What if two people call the same tile?

More common than you'd guess, and never a fight.

Preference goes to whoever is next in turn, which means the player to the discarder's right. The exception is if the other player has already started laying tiles down for that specific claim, in which case she has it. If you've somehow both started exposing, the League doesn't have a rule covering it, so most tables give it back to whoever was next in turn and carry on.

One thing beats all of it. A mahjong claim takes precedence over an exposure claim, always, even if the other player already has tiles on her rack.

Should you call, though?

Different question, and the more interesting one.

Early in a hand, usually not. An exposure tells the table what you're building and it commits you to it. Most strong players hold off until they have roughly seven or eight tiles going toward a hand. Before that you're announcing your plan in exchange for very little.

Exposing jokers early is the expensive version of the same mistake. That joker is now face up, and any player holding the real tile underneath it can trade for it on her turn. She'll do it, and you'd do the same, and next week you will.

By the middle of the game, call what you need. Waiting forever is its own way of losing.

Quick reference

The first one is the hard one

The first few times you call a tile, your hands will shake slightly and you'll say it too quietly and somebody will kindly ask you to repeat it.

Then one Thursday you'll hear a 6 dot hit the table and you'll have said "call" before you finished deciding to, and it will feel like something you've always known how to do.

If you'd rather get the timing into your hands before you try it in front of anybody, that's most of what Sharp Sparrow is for. Call badly. Call constantly. Nobody's keeping score.