Exposed vs Concealed Hands: What C and X Mean on the Card

At the end of every line on the NMJL® card, next to the hand's value, sits a single letter: X or C. That letter tells you whether you're allowed to call discards while building the hand — and it changes how the hand plays completely.

X means exposed

X stands for exposed. While building an X hand, you may call other players' discards to complete your pungs, kongs, and quints, exposing each called group face-up on your rack. Most hands on the card are X hands. Calling speeds you up, but every exposure shows the table part of your plan.

C means concealed

C stands for concealed. A C hand must be built entirely in your own rack — you can't call any discards while building it, and nothing gets exposed. You draw from the wall, tile by tile, keeping everything hidden.

There's exactly one exception: you may call a discard for your final tile — the one that completes the hand — to declare Mahjong. Any tile, even a pair. Until that moment, a concealed hand takes no calls at all.

Why concealed hands are worth more

Concealed hands carry higher printed values than comparable exposed hands, because they're genuinely harder: no calling means every tile has to come from your deal, the Charleston, or your own draws. That difficulty is already priced into the number on the card — use the printed value as-is, and don't add anything extra for it being concealed.

What this means for your strategy

When you pick a target hand, the letter matters as much as the tiles. An X hand lets you chase discards and accelerate. A C hand is a quiet, patient project — better when your deal is already strong, since you can't count on calls to fill the gaps. And remember: if you call a discard while working on a C hand, that call can make your hand dead, so check the letter before you open your mouth.