Definition
An exposure is a completed set laid face up on top of your rack after calling a discard, visible to every player for the rest of the hand.
Exposures are information. An exposed set can only go into a line that contains it, and every opponent can see that. They also make any joker inside them available for exchange.
At the table
Every exposure is public information, and that runs both ways. Each exposure on a rack rules out every line that cannot hold it, which is how defence begins. The mistake is exposing a set that still fits several lines you have not chosen between, because you pay the full information cost while keeping none of the commitment benefit.
Also called exposed set.
Read the full guide: Calling and Exposing in American Mahjong: When, How, and When Not To.
Lesson 7, The Play: Calling & Exposures, is the lesson on this. It comes with the Club. See what Lesson 7 covers.
See it on real tiles. The AI coach reads a dealt hand, free, and names the direction it goes for, what to keep and what to pass, at the free read.
Want the coach on call? The Club adds the coach for your own tiles and for each morning’s hand, all 10 lessons, and every new NMJL card taught the week it lands, for $14.99 a month, cancel anytime. See what the Club includes.
Related: Calling, Meld, Racking, Discard. All 52 terms.