Pon
By Kenji Tanaka · Updated
Definition
Pon claims any player's discard to turn your pair into an open triplet, interrupting the turn order to do it. It is the fastest tool in the game and the easiest to misuse, since it opens your hand and kills riichi. Sound pon calls come with a purpose attached: a yakuhai tile, a toitoi plan, or a tanyao hand racing for a cheap finish.
Pon
Pon is a fundamental mahjong call that allows a player to claim another player’s discard to complete a triplet (three identical tiles). Unlike chi, which can only be called from the player on your left, pon can be called from any player, making it one of the most frequently used melds in mahjong.
How Pon plays out at the table
What Pon Accomplishes
When you call pon, you are claiming a tile that another player has just discarded. Combined with two identical tiles already in your hand, this discard completes a triplet, a set of three identical tiles. Once you declare pon and claim the tile, you must immediately expose this meld on the table, making it visible to all players.
How Pon Works
To call pon, you must have exactly two identical tiles in your hand when another player discards the third matching tile. The moment a player discards a tile, you have the opportunity to claim it before the next player draws. You announce “pon” and claim the discard, then arrange your triplet face-up on the table in front of you, typically slightly separated from your hand to indicate it is a meld rather than concealed tiles.
The key advantage of pon over chi is its flexibility: you can claim a discard from any player, not just a specific neighbor. However, this comes with an important consequence, calling pon opens your hand, meaning your melds become visible to all players. This transparency can affect your strategic position, as opponents can see what combinations you’re building toward.
Opening Your Hand
When you call pon, your hand transitions from closed to open. This means:
- Your melds must be displayed face-up on the table
- Other players can see what tiles you’re collecting
- You can still win, but your winning hand will be considered open
- In some mahjong variants, open hands have different point values than closed hands
Precedence in Claiming Discards
When a player discards a tile, multiple players might be able to claim it. Pon takes precedence over chi, meaning if one player can pon and another can chi the same discard, the pon call wins and the discard goes to the player who called pon. Two players can never pon the same discard, since only four copies of each tile exist. Proximity to the discarder matters only when multiple players declare ron on the same tile under head-bump (atamahane) rules.
Pon at the table
Imagine you’re holding two 5-character tiles in your concealed hand. The player opposite you discards a 5-character tile. You immediately call “pon!” and claim that discard. You now arrange all three 5-character tiles face-up on the table in front of you as a meld. Your hand is now open, and you continue playing with one fewer tile in your concealed portion, as you’ve melded three tiles.
Later in the hand, if you draw another 5-character tile, you could potentially upgrade this pon to a kan (four-tile set), though specific rules about kans vary by variant.
Related Terms
Chi
チー
Chii claims the discard of the player on your left to complete a sequence, the only call that is position-restricted. It opens your hand, forfeiting riichi, menzen tsumo, and closed fu, so the standing advice is: no chii without a yaku plan, usually tanyao. Because only one seat can feed you, chii chances are scarcer than pon, and every one telegraphs part of your hand.
Kan
槓
A kan is a quad, the only four-tile meld, and it comes in three kinds: ankan (concealed, from your own draws, keeps the hand closed), daiminkan (calling a discard while holding three), and shouminkan (adding the drawn fourth tile to an existing pon). Every kan flips a new dora indicator, grants a replacement draw from the dead wall, and adds fu, with closed kans of terminals or honors adding the most. Every kan is also a small gamble: the fresh dora helps whoever can use it, and a shouminkan can be robbed for chankan.
Triplet
刻子
A triplet (koutsu) is three identical tiles, concealed (ankou) when drawn yourself or open (minkou) when completed by pon. Concealment is worth money: concealed triplets score more fu, and three or four of them make sanankou or the yakuman suuankou. Triplets power toitoi and yakuhai, at the cost of flexibility, since three copies of one tile is a narrower ask than a run.