What are Pon, Chi and Kan? Mahjong Calls Explained
Pon, chi and kan are the three ways to take a discarded tile and turn it into a meld. Each call commits you to a shape and, except for a closed kan, opens your hand.
What does pon mean?
Pon (ポン) is calling a discarded tile to complete a triplet. You can pon if you already have a pair of that tile in your hand. Any of the other three players' discards can be ponned — direction doesn't matter — and pon takes priority over chi when both are called on the same tile.
What does chi mean?
Chi (チー) is calling a discarded tile to complete a sequence. You can only chi from the player on your left (the kamicha), and you need two tiles in your hand that form a valid sequence with the discard — e.g. 2m and 3m to chi a 1m or 4m. Chi loses priority to both pon and ron.
What does kan mean?
Kan (カン) creates a four-tile group. There are three forms: closed kan from four of a kind already in your hand, extended kan upgrading an existing pon to a quad on the fourth tile you draw, and open kan claiming a fourth tile from someone's discard. Every kan flips a new dora indicator and forces you to draw a replacement (rinshan) tile.
How do calls affect my hand?
Any call except a closed kan opens your hand — you lose menzen (closed) status, so riichi, pinfu, menzen tsumo and ippatsu are no longer available. Many other yaku drop by one han when called open: sanshoku, ittsu, chanta, junchan, honitsu, chinitsu. Tanyao, toitoi, yakuhai and honroutou keep their full han open.
When should I avoid calling?
Calls trade flexibility for speed. Avoid calling if you're already close to tenpai with good acceptance, if your only realistic yaku is riichi, or if the board demands defence rather than speed. Call when you need to lock in an open-friendly yaku quickly — yakuhai dragons, toitoi, or shooting for tanyao with a fast value-tile triplet.