Calls and What They Do (Naki / 鳴き)
5.1 What Is a Call?
A call (鳴き, naki) occurs when you claim a tile that another player has just discarded, using it to immediately complete a group (mentsu) which is then placed face-up on the table. Calling "opens" your hand—once you have any open meld, your hand is open (副露, fuuro), which has significant strategic consequences. The three types of calls are chi (チー), pon (ポン), and kan (カン, specifically daiminkan when calling a discarded tile).
5.2 Chi (チー) — Sequence Call
Chi allows you to claim a discarded tile to complete a sequence (shuntsu). You may only call chi from the player directly to your left (kamicha, 上家)—that is, the player whose turn immediately precedes yours. You take the discarded tile and combine it with two tiles from your hand to form a sequence, which is placed face-up. You then discard a tile as usual.
Chi example: You hold 4s and 5s. The player to your left discards 3s. You may call "chi" to claim the 3s and form the sequence [3s-4s-5s], placed face-up. You then discard one tile from your hand.
Key chi restrictions: (1) Only from the player to your left. (2) Only for sequences—you cannot chi to complete a triplet. (3) Chi is overridden by pon or kan from any other player, and by ron from anyone.
5.3 Pon (ポン) — Triplet Call
Pon allows you to claim a discarded tile to complete a triplet (koutsu). Unlike chi, pon can be called against any player's discard—not just the player to your left. You take the discarded tile and combine it with two identical tiles from your hand, placing the triplet face-up. You then discard. After a pon, play resumes from the player to the caller's right (counter-clockwise from the caller), which means some players' turns may be skipped.
5.4 Daiminkan (大明槓) — Open Kan Call
If you hold three identical tiles and another player discards the fourth, you may call daiminkan (大明槓, "big open kan") to form an open quad. This is functionally similar to pon but creates a four-tile group. After declaring daiminkan, you draw a replacement tile from the dead wall (rinshan tsumo), a new dora indicator is revealed, and you then discard. Daiminkan is covered in detail in Module 26.
5.5 Call Priority
When multiple players want to act on the same discard, a priority system applies:
| Priority | Action | Who Can Call |
|---|---|---|
| 1 (highest) | Ron (win) | Any player |
| 2 | Pon or Kan | Any player |
| 3 (lowest) | Chi | Only the next player in turn order |
Double/Triple Ron: When two or more players can declare ron on the same discard, rulesets differ. Under atama-hane (頭ハネ, "head bump"), only the player closest to the discarder in turn order wins. Under double ron rules (ダブロン), both (or all three) players win simultaneously. Most online platforms use double ron; some tournament rulesets use atama-hane. This can dramatically affect strategy.
5.6 Strategic Cost of Calling
Opening your hand through calls has significant costs that must be weighed carefully:
Yaku restrictions: Several valuable yaku require a closed hand (門前, menzen). Most importantly, you cannot declare riichi with an open hand, which means you lose access to riichi (1 han), ippatsu (1 han), menzen tsumo (1 han), ura dora, and double riichi (2 han). Many other yaku also lose value or become impossible when open (pinfu becomes impossible, iipeiko becomes impossible, etc.).
Defense information leakage: Open melds are visible to all opponents, revealing information about your hand composition and probable waits. This makes it easier for opponents to defend against you.
Hand flexibility loss: Once tiles are locked into an open meld, they cannot be rearranged. A closed hand can be reorganized as new draws arrive; an open hand has frozen groups that constrain your options.
Score reduction: Beyond losing yaku, some yaku have reduced han values when open (honitsu drops from 3 to 2, chinitsu drops from 6 to 5, etc.).
When calls ARE justified: Despite the costs, calling is correct in many situations: (1) To speed up a hand that already has guaranteed yaku (e.g., yakuhai triplet). (2) To complete an expensive hand like honitsu or toitoi where the open penalty is acceptable. (3) When you need a quick win for tactical reasons (denying an opponent's renchan, reaching tenpai for draw payments, or securing a placement in the endgame). (4) When your hand is too far from tenpai to reach it closed in time. The key principle is that calling trades value for speed—and speed is sometimes more important than value.
5.7 Common Beginner Mistakes with Calls
Calling away your only yaku: Opening your hand eliminates riichi as a yaku source. If riichi was your only path to yaku, calling leaves you with a complete but unwinnable hand. Always verify that your open hand will still have at least one yaku.
Over-calling: Calling every available tile because it "completes a group" is a common beginner habit. Each call should be a deliberate strategic decision, not an automatic response.
Ignoring defense implications: Open hands broadcast information. If you pon two sets of honor tiles, opponents know you likely have a yakuhai-based hand and can adjust their defense. Consider what your calls reveal.
QUIZ — Question 5.1
You hold: 3m 4m 7p 7p 7p 2s 3s 4s 6s 7s 8s 1z 1z. The player across from you discards 7p. Can you call this tile?
Answer: D. You already hold three 7p tiles. You cannot pon (that would require holding two and claiming the third). Since you hold three and the fourth was discarded by any player, you can call daiminkan to form a quad. However, this is always optional—you may choose to ignore the discard. Note: three of a kind is not a "sequence" (chi is wrong here), and calling daiminkan is not the same as pon.
5.8 Calling in Practice — A Beginner Game Scenario
Consider a beginner holding this hand in East 2:
This hand is approximately 3-shanten. The player holds a pair of haku (5z). On turn 4, an opponent discards 5z. Should the beginner call pon?
For pon: Forming a haku triplet gives guaranteed yakuhai (1 han). The remaining hand has decent shape with ryanmen partials. Calling drops shanten significantly. Against pon: Opening eliminates riichi, ippatsu, menzen tsumo, and ura dora. But at 3-shanten, reaching tenpai closed is uncertain.
Most Japanese instructors would recommend the pon here. The general heuristic from Hirasawa Genki's (平澤元気) instructional series: the further from tenpai you are, the more justified calling becomes, provided you maintain yaku.
5.9 The Cost of Opening — Quantified
Analysis of Tenhou game data suggests the average value of a closed tenpai hand is approximately 1.5-2× an equivalent open hand, primarily because of riichi + ura dora + ippatsu. However, the average win rate of open hands is higher (faster tenpai), partially offsetting the value loss. The practical conclusion, as articulated in Hirasawa's 『令和版 についての麻雀 負けない打ち方』series, is that calling is justified when: (1) it provides yaku the closed hand might lack, (2) it effectively reduces shanten by 2+ steps, (3) game situation demands speed, or (4) the hand already has high value through dora.
Source notes: Call mechanics are standardized across all major Japanese riichi mahjong rulesets. Priority ordering (ron > pon/kan > chi) is universal. Hirasawa Genki (平澤元気), a Saikyousen-affiliated professional player, produces instructional content covering calling strategy. Statistical analysis of call impact on hand value draws from community analysis of Tenhou ranked game data. The strategic framework for open vs closed hand evaluation is consistent with the analytical approach established in 『科学する麻雀』 by Totsugeki Touhoku (とつげき東北).