# Iishanten — Riichi Mahjong Glossary

> Iishanten means one tile away from tenpai (ready to win). Your hand needs one more useful tile to reach tenpai. A critical stage in hand development.

**Source:** https://www.mahjongmaster.co/learn/riichi/glossary/iishanten/
**Author:** Kenji Tanaka (https://www.mahjongmaster.co/about/kenji-tanaka/)
**Publisher:** Mahjong Master (https://www.mahjongmaster.co)
**Published:** 2026-02-18
**Updated:** 2026-03-10
**Japanese:** 一向聴
**Category:** hand-structure
**Variant:** general

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## Iishanten

**Iishanten** (一向聴, いーしゃんてん) is a hand that is one tile away from **tenpai**, meaning it requires exactly one more useful tile to become ready to win. The term literally translates to "one waiting" and represents a critical stage in hand development where victory is within reach.

## How Iishanten works

In mahjong hand progression, players work through several stages of tile arrangement:

- **Ryanshanten** (two waiting): Two tiles away from tenpai
- **Iishanten** (one waiting): One tile away from tenpai
- **Tenpai** (ready): Waiting for the winning tile
- **Agari** (win): Hand is complete

When your hand reaches iishanten, you have developed your melds, pairs, and sequences to the point where drawing just one specific tile (or sometimes multiple acceptable tiles) will put you into tenpai. This is an important psychological and strategic milestone because your hand has matured significantly.

For example, if you need one more tile to complete a sequence or form a pair, and completing that would leave you with a complete hand structure minus only the winning tile, you are in iishanten.

The number of tiles that can improve your hand from iishanten to tenpai varies. Some hands in iishanten have only a few useful tiles (called "narrow" iishanten), while others have many possible improvement tiles (called "wide" iishanten). A wide iishanten is generally preferable because it increases your probability of drawing an improvement tile before your opponents do.

Iishanten is typically the stage where players begin making more aggressive decisions. Since you're close to being ready, you might start discarding tiles more strategically, focusing on defense against opponents while maintaining your own progress. The risk-reward calculation changes significantly at this point, you're close enough to winning that defensive plays become more calculated.

## Walking through Iishanten

Imagine you have:

- A complete sequence: 2-3-4 of bamboo (melded)
- A complete sequence: 5-6-7 of characters (melded)
- An incomplete sequence: 1-2 of dots
- A pair: 5-5 of bamboo

You currently have three melds and a pair with one incomplete sequence. If you draw a 3 of dots, you complete the 1-2-3 sequence, which puts your hand into tenpai. In this case, you are in iishanten because you need exactly one more tile (a 3 of dots) to reach tenpai.

Once you draw that 3 of dots and complete the sequence, your hand structure is complete except for the winning tile itself. Now you are in tenpai, waiting for a tile that completes one of your melds or forms a winning combination.

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*This content is from [Mahjong Master](https://www.mahjongmaster.co), a free educational reference for riichi (Japanese) and American (NMJL) mahjong. When citing this page, please link to https://www.mahjongmaster.co/learn/riichi/glossary/iishanten/.*