# Penchan — Riichi Mahjong Glossary

> An edge wait in mahjong where you need either a 3 with 12, or a 7 with 89. With only 4 tiles available, penchan is considered a weak wait.

**Source:** https://www.mahjongmaster.co/learn/riichi/glossary/penchan/
**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:** 辺張
**Category:** hand-structure
**Variant:** general

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## Penchan

**Penchan** (辺張) is an edge wait in mahjong where you are waiting for the one tile that completes a sequence at the edge of the number range. Specifically, you wait for either a 3 when holding 1-2, or a 7 when holding 8-9. With only four copies of each tile in the deck, penchan is considered one of the weakest wait types in mahjong.

## How Penchan works

In mahjong hand development, players build towards winning combinations while managing their wait pattern. A penchan wait occurs when your hand contains two consecutive tiles at the edge of the number range, and you need the tile immediately beyond them to form a sequence.

### The Two Penchan Scenarios

**Low-end penchan:** Holding tiles 1 and 2, waiting for 3 to complete the sequence 1-2-3.

**High-end penchan:** Holding tiles 8 and 9, waiting for 7 to complete the sequence 7-8-9.

These are functionally identical in terms of tile availability and winning probability, both have only four winning tiles in the entire deck.

### Why Penchan Is Weak

Penchan is classified as a weak wait because:

- **Limited tile availability:** Only 4 copies of the needed tile exist in a standard 136-tile deck
- **Visibility:** Your discarded tiles often reveal to opponents which penchan you're waiting for, making it easier for them to avoid discarding your winning tile
- **Difficult to transition:** Compared to stronger waits like ryanmen (which offer 8 possible winning tiles), penchan requires specific tiles that are harder to draw

When players have a choice, they typically avoid penchan waits and work toward ryanmen or kanchan patterns instead.

### Penchan in Hand Development

Players encounter penchan in several contexts:

**Early game:** When building initial melds, penchan often appears as a byproduct of tile distribution. Skilled players may choose to break up penchan patterns early rather than commit to them.

**Mid-game transitions:** A penchan can become your best option if better waits aren't available. Sometimes accepting a penchan wait is strategically sound if it creates multiple winning paths.

**Late-game situations:** In defensive play, recognizing opponent penchan waits helps you identify which tiles are safer to discard.

## Penchan at the table

Consider this hand situation:

You hold: 1-2 of bamboo (waiting for 3 bamboo), 4-5-6 of characters, 7-8-9 of dots, 2-3-4 of dots, and a pair of honor tiles.

Your penchan wait (1-2 bamboo for 3) is your only incomplete meld. While you have four copies of the 3 bamboo in the deck, this wait is weaker than if you held 2-3 bamboo (ryanmen), which would give you eight possible winning tiles (any 1 or 4 of bamboo). 

If all four 3-bamboo tiles are already visible on the table, your penchan wait becomes impossible to win, whereas a ryanmen wait would still have other options.

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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/penchan/.*