User Guide

Last updated: 2026-07-18

Introduction

This tool helps mahjong enthusiasts improve their tile efficiency judgment through various training modes, progressively mastering core concepts like tenpai, discard decisions, shanten calculation, and yaku recognition.

Why Training?

Tile efficiency is fundamental to mahjong skills. Systematic training helps improve reading speed, optimize discard choices, and enhance actual gameplay performance.

General Settings

Before starting training, you can adjust the following parameters:

Tile Count

Choose between 13-tile or 14-tile modes depending on the training type.

Difficulty Level

From easy to hard, different difficulties affect hand complexity.

Timer

Set time limits for answering to simulate real-game pressure.

Keyboard Shortcuts

1-9Quickly select corresponding numbered tiles

EnterSubmit answer

Daily Challenge

Daily Challenge is the habit loop: everyone gets the same UTC-day set (5 tenpai + 5 discard). Play anonymously; sign in to join the day leaderboard and credit your training streak. Full rules: Daily Challenge.

Play today’s challenge

5 tenpai + 5 discard — compare correct answers and time worldwide.Open Daily Challenge

Tenpai Training

Tenpai training helps you quickly identify ready hands and waiting tiles. This is the foundation of tile efficiency training.

Start Tenpai Training →

Training Steps

System randomly generates a 13-tile ready hand
Observe the hand and identify waiting tiles
Click or use keyboard shortcuts to select waiting tiles
Submit answer to view results

Example Hands

Example 1: Two-sided Wait

This hand is waiting for 4p or 7p. This is a typical two-sided wait.Breakdown: m123, m456, m789 (3 sequences), s88 (pair), p56 (taatsu)

Example 2: Single Wait

This hand is waiting for 9p. This is a single wait.Breakdown: m111, m222, m333 (3 triplets), p123 (sequence), p9 (single tile)

Example 3: Three-sided Wait

This hand is waiting for 1m, 4m, or 7m. This is a three-sided wait.Breakdown: m234 (sequence) + m56 (taatsu, waits 4, 7), or m23 (taatsu, waits 1, 4) + m456 (sequence); p123, s123 (2 sequences), p99 (pair)

💡 Training Tips

Start with easy difficulty to familiarize yourself with common ready hand patterns
Learn to distinguish between two-sided, single, and multi-sided waits
Gradually increase difficulty to challenge complex hands
Practice improves recognition speed for better in-game decisions

Heqie Training

Heqie training helps you learn optimal discard selection with 14 tiles. This is one of the most commonly used skills in actual gameplay.

Start Heqie Training →

Training Steps

System generates 14 tiles
Analyze the hand to find the best discard
Select the tile to discard
View correct answer and explanation

Example Hands

Example 1: Discard Isolated Tile

Discard 1s because it's isolated and doesn't help the hand structure.After discarding 1s, the hand maintains one-shanten status with maximum efficiency.

Example 2: Discard Edge Tile

Discard 1s because it's an isolated edge tile unrelated to the hand structure. After discarding, wait for 1m, 4m, or 7m (11 tiles).Breakdown: m234, p456, s789 (3 sequences), m99 (pair), m56 (two-sided taatsu), s1 (isolated edge tile). Discarding 1s keeps the two-sided taatsu m56 for maximum wait width.

Example 3: Discard Extra Pair

Discard 5m, breaking up the m55 pair while keeping p99 as the pair head. This creates a wait for 3m and 6m (7 tiles, two-sided wait).Breakdown: m1234 (4 consecutive tiles), p456, s789 (2 sequences), m55, p99 (2 pairs). If discarding 1m or 4m instead, you can only wait on shanpon for 5m and 9p (4 tiles), which is less efficient.

💡 Training Tips

Focus on which tile is least beneficial for future draws, prioritize discarding isolated and edge tiles
Analyze shanten changes after discard, choose the option that minimizes shanten
Keep taatsu that can form multi-sided waits
In actual gameplay, also consider safe tiles and reading opponents

One Shanten Training

One shanten training helps you identify hands one step away from tenpai and find all effective tiles that can make the hand ready.

Start One Shanten Training →

Training Steps

Observe 13 tiles
Identify effective tiles (tiles that can make the hand ready)
Select all effective tiles
Submit answer

Example Hands

Example 1: Missing One Taatsu

This hand is one shanten. Effective tiles include: 1m, 2m, 3m, 4m, 5m, 6m, 7m, 8m, 9m.Hand has: m223, m345, m567, m999 (3 sequences + 1 triplet), missing one taatsu or pair.

Example 2: Missing Pair

This hand is one shanten. Effective tiles are all tiles that can form a pair.Hand has: m123, m456, m789, p12, s12 (3 sequences + 2 taatsu), missing one pair.

Example 3: Complex One Shanten

This hand is one shanten. Effective tiles include 1p, 3p, 2s, etc. (completing sequences or taatsu).Hand has: m123, m456, m789 (3 sequences), p12 and s13 (two taatsu), missing one meld.

💡 Training Tips

First analyze what taatsu or pair is missing, then deduce effective tiles
Don't miss any possible effective tiles
Practice improves recognition speed and accuracy
Understanding effective tiles helps make better decisions in actual gameplay

Shanten Calculation

Practice quickly calculating shanten numbers. Shanten is an important indicator of hand quality - lower shanten means closer to winning.

Start Shanten Training →

Training Steps

Observe the hand
Calculate how many steps away from tenpai
Enter the shanten number
View answer

Example Hands

Example 1: 2 Shanten

This hand has 2 shanten.Hand structure: Has some taatsu, but needs 2 effective draws to reach tenpai.

Example 2: 1 Shanten

This hand has 1 shanten.Hand structure: Has m123, m456, m789 (3 sequences), p12 and s12 (two taatsu), one meld away from tenpai.

Example 3: 0 Shanten (Tenpai)

This hand has 0 shanten, already in tenpai.Hand structure: Has m123, m456, m789 (3 sequences), s88 (pair), p56 (taatsu).

Example 4: 3 Shanten

This hand has 3 shanten.Hand structure: Tiles are scattered, needs many draws to reach tenpai.

💡 Training Tips

Remember standard winning form needs 4 sets + 1 pair, add one shanten for each missing taatsu
Quickly identify existing taatsu, triplets, and pairs in the hand
Calculate how many effective draws are needed to reach tenpai
Practice improves calculation speed and accuracy

One Shanten Discard Training

In one shanten state, choose optimal discard to retain maximum effective tiles. This is advanced tile efficiency training.

Start One Shanten Discard Training →

Training Steps

Confirm hand is in one shanten
Analyze effective tile count after discarding each tile
Choose the discard option with most effective tiles
Submit answer

Example Hands

Example 1: Retain Most Effective Tiles

Discard 1p to retain the most effective tiles.After discarding 1p, hand retains more taatsu with maximum effective tiles.

Example 2: Avoid Breaking Multi-sided Wait

Choose discard option that can form multi-sided waits.Keep taatsu that can form multi-sided waits, avoid discarding key tiles.

Example 3: Balance Effective Tiles and Wait Width

Balance effective tile count and wait width after tenpai.Consider not only effective tile count but also waiting tile count after tenpai.

💡 Training Tips

Focus on taatsu efficiency and hand flexibility, avoid breaking multi-sided wait possibilities
Calculate effective tile count for each discard option, choose the one with most
Consider wait width after tenpai, prioritize multi-sided waits
Keep taatsu that can form good shapes

Yaku Recognition Training

Yaku recognition training helps you select every hand-inherent yaku on a completed winning hand. Use it to build fast yaku reading and han counting (situational yaku and menzen tsumo are out of scope for this drill).

Start Yaku Recognition Training →

Training Steps

Study the winning hand (melds may appear; the winning tile is highlighted)
Check every yaku that applies from the candidate list
Submit to see the correct set and a short explanation
Switch among Simple / Medium / Hard and practice or timed mode

💡 Training Tips

Decide closed vs open first, then drop yaku that require a closed hand
Scan common 1-han yaku before compounds; do not miss yakuhai or seat/round winds
Your selection must match the correct set exactly—extra or missing yaku counts as wrong
Pair this drill with the han, fu, and scoring docs for deeper theory

Hand Analysis Tool

Comprehensive analysis tool for any hand configuration. This is the best tool for learning and studying tile efficiency.

Use Hand Analysis Tool →

How to Use

Input or select tiles (supports 13 or 14 tiles)
Click analyze button
View detailed analysis results

Analysis Modes

Normal Analysis (13 tiles)

Analyze shanten, effective tiles, waiting tiles, etc.

Discard Analysis (14 tiles)

Analyze shanten and effective tile changes after discarding each tile to find optimal discard.

Analysis Results Include

Detailed Analysis Content

Shanten Number: How many steps away from tenpai
Effective Tiles: All tile types and counts that can reduce shanten
Recommended Discard: In 14-tile mode, analyze effectiveness of each discard option
Tenpai Information: If in tenpai, show all waiting tiles
Hand Evaluation: Overall hand efficiency and improvement suggestions

Use Cases

Learning & Research

Analyze different hands, understand tile efficiency principles, improve theoretical knowledge.

Game Review

Input hands from actual games, analyze optimal plays, learn from experience.

Training Support

When encountering questions during training, use analysis tool for deeper understanding.

Strategy Optimization

Compare different discard options to find optimal strategy.