一人何切る道場 by UFAS.inc

How many turns will it take to reach a ready hand (tenpai) from your initial 13 tiles?

"The Solo Discard Dojo" is a mahjong practice app designed for practicing tile efficiency by playing alone.

Focus solely on your initial hand, draws, and discards, and immediately check whether your discard after each turn was truly the right choice.

■ Flow of a Game
1. Start with 13 tiles dealt + 14 tiles drawn on the first turn.
2. Tap the tile you want to discard.
3. Immediately check your answer: The number of tiles your discard can accept and a comparison with the best possible discard will be displayed.
4. Repeat the same procedure until you reach 0 shanten (ready hand), at which point the game ends.
5. Game ends after a maximum of 18 turns.

■ Evaluation Engine Specialized for Tile Efficiency
- Evaluation based on the smaller of the two shanten hands (combined with Tenhou's tile logic calculation)
- The number of tiles that can accept is accurately calculated using the remaining tiles not yet discarded.
- For candidates with the same number of tiles that can accept immediately, the total number of tiles that can accept up to two moves ahead is normalized to a maximum of 100 points. "N" score is used for ranking.
- For 1-shanten, the calculation deepens to 2 moves ahead; for 2-shanten, it deepens to 3 moves ahead, with calculations performed asynchronously (the user experience remains the same).
- After each discard, "Best," "Same Number," and "Your" badges provide instant judgment.
- Even if a discard returns the shanten state, if it maintains the direction of a seven pairs hand, it is noted as "Shanten returned (seven pairs)."

■ Problems are geared towards tile efficiency.
The initial 13 tiles are distributed into 2:10% / 3:60% / 4:30% shanten states.
By focusing on 3-shanten hands, you can repeatedly practice judging the typical "one step away from tenpai" situation.
Red 5s (0m/0p/0s) are displayed one per color, reflecting only their display and score attributes; they do not affect the shanten calculation.

■ Your practice progress is recorded
- Total number of games played / Tenpai rate / Shortest turn to Tenpai / Total best rate / Personal best best rate
- Trend of best rate over the last 12 games
- Notification of new record badges when shortest record or personal best is broken at the end of the game
- Review of the quality of each of the 18 turns's plays (best/better hand/needs review) using colored bands
All data is saved locally on your device. No account registration or login required, and no internet connection is needed.

■ Designed for Solo Play
- Haptics and shrink animation react instantly to taps (eliminating tap detection delay)
- Permanently displays "Home" on the top left and "?" rule explanation on the top right
- Tap each candidate on the tile analysis panel to display a dropdown menu showing acceptance breakdowns
- Automatic advance: 0.9 seconds for correct answer, 3.2 seconds for review; tap the screen to fast-forward
- Automatic advance is paused while reading details
- Legend card on the initial screen says "Answers appear here" to prevent confusion on first use

■ Target Audience
- Intermediate to advanced players who want to refine their tile efficiency
- Beginner to intermediate players who want to internalize the difference between "broad and narrow hands"
- Those who want to quickly practice mahjong techniques during commutes or breaks
- No gambling elements whatsoever

■ Specifications
- Tile types: 34 types of number tiles (1-9 of Man, Pin, and Sou). Includes red 5. Honor tiles and Kokushi Musou are not included.

* Calling: None (Only closed hands, solo mahjong)
* Data: Local storage on device only, no data collection
* Development & Operation: UFAS Co., Ltd. (UFAS.inc)
* ©UFAS.inc