Mahjong Nanikiru (What to Discard) Problems
155 curated tile-efficiency problems — one problem per page
About these problems
"Nanikiru" (何切る, literally "what to discard?") is the standard practice format for Japanese mahjong tile efficiency. You are shown a 14-tile hand and must decide which single tile to discard to maximize your shanten progress and acceptance count.
Note: Individual problem pages are currently in Japanese only. The interactive shanten calculator and tile efficiency tool linked below are fully bilingual and let you verify your reasoning against the same engine that grades these problems.
Difficulty levels
Beginner (15)
Basic tile efficiency: isolated tiles, penchan, kanchan handling
Intermediate (70)
Tile acceptance counts and shape transitions
Advanced (70)
Yaku-aware, scoring-aware, and push-fold judgment combined
Related English tools & articles
- Shanten Calculator — instantly compute the shanten number of any hand
- Tile Efficiency Interactive Tool — analyze acceptance counts for each discard
- How to approach nanikiru problems (article)
- Mahjong Waiting Patterns Guide — ryanmen / kanchan / penchan / tanki essentials