What Would You Discard? #5667168 (1-shanten)

Which tile do you discard? (maximize acceptance)

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5索・ acceptance 18tiles: 4萬 5萬 7萬 7筒 8筒 9筒

📖 Related reading

Mahjong Glossary: Tenpai, Shanten, Waits, Tile Efficiency, and MoreA beginner-friendly glossary of the riichi mahjong terms that come up most in "what to discard" problems — tenpai, shanten, ukeire, wait shapes, and more. Knowing what they mean makes problems and commentary far easier to follow.