American Mahjong Charleston Pass Helper
The Charleston does not have one automatic answer, but a few rack features can make certain tiles safer to pass than others. This helper asks about the tiles you are considering and returns a ranked decision framework. It does not replace checking the current card.
The helper evaluates structure, not exact legality
Only the current official card can show whether a particular number, suit, wind, dragon, or flower belongs in a candidate hand. Use the result to rank tile usefulness, then verify the actual lines.