You win on the dealer's very first discard.
A non-dealer wins on the dealer’s very first discard, before drawing anything. It is a limit hand, and it is the answer to Heavenly Hand for the other three seats. Your thirteen tiles plus that one discard must complete the hand exactly.
Nothing to build. Like Heavenly Hand it is dealt rather than made. The practical lesson is to read your opening hand fully before the dealer’s first discard, so you recognise a one-tile wait when you are holding one.
Missing the claim. The window is a single discard, and it closes at once. If you have not worked out what you are waiting on before the dealer plays, the hand passes.
Nothing adds to it. The win occurs on the first discard of the hand, before any other condition could arise.
Does it count on the second discard?
No. Only the dealer’s first discard qualifies.
Can the dealer score Earthly Hand?
No. The dealer’s version is Heavenly Hand, won on the opening fourteen tiles.
Do I have to be concealed?
Necessarily, since nothing has been claimed yet when it happens.
Play Mahjong Winds
Every win shows its faan line by line, using the table on this page.