Ura dora

Also called: 裏ドラ, underneath dora

Riichi-only: extra dora revealed only if you declared riichi and won.

Ura dora are dora indicators revealed only on a winning riichi hand. After you declare riichi and win, you flip the tile under each currently-revealed dora indicator. Each matching tile in your hand counts as +1 han. Ura dora is one of riichi's biggest payoffs — a lucky ura dora can boost a 2-han hand to mangan or higher.

Related terms

Dora
Riichi bonus tile — each copy in your hand adds 1 han.
Riichi
Japanese-only declaration: bet 1,000 points on a closed tenpai for guaranteed yaku.
Han
Riichi scoring unit — counts each yaku in your hand.