Yaku and dora are different jobs

Ask two separate questions

First: “Is this a legal winning hand?” That means a permitted shape, at least one yaku, and satisfaction of the other winning rules. Second: “How much is that hand worth?” Yaku values, fu and applicable bonuses help determine the score under the chosen rules.

Confusing those questions produces a frustrating beginner experience: the rack looks complete and contains a promising bonus tile, yet no win is available. The missing piece may be a yaku. It may instead be furiten or another restriction, so inspect the actual reason rather than assuming every unavailable win is the same mistake.

Recognize a few yaku without memorizing a catalog

A dragon pair is not a dragon triplet. One terminal tile anywhere prevents all simples. Drawing your own winner after making an open call does not give the closed-self-draw yaku. These distinctions are more useful at first than learning a dozen names without recognizing their requirements.

Read a numbered dora indicator

In standard Riichi, a numbered indicator points to the next number in its own suit. A 4 dots indicator identifies 5 dots as dora. A 9 bamboo indicator wraps around to 1 bamboo, not to a different suit. The indicator is a signpost; it is not itself the bonus tile just because it is visible.

Dora is still an ordinary tile for building sets and pairs. It cannot stand in for a missing tile like a joker. If your 5 dots is dora, it remains 5 dots: it can join 3–4 dots or 4–6 dots, but it cannot impersonate a red dragon.

Compare two complete-looking hands

Consider this specific completed hand: an open 1–2–3 bamboo chow, 4–5–6 dots, 7–8–9 characters, three Easts, and a pair of 5 bamboo. You sit South in a West round and would win by ron on 9 characters. There is no riichi declaration or special winning circumstance. This hand has no qualifying ordinary yaku: it is open, includes terminals and honors, and the East triplet matches neither seat nor round wind. Its mixed sequences do not form a straight or a three-suit matching sequence, and 4–5–6 dots prevents an outside-hand pattern. A dora designation cannot make this specific hand eligible.

Now suppose your open hand includes a red-dragon triplet. That triplet provides a yaku; the rest of the hand must still form a valid structure and satisfy the winning restrictions. In a complete standard Riichi scoring system, applicable dora can then increase the value. Eligibility comes first.

The pair can make or break the plan

Suppose every tile in your four sets is between 2 and 8. If the pair is East–East, the hand is not all simples: honors are excluded everywhere, including the pair. Replacing that pair in the completed example with 8 bamboo–8 bamboo would remove that particular obstacle. It does not mean a player may freely swap tiles during a game; it is a comparison of two finished hand shapes.

A dragon pair has a similar trap. It is useful material toward a possible dragon triplet, but the pair itself does not supply the dragon-triplet yaku. Conversely, a completed red-dragon triplet can supply that yaku even though it prevents all simples. Choose a real qualifying route instead of asking every rack to satisfy the same pattern.

A standard scoring example with the eligibility already settled

Assume a legal winning hand has exactly one one-han yaku, exactly two copies of the tile identified by one active dora indicator, and no other yaku or bonuses. In standard Riichi, that is 1 yaku han + 2 dora han = 3 han before using fu, winning method and dealer status to calculate the payment. The dora did not create the permission to win; the yaku did.

Remove the yaku from the example and the two dora do not rescue the hand. Remove the dora instead and the yaku can still make the complete hand eligible, subject to the other rules. This comparison is about standard scoring; Dragon’s current payment calculation does not include those two dora han.

When the hand looks complete but no win appears

1. Check the shape. Did you accidentally mix suits, use a nonconsecutive sequence or count one tile in two groups?
2. Name the yaku. “I have a dora” is not an answer. Check whether opening the hand removed your only route.
3. Check the entire pattern. A single honor in the pair prevents all simples; a pair of dragons is not a triplet.
4. Check the winning method. Closed self-draw needs your own draw. Furiten can prevent a discard win.
5. Check the practice scope. A tournament pattern missing from this implementation may not be recognized here.

This sequence is more reliable than repeatedly clicking the same tile. If you still cannot explain the result, compare the exact hand and circumstances with the rules of the game you are actually playing.

Value a call by what it preserves

Before exposing a set, name the yaku that survives. Then ask whether the call improves your chance to finish enough to justify the lost flexibility. Some yaku disappear when opened; some remain but change value. A bonus tile is worth considering, but keeping one isolated bonus forever can make a weak hand slower.

Practice comparing two discards with a reason for each. “This one protects my yaku” and “this one preserves more useful draws” are concrete arguments you can test. See choosing a discard for a worked sequence example.

Use the right source for exact scoring

Lightning Dragon’s current point calculation totals its recognized yaku and fu, without adding dora. It does not implement red fives, ura-dora or the complete set of situational yaku. Use this mode to practice common hand-building decisions; use your event’s scoring rules for exact tournament totals. The World Riichi rulebook is a primary reference for its own competition format.