This hand has a Dora of 7-Man. Before deciding what to discard, the first step is to count the blocks. Broken down, the hand contains two Manzu blocks, one Pinzu block, two Souzu blocks, and one Haku (White Dragon)—a total of six blocks. Since a complete Riichi Mahjong hand requires exactly five blocks (four sets and one pair), six means one too many. An entire block must be dropped.

The completed sets—the Haku triplet and the 2-3-4 Souzu sequence—are clearly worth keeping. That leaves four two-sided wait shapes as candidates for removal: 2-3 Manzu, 7-8 Manzu, 5-6 Pinzu, and 4-5 Souzu. Discarding the 7-8 Manzu would throw away the Dora, so that block stays. 2-3 Manzu and 5-6 Pinzu are equal in both value and tile acceptance, so either one can go. The real question is whether the Souzu should go instead.

Why the Souzu Shape Is Stronger Here

At first glance, these two shapes appear equal. There are small practical differences: the player is already holding one 3-Sou, which slightly reduces the remaining supply of Souzu tiles. And in terms of wait quality without considering the table situation, a 1-4 Man wait is generally easier to win on than a 3-6 Sou wait. Based on those factors alone, discarding 4-5 Souzu would normally be the correct play.

However, in this specific hand, discarding from 2-3 Manzu (or 5-6 Pinzu) is the right answer. The reason is the pair situation. This hand has no pair—and that changes the evaluation entirely. When a hand lacks a pair, connected shapes (known in Japanese as renzoku-kei)—where two or more blocks are linked together—become especially powerful, because they can produce a pair through draws in addition to completing sets.

In the Souzu section, there is a 2-3-4-5 formation. This shape spans tiles 1 through 6. Drawing a 3 or 6 completes a set; drawing a 1, 2, 4, or 5 creates a pair. That is six types of effective tiles. By contrast, the 2-3 Manzu shape can only form a set with 1 or 4, and a pair with 2 or 3—just four types, and the 5-6 Pinzu is no different. The Souzu connected shape has two more types of effective draws, and that advantage is decisive when no pair exists. Counted across the whole hand, discarding from 2-3 Manzu or 5-6 Pinzu leaves 50 tiles that improve the hand, while discarding from 4-5 Souzu leaves 48.

The key rule to remember: when your hand has no pair, connected shapes are strong. Applying that logic to the Souzu 2-3-4-5 formation leads directly to the answer—discard from 2-3 Manzu or 5-6 Pinzu, and keep the Souzu whole.

The Dora in this hand is 2-Sou. The candidates for discard are 5-Man or 6-Pin. Both keep the hand at 1-shanten, one step from Tenpai, so the real question is which discard leaves more tiles that reach Tenpai. The answer is the 6-Pin.

The 2-3-4-4-4-5 Manzu Shape

The key is understanding what the 2-3-4-4-4-5 Manzu formation actually does. If you discard the 5-Man, the Manzu becomes 2-3-4-4-4, which reaches Tenpai only on 1-Man or 4-Man. If you keep all six tiles and discard the 6-Pin instead, the Manzu accepts 1, 3, 4, and 6-Man. Because the 4-4-4 triplet sits in the middle of the group, the six tiles can be split into sets and waits in several different ways, so more draws fit into it.

Counted across the whole hand, discarding the 6-Pin leaves 22 tiles that reach Tenpai (1, 3, 4, and 6-Man, plus 3, 5, and 8-Pin). Discarding the 5-Man leaves only 17 (1 and 4-Man, plus 3, 5, 6, and 8-Pin).

Many players draw a 4-Man in this situation and discard it, thinking it is a redundant tile. In fact the 4-Man is one of the tiles this shape is waiting for. Keeping the 2-3-4-4-4-5 group whole by discarding the 6-Pin is what unlocks that wider acceptance.

The Dora here is 5-Pin. The correct discard is 7-Man—but on the Nani-kiru Channel, many players chose to discard a 5-Sou or 6-Sou instead. The reason is understandable: the hand contains a 7-8-8-8 Manzu shape, which looks like a strong three-way wait on 6, 7, and 9 Man. That instinct is not wrong, but it misses a more important principle.

Triplet With No Pair: A Powerful Combination

This hand has no pair, but it is unusually easy to form one. The 3-4-5-5-6 Souzu shape accepts every Souzu tile from 2 to 7: some draws extend it into a second set, and others pair up one of its tiles.

The 3-4-5-6-7 Pinzu five-tile run is just as flexible and accepts every Pinzu tile from 2 to 8 in the same way. The hand's overall tile acceptance is very wide: after discarding the 7-Man, 42 tiles bring the hand to Tenpai, compared with 28 if you discard a 5-Sou or 6-Sou to keep the 7-8-8-8 Manzu. Discarding from the Souzu to chase the Manzu structure destroys that efficiency.

There is also a value reason to discard 7-Man specifically: if you keep 7-8-8-8 Manzu, 9-Man becomes one of your winning tiles, and winning on it breaks Tanyao (All Simples). Discarding 7-Man keeps every tile in the hand a simple, which protects a reliable Yaku while maintaining the superior structure built around the triplet and connected shapes.