Riichi vs calling: the same hand shape, two outcomes

1. Price both outcomes first

Start with the closed hand: 123m 456m 789p 22s 34s, thirteen tiles, waiting on 2s and 5s, eight tiles nominally. Declare riichi and you have riichi + pinfu — 2 han 30 fu, 2,000 points on ron as a non-dealer. Tsumo is 3 han 20 fu: 700 from each other non-dealer and 1,300 from the dealer, 2,700 in total. One dora takes it to 3 han 30 fu, 3,900.

Now open it. Replace the 789p with a called pon of East, the round wind. The hand still has three melds, the 22s pair and the 34s ryanmen, and exactly the same winning tiles, but the only yaku is yakuhai East — 1 han 30 fu, 1,000 on ron, 300 and 500 on tsumo.

Same wait, same winning tiles, half the points. This is not an argument that calling is bad. It is an argument that this hand does not need to call. Calling is worth exactly what it buys, and here it buys nothing.

Put three shapes side by side and the gap widens. Tanyao: closed riichi + tanyao + pinfu is 3 han 30 fu, 3,900; opened it is tanyao alone, 1 han 30 fu, 1,000. Honitsu: closed riichi + honitsu is 4 han 40 fu, 8,000 (mangan); opened it is honitsu 2 han 30 fu, 2,000. The multipliers are 2x, 3.9x and 4x.

Those numbers are not a case against calling. They are an exchange rate: this is what the turn you save is worth.

2. What riichi adds beyond the 1 han

On the card riichi is 1 han. In practice the return is four things stacked.

Ura-dora: only a riichi hand gets ura-dora, and one flipped indicator is another han. This is the most underrated part — it changes nothing about the hand, it just adds a payout that only materialises after you win.

Ippatsu: win within one turn of declaring and take another han. You cannot plan it, but it lifts the expected value of every riichi you declare.

Concealed tsumo: 1 han, and open hands never get it. That is why a closed hand often scores more on tsumo than on ron: the 2 han 30 fu hand above pays 2,000 on ron, but 3 han 20 fu on tsumo for 2,700 in total.

The fourth item is not a han at all: the declaration itself is a threat to the table. Opponents must hold safe tiles for you and slow their own attack. That value never appears on a scoresheet, but it is real. A call also reveals information, yet it produces none of this pressure — everyone knows you can no longer riichi.

3. What riichi costs

Furiten: after declaring, you cannot ron on any tile you discard. You have switched off part of your own winning range, and the opponents can see which part.

Lock-in: after riichi you can only tsumogiri. A hand that could have turned to defence in the middle game now has to push to the end.

Information: the declaration tile plus the tsumogiri sequence afterwards writes your hand range on the table. Reading you stops being guesswork and becomes elimination.

So riichi is not “I am tenpai, therefore I declare”. It is “this hand, I am trading defensive capacity for points”. When you are ahead in placement, someone else has already declared, and your wait is a closed one, the trade usually does not hold.

4. What calling actually buys

First, speed — and speed has to be counted in tiles, not in “one fewer tile”.

Take 234m 567m 345p 6p 8s East East, thirteen tiles, 1-shanten with 13 kinds and 45 tiles of ukeire. The player to your left discards East; you pon, ten tiles stay concealed, and discarding 8s leaves you waiting on 3p and 6p — six tiles nominally.

That one call trades a 45-tile 1-shanten for a 6-tile tenpai. Tenpai is now; the tile count is the price. Whether the trade is good depends on how many turns are left: a 6-tile wait on turn 5 is not obviously faster than a 45-tile 1-shanten on turn 5.

Second, a guaranteed yaku. A closed hand with no pinfu, no tanyao and no value tiles cannot ron at all until it declares riichi. After a yakuhai pon the yaku is locked in — no gamble on the declaration, no furiten risk.

Third, fixed shape. Honitsu, chinitsu, toitoi and san-shoku doukou are all yaku that calling accelerates; you lose a han tier, but the hand no longer depends on drawing the right tiles to take its final form.

5. Which shapes are worth opening

Worth it: (1) a value-tile pair at 1-shanten, where the pon doubles your ukeire and adds a sure yaku; (2) tanyao already formed and you need to win now; (3) honitsu or chinitsu that cannot be finished closed but can be fixed by calling; (4) toitoi and san-shoku doukou, which depend on calls, plus hands with enough dora that speed is the whole point.

Not worth it: (1) a completed pinfu ryanmen — 2,000 becomes 1,000; (2) a closed 1-shanten with 40+ tiles of ukeire, which will reach tenpai on its own within two turns; (3) a table where someone has already declared, because an open hand has no concealed tiles left to fold with; (4) being dealer and ahead, where you need points, not speed.

In one line: calling buys “this hand ends sooner” and sells “this hand is smaller and harder to abandon”. Buy it when you need the first more than you need the second.

6. Hand one: the yakuhai you should call

East 2, you are a non-dealer. On turn 6 you hold 234m 567p 34s 68s East East North, thirteen tiles, 1-shanten, 3 kinds and 12 tiles of ukeire.

This hand is worth very little closed: no tanyao (North is a guest wind, a terminal honour), 68s is a kanchan, and the best it can score is riichi alone for 1 han. In other words the closed route tops out at 1,000 points, and you still have to draw 2s, 5s or 7s to reach tenpai.

The player to your left discards East. You pon, keep ten tiles concealed, discard North, and hold 234m 567p 34s 68s — 1-shanten with 7 kinds and 24 tiles of ukeire. Same shanten, ukeire doubled from 12 to 24, and yakuhai East is already guaranteed.

The points do not change — 1 han 30 fu, 1,000 either way — but the speed doubles and the riichi risk disappears. This call is clearly correct.

7. Hand two: the 45 tiles you should not call

Later in the same game, turn 9. You draw into 234m 567m 345p 6p 8s East East, thirteen tiles, 1-shanten with 13 kinds and 45 tiles of ukeire. Two more draws and this hand is almost certain to be tenpai on its own.

The player across discards East. Pon it and ten tiles stay concealed; discarding 8s leaves 3p and 6p, six tiles nominally, with yakuhai East as the only yaku.

A 45-tile 1-shanten becomes a 6-tile tenpai. Most of the time that is a loss: 45 tiles means close to two thirds of the next draw is useful, while a 6-tile wait needs one of two tile types with three copies each left.

The order of the check is: count the closed ukeire first, count the open wait second, and only then ask whether this hand has to win right now. If the first number is large enough, the answer to the call is usually no.