Do you riichi?

[Mauro]

http://tenhou.net/0/?log=2015091216gm-0 ... b69ba&tw=1

South 2: in the fifth step I was tenpai, waiting on (three out) and (three out); it wasn't a good wait, I was first with a good lead on third and fourt, so also to not lose the chance to defend I choose not to riichi, and both tiles were discarded; on the other hand, I was East, so chance of renchan. Was it right not to riichi?

(In East 4 I threw away tenpai, dealing in meanwhile; don't know why I missed it, or if I was just wary to discard dora, with none showing and left player potentially dangerous on bams.)

[or2az]

South 2



Since you decided not to riichi due to the bad wait of 2 tiles, one and one , why not change the wait when you drew the on your next turn and especially when that last came out and you drew the again. There were still three left.
At least you would have had a better shot at winning.

You also didn't have a yaku, so after drawing that first early , and if you still decide not to riichi, you may have decided to toss the and have tanyao.
It would move you back from tenpai, but the options of riichi, menzen tsumo, open tanyao, or playing it safe, would still be there for later.

[Mauro]

You're right, I think I was short on time and I didn't noticed it; as for open tanyao, I was playing without it.

[Mauro]

I had an interesting hand: it's quite early in the game and I'm tenpai. If I ron my win it's 12k points, if I tsumo it it's yakuman. Riichi could make a ron worth something more, if I hit ippatsu or ura dora, but it'd let my opponents know I'm tenpai. On the other hand, if someone turns in defense I could improve my tsumo chance, and both my waits are half suji.

(In the end I didn't riichied, and left player won on a ron from front player; of my four outs, one was in left's hand, and the other three somewhere in the wall.)

[Iapetus]

Declaring riichi increases your chances to tsumo. With suuankou it's standard to riichi to maximize your yakuman chances.

[Gnom]

[Mauro]

South 3, I'm in first place with a nice lead; I have just three outs (6-bam), which is half suji.

[Gnom]

Only 3 of your outs left and only yasume so you're looking at a difficult 2000 points (3000 if tsumo) win where you're exposing yourself when you don't need either points or renchan, plus you have a pretty good potential for defense... For me that would be damaten and folding at any sign of danger, aiming at a quick win in S4. That discarded 3-sou won't help you much either.

[Mauro]

I was wondering about suuankou (http://reachmahjong.com/en/forum/viewto ... ffe#p58911): would it be standard to riichi also if I were in tanki wait, with the four pon already in hand?

Edit: I wrote suukantsu, edited with suuankou.

[Referee]

You mean Suuankou. Suukantsu is four kan. Anyway, Suuankou Tanki is double yakuman (if allowed) whether by ron or tsumo, so I'd say damaten in this case.

[Mauro]

Fixed, thanks. What if it weren't a double yakuman (under EMA rules, it isn't; the only double yakuman is the big four winds).

[Mauro]

A couple of situations, with my considerations:

01.jpg (120.41 KiB) Viewed 24343 times

1) I riichied (and lost to toimen), but I was unsure about that, and in retrospect maybe it would have been better not to riichi. If I win it's mangan, but I'm waiting just on dora: two outs, and dora isn't likely to be discarded with someone in riichi. If the weren't in the pond, I think riichi is good.

02.jpg (125.75 KiB) Viewed 24343 times

2) if I don't riichi, I'm first unless I win by ronning from someone beside shimocha, otherwise I win; since toimen is less than 10k behind me, is East (so chance of continuance if he wins) and seems to be after something flushy, I think it's best to stay damaten and avoid risking dealing in toimen.

[Mauro]

I'm first, with a few points on second; kamicha just riichied; I can go with riichi pinfu two dora triple wait, but discarding which isn't safe.

[Krabman]

That's a very interesting push/pull situation. I have a lot to improve in that field myself...Anyway... here are my thoughts:

The hand is really tempting. Great wait. Dora 2 and only one 1s unaccounted for. Oya most likely doesn't have it. But with ippatsu/ura, getting a Mangan here is not hard. 45m ryanmen wait is possible. That 5s also points to a possible wait in Souzu.

We mustn't forget Toimen, who reeealy doesn't want Kamicha's renchan. If his hand is progressing nicely, he might push.

The question is - do you need to win here?

I don't think so. Even if Oya gets tsumo Haneman, you will not be too far behind and there's still your Oya turn to get him back. If you deal in - you might even fall to last place and he will still get renchan. The risk isn't worth taking, in my opinion.

[Mauro]

45m wait is possible. That 5s also points to a possible wait in Souzu

Why that 5s points to a possible souzu wait?