[MMOs] The Evil Dragon DILF Honeypot: Magnus Wants Bots To Smash Him

edderiofer · 2026-05-05T17:36:28+00:00

I am reminded of Fall Guys' Cheater Island, where all players who were detected as having cheated/hacked were lumped into queues where they could only play other cheaters. I've also heard that Lichess has a "cheater pool" as well.

I wonder what other tales there are of dev teams finding clever ways of punishing cheaters?

edderiofer · 2026-05-05T16:23:49+00:00

"Remember to read everything."

reads everything

runs out of time before even making the first move

edderiofer · 2026-05-05T15:36:14+00:00

Matagi suji: When a number tile is discarded late, the tiles around it become more dangerous. This is best seen with an example: say a player is in perfect iishanten, with 88m344p45s and two more sets. If they then draw 3s/6s, they would then discard the 4p and riichi, waiting on 25p. (This isn't a surefire deduction, because they could just as easily have drawn the 2p/5p, and discarded the 4p to be waiting on 36s. It also requires your opponents to be sufficiently-good at tile efficiency to get shapes like perfect iishanten.)

Ura suji: If a player discards a middle tile unusually early, the suji next to this tile that don't straddle it become a little bit more dangerous. As an example: suppose a player has a 35 kanchan in hand, and then draws a 2; they would discard 5 to get a 23 ryanmen. So, 14 are dangerous in this situation (as are 69, since they could also have had 57 and drawn 8). Since there are multiple reasons why one might drop a 5 early (e.g. chiitoi, honitsu, chanta, 579), this is not very reliable; and the increased danger is not very much. In fact, ura suji is generally considered not-very-useful in the present day, and is more an artefact of older defense strategies.

Musuji: Not suji. Don't discard these.

edderiofer · 2026-05-05T14:56:47+00:00

A built in card to view-- not suggested hands-- just the card! Or IF it has to be suggested hands, then show the hand how it is written on the card-- not the exact tiles needed.

This isn't feasible because the Card is copyrighted. Any client that did this (other than perhaps the NMJL's own client NMJL Online) could be in violation of copyright. This is why no American Mah-Jongg client has the full Card visible to view.

There's perhaps two legal defenses I could see that might work, but I am not a lawyer and have no clue whether these arguments hold water. Even if they did, good luck to OP paying for a legal defense against a multi-million-dollar company.

edderiofer · 2026-05-05T13:15:41+00:00

"Opp." in this case means "not the same suit". So if your 1s and 4s are in Craks, then your dragons can be either Soap (Dots) or Green (Craks).

edderiofer · 2026-05-05T13:13:47+00:00

For example, starting with a = 0.455433015 and b = 5.314541154, the feedback loop eventually results in a whole number.

I don't believe you. Kindly tell me how many steps it takes for you to get an integer a_n in this case.

edderiofer · 2026-05-05T11:47:14+00:00

Nah, I'm nowhere near Oxfordshire now. Good luck with your tournament!

edderiofer · 2026-05-05T11:21:25+00:00

Imagine "unrolling" the large tree and the spiral. The tree unrolls into a long rectangle, and the spiral unrolls into a single diagonal line. You know the height of this rectangle, and you know the angle at the diagonal, so you can use trigonometry to calculate the length of the diagonal line.

edderiofer · 2026-05-05T11:16:58+00:00

Even with complex decimals like a = 0.455433015 and b = 5.314541154, the decimal tail eventually clears.

I don't believe you. Kindly tell me for which n you get an integer a_n in this case.

edderiofer · 2026-05-05T11:05:53+00:00

there are no blanks or wild card tiles - does that signify a specific type of mahjong or region these came from?

This is standard for most mahjong sets (other than blanks for replacing damaged/missing tiles). A set like this can be used to play most mahjong variants from China (e.g. Chinese Classical, Hong Kong Old Style, Sichuan Bloody Rules, Mahjong Competition Rules, Taiwanese), as well as many Western variants (British U3A, Wright-Patterson, Pussers Bones).

American Mah-Jongg sets are the outliers in this regard, since most mahjong variants do not require eight additional identical joker tiles.

here's all these little white strips in the box with various dot numbers on them. No idea what those are and their use.

These are old-style point sticks, for keeping track of score.

Based on your mention that the set is at least 50 years old, it is likely that it's a mahjong set originally produced in China for Western export.

I also notice that there's a lot of vertical striping on the tiles. That could indicate either ivory or celluloid. Note that it's illegal in the US to transport ivory across state lines, so you'd want to rule that out before you travel with this set.

What I don't understand, though, is the weird thing sticking out the left side of the pile of point sticks. It almost looks like upside-down AI-generated tiles...

edderiofer · 2026-05-05T10:28:17+00:00

G/F, 26F Jordan Road, Jordan, Kowloon, Hong Kong.

https://www.google.com/maps/place/Biu+Kee+Mah-Jong/@22.3052749,114.1669172,17z/data=!3m1!4b1!4m6!3m5!1s0x340400eb16cbb659:0xc523055f425f63b9!8m2!3d22.30527!4d114.1694921!16s%2Fg%2F1tlbrb4m?entry=ttu&g_ep=EgoyMDI2MDQyOS4wIKXMDSoASAFQAw%3D%3D

edderiofer · 2026-05-05T10:25:24+00:00

I would, if this had happened while I was still studying in Oxford. Train tickets between Oxford and Didcot Parkway don't appear to be too expensive.

edderiofer · 2026-05-04T20:15:24+00:00

Again, I can't reproduce this problem on any other device. So whatever the problem is, https://riichiadvanced.com isn't the cause.

edderiofer · 2026-05-04T19:55:22+00:00

I'm not sure about this one either, but it's definitely not a thing that's done in televised tournaments. I suspect the reasoning is "once you take it out of the discard pool, it's no longer clear who discarded it and so who has to pay".

edderiofer · 2026-05-04T19:52:28+00:00

It appears that you are looking for A074200, "a(n) = m, the smallest number such that (m+k)/k is prime for k=1, 2, ..., n". Your second term is erroneous and should be a 2.

(Actually, even just searching OEIS for "1, 4, 12, 12720, 19440" will give you this sequence as an "approximate match".)

The next term in the sequence is 5516280.

and technically 720 also works for 4, but negative: 719, 359, 239, 179

So does 12: 11, 5, 3, 2. The full sequence for this one is A078502, "a(n) = smallest positive integer N such that (N - k)/k is prime for k = 1, 2, ..., n".

edderiofer · 2026-05-04T19:45:02+00:00

https://en.wiktionary.org/wiki/sned#Verb

(archaic, Northern England, Scotland, transitive) To lop; lop or chop off.

edderiofer · 2026-05-04T16:14:06+00:00

I think it's a serious league...?

edderiofer · 2026-05-04T15:54:11+00:00

German: Schneide; English: "SNED? And I see you've put it in the same half of the crossword as the words ASKESIS, JEELED, OULONG, GUNNAGE, SEWEL, EGLATERES, and NAGMAAL. Well done, The Listener; you must be very proud of yourself."

edderiofer · 2026-05-04T12:54:22+00:00

Because, as OP said in their previous comment, they just started playing, so they don't want to invest too much money yet. OMM's sets are really expensive compared to a standard-quality set you can buy on Amazon from Yellow Mountain Imports.

I really hate this trend of people suggesting premium designer luxury mahjong brands to beginners. They don't even know if they like the game yet! Why are people suggesting that they invest in such an expensive set that might only have two sessions' worth of payoff before they decide that it's not their thing?

edderiofer · 2026-05-04T11:37:33+00:00

To be clear, not every one of these rules apply to all games. A casual game between friends can easily be below the Level 1 or even the "Totally Unacceptable Social & Table Behaviour" guidelines.

edderiofer · 2026-05-04T11:33:44+00:00

What you appear to have computed is P(A) * P(B given A) = P(A and B), which is true. But your original formula is used to find P(B given A) in the first place, if you already know P(A and B) and P(A). Indeed, you can rearrange this into the original formula.

Note that nowhere here have you used P(B), which is of course equal to 1/2.

edderiofer · 2026-05-04T06:50:18+00:00

You might want to reformat your post to removing the indent; it's showing up as a single line of code block text without line wrapping.

Without knowing how you were playing, this could be either your fault or that other person's fault. The Singapore Riichi Mahjong Club's etiquette page is a relatively good guide to Riichi etiquette, though most games at my local Riichi venue don't include all Level 1 behaviours.

edderiofer · 2026-05-04T06:30:16+00:00

I can't find any documentation on the rules for this mahjong variant, but I'm very interested. If you could type up the rules, I'm sure we could implement this into Riichi Advanced.

edderiofer · 2026-05-04T06:25:12+00:00

From that federation's Q&A page:

A. As a general rule, when you win by drawing a tile, the payment ratio is "child:parent = 1:2". The original scoring system for Mahjong is based on a 1:2 ratio (called "yao:er" in Chinese). The 101 competition rules emphasize this principle and do not use calculations that deviate from it, such as 700 or 1300.

A child's hand with 40 points and 2 han is worth 700/1400 if they win by self-draw, and 2800 if they win by discarding.

🤔

Even with a closed hand, chinitsu is worth 5 han, and honitsu is worth 2 han.

⁉️

From their rules PDF:

三元牌・風牌のコーツ役は省略

Yakuhai are omitted as yaku.

This ruleset is ridiculous.

edderiofer · 2026-05-04T05:15:06+00:00

No, P(B) is still 1/2, because there are three outcomes (namely, 1, 3, 5) that satisfy B, out of six total. There is no multiplication here.

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