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One-Answer WCA Competition and Regulations Question Thread

Mike Hughey

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This was actually done to prevent problems with premoves / inverse scrambles - to allow people to find premoves without having to worry so much about using part of the scramble in their solutions. Those 3 moves don't count towards using part of the scramble, which gives some breather for finding premoves.

A good discussion of this change appears here:
https://github.com/thewca/tnoodle/issues/210

Adding on R' U' F to the beginning and end doesn't quite accomplish the requirement, as I unfortunately discovered with my first attempt at adding it in the Weekly Competition - the possibility exists that the scramble being added to might cancel one or more of those moves, which would defeat the purpose. So the initial scramble needs to have nothing that cancels or partially cancels an F at the beginning or an R' at the end. But given that, adding R' U' F to the beginning and end does give a valid scramble for FMC.
 
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So the initial scramble needs to have nothing that cancels or partially cancels an F at the beginning or an R' at the end.
There's one important caveat here: you need to start with a random state, then find a solution to that that doesn't start with R* and doesn't end with F*. If you instead generate random states until the scramble sequence satisfies those constraints, this introduces a minor bias to the scrambles. (This is already mentioned in the GH issue, but it's worth highlighting separately; generating random-state scrambles comes with a whole bunch of subtleties that might be missed on first glance.)
 

Mike Hughey

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Yes, that's true - sorry, I should probably have mentioned that. But also remember that it's not just "starts and ends with", it's "cancels". So, for example, a solution to a random state that starts with "B F" still won't work.
 
Why was Magic removed from the WCA? IDK but i have an idea, maybe because it wasnt a cube but then again, Megaminx, Pyraminx, Clock. So idk why but please tell me why!
Because once you solve it once, you know how to solve it every single time. There is no way to scramble it.
 
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Worlds only happens once every 2 years, usually in July. The next one will be in 2019, but no location has been announced yet.
Do you know (or anyone for that matter) know a rough location of where World 2019 will be? I know that it takes a while for the WCA to decide on Worlds, but I am just curious if any new info has been released, especially since these forums is my only way for cubing update's, since I do not have Facebook, Twitter etc.

Edit: I just remembered that there is a thread already created for Worlds 2019, so sorry that I did not post this there, but thank you moderates in advance for moving it.
 

Mike Hughey

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It is still too early to know. Applications for World Championships are now being accepted (through July 15); you can read about it here:
https://www.worldcubeassociation.org/posts/applications-for-world-championship-2019

I would guess that the details of the proposals are probably the most significant factor that they will consider when making the decision, but it would seem to me that, all things being equal, something in Asia might make a lot of sense since it has been a while since Asia has had World Championships (2011 in Thailand).
 
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It is still too early to know. Applications for World Championships are now being accepted (through July 15); you can read about it here:
https://www.worldcubeassociation.org/posts/applications-for-world-championship-2019

I would guess that the details of the proposals are probably the most significant factor that they will consider when making the decision, but it would seem to me that, all things being equal, something in Asia might make a lot of sense since it has been a while since Asia has had World Championships (2011 in Thailand).
Thank you very much for that, much appreciated:) Do you know if the US is thinking about applying? I doubt they are but I thought I would ask. Thanks
 
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The Rainbow Cube and Siamese Cube(s) because there wasn't enough interest in it

The WCA in 2007 said:
  • Art. 9a/d, removed Siamese Cube, Rainbow Cube from the events. Not enough interest from the community for these events. For future versions we have to come to a method of deciding which events should be official.
You could count Multi old Style as removed.
Magic and Master Magic as they are no puzzles.
 
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Do you think the new GTS3M will be legal for BLD? I ask because the edges make it distinctive.

Follow-on question: if say it IS legal for 3BLD would it still be legal for use in MBLD? Clearly it’s distinctiveness could be used to aid the Cuber to ensure they were on the “correct” cube....
 

Aerma

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Do you think the new GTS3M will be legal for BLD? I ask because the edges make it distinctive.

Follow-on question: if say it IS legal for 3BLD would it still be legal for use in MBLD? Clearly it’s distinctiveness could be used to aid the Cuber to ensure they were on the “correct” cube....
As long as the ridges don't differ between pieces I don't see why it wouldn't be. As for MBLD, you're allowed to have cubes of significantly different sizes (eg. a mini Valk and a Big Sail) so I don't see this being a big issue.
 
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