2x2 single WR at Trentin Open 2011

[BlueDevil]

How did the WCA delegate let a 4 move scramble slide?

If I saw that scramble, I would scratch it and generate a new one...

 

[qqwref]

There have been many 4-move scrambles in competition before. Also, delegates are specifically NOT supposed to throw out easy scrambles.

 

[hcfong]

How did the WCA delegate let a 4 move scramble slide?

If I saw that scramble, I would scratch it and generate a new one...

I don't think it was a 4 move scramble, but a scramble with a 4 move solution. As it is a random state, albeit an easy one, it's perfectly legal so the WCA delegate shouldn't discard it. And besides, it would be difficult because the determine whether a scramble is too easy, the delegate has to go through all the scrambles, with the consequence that he can't compete because he has seen the scrambles before.

 

[Kian]

Also, delegates are specifically NOT supposed to throw out easy scrambles.

I would be interested to know what part of the regulations you interpret as saying this.

 

[ThomasJE]

I don't think it was a 4 move scramble, but a scramble with a 4 move solution. As it is a random state, albeit an easy one, it's perfectly legal so the WCA delegate shouldn't discard it. And besides, it would be difficult because the determine whether a scramble is too easy, the delegate has to go through all the scrambles, with the consequence that he can't compete because he has seen the scrambles before.

There's a video with all 3 of the WR breaking solves.

Spoiler

It says at the end of the video the scramble and the solution.
It was a 4 move scramble, and a 4 move solution that wasn't an inverse.

 

[kinch2002]

It was a 4 move scramble, and a 4 move solution that wasn't an inverse.

Yes it was inverse actually. 2x2 can deceive you like that

 

[hcfong]

I admit I was wrong. I should have watched the video before commenting

 

[ThomasJE]

This is where we need an optimal state scrambler. I think Prisma Puzzle Timer has one for the 2x2 cube, so that could be used in the future.

 

[samehsameh]

I got my first usable 2x2 3 days ago ive done 1 average of 100 @ 13.xx with best 6.39 i just did this scramble in 1.35 If qqtimer gave me this i would LOL and rescramble. WR's should be impressive this isnt to me. If i can do it that fast then with these current averages and bests its too easy.

 

[Bob]

This is where we need an optimal state scrambler. I think Prisma Puzzle Timer has one for the 2x2 cube, so that could be used in the future.

I'm pretty sure the WCA scrambler is also optimum for 2x2.

 

[ThomasJE]

I'm pretty sure the WCA scrambler is also optimum for 2x2.

Every 2x2 scramble needs 11 moves maximum to solve. If there was a 4 move scramble, it can't be optimum.

 

[aronpm]

Every 2x2 scramble needs 11 moves maximum to solve. If there was a 4 move scramble, it can't be optimum.

That's not how it works. There is a distribution of optimal lengths. There are some cases which require a minimum of 11 moves to solve, and there are some that only require 2 moves.

Here's a scramble: R U

Last time I checked, the optimal solution to that position wasn't 11 moves. The 2 move scramble was optimal.

 

[~Adam~]

Every 2x2 scramble needs 11 moves maximum to solve. If there was a 4 move scramble, it can't be optimum.

What? Optimum means the shortest scramble to get to a particular random state.

edit - Ninja'd

 

[ThomasJE]

That's not how it works. There is a distribution of optimal lengths. There are some cases which require a minimum of 11 moves to solve, and there are some that only require 2 moves.

Here's a scramble: R U

Last time I checked, the optimal solution to that position wasn't 11 moves. The 2 move scramble was optimal.

I must have got confused. What I meant was that here is where we need a scramble generator that generates scrambles that need 11 moves minimum to solve (optimal state). Then, the times would be more based on method and TPS.

 

[aronpm]

I must have got confused. What I meant was that here is where we need a scramble generator that generates scrambles that need 11 moves minimum to solve (optimal state). Then, the times would be more based on method and TPS.

Do you even realize how few positions that is? It's a terrible idea. Speedcubing is not about solving random positions at the diameter of the cube group, it is about solving random positions.

 

[Stefan]

we need a scramble generator that generates scrambles that need 11 moves minimum to solve

It should require the maximum number of quarter turns as well (14 quarter turns) to ensure it's really hard. Then everybody just needs to learn 108 algorithms to play God (probably fewer, thanks to symmetries).

 

[qqwref]

Hey, that actually sounds like a pretty fun unofficial event.

 

[GlowingSausage]

The world record was only beaten once, because the 0.69 was the first solve

but the time ( 0.96 ) was beaten 3 times

 

[Jaycee]

but the time ( 0.96 ) was beaten 3 times

That's not how WRs work

 

[cubersmith]

but the time ( 0.96 ) was beaten 3 times

lets just count how many times the WR was beaten, since you seem to not understand.

0.96 -> 0.69 = 1

There we go, it was beaten once.