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Random Blindfold Cubing Discussion

tseitsei

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What happened to the number of active 5BLD (and 4BLD solvers)? I can name a handful of capable sub-3 4BLD solvers but only 2 or 3 capable of sub-7 5BLD :(

I dont know but I would guess that 5bld is kind of frustrating to try and get a good official result, because no matter how good you are the success rate will always be much lower than in 4bld or 3bld
 

Stefan

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I dont know but I would guess that 5bld is kind of frustrating to try and get a good official result, because no matter how good you are the success rate will always be much lower than in 4bld or 3bld

Well, maybe someone is trying to go fast on 4BLD and safe on 5BLD, this could lead to higher 5BLD than 4BLD success rate.

Using data from WCA_export549_20141215 and Stefan's WCA Data Tools.

Cuber4BLD4BLD5BLD5BLD
Javier Tirado Ortiz5/4610.87%100.00%1/1
Lucas Wesche2/1216.67%100.00%1/1
Ben Whitmore1/119.09%33.33%1/3
Conor Cronin1/137.69%20.00%1/5
Mimmi Leckius10/2441.67%100.00%1/1
Patrick Kern4/1428.57%66.67%2/3
Shivam Bansal2/922.22%50.00%2/4
Cornelius Dieckmann5/2123.81%50.00%1/2
Alexey Oblaukhov1/616.67%33.33%1/3
Vojtěch Dvořák1/128.33%16.67%2/12
Bernett Orlando2/450.00%100.00%1/1
Muhammad Iril Khairul Anam3/1323.08%46.15%6/13
Arvis Tilgalis2/1612.50%25.00%1/4
Henrik Olsson4/1822.22%41.67%5/12
Akira Misawa (三沢昂)2/1118.18%33.33%1/3
John Brechon2/1612.50%22.22%2/9
Lars Vennike Nielsson6/3915.38%27.27%6/22
Walter Pereira Rodrigues de Souza5/2817.86%30.00%3/10
Dmitry Karyakin9/2733.33%54.55%12/22
Dennis Strehlau2/825.00%40.00%2/5
Daniel Beyer3/1816.67%25.00%2/8
Tomoki Kubo (久保友樹)2/450.00%75.00%3/4
Stefanus Anggara1/333.33%50.00%1/2
Yunqi Ouyang (欧阳韵奇)3/1816.67%22.22%2/9
Aldo Feandri6/2623.08%30.43%7/23
Wicaksono Adi2/1020.00%25.00%2/8
Antoine Cantin3/1618.75%22.22%2/9
Nevins Chan Pak Hoong (陈百鸿)10/2245.45%52.94%9/17
Aan Candra Nugroho1/812.50%14.29%1/7
Feliks Zemdegs3/2313.04%14.29%1/7
Roman Strakhov5/1241.67%45.45%5/11
Clément Gallet13/3438.24%40.00%2/5
Chester Lian19/4245.24%45.71%16/35
Tomoaki Okayama (岡山友昭)18/4143.90%44.00%11/25
Kevin Montano0/70.00%20.00%1/5
Howie Craig0/30.00%20.00%1/5
Prashanth Rebala0/30.00%33.33%1/3

Code:
[NOPARSE]SELECT concat(a.personId, '#444bf') Cuber,
       concat(a.solves, '/', (a.solves + a.DNFs)) '4BLD',
       a.solves / (a.solves + a.DNFs) '4BLD[%]',
       b.solves / (b.solves + b.DNFs) '5BLD[%]',
       concat(b.solves, '/', (b.solves + b.DNFs)) '5BLD'
FROM
(SELECT personId,
       sum((value1>0)+(value2>0)+(value3>0)+(value4>0)+(value5>0)) solves,
       sum((value1=-1)+(value2=-1)+(value3=-1)+(value4=-1)+(value5=-1)) DNFs
FROM Results WHERE eventId='444bf' GROUP BY personId) a
JOIN
(SELECT personId,
       sum((value1>0)+(value2>0)+(value3>0)+(value4>0)+(value5>0)) solves,
       sum((value1=-1)+(value2=-1)+(value3=-1)+(value4=-1)+(value5=-1)) DNFs
FROM Results WHERE eventId='555bf' GROUP BY personId) b
ON a.personId = b.personId
WHERE (b.solves / (b.solves + b.DNFs)) > (a.solves / (a.solves + a.DNFs))
ORDER BY (b.solves / (b.solves + b.DNFs)) / (a.solves / (a.solves + a.DNFs)) desc;[/NOPARSE]
 
Last edited:

tseitsei

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Well, maybe someone is trying to go fast on 4BLD and safe on 5BLD, this could lead to higher 5BLD than 4BLD success rate.

Using data from WCA_export549_20141215 and Stefan's WCA Data Tools.

Cuber4BLD4BLD5BLD5BLD
Javier Tirado Ortiz5/4610.87%100.00%1/1
Lucas Wesche2/1216.67%100.00%1/1
Ben Whitmore1/119.09%33.33%1/3
Conor Cronin1/137.69%20.00%1/5
Mimmi Leckius10/2441.67%100.00%1/1
Patrick Kern4/1428.57%66.67%2/3
Shivam Bansal2/922.22%50.00%2/4
Cornelius Dieckmann5/2123.81%50.00%1/2
Alexey Oblaukhov1/616.67%33.33%1/3
Vojtěch Dvořák1/128.33%16.67%2/12
Bernett Orlando2/450.00%100.00%1/1
Muhammad Iril Khairul Anam3/1323.08%46.15%6/13
Arvis Tilgalis2/1612.50%25.00%1/4
Henrik Olsson4/1822.22%41.67%5/12
Akira Misawa (三沢昂)2/1118.18%33.33%1/3
John Brechon2/1612.50%22.22%2/9
Lars Vennike Nielsson6/3915.38%27.27%6/22
Walter Pereira Rodrigues de Souza5/2817.86%30.00%3/10
Dmitry Karyakin9/2733.33%54.55%12/22
Dennis Strehlau2/825.00%40.00%2/5
Daniel Beyer3/1816.67%25.00%2/8
Tomoki Kubo (久保友樹)2/450.00%75.00%3/4
Stefanus Anggara1/333.33%50.00%1/2
Yunqi Ouyang (欧阳韵奇)3/1816.67%22.22%2/9
Aldo Feandri6/2623.08%30.43%7/23
Wicaksono Adi2/1020.00%25.00%2/8
Antoine Cantin3/1618.75%22.22%2/9
Nevins Chan Pak Hoong (陈百鸿)10/2245.45%52.94%9/17
Aan Candra Nugroho1/812.50%14.29%1/7
Feliks Zemdegs3/2313.04%14.29%1/7
Roman Strakhov5/1241.67%45.45%5/11
Clément Gallet13/3438.24%40.00%2/5
Chester Lian19/4245.24%45.71%16/35
Tomoaki Okayama (岡山友昭)18/4143.90%44.00%11/25
Kevin Montano0/70.00%20.00%1/5
Howie Craig0/30.00%20.00%1/5
Prashanth Rebala0/30.00%33.33%1/3

Code:
[NOPARSE]SELECT concat(a.personId, '#444bf') Cuber,
       concat(a.solves, '/', (a.solves + a.DNFs)) '4BLD',
       a.solves / (a.solves + a.DNFs) '4BLD[%]',
       b.solves / (b.solves + b.DNFs) '5BLD[%]',
       concat(b.solves, '/', (b.solves + b.DNFs)) '5BLD'
FROM
(SELECT personId,
       sum((value1>0)+(value2>0)+(value3>0)+(value4>0)+(value5>0)) solves,
       sum((value1=-1)+(value2=-1)+(value3=-1)+(value4=-1)+(value5=-1)) DNFs
FROM Results WHERE eventId='444bf' GROUP BY personId) a
JOIN
(SELECT personId,
       sum((value1>0)+(value2>0)+(value3>0)+(value4>0)+(value5>0)) solves,
       sum((value1=-1)+(value2=-1)+(value3=-1)+(value4=-1)+(value5=-1)) DNFs
FROM Results WHERE eventId='555bf' GROUP BY personId) b
ON a.personId = b.personId
WHERE (b.solves / (b.solves + b.DNFs)) > (a.solves / (a.solves + a.DNFs))
ORDER BY (b.solves / (b.solves + b.DNFs)) / (a.solves / (a.solves + a.DNFs)) desc;[/NOPARSE]

Yeah that is true :)

I meant that trying to get a GOOD (for your own level) official time on 5bld is hard and frustrating because if you go fast your success rate will probably be quite low :/

And that might lead to people training more of 3&4bld than 5bld. At least I find practising 4bld much more rewarding than 5bld because then I don't DNF most of the time :p
 
Last edited:
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How many cubers are able to solve a number of Rubik's Cubes blindfolded that is greater than their age (in years) in a MBLD attempt? :p

Cool idea, I've put this on my to-do list for the next year. It helps that my birthday was last month so it won't get harder any time soon. Not certain I have enough cubes though.

I was thinking Bill, but his official is 2/3. Anyone know if he's done any large attempts?
 

uesyuu

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I came up with new(?) BLD method, "Old Pochmann using DFR buffer".
Main algorithm is "Rw U R’ U’ R U R’ F’ R U R’ U’ R’ F R2 U2 Rw".
It's very easy to move, and parity algo is into M2 algo, which is"B' R2 B M2 B' R2 B".

Demerit is that setup B move is little hard to move.
 

tseitsei

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2012LEHT01
Hi everyone, just joinin the forum. I dont see anyone talking about big bld on this thread) What are your pbs for big bld (size and time, size is more important). Mine's 4x4 16:29, i have done 3 5x5 attempts so far and one 6x6 attempt, which wasn't that bad i guess, here's what i got View attachment 4771

For 4BLD I have 3:36.10 and for 5BLD 8:32.34. Haven't tried anything bigger because they are not official events so I don't "waste" time practising them...

In MBLD I have 21/21 in 56:xy though :)
 

tseitsei

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Wow, that's quite good, i haven't gone above 10 cubes yet. Russian NR is 19/20, which is close enough to yours) (as far as i understand you hold finnish nr, dont you?) And the guy who set it doesnt practice that much unfortunately, but there's another guy, who's pb is 16/16 and he's trying to get 18/18, so i hope one of them beats yours))) how long have you been into bld?

Yeah. I hold finnish nr for mbld altough it is just 13/17. I failed my last official attempt completely... 21/21 is my unofficial pb. Next comp I hope to get at least 15+ points
 

Pokelifter

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Alright, I have an idea for edge memorization that I'd like as many of you as possible to comment your opinions on. I'm not sure is this has been done before. Also I'm not sure if this is 100% relevant in this thread.

I currently memorize edges with letter pairs that I try to convert into images. My method is M2. What if every possible edge target, rather than corresponding with a letter, corresponds with a person, action and an object. When memorizing, one takes the person from the first target, the action from the second and the object from the third. An image is then created in the cubers mind of the person doing something with an object.
For example, if the following targets correspond with the following Person/Action/Object:
UB = Feliks Zemdegs/Solving/Cube
UR = Superman/Flying/Cape
UF = James Hetfield/Singing/Microphone
then solving UB->UR->UF would be memorized as Feliks Zemdegs flying with a microphone.

I know that there are memory methods based on person/action/object where every letter pair combination corresponds with one of a person, an action and an object. The problem that I find with this is how you figure out an action for combinations like IW or an object for OI. The pros of this system would be that you will always be able to come up with a concrete image without having to think about it for too long, you would also only need to remember one image per three targets. The cons might be that recognizing parity isn't immediate unlike with letter pairs.
Please reply with your opinion.
 

tseitsei

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Alright, I have an idea for edge memorization that I'd like as many of you as possible to comment your opinions on. I'm not sure is this has been done before. Also I'm not sure if this is 100% relevant in this thread.

I currently memorize edges with letter pairs that I try to convert into images. My method is M2. What if every possible edge target, rather than corresponding with a letter, corresponds with a person, action and an object. When memorizing, one takes the person from the first target, the action from the second and the object from the third. An image is then created in the cubers mind of the person doing something with an object.
For example, if the following targets correspond with the following Person/Action/Object:
UB = Feliks Zemdegs/Solving/Cube
UR = Superman/Flying/Cape
UF = James Hetfield/Singing/Microphone
then solving UB->UR->UF would be memorized as Feliks Zemdegs flying with a microphone.

I know that there are memory methods based on person/action/object where every letter pair combination corresponds with one of a person, an action and an object. The problem that I find with this is how you figure out an action for combinations like IW or an object for OI. The pros of this system would be that you will always be able to come up with a concrete image without having to think about it for too long, you would also only need to remember one image per three targets. The cons might be that recognizing parity isn't immediate unlike with letter pairs.
Please reply with your opinion.

Well I pretty much do something like this already but without preset list of words and with more flexibility because of that.

It's hard to give an example because I memo partly in Finnish and partly in English... Ollie has some good posts about using flexible words and sentences while memoing... I try to memo somewhat similarly to him. Obviously I am much slower tough :p
 
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memo stuff

I've been doing that for a couple of years, only with 4 letters instead of 3 in a group (parity is easier to recognise), and with a separate system for corners and edges (I assigned one lot by labelling stickers with English letters, the other using Greek letters which I know from maths/science) so that it's easier to switch between piece types on multi/big cubes and I don't need to keep track of where it changes. It's helpful for doing megaBLD I think. Roughly speaking I had: 'person' (usually a Pokemon), action, other thing (usually weather based), object. Obviously this is customisable.

I chose to do that, knowing it was probably slower (pretty convinced it is now) because doing stuff like megaminx seemed fun and I didn't think I would get fast anyway. Now, I'm top-10 for 5BLD and I decided to take this stuff more seriously. I've now made something much closer to standard letter pairs but with some of my own style imposed (version 2 now, I tried to be too clever with version 1 and it failed :p) which I'll be learning whenever I have enough free time, so that I can memo faster. I plan to keep my old system in place for megaminx and other puzzles where it might be helpful to have more than 23 targets, even though there are other options like having two letters per target.

In summary: it's easier to learn and more flexible if you want to add stuff to it, but for cubes I believe it's slower than letter pairs. That's just my opinion though, but I hope it helps.
 
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