Thread - Sudoku 8X8 — LMI May Sudoku Test

Posts: 739

Country : India

vopani posted @ 2012-05-07 10:51 AM

devarajand - 2012-05-07 7:46 AM

Can one take a break between part A and B

It does not say you have to take both parts together and 'independent parts' surely implies that you can take as long a break in between as you like. Also, I'm sure you can participate in Part B before Part A if you wish, there doesn't seem to be any restriction.

@ 2012-05-07 10:55 AM (#7200 - in reply to #7197) (#7200) Top

Posts: 739

Country : India

vopani posted @ 2012-05-07 10:55 AM

sinchai4547 - 2012-05-07 10:19 AM

In X sum sudoku: the clue is on the right puzzle at column 4. The number 8 is wrong. 9 is correct?

Yes, you are correct. it should be '9' on the RHS of row4.

@ 2012-05-07 11:03 AM (#7201 - in reply to #7186) (#7201) Top

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Country : India

vopani posted @ 2012-05-07 11:03 AM

In B14: Odd-Even View Skyscraper Sudoku,
What is the use of 'skyscraper'? Isn't it simply an 'Odd-Even View Sudoku'?

@ 2012-05-07 11:12 AM (#7202 - in reply to #7199) (#7202) Top

Country : India

Administrator posted @ 2012-05-07 11:12 AM

Rohan Rao - 2012-05-07 10:51 AM

devarajand - 2012-05-07 7:46 AM

Can one take a break between part A and B

There will absolutely be no restrictions between two parts. Breaks are allowed. And you are allowed to start part B before part A.

@ 2012-05-07 11:23 AM (#7203 - in reply to #7201) (#7203) Top

Country : India

Administrator posted @ 2012-05-07 11:23 AM

Rohan Rao - 2012-05-07 11:03 AM

In B14: Odd-Even View Skyscraper Sudoku,
What is the use of 'skyscraper'? Isn't it simply an 'Odd-Even View Sudoku'?

Yes, it is Odd Even View Sudoku.

@ 2012-05-07 11:32 AM (#7204 - in reply to #7203) (#7204) Top

deu

Posts: 69

Country : Japan

deu posted @ 2012-05-07 11:32 AM

Administrator - 2012-05-07 11:23 AM

Rohan Rao - 2012-05-07 11:03 AM

In B14: Odd-Even View Skyscraper Sudoku,
What is the use of 'skyscraper'? Isn't it simply an 'Odd-Even View Sudoku'?

Yes, it is Odd Even View Sudoku.

No. The example has multiple solutions as an 'Odd-Even View Sudoku' (We can swap 5 and 6 in Column 2/3).

@ 2012-05-07 11:38 AM (#7205 - in reply to #7203) (#7205) Top

Posts: 739

Country : India

vopani posted @ 2012-05-07 11:38 AM

The total points is 808 and time is 128 minutes. That means, a player who finishes all puzzles within the time limit is solving at the speed of at least 6-7 (and maybe more) points per minute, whereas the time bonus is just 3 points per minute. I think the time bonus should be increased.

In particular, players completing Part A and Part B would be solving at a speed greater than 5.5 points per minute and 7 points per minute respectively. The time bonus of 3 points per minute looks meager and will surely not give a good indication of the different of performances of players who complete the test before time.

Obvious Issue: Players completing Part B should be given a higher time bonus than those completing Part A.

@ 2012-05-07 11:39 AM (#7206 - in reply to #7204) (#7206) Top

Country : India

Administrator posted @ 2012-05-07 11:39 AM

deu - 2012-05-07 11:32 AM

Administrator - 2012-05-07 11:23 AM

Rohan Rao - 2012-05-07 11:03 AM

In B14: Odd-Even View Skyscraper Sudoku,
What is the use of 'skyscraper'? Isn't it simply an 'Odd-Even View Sudoku'?

Yes, it is Odd Even View Sudoku.

No. The example has multiple solutions as an 'Odd-Even View Sudoku' (We can swap 5 and 6 in Column 2/3).

Apologies. My mistake.

@ 2012-05-07 11:45 AM (#7207 - in reply to #7206) (#7207) Top

Posts: 164

Country : Slovakia

greenhorn posted @ 2012-05-07 11:45 AM

Administrator - 2012-05-07 11:39 AM

deu - 2012-05-07 11:32 AM

Administrator - 2012-05-07 11:23 AM

Rohan Rao - 2012-05-07 11:03 AM

In B14: Odd-Even View Skyscraper Sudoku,
What is the use of 'skyscraper'? Isn't it simply an 'Odd-Even View Sudoku'?

Yes, it is Odd Even View Sudoku.

No. The example has multiple solutions as an 'Odd-Even View Sudoku' (We can swap 5 and 6 in Column 2/3).

Apologies. My mistake.

There is a difference between OEVS and OEVSS. If you have in one row numbers "213..." the first visible odd skyscraper is 3, because 1 is covered by 2.

@ 2012-05-07 11:48 AM (#7208 - in reply to #7205) (#7208) Top

Posts: 164

Country : Slovakia

greenhorn posted @ 2012-05-07 11:48 AM

Rohan Rao - 2012-05-07 11:38 AM

The total points is 808 and time is 128 minutes. That means, a player who finishes all puzzles within the time limit is solving at the speed of at least 6-7 (and maybe more) points per minute, whereas the time bonus is just 3 points per minute. I think the time bonus should be increased.

In particular, players completing Part A and Part B would be solving at a speed greater than 5.5 points per minute and 7 points per minute respectively. The time bonus of 3 points per minute looks meager and will surely not give a good indication of the different of performances of players who complete the test before time.

Obvious Issue: Players completing Part B should be given a higher time bonus than those completing Part A.

Yes, we know about it. We will talk about it with Deb soon. The bonuses may be changed.

@ 2012-05-07 11:51 AM (#7209 - in reply to #7207) (#7209) Top

Posts: 739

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vopani posted @ 2012-05-07 11:51 AM

greenhorn - 2012-05-07 11:45 AM

There is a difference between OEVS and OEVSS. If you have in one row numbers "213..." the first visible odd skyscraper is 3, because 1 is covered by 2.

Ok. I get it. The example doesn't have any such case, so it was misleading. Thanks.

@ 2012-05-07 12:21 PM (#7210 - in reply to #7209) (#7210) Top

prasanna16391

Posts: 1801

Country : India

prasanna16391 posted @ 2012-05-07 12:21 PM

Rohan Rao - 2012-05-07 11:51 AM

greenhorn - 2012-05-07 11:45 AM

There is a difference between OEVS and OEVSS. If you have in one row numbers "213..." the first visible odd skyscraper is 3, because 1 is covered by 2.

Ok. I get it. The example doesn't have any such case, so it was misleading. Thanks.

It did have a few examples I think, not exactly like the 213, but skyscraper logic was required. The "2" below R6C5 had to be satisfied in the first cell itself, since the 5 would block vision towards the 2. This is not the case in Even Odd View I guess, you could've had 5 in the first cell and 2 in the next with the "2" outside clue. (I'm saying this with memory of solving yesterday, so the placements may be a bit off, but the logic was there)

@ 2012-05-07 12:59 PM (#7211 - in reply to #7198) (#7211) Top

Country : India

Administrator posted @ 2012-05-07 12:59 PM

deu - 2012-05-07 10:45 AM

I have one question about B6 (Surplus-deficit sudoku).
Are there any restrictions for regions with exactly 8 cells?

We will update the instructions - "In regions with less than or equal to 8 cells, the numbers should not repeat."

@ 2012-05-07 1:01 PM (#7212 - in reply to #7198) (#7212) Top

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greenhorn posted @ 2012-05-07 1:01 PM

deu - 2012-05-07 10:45 AM

I have one question about B6 (Surplus-deficit sudoku).
Are there any restrictions for regions with exactly 8 cells?

In the competition, there will be no regions with 8 cells.
In the IB, you should aply both rules at once - in region with 6 cells no digits may repeat and each digit should appear at least once.

@ 2012-05-07 2:38 PM (#7213 - in reply to #7186) (#7213) Top

swaroop2011

Posts: 668

Country : India

swaroop2011 posted @ 2012-05-07 2:38 PM

will the sizes be same in the competition as in the IB like 6*6 and all or all will be 9*9 ??

@ 2012-05-07 2:50 PM (#7214 - in reply to #7213) (#7214) Top

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greenhorn posted @ 2012-05-07 2:50 PM

This test is all about Sudoku 8x8, so all the puzzles will have such size.

Edited by greenhorn 2012-05-07 2:51 PM

@ 2012-05-07 3:13 PM (#7215 - in reply to #7214) (#7215) Top

swaroop2011

Posts: 668

Country : India

swaroop2011 posted @ 2012-05-07 3:13 PM

greenhorn - 2012-05-07 2:50 PM

This test is all about Sudoku 8x8, so all the puzzles will have such size.

yeah thanks

@ 2012-05-08 12:41 AM (#7220 - in reply to #7186) (#7220) Top

Richard

Posts: 191

Country : The Netherlands

Richard posted @ 2012-05-08 12:41 AM

The theme of part B is ...without regularly placed regions... but most of the example puzzles are 'regular' 2x3 blocks. How do I have to see this?
Thanks in advance!

Best regards, Richard

@ 2012-05-08 1:09 AM (#7221 - in reply to #7220) (#7221) Top

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Country : Slovakia

greenhorn posted @ 2012-05-08 1:09 AM

Richard - 2012-05-08 12:41 AM

The theme of part B is ...without regularly placed regions... but most of the example puzzles are 'regular' 2x3 blocks. How do I have to see this?
Thanks in advance!

Best regards, Richard

It is just a IB. We were not able to construct 28 original 8x8 puzzles for Instruction booklet. We believe, that for understanding the rules/instructions it is enough to have smaller puzzles in IB. And also, it is not possible to rotate half of the rectangles in 6x6 puzzle as in 8x8 puzzle (see the classics A1-2 and B1-2 in the IB).

@ 2012-05-08 1:25 AM (#7222 - in reply to #7221) (#7222) Top

Richard

Posts: 191

Country : The Netherlands

Richard posted @ 2012-05-08 1:25 AM

greenhorn - 2012-05-08 1:09 AM

No problem!
I just wondered if more grids would have irregular shapes than the presented puzzles in B1-2, B4, B5, B6, B11 and B12.
I know how much work it is preparing a test plus IB. Having no less than 28 puzzles (x2) isn't making this easier!
I am looking forward to the test, since 14 puzzles for a bit over an hour seems like that there are a few quickies to be done, even for a midrange-solver like me.

@ 2012-05-08 2:01 AM (#7223 - in reply to #7222) (#7223) Top

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Country : Slovakia

greenhorn posted @ 2012-05-08 2:01 AM

Richard - 2012-05-08 1:25 AM

greenhorn - 2012-05-08 1:09 AM

Richard, you´re absolutely right. Some of the puzzles will be easier (it is not hard to discover which ones), so that is why we even haven´t tought about bigger (harder) puzzles in IB. And of course, we want to keep the best puzzles for the competition.
All the irregular puzzles (as Irregular sudoku, Surplus-deficit or Irregular without regions) are irregular in IB. Only the usual variants, which will have rotated regions, are unrotated in the IB.

@ 2012-05-10 12:20 AM (#7226 - in reply to #7186) (#7226) Top

Posts: 164

Country : Slovakia

greenhorn posted @ 2012-05-10 12:20 AM

Dear puzzle friends,
in Foursome sudoku (A11-14) there are four sudoku grids and the points may be distributed for each grid independently. However we accept only solution, that is valid for all four puzzle grids together!
This sentence is missing in the IB, but we believe, that it was clear also before.

Thank you for understanding!

Edited by greenhorn 2012-05-10 12:20 AM

@ 2012-05-10 12:30 AM (#7227 - in reply to #7186) (#7227) Top

joshuazucker

Posts: 31

Country : United States

joshuazucker posted @ 2012-05-10 12:30 AM

I think there's a typo in B8: the 8 on the right edge should be 3+5+1 = 9.

Looks like this will be a fun test!

@ 2012-05-10 3:55 AM (#7228 - in reply to #7197) (#7228) Top