Special 8 — January Sudoku Test — 25th-27th January
@ 2014-01-20 9:37 PM (#14142) (#14142) Top

Administrator



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Administrator posted @ 2014-01-20 9:37 PM



@ 2014-01-20 9:39 PM (#14143 - in reply to #14142) (#14143) Top

Administrator



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Country : India

Administrator posted @ 2014-01-20 9:39 PM


Logic Masters India announces January Sudoku Test - Special 8

Dates : 25th — 27th Jan

Instruction Booklet & Submission : Link

Authors : Gabriele Simionato – Zuino Giochi

@ 2014-01-21 3:04 AM (#14145 - in reply to #14143) (#14145) Top

tamz29



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tamz29 posted @ 2014-01-21 3:04 AM

So in puzzle 16 , all symbols are given?
@ 2014-01-21 3:51 AM (#14147 - in reply to #14145) (#14147) Top

Gabrieleud



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Country : ITALY

Gabrieleud posted @ 2014-01-21 3:51 AM

tamz29 - 2014-01-21 3:04 AM

So in puzzle 16 , all symbols are given?


Yes, all symbols are given
@ 2014-01-21 5:24 AM (#14149 - in reply to #14147) (#14149) Top

achan1058



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achan1058 posted @ 2014-01-21 5:24 AM

Isn't it supposed to be "Wood", not "Snow"?
@ 2014-01-21 10:09 AM (#14150 - in reply to #14149) (#14150) Top

Administrator



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Administrator posted @ 2014-01-21 10:09 AM

No online solving

LMI's solving interface does not support some of the sudokus (e.g. Dragons, Eight Fit). To some extent, REALLY LATIN SQUARE will also be difficult to solve online with pencil marks overriding the given symbols.

So, online solving will not be available for this Sudoku test.

@ 2014-01-21 6:12 PM (#14151 - in reply to #14149) (#14151) Top

Gabrieleud



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Country : ITALY

Gabrieleud posted @ 2014-01-21 6:12 PM

achan1058 - 2014-01-21 5:24 AM

Isn't it supposed to be "Wood", not "Snow"?


Well... you are right. That was the original idea

But the kanji (or hanzi, for chinese readers) for "wood, tree" is far too similar to "water" or "fire" and "earth" to a non-trained eye. This could have been a disadvantage for players who are not used to read ideograms.
So I decided myself for using a kanji that looks different in shape to the others.
@ 2014-01-22 10:24 AM (#14156 - in reply to #14151) (#14156) Top

Yuhei Kusui



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Yuhei Kusui posted @ 2014-01-22 10:24 AM

Gabrieleud - 2014-01-21 6:12 PM

achan1058 - 2014-01-21 5:24 AM

Isn't it supposed to be "Wood", not "Snow"?


Well... you are right. That was the original idea

But the kanji (or hanzi, for chinese readers) for "wood, tree" is far too similar to "water" or "fire" and "earth" to a non-trained eye. This could have been a disadvantage for players who are not used to read ideograms.
So I decided myself for using a kanji that looks different in shape to the others.


Reference for who have interested in Kanji:



(kanji.jpg)



Attachments
----------------
Attachments kanji.jpg (19KB - 4 downloads)
@ 2014-01-22 8:09 PM (#14157 - in reply to #14142) (#14157) Top

Gabrieleud



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Gabrieleud posted @ 2014-01-22 8:09 PM

Hello Yuhei, nice seeing you partecipating in this competition. And thanks for the visual contribution!
@ 2014-01-22 8:46 PM (#14158 - in reply to #14157) (#14158) Top

kishy72



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kishy72 posted @ 2014-01-22 8:46 PM

Can the duration of this test be extended by 8+8+8+8 mins?
@ 2014-01-23 3:23 PM (#14161 - in reply to #14150) (#14161) Top

devarajand



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devarajand posted @ 2014-01-23 3:23 PM

At least where possible on line solving be permitted
@ 2014-01-23 4:20 PM (#14162 - in reply to #14158) (#14162) Top

prasanna16391



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prasanna16391 posted @ 2014-01-23 4:20 PM

kishy72 - 2014-01-22 8:46 PM

Can the duration of this test be extended by 8+8+8+8 mins?


Having test solved it, I think 88 minutes is suitable for this one.
@ 2014-01-23 4:27 PM (#14163 - in reply to #14161) (#14163) Top

Administrator



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Administrator posted @ 2014-01-23 4:27 PM

devarajand - 2014-01-23 3:23 PM

At least where possible on line solving be permitted


Unfortunately, time constraints play a part in these things too. We will certainly consider enabling partial online solving in the future, but it's a bit too late to prepare it for this test. Please make do this time.
@ 2014-01-24 12:22 PM (#14169 - in reply to #14142) (#14169) Top

TiiT



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TiiT posted @ 2014-01-24 12:22 PM

In the first puzzle it has said, that there are highlighted 3x3 regions and then it says puzzle number 2 and 3 contains digits from 1 to 8. Do we need to keep one cell empty, do we have to expect 2x4 boxes or can we expect the highlighted areas to be irregular?
@ 2014-01-24 12:32 PM (#14170 - in reply to #14169) (#14170) Top

prasanna16391



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prasanna16391 posted @ 2014-01-24 12:32 PM

TiiT - 2014-01-24 12:22 PM

In the first puzzle it has said, that there are highlighted 3x3 regions and then it says puzzle number 2 and 3 contains digits from 1 to 8. Do we need to keep one cell empty, do we have to expect 2x4 boxes or can we expect the highlighted areas to be irregular?


2x4 boxes. Normal 8x8 Classic. You're right, the rules aren't completely clear in the IB. Missed that.
@ 2014-01-24 3:50 PM (#14171 - in reply to #14147) (#14171) Top

Christian



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Christian posted @ 2014-01-24 3:50 PM

In puzzle 16 there is a missing symbol, at the bottom, right side : 3-7 is not only odd but also prime
@ 2014-01-24 4:34 PM (#14173 - in reply to #14171) (#14173) Top

Gabrieleud



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Country : ITALY

Gabrieleud posted @ 2014-01-24 4:34 PM

Christian - 2014-01-24 3:50 PM

In puzzle 16 there is a missing symbol, at the bottom, right side : 3-7 is not only odd but also prime


You're right, a symbol is missing. Sent an update for the IB. Thanks for your contribution.
@ 2014-01-24 7:23 PM (#14174 - in reply to #14142) (#14174) Top

neerajmehrotra



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neerajmehrotra posted @ 2014-01-24 7:23 PM

Two puzzle booklets have been uploaded....which one to download????
@ 2014-01-24 7:58 PM (#14175 - in reply to #14174) (#14175) Top

Gabrieleud



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Country : ITALY

Gabrieleud posted @ 2014-01-24 7:58 PM

neerajmehrotra - 2014-01-24 7:23 PM

Two puzzle booklets have been uploaded....which one to download????


You can download either one.
"16 pages test" contains 1 puzzle every page.
"9 pages test" contains 2 puzzles every page, and it's meant to save paper printing at the cost of cell dimensions. Arrow+8 and Symbols puzzles anyway are on a single sheet.
@ 2014-01-24 9:33 PM (#14176 - in reply to #14175) (#14176) Top

Gabrieleud



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Country : ITALY

Gabrieleud posted @ 2014-01-24 9:33 PM

WARNING: correction needed to contest puzzle n.16
If you are going to solve puzzle nr 16 before the file is updated, please bear in mind this change.
A symbol was missing in 2nd row, right side. This is the correct layout:



(symbols8.jpg)



Attachments
----------------
Attachments symbols8.jpg (9KB - 0 downloads)
@ 2014-01-25 12:34 AM (#14179 - in reply to #14142) (#14179) Top

prasanna16391



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prasanna16391 posted @ 2014-01-25 12:34 AM

Announcements

  • New Instruction booklet uploaded.
    Change -
    Classic 8x8 rules are clearer. Example of N.16 Symbols fixed.

  • New Puzzle Booklets uploaded.
    Change - Slight error in puzzle 16 fixed.

  • @ 2014-01-25 7:03 AM (#14180 - in reply to #14142) (#14180) Top

    debmohanty




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    debmohanty posted @ 2014-01-25 7:03 AM

     What was your opinion of the booklet formatting and printing? I have a different complaint


    I think including a (bit-map based) logo in every page of the password protected booklet slows down the printing.

    It is better to have no additional frills in the passwod protected booklet, other than just the puzzles/instructions/points. After the test is over, we can put whatever else is desired.
    @ 2014-01-25 8:02 AM (#14181 - in reply to #14142) (#14181) Top

    Gotroch



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    Gotroch posted @ 2014-01-25 8:02 AM

     How balanced do you think the puzzle types of this test were? Fairly balanced
     What was your opinion of the distribution of easy/hard puzzles? Too many easy puzzles
     What did you think about the puzzle quality of the test? Fairly Nice
     How did you feel about the length / time limit for this test? Just right
     What was your opinion of the booklet formatting and printing? Just right


    @ 2014-01-25 8:23 AM (#14182 - in reply to #14142) (#14182) Top

    achan1058



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    achan1058 posted @ 2014-01-25 8:23 AM

     How balanced do you think the puzzle types of this test were? Perfectly balanced
     What was your opinion of the distribution of easy/hard puzzles? Too many easy puzzles
     What did you think about the puzzle quality of the test? Fairly Nice
     How did you feel about the length / time limit for this test? Just right
     Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? Most puzzles were worth the right amount
     What was your opinion of the booklet formatting and printing? Just right


    @ 2014-01-25 4:32 PM (#14184 - in reply to #14182) (#14184) Top

    kishy72



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    kishy72 posted @ 2014-01-25 4:32 PM

    i)Can someone give me the start in the example puzzle for symbols?I am just not able to see the breakthrough.It looks as though the puzzle requires a combination of strategies and not just one to rely on.

    ii)In Really Latin square am i right in stating that the following are the conversions possible ? :
    1 - 1234678
    2 - 2378
    3 - 38
    4 - 4
    5 - 45678
    6 - 678
    7 - 78
    8 - 8
    @ 2014-01-25 5:14 PM (#14185 - in reply to #14142) (#14185) Top

    TiiT



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    TiiT posted @ 2014-01-25 5:14 PM

     How balanced do you think the puzzle types of this test were? Fairly balanced
     What did you think about the puzzle quality of the test? Average
     How did you feel about the length / time limit for this test? Just right
     Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? Many puzzles were worth too much or too little
     What was your opinion of the booklet formatting and printing? Just right


    I don't know how about the others, but these symbols just were so confusing. Two of them are almost the same.
    @ 2014-01-25 8:48 PM (#14186 - in reply to #14142) (#14186) Top

    Fred76




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    Fred76 posted @ 2014-01-25 8:48 PM

    Thanks for the nice test.

    the test has lot of funny innovations, I appreciated every sudoku. Strictly speaking, brickdoku and really latin square are not sudokus, but latin squares. But as a "sudoku specialist" I prefer to have a few latin squares variants than puzzlish sudoku variants. So it was not a problem for me.

    My only small concern was with formatting. It's probably not a bad idea to have 2 pdf's and the player can chose to have 2 sudokus each page or only one bigger. For me it's ok to have 2 sudokus each page, so I opened the 9 pages pdf. But I found that the grids were too small. You can certainly enlarge the sudokus with a different layout (rules smaller, on the side of the sudokus, codes indications smaller, etc...).

    I don't feel very competitive this month, so I just decided to take part and have fun, without giving me pressure. Looking at my result could make think that I'm not able to solve hard puzzles, as I missed the 3 high-pointers. I certainly had a very bad strategy as I just solved the sudokus in order of appearance. After 75 minutes, I had all but the arrows+8 and symbols, but I did a mistake at the end of toroidal dragons, inverting some 6's and 7's. Then I took around 1 minute to look at the symbols but didn't found the entrance, so I tried to solve the arrows+8. I was a bit slow, it took me ~15 minutes to solve it. After the test, I solved the symbols (around the same solving time as arrows+8) and it's perhaps my favorite of the set. Very nice logical solving path .

    Thanks again !

    Fred
    @ 2014-01-25 8:52 PM (#14187 - in reply to #14184) (#14187) Top

    prasanna16391



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    prasanna16391 posted @ 2014-01-25 8:52 PM

    kishy72 - 2014-01-25 4:32 PM

    i)Can someone give me the start in the example puzzle for symbols?I am just not able to see the breakthrough.It looks as though the puzzle requires a combination of strategies and not just one to rely on.

    ii)In Really Latin square am i right in stating that the following are the conversions possible ? :
    1 - 1234678
    2 - 2378
    3 - 38
    4 - 4
    5 - 45678
    6 - 678
    7 - 78
    8 - 8



    i) Have you noticed that a converse rule applies?
    ii) Yes.
    @ 2014-01-25 9:13 PM (#14188 - in reply to #14186) (#14188) Top

    debmohanty




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    debmohanty posted @ 2014-01-25 9:13 PM

    Fred76 - 2014-01-25 8:48 PM
    My only small concern was with formatting. It's probably not a bad idea to have 2 pdf's and the player can chose to have 2 sudokus each page or only one bigger. For me it's ok to have 2 sudokus each page, so I opened the 9 pages pdf. But I found that the grids were too small. You can certainly enlarge the sudokus with a different layout (rules smaller, on the side of the sudokus, codes indications smaller, etc...).
    Apart from being a personal perference, lesser # of pages will also print faster. Some recent examples of how to fit in 2 sudokus per page without sacrificing on grid size - Portrait layout (ISC 2013) OR Landscape layout (Best of LMI sudoku tests)
    @ 2014-01-25 10:08 PM (#14190 - in reply to #14142) (#14190) Top

    kishy72



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    kishy72 posted @ 2014-01-25 10:08 PM

     How balanced do you think the puzzle types of this test were? Fairly balanced
     What was your opinion of the distribution of easy/hard puzzles? Too many medium difficult puzzles
     What did you think about the puzzle quality of the test? Very nice
     How did you feel about the length / time limit for this test? Way too many puzzles (too little time)
     Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? Most puzzles were worth the right amount
     What was your opinion of the booklet formatting and printing? Just right


    All right!I was waiting for my head to settle and that has finally happened!.I felt as if my head was going to explode during the test.
    The throbbing and the pulsation have dropped now and the grey matter definitely got kicked around during the test!

    I certainly tried to solve at a pace which I had never attempted before and would never try when I solve leisurely.So this sprint test did help me to try out something new .

    While it would be interesting and innovative to have these kind of sprint tests once in a while,I am never really in favour of tests with a shorter duration continuously.Apart from killing the fun quotient to an extent(you never really get to remember what actually made you solve a difficult puzzle which is very essential to getting better or get a sense of completion) there is also the danger of getting stuck eternally on a single puzzle and never really be able to 'move on'.

    For instance,I was close to going crazy after I got stuck in the Consecutive sudoku for about 15 mins.The panic level began to rise astronomically and my mind never really felt like proceeding to the next sudoku after spending so much time on that.But thankfully I gave up on it and tried the killer and came back on to the consecutive once again to make a guess and take it to completion.That single sudoku managed to eat up 25 mins i.e more than one fourth of the allotted time.But the risk was certainly there and I would have left 2 puzzles and thus lost 120 points in the process if I had not gone to the next.This would be even worse when the same scenario occurs much earlier in the test and when people are clueless whether to persist or to proceed.

    Unfortunately these kind of sprint tests seem to be the order of the day as even the WPF Grand prix rounds favour 'shorter formats'and the sooner I get used to these sprint tests the better I think.

    The test by itself was nice but just short on time and on a lighter note it looks as if only the Japanese would be completing the Japanese symbols sudoku!.

    Lastly,Thanks to the Italian Authors for taking the pain to create this test!!
    @ 2014-01-26 7:38 AM (#14192 - in reply to #14190) (#14192) Top

    prasanna16391



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    prasanna16391 posted @ 2014-01-26 7:38 AM

    kishy72 - 2014-01-25 10:08 PM

    While it would be interesting and innovative to have these kind of sprint tests once in a while,I am never really in favour of tests with a shorter duration continuously.


    I prefer long tests too, but you're right about needing to get used to it. In addition to the GP which you have mentioned, the WSC is built on short duration rounds at a generally harder difficulty than the GP. This same contest might have been a 60 minute round (and that'd be one of the longer rounds) at most in a WSC, going by my own testing time on it and comparing that to my proportionate scoring in a WSC round in general (Obviously, this is only considering the last 3 years' WSCs which I have attended). Preferences go towards both short duration and long duration rounds so it's best for organizers to have a bit of both and for competitors to get used to both
    @ 2014-01-26 9:46 PM (#14195 - in reply to #14184) (#14195) Top

    tamz29



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    tamz29 posted @ 2014-01-26 9:46 PM

    Hello Kishy,
    With these fragment-type puzzles (Digital Sudoku, Ikebana and so forth) you need to learn
    which "givens" can end up as which numbers. The table you typed in was the case for this puzzle.

    To solve puzzles of this genre you need good notes.
    In extreme cases, just write out all the possible candidates in EVERY square.
    With experience, you'll learn to find out which ones are worth notating.
    Look for clusters like: 567, 57, 67 in a row or column. You can then cross out 5,6,7s in the
    remaining squares of the same row/column.

    If you want the run-down for this puzzle specifically:
    I actually found it quite hard. 8s and 4s are automatic fill-ins. In some cases, 3s (III=3 or 8) 7s and 6s can
    be deduced in rows/columns where you've filled in the 8.
    Also helpful to keep in mind that 5 is just a V. Cells with I,II,III cannot take a 5.
    There was one point where I had a grid with lots of cells with 2-possible outcomes, but no guessing was needed for me.
    Eventually, with patience, the puzzle solves itself.

    ===
    About the page format:
    I'm going to say the same as Fred. A lot of each page is wasted where you can enlarge the grid, even when there's two puzzle per page.
    The dragons puzzle was very affected by the limited notation space.

    About the puzzles:
    Nothing outstanding about the basic variants. I think consecutive was overvalued.
    My favourite is the Toroidal Dragons. I thought it required some very good insights to make progress.

    Thanks for the test!
    @ 2014-01-26 9:49 PM (#14196 - in reply to #14142) (#14196) Top

    neerajmehrotra



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    neerajmehrotra posted @ 2014-01-26 9:49 PM

    Nice puzzles....ended up with one typo....hope my claim is admitted....thanks to the organisers and the authors
    @ 2014-01-27 2:09 PM (#14203 - in reply to #14142) (#14203) Top

    sinchai4547



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    sinchai4547 posted @ 2014-01-27 2:09 PM

    Nice Puzzle, thanks for the test

    PS. I am very blur in one puzzle (Irregular), I answer row A same row B. TT
    Can I claim this puzzle?
    @ 2014-01-27 3:05 PM (#14204 - in reply to #14142) (#14204) Top

    David McNeill



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    David McNeill posted @ 2014-01-27 3:05 PM

    Are there 2 solutions to the Symbols puzzle? Didn't affect the answer codes but I had deduced there were going to be at least 2 solutions from early on and thought I must have made a mistake.

    I started at the end of the puzzle set because that's the way my printer is set up. Those last two puzzles were really tough - especially the Arrows.
    @ 2014-01-27 3:27 PM (#14205 - in reply to #14204) (#14205) Top

    TiiT



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    TiiT posted @ 2014-01-27 3:27 PM

    David McNeill - 2014-01-28 12:05 PM

    Are there 2 solutions to the Symbols puzzle? Didn't affect the answer codes but I had deduced there were going to be at least 2 solutions from early on and thought I must have made a mistake.

    I started at the end of the puzzle set because that's the way my printer is set up. Those last two puzzles were really tough - especially the Arrows.




    David, the rules are saying that Symbols outside the grid indicates the attributes of the first two numbers in that direction (odd/even, big/small or prime). If there's no symbol, the first two numbers don't share the corresponding attribute. I also had 46 and 64 in the first two rows in my solution but afterwards I figured out where is the problem by reading the rules. Although I'm not completely sure if my solution is correct.

    TiiT
    @ 2014-01-27 6:25 PM (#14207 - in reply to #14205) (#14207) Top

    Fred76




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    Fred76 posted @ 2014-01-27 6:25 PM

    TiiT - 2014-01-27 3:27 PM

    David McNeill - 2014-01-28 12:05 PM

    Are there 2 solutions to the Symbols puzzle? Didn't affect the answer codes but I had deduced there were going to be at least 2 solutions from early on and thought I must have made a mistake.

    I started at the end of the puzzle set because that's the way my printer is set up. Those last two puzzles were really tough - especially the Arrows.




    David, the rules are saying that Symbols outside the grid indicates the attributes of the first two numbers in that direction (odd/even, big/small or prime). If there's no symbol, the first two numbers don't share the corresponding attribute. I also had 46 and 64 in the first two rows in my solution but afterwards I figured out where is the problem by reading the rules. Although I'm not completely sure if my solution is correct.

    TiiT


    It has only one solution. Like Tiit said, you probably forgot the rule "If there's no symbol, the first two numbers don't share the corresponding attribute", it should have been harder to try to solve it without this rule, I remember I used it a few times during solving and, of course, at the end, too.

    Fred

    Edited by Fred76 2014-01-27 6:32 PM
    @ 2014-01-27 7:11 PM (#14208 - in reply to #14142) (#14208) Top

    greenhorn



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    greenhorn posted @ 2014-01-27 7:11 PM

    I am very disappointed about the puzzle booklets and their layout. I prefer 2 grids per page, so I opened the document with 9 pages. But the grids were toooooo small. Nevertheless I printed it out and start solving. In the puzzles like Latin Square, Killer, Sudoku and Dragons I-II there were no space to write digits not even pencilmarks. So I needed to print also some pages from the bigger document. Then revealed another problem - the logo (pretty nice logo by the way) waste out all my printing color.
    On the other hand, I enjoy solving the sudokus. Those under 60 points vere absolutely easy and the rest was very pretty solvable. My tactic was to skip the Symbols and solve the rest, but I made stupid counting mistake at Arrows and solved them twice, that is why I missed reltively easy Brickdoku and Skyscrapers.

    Edited by greenhorn 2014-01-27 7:15 PM
    @ 2014-01-27 9:40 PM (#14210 - in reply to #14142) (#14210) Top

    Yuhei Kusui



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    Yuhei Kusui posted @ 2014-01-27 9:40 PM

     How balanced do you think the puzzle types of this test were? Perfectly balanced
     What was your opinion of the distribution of easy/hard puzzles? Just right
     What did you think about the puzzle quality of the test? Very nice
     How did you feel about the length / time limit for this test? Just right
     Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? Many puzzles were worth too much or too little
     What was your opinion of the booklet formatting and printing? Just right


    @ 2014-01-27 10:43 PM (#14213 - in reply to #14203) (#14213) Top

    sinchai4547



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    sinchai4547 posted @ 2014-01-27 10:43 PM

    sinchai4547 - 2014-01-27 2:09 PMNice Puzzle, thanks for the testPS. I am very blur in one puzzle (Irregular), I answer row A same row B. TTCan I claim this puzzle?
    I found my mistake

    Edited by sinchai4547 2014-01-27 10:45 PM
    @ 2014-01-28 4:47 AM (#14216 - in reply to #14142) (#14216) Top

    Administrator



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    Administrator posted @ 2014-01-28 4:47 AM

    Request players not to post (screenshots of) results before the contest is over. It gives, however slight, advantage to players who haven't solved yet.