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Announcing "LMI Beginners' Sudoku Contests"363 posts • Page 7 of 15 • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
@ 2012-11-16 10:29 PM (#8969 - in reply to #7911) (#8969) Top

debmohanty




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debmohanty posted @ 2012-11-16 10:29 PM

Thanks Fred for writing the Beginners contest. It certainly helps me a lot, when I don't have to write 8 sudokus every month

With a highest score of 110.65 (compared to 126 in Sep / 118 in Oct), this contest was certainly more difficult even for top solvers. Some of the puzzles were time-consuming to fill so many digits (Outside / Consecutive), if not very difficult. The result was not completely surprising, in fact Fred and me were mostly expecting it. At some point before the test, Prasanna even had suggested increasing time limit.

Anyway, the point I'm trying to make is that beginners shouldn't get demotivated if they scored less in this test compared to previous ones.


Edited by debmohanty 2012-11-16 10:40 PM
@ 2012-11-17 2:59 AM (#8970 - in reply to #7911) (#8970) Top

Fred76




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Fred76 posted @ 2012-11-17 2:59 AM

Just a few words about the puzzles:

Classics: Not lot of things to say. 4th sudoku was the hardest, with a naked single in R8C2. Once this found, it doesn't require hard step, but the logical path is narrow, so it explains surely that some players spent some time on this one.
I hope that you have seen what I tried to do aesthetically on these grids.

Variants: I was asked by Deb and Prasanna to create a 7*7 toroidal, a consecutive sudoku, an outside sudoku and a killer sudoku. After test solving the set, we found that it was a bit too difficult compared to previous tests, especially killer sudoku. I could have created an easier one, but I don't find very exciting to create very easy killer sudoku. In my opinion, killer sudoku is not an easy variant, and even the easy ones, without hard logical step, take some time to be solved. So we decided that I create another variant: It seemed more appropriate to create an easy antiknight sudoku.

Toroidal sudoku: Most of the time, I like to create toroidal sudoku with the same shape for all regions. This is perhaps because it's impossible with irregular sudoku that I find it interesting.
Outside sudoku: I feared that it could be hard to create something aesthetic for this one. In fact, that is the first outside sudoku I created. I didn't want to put digits inside the grid (otherwise, why name it outside sudoku), and I didn't want to have too much digits outside the grid. I decided the 1-9 stuff for the upper side and right side,and tried to have no more than 2 digits for each row/column in the bottom and left sides. This construction has the effect that the end of the solving is the regions 2,3,5,6. The hardest steps here were two pairs (13 in region 2 and 89 in region 6), that make the puzzle rather medium than easy. (The players that took part in the last WSC know that it's possible to create hard outside sudokus !)
Consecutive sudoku: I chosed the theme being my name's initials: FS. I constructed the puzzle trying to have these letters clearly visible, so trying to have the least possible of consecutive digits outside of the digits making the letters. I tried to "push" the consecutive digits in the regions 3 and 7, where I also placed the digits.
The puzzle doesn't need some hard step to be solved, but it is also, as the outside sudoku, more a medium one than an easy one.

Finally the antiknight sudoku. I think it is not hard, but requires lot of placement using the antiknight rule. The hardest step was to find the pair 25 in region 2 due to the antiknight placement for the 5.

I hope every player have fun, especially those who spent lot of time (spending lot of time without having fun is not an ideal entertainment) !

Fred
@ 2012-11-17 10:37 AM (#8974 - in reply to #8970) (#8974) Top

Richard



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Richard posted @ 2012-11-17 10:37 AM

Reading you would be the author of a beginners contest, I already thought it would be harder than average. I thought the same during solving. I was very much aware of the ability for naked singles, so I didn't find the 4th sudoku harder than the others.

For the variants, I can confirm some bottlenecks you described; the pair 13 in box 2 in the outside sudoku was hard to spot. This one certainly took most time. The consecutive was not that hard. The long series in column 7 provided much info, and the absence of a lot of bars means you often have to place two consecutive digits with one cell in between.
I have almost no experience in solving anti knights. For your test I practised a few, and learned some typical tricks, most of them being elimination steps. That helped, and I found the pair 25 pretty soon.

I had a lot of fun with the puzzles. Also afterwards, when I noticed my relative good scoring. But during the test the same feelings crossed my mind as Deb wrote above.

Anyway: thanks for the test!
@ 2012-12-03 5:09 PM (#9056 - in reply to #7911) (#9056) Top

Administrator



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Administrator posted @ 2012-12-03 5:09 PM

December Beginners' Sudoku Contest

Types

Here are the types for the December Edition of LMI Beginners' Contest - http://logicmastersindia.com/BeginnersSudoku/types/?test=B201212

We are continuing with 2 variants from last time (Outside and No Knight Step)
We are introducing 2 new variants (UnTouch and Killer)

Dates

The contest will start on the 13th of December and run till the 19th, including both dates.

Author

All 8 Sudokus for December are written by detuned (Tom Collyer). To know more about Tom and to get a Nikoli puzzle every Friday, checkout Tom's blog detuned radio.

@ 2012-12-06 4:02 AM (#9075 - in reply to #7911) (#9075) Top

detuned



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detuned posted @ 2012-12-06 4:02 AM

I certainly have a tough act to follow in Fred, but I've tried my best to put together a nice set. I don't think it will be quite as challenging in difficulty as November! I suppose if you look at my blog you'll see I haven't posted sudoku variants for quite a while, so it was lots of fun putting some sudoku together for a change. Hopefully you'll see that when you get to solve the puzzles :)
@ 2012-12-08 4:15 AM (#9084 - in reply to #9075) (#9084) Top

distri




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distri posted @ 2012-12-08 4:15 AM

detuned - 2012-12-06 4:02 AM

I certainly have a tough act to follow in Fred


As everyone knows , the grids of Fred shake the neurons .. ....Ah !Ah ! but we like our agitator of brain, of course !!!

detuned - 2012-12-06 4:02 AM
but I've tried my best to put together a nice set


That's very kind of you to prepare the grids for (the past) and next Edition of Lmi beginners.
Thanks to the authors , we make progress .
Thank you very much.


@ 2012-12-13 11:52 AM (#9108 - in reply to #7911) (#9108) Top

tamz29



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tamz29 posted @ 2012-12-13 11:52 AM

Nice clean sudokus, thanks for the puzzles Tom. :)
@ 2012-12-13 4:59 PM (#9111 - in reply to #7911) (#9111) Top

debmohanty




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debmohanty posted @ 2012-12-13 4:59 PM

---------
So 5 minutes 36 seconds is the time to beat.

Edited by debmohanty 2012-12-13 5:05 PM
@ 2012-12-13 7:51 PM (#9113 - in reply to #7911) (#9113) Top

Fred76




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Fred76 posted @ 2012-12-13 7:51 PM

Nice sudokus, Tom. Thanks !
@ 2012-12-13 8:17 PM (#9114 - in reply to #7911) (#9114) Top

detuned



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detuned posted @ 2012-12-13 8:17 PM

My pleasure. I hope everyone's neurons have been tickled, rather than shaken, so far :)
@ 2012-12-14 7:38 PM (#9127 - in reply to #7911) (#9127) Top

flk



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flk posted @ 2012-12-14 7:38 PM

Thanks for the puzzles
@ 2012-12-15 12:13 AM (#9128 - in reply to #7911) (#9128) Top

joshuazucker



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joshuazucker posted @ 2012-12-15 12:13 AM

Nice puzzles! I had a horrendously difficult time with the Outside until I noticed that I had failed to use one of the clues. The classics were all pretty nice puzzles, the no knight was rather clever, and the killer was really beautiful but I think pretty difficult for a beginner contest! It took a while to see how to make use of the layout most effectively.
@ 2012-12-16 4:01 PM (#9134 - in reply to #7911) (#9134) Top

distri




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distri posted @ 2012-12-16 4:01 PM

In first , the possibility of playing online is really comfortable with the zoom , I see as well as a mole !!!
Thank you Deb .
I thought that I had no chance I never play untouch , anti knight and killer , but the grids were very nice , not easy but not too difficult .(I confirm tickles only...Ah!Ah!)
unfortunately about the killer (I confirm more that tickles in spite of 15 in the middle) ..... I close my mouth because I played as a smurfette , to the right ...to the left ....etc but never at the right place !!!!! result.....far too many time .
The classics were great especially the third and the fourth .
Thank you Tom

Edited by distri 2012-12-16 4:23 PM
@ 2012-12-18 7:07 PM (#9150 - in reply to #7911) (#9150) Top

edderiofer




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edderiofer posted @ 2012-12-18 7:07 PM

All of the puzzles were very nice, though I broke the Killer a couple of times, gave up, came back the next day, and solved it. Also, I spent a few minutes staring at a nearly-completed AntiKnight puzzle before realizing that I had forgotten to use the 2 in the bottom-centre grid.
@ 2012-12-20 5:38 AM (#9152 - in reply to #7911) (#9152) Top

Administrator



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Administrator posted @ 2012-12-20 5:38 AM

December Beginners' Contest is over now. Passwords removed from booklets.
@ 2012-12-20 2:59 PM (#9158 - in reply to #7911) (#9158) Top

Administrator



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Administrator posted @ 2012-12-20 2:59 PM

adityasaraf007 and khuski move to seasoners after Decembers contest.
@ 2012-12-20 7:42 PM (#9160 - in reply to #7911) (#9160) Top

detuned



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detuned posted @ 2012-12-20 7:42 PM

I guess I'll had some of my own thoughts, as Fred did last month.

Classics: in general I quite like writing easy classics as you can really put a lot of thought into the design. With puzzle #1 I was hoping to get the digits 1-8, rather than 2-9 around the edge of the puzzle, but sometimes it doesn't quite work out like that. #2 featured some diagonal stripes - and this meant there were very few opportunities to put singles into the puzzle. Instead it was more profitable to solve by focussing on one or two digits at a time. This was supposed to be true of #3 as well, but it turned out even easier than that. I was astonished to see several sub-minute solves, with some as quick as 40 seconds! #4 was supposed to be a little trickier, and is based upon a favourite design of mine. I've used it in tests before, and as perhaps die hard fans of my blog will tell you, is (almost) the pattern I used for my first ever puzzle!

Variants: sometimes you just throw down a design and see where it gets you. With the added constraints that a variant can give, you often have a puzzle that needs very little tweaking. You can clearly see this is what I was after with the untouch puzzle. I was hoping not to need those digits in the 5th column, but didn't quite manage it. The killer was my favourite of the lot. Actually I was a little dopey when initially sketching out the cages and left blank spaces at R1C5, R5C1, R5C9 and R9C1. When I came to extend the cages that now contain those cells, I found that the puzzle still solved perfectly well. A pet hate of mine with killers is where you have to do too much adding up. I guess you have to do a bit to get yourself started here with the "cross" in the middle, but I much prefer to rely on logic that involves restricting a cage to a potential set of numbers and then using them as mini extra regions. So once you worked out how the L shaped 16 and 17 cages in the middle interacted, you were well on your way to solving. I suppose the outside was probably my least favourite of the set. I can't say I'm totally in love with this variant, but I tried to give a good clean solve and leave things well presented. The unfortunate thing with this sort of variant is that often you can miss the significance of one particular clue and be left scratching you head for a while until you come to re-examine it. Finally the anti-knight. I initially tried a design very similar to the untouch, but couldn't get it to work. In a fit of desperation (it was getting quite late that evening and i wanted to finish everything off), I had a look at Fred's completed grid from last month, permuted the digits and gave it a rotation, and then sketched out a striking design which I thought would solve uniquely. Without too much tweaking I got what I wanted. There are lots of subtle interactions with the antiknight logic for certain cells in the grid, and so if you knew what you were looking for the solve was fairly straightforward.

Anyhow, I hope everyone enjoyed the puzzles, congratulations to the winners, and my thanks to LMI for giving me the opportunity to showcase some of my puzzles :)

Tom
@ 2012-12-20 8:02 PM (#9161 - in reply to #7911) (#9161) Top

prasanna16391



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prasanna16391 posted @ 2012-12-20 8:02 PM

Thanks Tom for providing a nice set to solve. The detailed post about creating the grids is really interesting and useful too.

Anyway, the top 3 Beginners are zbych (Poland), DavidCollison (UK) and elena_tens (Greece). dp_94 had the best Indian performance among the Beginners.

Among Seasoners, no one got close to the fairly early "time to beat" set by jaku111 (Czech Republic). Timothy (France) and Gotroch (Czech Republic) are the "best of the rest" with 2nd and 3rd place respectively.

Congrats to all the winners, and thank you all for participating. :)
@ 2013-01-08 10:50 AM (#9378 - in reply to #9161) (#9378) Top

Administrator



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Administrator posted @ 2013-01-08 10:50 AM

January Beginners' Sudoku Contest

Types

Here are the types for the January Edition of LMI Beginners' Contest - http://logicmastersindia.com/BeginnersSudoku/types/?test=B201301

We are continuing with 2 variants from last time (UnTouch and Killer)
We are introducing 1 new variant (Sudoku XV)
Now that we have been running Beginners for 6 months, we have decided to start revisiting an old variant every month. It will be Irregular Sudoku this time.

Dates

Will be announced soon.

Author

All 8 Sudokus for January are written by Richard Stolk. Read more about Richard at our authors page, and don't forget to check out his recently concluded Advent Calendar 2012.

@ 2013-01-16 2:08 PM (#9501 - in reply to #9378) (#9501) Top

prasanna16391



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prasanna16391 posted @ 2013-01-16 2:08 PM

Update

Dates

The contest will start on the 18th of January and run till the 24th, including both dates.

@ 2013-01-18 1:23 PM (#9515 - in reply to #7911) (#9515) Top

xevs



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xevs posted @ 2013-01-18 1:23 PM

About Untouch Sudoku, can identical digits touch each other "diagonally"?
I can understand it's not allowed (by observing the Example), but I think some "beginner"s can't.
@ 2013-01-18 1:31 PM (#9516 - in reply to #9515) (#9516) Top

Richard



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Richard posted @ 2013-01-18 1:31 PM

xevs - 2013-01-18 1:23 PM

About Untouch Sudoku, can identical digits touch each other "diagonally"?
I can understand it's not allowed (by observing the Example), but I think some "beginner"s can't.


Yes, it's meant that they can't touch each other diagonally.
@ 2013-01-18 1:48 PM (#9517 - in reply to #9516) (#9517) Top

Administrator



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Administrator posted @ 2013-01-18 1:48 PM

Richard - 2013-01-18 1:31 PM

xevs - 2013-01-18 1:23 PM

About Untouch Sudoku, can identical digits touch each other "diagonally"?
I can understand it's not allowed (by observing the Example), but I think some "beginner"s can't.


Yes, it's meant that they can't touch each other diagonally.
Well ... "diagonally" is the only way identical digits can touch each other in a Sudoku

[ Added the missing word in link for types. It was already present in pdf. ]
@ 2013-01-19 3:36 PM (#9526 - in reply to #7911) (#9526) Top

rajeshk



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rajeshk posted @ 2013-01-19 3:36 PM

Heading of the contest page needs an update. It reads date in Dec.

@ 2013-01-19 6:30 PM (#9528 - in reply to #7911) (#9528) Top

TiiT



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TiiT posted @ 2013-01-19 6:30 PM

Why it doesn't let me to print variants??
Announcing "LMI Beginners' Sudoku Contests"363 posts • Page 7 of 15 • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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