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Location: India |
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Location: India | Logic Masters India announces October 2011 Sudoku Test — Sudoku A or B
Dates : 1st and 2nd October
Length : 120 minutes
IB and Submission Link : http://logicmastersindia.com/M201110S/
Author : Deb Mohanty
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Posts: 148
Location: France | This looks wonderful. I can't wait to try the puzzles of the IB... but I will have to, since USSC is about to start. Damn !  |
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Diagonal Vision Author
Posts: 337
Location: Switzerland | Ours brun - 2011-09-24 10:18 PM
This looks wonderful. I can't wait to try the puzzles of the IB... but I will have to, since USSC is about to start. Damn !
ditto |
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Posts: 328
Location: India | looks wonderful and challenging!!!
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Location: India | There are 12 examples, but around 20 rules. So, there are some 'unused' rules in the IB.
Here are some links which can used for practice. Most of the Sudokus have appeared in LMI tests earlier.
Rohan's blog has examples for many of them as well. If someone wants online solving, check argio-logic.net
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Location: India | Point changes for XV/Kropki, Consecutive/Fiver - Updated IB uploaded. |
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SM 2020 (Math) Author
Posts: 157
Location: India | JUST WANTED TO KNOW WHETHER WE CAN APPLY UNIQUENESS TEST FOR THE PUZZLES. IN THE 3RD EXAMPLE OF EVEN/SMALL NEIGHBOUR I CAME ACROSS SUCH SITUATION IN CELLS R2C1 R2C2 , R4C1 R4C2. I WASNT SURE WHETHER THE UNIQUENESS PRINCIPLE COULD BE APPLIED OR NOT. LATER AFTER SOLVING I FELT THAT IT COULD HAVE BEEN APPLIED. PLEASE CLARIFY
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Posts: 148
Location: France | The general rule about uniqueness and variants is that you can apply it as long as no cell amongst the ones you are dealing with can be affected by the additional rule(s) of this variant. I can't say more about this particular puzzle but I advise you to be very careful when applying unicity to variants. |
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Posts: 148
Location: France | Well, I just solved the puzzle but never got in the situation you describe, so I will just examine an hypothetical case. Let's say (all this happening before you determine which is the correct rule) you have R2C1/R2C2=39 and R4C1/R4C2=359. It is tempting to say that either R4C1 or R4C2 contains a 5, but it is a wrong assertion. Indeed, there is one cell (R2C1) which can be affected by the "small neighbours" rule, so you could perfectly have a unique rectangle 39/39/39/39. If it happens that the rule is the one of "small neighbours", then there cannot be a 9 in R2C1 and the unique rectangle is broken.
I hope I made it clear enough, I wrote this a bit in a hurry. |
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Location: India | Thanks Bastien for clarifying. Even I didn't catch the situation Akash is describing.
As-is, it is little dangerous to apply unique rectangle to variants. In this test with 2-rules, it is probably little early if you apply unique rectangle before 'determining' the correct rule.
@Akash, to specifically answer if you can apply uniqueness rule, all I can say is all sudokus are designed to have unique solutions :-)
One side note on examples : the difficulty of examples vary a lot, and has nothing to do with difficulty of actual puzzles
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Posts: 28
Location: Austria | With Sum10/Multiple, are all black marks given?
I.e., is it possible in Sum10 that two neighboring numbers sum up to 10 and have no black square between them?
Is it possible for Multiple Sudoku that two neighboring numbers are a multiple of each others but have no black square between them? |
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Location: India | euklid - 2011-09-25 10:39 PM
With Sum10/Multiple, are all black marks given?
I.e., is it possible in Sum10 that two neighboring numbers sum up to 10 and have no black square between them?
Is it possible for Multiple Sudoku that two neighboring numbers are a multiple of each others but have no black square between them?
All black marks are not given. So converse rule does not apply.
Edited by debmohanty 2011-09-25 11:44 PM
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SM 2020 (Math) Author
Posts: 157
Location: India | @deb and bastien. thanks a lot for clarifying my doubts. |
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Posts: 139
Location: Estonia | Is there a double solution in Greater/Lesser sudoku in Instruction Booklet? 7's & 8's in Box 6, 8 and 9. |
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SudoClones Author
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Location: France | TiiT - 2011-09-27 11:47 PM
Is there a double solution in Greater/Lesser sudoku in Instruction Booklet? 7's & 8's in Box 6, 8 and 9.
Not for me because of the 7 between L8C3 et L8C4. |
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Posts: 139
Location: Estonia | OH ok, now I understand the rules. I think. I got it wrong first. I should always read all the rules more carefully. |
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Location: India | All examples can now be solved online in the submission page ( http://logicmastersindia.com/M201110S/ ) |
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Location: India | While testing the sudokus, Rakesh asked me if it is allowed make 2 copies of the booklet. I didn't answer his question, but I think he printed only a single copy.
There is discussion in sudokuvariante forum that one of the strategy could be printing 2 copies, and solving using different rules on separate copies.
The reasons I'm bringing it up here is
1) I want to make sure that everyone knows that this is a strategy that some player might want to follow
2) More importantly, I feel, just like an offline competition where only one set of printout is allowed, one should use only one set of printout for this test.
3) Most importantly, without revealing much about what to expect in actual sudokus, I can say that printing two copies will not help one solving faster.
Edited by debmohanty 2011-09-28 7:54 PM
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Location: India | Announcements
1) Bonus pointsPlayers submitting all 12 correctly will get .9 points per minute
Players submitting all 12, but 1 incorrect with maximum 3 incorrect digits will get .6 points per minute saved.
As usual, bonus points will be computed from the time "Claim Bonus" is clicked.
So, click on "Claim Bonus" as soon as you think you are done.
2) Sudoku Booklet Password protected sudoku booklet is uploaded.
It has 6 pages. Each page has 2 sudokus. There is no cover page / points table.
3) Read the instruction booklet carefullyThere are more rules than a usual sudoku test has. So please read the IB carefully.
Converse rules doesn't apply to all Sudokus.
Please ask here in case of doubts
4) Score page |
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Diagonal Vision Author
Posts: 337
Location: Switzerland | debmohanty - 2011-09-28 7:53 PM
While testing the sudokus, Rakesh asked me if it is allowed make 2 copies of the booklet. I didn't answer his question, but I think he printed only a single copy.
There is discussion in sudokuvariante forum that one of the strategy could be printing 2 copies, and solving using different rules on separate copies.
The reasons I'm bringing it up here is
1) I want to make sure that everyone knows that this is a strategy that some player might want to follow
2) More importantly, I feel, just like an offline competition where only one set of printout is allowed, one should use only one set of printout for this test.
3) Most importantly, without revealing much about what to expect in actual sudokus, I can say that printing two copies will not help one solving faster.
I read this on Hideaki Jo's blog first. I'm not sure I understood well, because I'm not a specialist of japanese translation . I thought it was an interesting point, so I report this on my forum. Thanks for clarifying (and for reading sudokuvariante ) !
Fred |
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Location: India | Fred76 - 2011-10-01 6:42 AM
I thought it was an interesting point, so I report this on my forum. !
Precisely the same reason I posted in this forum :-) and my French is probably as good as your Japanese
Edited by debmohanty 2011-10-01 6:47 AM
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Location: India | Attention :
If you are solving online, you need not submit again using paper mode. It consumes time and error prone. |
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Posts: 199
Location: United States | Excellent puzzles. Thanks for the fun test! |
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Posts: 43
Location: United States | Deb - Really well done, nice set of puzzles. Enjoyed it! Cheers, Dave |
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A or B — LMI October Sudoku Test — 1st and 2nd October
