Substitution2 - R7C5
Can 8(Eight) be placed in R7C5(O)?
Is this something like

O
O = 8 ???

Edited by Kwaka 2018-03-28 9:20 AM

There is an error in the example puzzle. You are right 8 cannot be placed in R7C5 if an O is given there.
For the given word mapping O can only be replaced by 1,2,4.

We will publish the corrected example in the corrected version of the IB.

Please explain what '2 odd 2 even' is. Not sure what is meant by '2 consecutive numbers of the same parity'
Thanks

Parity refers to Odd or Even numbers. There cannot be more than two consecutive Odd or two consecutive even numbers in any row or column in the Sudoku. Example, if the two neighboring numbers in a row or column are 1 and 3, then there must not be an odd number on either side of 1 3 as it will become three consecutive odd numbers.

The corrected version of the IB is now available.

There is a change in the substitution sudoku 2 example.

Is the word list for substitution sudoku in the contest same as that in IB ?

Sorry, this question is specifically directed at the actual puzzle which appears in the test and is not intended for better understanding of the rules, so we will not be able to answer it.

A lookback at past winners of SM contests with Odd Even variations:

The test has started now.

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
Which set of puzzles did you like the most?	Coded Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Coded Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	True or Lie Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	2 Even 2 Odd Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Classic Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

The "Which set of puzzles did you like the most?" box has "Odd even Bridge Frame Sudoku" instead of "Odd Even Bridge Sudoku".

Edited by An LMI player 2018-03-31 11:47 AM

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
Which set of puzzles did you like the most?	2 Even 2 Odd Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Substitution Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Great Test.Enjoyed it a lot.Ideally should have finished the test easily within time,but the Coded 9*9 sudoku turned out to be a total Nightmare .
:(
Thank you to the authors for a really interesting set of sudokus.

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
Which set of puzzles did you like the most?	2 Even 2 Odd Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Good set of sudokus .Very disappointed again that I coudn't complete but I can take positive from the fact that I was very close to finishing.Was about to enter the solution for 5 pointer classic when the timer ran out.So just had the 1 pointers left unsolved and the 5 which I couldn't submit.Coded was the hardest.Favourites are 2 even 2 odd(8) followed by True or Lie (7).Thanks a lot Kumaresan and Amit for the fun test .

Excellent puzzles, enjoyed the test!

What was your opinion of the distribution of easy/hard puzzles?	Too many hard puzzles
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	All Odd All Even Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

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Thanks for clarifying

I logged on to one laptop and started solving online.Since my internet conked, i switched to another machine, but I am not able to submit my answers. How do I handle this

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
Which set of puzzles did you like the most?	Substitution Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Nice set of sudokus. Came really close to finishing the set, but just couldn't finish the Coded.

What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Fairly Nice
Which set of puzzles did you like the most?	Coded Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Odd Even Bridge sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Odd Even Bridge sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Wow. My best Sudoku Round ever I guess. And even surprising after seeing results. The day when just everything clicks and no mistakes.
I struggled in Coded Sudoku, I just kept guessing and eliminated possibilities quickly. Apart from that, every other sudoku was smooth solve.
Wonderful Test.
I still can't believe my score.
Thanks to Authors and LMI.

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
Which set of puzzles did you like the most?	Coded Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	2 Even 2 Odd Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

I really liked the set. Good job by Amit and Kumaresan. Althogh i broke 2 odd 2 even twice ( got it correct in the third attempt ) , that was my favourite. I couldnt solve odd evn bridge 6x6 during the test , but later i solved it . It had great logic . Interstingly , this was one of those rare tests where i didnt make any errors while submission. Thanks Amit and Kumaresan for the lovely set

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
Which set of puzzles did you like the most?	Coded Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

This was one hell of a test! My congrats to the authors for creating this beautiful set. The substitution puzzles were my favourites. Somply amazing and it was a pleasure solving them.

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
Which set of puzzles did you like the most?	True or Lie Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Nice puzzles!

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
Which set of puzzles did you like the most?	Coded Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	True or Lie Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Fairly Nice
Which set of puzzles did you like the most?	True or Lie Sudoku
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 distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Fairly Nice
Which set of puzzles did you like the most?	True or Lie Sudoku

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
Which set of puzzles did you like the most?	Coded Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

Kudos to authors for the wonderful set. Enjoyed it and loved the construction !!

Congratulations to Takuya Sugimoto, Kota Morinishi and Jakub Ondrousek for taking the top 3 places. They were separated by 44 seconds.

Amongst Indian participants, Congratulations to Rishi Puri, Rohan Rao and Ashish Kumar for taking the top 3 places.

Of the 271 participants, 105 were from India. Rachit Kabra (India) was the first to start the test while David Cohen (USA) was the last person to start the test. 36 participants completed the set within the allotted time. The median score of the test was 50.

Thanks R Kumaresan and Amit Sowani for the puzzles!

Participants may share feedback on the results page and rate the puzzles on the contest page.

Solution Booklet is available now.

Thanks everyone for the very encouraging feedback.

I think Kumaresan deserves all the credit as he set the tone for this test with a large number of submissions in a very short span of time.
This is the first test that he has authored and I could see the quality of sudokus improving with each submission that he made, so we can expect a lot more from him in the coming years.

Apart from the classics he took up all the variants on the Odd/Even side right from identifying the variants to constructing them beautifully. Odd Even theme has been done several times so we selected 2 variants which were introduced in Indian WSCs, All Odd All Even in WSC 2008 and Odd Even Bridge in WSC2017. I was not familiar with 2 Even 2 Odd, but I think it does a lot of justice to the theme and it offers a lot of possibilities.

For Substitution there are a lot of types like Pips, Roman, Digital, etc. which eventually convert into pencil marks sudoku. To introduce some variety we included Coded and True/Lie along with Substitution sudoku.
Coded Sudoku was the toughest of the round and Rakesh had indicated that in his feedback, but we persisted with this version as the deduction required at the sticking point is very similar to that required in classic sudoku solving.

Thanks Rakesh and Prasanna for your test solves and helping with the points distribution to reflect the puzzle difficulties.

Thanks to everyone for participating. I hope you enjoyed this set of sudokus.

Thanks to every one. First, I want to say one thing. The output from me is due to ignite by Prasanna, encouragement by Rakesh and fine tuning by Amit. I learned lot from this while working with Amit. Secondly, as Amit said I will surely contribute with improved puzzles in coming years. Finally, Thanks to LMI for giving me an opportunity to co-author an episode.

What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Fairly Nice
Which set of puzzles did you like the most?	Coded Sudoku
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount

How to I get password for this sudoku booklet for practising purposes.