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PR 2020 (MII and Regions) Author
Posts: 55
Location: India | Very nice contest Rakesh. I loved the path for each Sudoku i solved. I never looked at the IB and never realized about the Constant AP. Wasted a lot of time (more than 20 min) and at last realized that it should be broken????.
After the contest saw the IB.
Great test though.. |
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Posts: 59
Location: United States | Way, way, way too hard for a timed test in my opinion...but the few I solved seemed like nice puzzles. I try to avoid trial and error when possible but barely got started. Regular killer took almost 40 minutes. Fumbled with kropki about 15 minutes, got nowhere. Couldn't even begin little killer. Lost interest, walked away and made a cup of coffee...I'll save the rest for a rainy Saturday sometime. |
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Posts: 3
Location: Canada | It appears to me that there are 2 solutions to 09 Odd Even Count using the digits 1, 2, 3, 5, 7, 9. The corner circles are 3s and the interior circles are 7s. The two solutions would arise by swapping the 1s and 2s in columns three and six.
Have I missed something here? |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1807
  
Location: India | romanm44 - 2020-05-10 12:41 AM
It appears to me that there are 2 solutions to 09 Odd Even Count using the digits 1, 2, 3, 5, 7, 9. The corner circles are 3s and the interior circles are 7s. The two solutions would arise by swapping the 1s and 2s in columns three and six.
Have I missed something here?
You may be missing the rule that all circles are marked, meaning that no digit can follow the count properties if it isn't in a circle. |
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Location: Canada | Thanks Prasanna! I had forgotten thank requirement. That eliminates one of the solutions. |
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Posts: 139
Location: Estonia | I think it's a very cool competition. I really enjoyed ! But I also agree this guessing part many have mentioned here before me. |
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Posts: 225
Location: Thailand | Thanks for a nice change from the PRs and SMs, Rakesh.
I didn't pay attention to the IB's Sequences example and lost some time to figure out +0 is a valid arithmetic progression.
You could see a lot of clever intended paths - showing how meticulously these were made.
Unfortunately, as Byron noted, the 6x6 nature made this test prone to guessing for one to solve as many grids as possible in the 90 minutes.
Good fun nonetheless. Thanks again! |
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Mean Minis (2020) Author
Posts: 774
Location: India | ByronosaurusRex - 2020-05-09 5:33 AM
...I should mention that Sequence felt particularly overvalued -- I skipped past it at first because I thought I was a bit short on time to risk it, then came back later and quickly steamrolled through the full solution path in just over 3 minutes. Its difficulty is almost entirely contained in the "same digit repeated is an arithmetic progression" a-ha moment, which feels like the puzzling equivalent of a trick question; to its credit, the puzzle made eliminating all other options for that line incredibly efficient, so it was probably the best possible execution of that trick, but 9 points still felt like too great a reward for spotting it so quickly. For every high-pointer, there would be some participants who do it in a quicker than expected time. For sequence, based on the observations so far, participants have indeed taken some time before realizing that 3-3-3-3 sequence as a possibility. Since 1 and 2 are not possible on the longer line, 3456 seems a more natural sequence everyone would go for, and then reach a contradiction. I agree it is not a complex deduction but still takes time somewhere. |
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Location: India | Password is sent by mail? |
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SM 2020 (Math) Author
Posts: 419
Location: India | Thanks for a wonderful contest Rakesh .Monthly contests are a rarity nowadays and it was a pleasant sight to see a sudoku contest aside from the routine of SM & PRs. This contest made me reminescent of ISC 2016?! wherein Round 4 (authored by Deb)had 6x6 sudokus with unknown list of digits in which I scored 43 and you 133 (if I am not wrong and my memory is good.I am unable to get the result list for the same to verify) and you edged ahead of me to podium.
I would be curious to know your inspiration for writing this test and whether you got the idea by the above mentioned round.About the contest itself, the sudokus were definitely on the harder side and will be extremely fun to solve as one-offs without contest time constraints or pressure. In the contest, I had to guess on most but I did find logic in a few and they were very interesting. Thanks again ! Hope we get to see more monthly contests in LMI ! |
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Location: India | danielbabu - 2020-05-13 3:01 PM
Password is sent by mail?
It is displayed on the screen once you start the contest. It seems you already took the test. So you would be knowing this already. |
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Posts: 17
Location: India | Very interesting set of puzzles. It was certainly very challenging trying to find out the digits by solving , but made it more fun too. i wish I was less sleepy and had a printer since I took time solving online. Thanks for a very innovative contest. |
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Posts: 74
Location: United States | Those puzzles were really hard, but very fun! I wish I had had more time, but I enjoyed solving what I could in the time allotted. Thanks very much Rakesh! |
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SM 2020 (Converse and Odd Even) Author
Posts: 87
Location: India | Thanks Rakesh for Mean Minis! They were a wonderful set of moderate to hard puzzles with very interesting solving paths. Thoroughly enjoyed. |
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Location: India | The Solution Booklet is now available here. |
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Mean Minis (2020) Author
Posts: 774
Location: India | Congratulations to Nikola Zivanovic for winning this contest by a mile. Congratulations to Endo Ken, Prasanna Seshadri, Tiit Vunk, Salih Alan and Tantan Dai for completing all 18 grids inside 70 minutes. In fact, all 15 finishers did very well. Amongst competitors from India, Good performances by Kishore, Pranav, Harmeet and Kartik.
Thanks Rob, Byron, Ashish, Bob, Tiit, Tawan, Kishore, Anu G, Michael and Harmeet for sharing feedback on the test! Also, thanks to all the 246 participants for trying out this test.
The concept of the test was indeed taken from one of the rounds in ISC 2016. I had liked this concept very much at that time.
I knew before the test that there could be a fair amount of guesswork in play - owing to the moderate/hard logic and 6x6 nature. That is one reason I increased the number of grids from (initially planned) 15 to 18. After having watched live streams of Puzzle GP and Sudoku GP finals in recent years, I can say that every contest involves some amount of guesswork. And, even when one says he/she guessed, I think it is a combinaton of x% logic and y% guess. And, as long as x is a decent number, it is fine. At the same time, I was not too worried about this aspect - specifically I did not think about things like "Can this one be resolved by guessing easily?" while creating the grids.
I am not surprised that Inequality Sudoku was solved the most. That would probably be a first for this type, as this is a not-so-popular variant in general. Little Killer and Odd Even Count had the least correct submissions. However, both fared exactly opposite of each other in terms of accuracy of submissions. Expectedly, there were many submission errors in Odd Even Count Sudoku due to the 12-21 twist in the end. No one made an error in LK submission. In the test, I would have liked to include mini classic sudoku and more common variants like diagonal, palindrome, extra region, etc. But they would have needed all six digits to be provided, so they were excluded.
Based on the comments, there may be a second edition of Mean Minis coming soon - with a different set of 18 variants. |
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Typed Logic Author
Posts: 21
Location: United States | I wasn't able to find time to attempt this during the contest, but I've worked through the full set on my own time since. I usually sit out on sudoku contests, but the theme here piqued my interest enough and I'm very glad I solved these. My favorite paths were the Little Killer and X Sums, though I also loved placing all copies of an unknown digit in the Kropki, twice, before deducing the digit set.
Wonderful puzzles across the board though, thanks for creating them! |
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Posts: 18
Location: Canada | mstang - 2020-05-13 2:58 PM
Those puzzles were really hard, but very fun!
Same sentiment from me. Very interesting puzzles to solve! Some took me a reallllly long time to solve though... |
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Mean Minis (2020) Author
Posts: 774
Location: India | Thanks Jeffrey and SS! |
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Posts: 4
Location: South Korea | The displayed password is incorrect.
What is PB password? |
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Posts: 4
Location: South Korea | sorry.
i made a typing mistake....... |
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WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent
Mean Minis - LMI May Monthly Sudoku Test - 8th to 13th May 2020
