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Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb45 posts • Page 1 of 2 • 1 2
@ 2016-02-13 7:10 PM (#20982 - in reply to #20978) (#20982) Top

Administrator



20001000500202020
Country : India

Administrator posted @ 2016-02-13 7:10 PM

@ 2016-02-13 9:47 PM (#20983 - in reply to #20978) (#20983) Top

Para



Posts: 315
100100100
Country : The Netherlands

Para posted @ 2016-02-13 9:47 PM

You'd have thought that this test would have been held in March.
@ 2016-02-16 7:37 PM (#21016 - in reply to #20978) (#21016) Top

margareta456



Posts: 30
20
Country : Poland

margareta456 posted @ 2016-02-16 7:37 PM

will the result of Triplets & Triangles consider in LMI Sudoku Ratings?
@ 2016-02-16 7:38 PM (#21017 - in reply to #21016) (#21017) Top

Administrator



20001000500202020
Country : India

Administrator posted @ 2016-02-16 7:38 PM

margareta456 - 2016-02-16 7:37 PM

will the result of Triplets & Triangles consider in LMI Sudoku Ratings?
Yes.
@ 2016-02-17 7:46 PM (#21032 - in reply to #21017) (#21032) Top

kishy72



Posts: 419
100100100100
Country : India

kishy72 posted @ 2016-02-17 7:46 PM

Can someone tell me the logical start in Triangular sums example?I don't see much after putting in a few digits at the beginning....
@ 2016-02-17 8:37 PM (#21034 - in reply to #21032) (#21034) Top

rakesh_rai




Posts: 774
500100100202020
Country : India

rakesh_rai posted @ 2016-02-17 8:37 PM

kishy72 - 2016-02-17 7:46 PM

Can someone tell me the logical start in Triangular sums example?I don't see much after putting in a few digits at the beginning....
not sure if logical or not. But I was able to find the triangle for R2C3, and therefore for R2C4 and R3C3 and R3C4 too. And the numbers too. Then I got the triangle for R3C6 which gives all triangles except the four at bottom right. After this it should be easier, though I did not solve completely.
@ 2016-02-18 12:14 AM (#21037 - in reply to #21034) (#21037) Top

kishy72



Posts: 419
100100100100
Country : India

kishy72 posted @ 2016-02-18 12:14 AM

rakesh_rai - 2016-02-17 8:37 PM

kishy72 - 2016-02-17 7:46 PM

Can someone tell me the logical start in Triangular sums example?I don't see much after putting in a few digits at the beginning....
not sure if logical or not. But I was able to find the triangle for R2C3, and therefore for R2C4 and R3C3 and R3C4 too. And the numbers too. Then I got the triangle for R3C6 which gives all triangles except the four at bottom right. After this it should be easier, though I did not solve completely.


Was your approach to randomly put a triangle in a cell and see if it works out or contradicts?If that's the approach,I am looking for something else because I did the same and it was very tiring. To elaborate ,how did you find which cell in R2C3 contains the triangle in the first place?
@ 2016-02-18 8:35 AM (#21039 - in reply to #21037) (#21039) Top

rakesh_rai




Posts: 774
500100100202020
Country : India

rakesh_rai posted @ 2016-02-18 8:35 AM

kishy72 - 2016-02-18 12:14 AM

...how did you find which cell in R2C3 contains the triangle in the first place?
If there is a bottom/left triangle, it has 8 to the left. And the sum can be 15 or 21. In both cases R2C3 HAS to be 4. And then if you look at the triangle in R2C4 there is no way to make a perfect number. So the R2C3 has to have the upper/right triangle.
@ 2016-02-19 4:09 PM (#21045 - in reply to #20978) (#21045) Top

rajeshk




Posts: 542
5002020
Country : India

rajeshk posted @ 2016-02-19 4:09 PM

Checkout one Thropki Sudoku which I recently prepared for the practice of this test
http://www.funwithpuzzles.com/2016/02/thropki-sudoku.html
@ 2016-02-19 7:02 PM (#21047 - in reply to #20978) (#21047) Top

mihiryadav



Posts: 27
20
Country : India

mihiryadav posted @ 2016-02-19 7:02 PM

Can anyone tell me.....how a black triangle act as a symmetrical arrowhead and which arrowhead is pointing to the two digits?
@ 2016-02-19 7:23 PM (#21048 - in reply to #21047) (#21048) Top

David McNeill



Posts: 63
202020
Country : United Kingdom

David McNeill posted @ 2016-02-19 7:23 PM

It is the 90 degree corner of the triangle which acts as the point of the arrow (rather than either of the two 45 degree corners). Does this help?
@ 2016-02-19 7:32 PM (#21049 - in reply to #20978) (#21049) Top

Vishal



Posts: 22
20
Country : India

Vishal posted @ 2016-02-19 7:32 PM

In Max/Min Triplet Sums, I have identified the outside clue-whether max or min- but I am unable to figure out how to use this information as help in solving the Sudoku (apart from Classic rules) ? Please help..
@ 2016-02-19 7:39 PM (#21051 - in reply to #21048) (#21051) Top

mihiryadav



Posts: 27
20
Country : India

mihiryadav posted @ 2016-02-19 7:39 PM

Not able to figure out the two digits which is pointed by corresponding arrowhead.
@ 2016-02-19 8:31 PM (#21052 - in reply to #21049) (#21052) Top

David McNeill



Posts: 63
202020
Country : United Kingdom

David McNeill posted @ 2016-02-19 8:31 PM

Vishal,

Re: Max/Min Triplet Sums

I'm not very good at walkthroughs.

Try the following. Place two missing 8s by standard logic. Place 2s in boxes 6 and 7 by standard logic. Place 3 in box 8 by standard logic. Place 1 in box 3 by standard logic.

Now in row 4, the missing 1 cannot sit either side of the 3 and 2 (otherwise we would have a 6 sum in that row and we are told that 10 is the minimum sum) so it must go in column 2.

In the same row, the missing 5 must be either side of the 3 and 2 (otherwise we can't have a 10 sum). Therefore, column 3 in that row must have a 6.

In column 5, the 8 sum must be 1-3-4 in some order as the 2 is isolated. The 1 can't lie below the 3 as there would then be a 6 sum. So the 1 must go in row 5 and the 4 in row 6.

In box 4, the missing 3 can't go in bottom right corner as there would then be a 9 sum in row 6. So it goes immediately above that with the missing 4 to its left.

Then look at the 8 sum in column 3. etc.

Edited by David McNeill 2016-02-19 8:36 PM
@ 2016-02-19 8:42 PM (#21053 - in reply to #21051) (#21053) Top

David McNeill



Posts: 63
202020
Country : United Kingdom

David McNeill posted @ 2016-02-19 8:42 PM

Mihiryadav,

Re: Arrowhead

Consider the diagonally split cell in top right corner of box 5. The arrow cannot point to the south-east as the first digit in that direction is a 9 and the sum of the first two digits will therefore exceed the allowed value. So, the arrow must point to the north-west and the first two digits in this direction are 3 and 4, adding to 7. The top left triangle in our split cell is coloured black and a 7 is placed in the bottom right triangle.

Hope this gets you going.
@ 2016-02-20 1:40 AM (#21055 - in reply to #20978) (#21055) Top

margareta456



Posts: 30
20
Country : Poland

margareta456 posted @ 2016-02-20 1:40 AM

 How well did you like the theme of the contest? I really liked the theme
 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
 Your 3 most favorite puzzles of the contest. 12. Renban Squeeze
 Your 3 most favorite puzzles of the contest. 10. Tight Fit
 Your 3 most favorite puzzles of the contest. 11. Non-Consecutive Squeeze


@ 2016-02-20 2:33 AM (#21056 - in reply to #20978) (#21056) Top

Plucky



Posts: 8

Country : United Kingdom

Plucky posted @ 2016-02-20 2:33 AM

 How well did you like the theme of the contest? I somewhat liked the theme
 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
 Your 3 most favorite puzzles of the contest. 7. Max/Min Triplet Sums
 Your 3 most favorite puzzles of the contest. 13. Triangular Sums
 Your 3 most favorite puzzles of the contest. 4. Trio


This was a good test :) would have given it 3-stars if online solving was available - I don't have a printer so for puzzles without online solving I have to write all my answers in MSPaint with my mouse, which makes it take quite a bit longer and makes it difficult to write pencil marks.
@ 2016-02-20 2:53 PM (#21058 - in reply to #21052) (#21058) Top

Vishal



Posts: 22
20
Country : India

Vishal posted @ 2016-02-20 2:53 PM

Thanks David for your help and guiding me through the solving technique.. By the way, I failed to understand the rule - it was for all the combinations of consecutive numbers along a row and column; not only for the first 3...Thanks for your explanation..
@ 2016-02-20 4:30 PM (#21059 - in reply to #20978) (#21059) Top

deu



Posts: 69
202020
Country : Japan

deu posted @ 2016-02-20 4:30 PM

 How well did you like the theme of the contest? I really liked the theme
 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
 Your 3 most favorite puzzles of the contest. 6. Outside Sums
 Your 3 most favorite puzzles of the contest. 7. Max/Min Triplet Sums
 Your 3 most favorite puzzles of the contest. 12. Renban Squeeze


@ 2016-02-20 5:47 PM (#21060 - in reply to #20978) (#21060) Top

gaurav.kjain



Posts: 52
2020
Country : India

gaurav.kjain posted @ 2016-02-20 5:47 PM

 How well did you like the theme of the contest? I somewhat liked the theme
 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
 Your 3 most favorite puzzles of the contest. 9. Thropki
 Your 3 most favorite puzzles of the contest. 14. Arrowhead
 Your 3 most favorite puzzles of the contest. 10. Tight Fit


@ 2016-02-20 8:02 PM (#21061 - in reply to #20978) (#21061) Top

kishy72



Posts: 419
100100100100
Country : India

kishy72 posted @ 2016-02-20 8:02 PM

 How well did you like the theme of the contest? I somewhat liked the theme
 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
 Your 3 most favorite puzzles of the contest. 6. Outside Sums
 Your 3 most favorite puzzles of the contest. 13. Triangular Sums
 Your 3 most favorite puzzles of the contest. 9. Thropki


I really liked this test.Normally,I hate Math based variants in sudoku but this test was different.I remember thinking before the test that I would be happy with a score somewhere around 400.I didn't expect 470 in 90 mins(74?!).In the last 16 mins of the test,I really had a go at Thropki(100) but it seemed beyond my reach despite multiple guesses.

I greatly enjoyed solving Outside and Triangular sums both of which had a very systematic solve and I also loved the squeeze variants.

Thanks a lot to David for this wonderful test and to all test solvers. The set was delightful and I had great fun!
@ 2016-02-20 8:14 PM (#21062 - in reply to #21061) (#21062) Top

bskbri



Posts: 34
20
Country : Turkey

bskbri posted @ 2016-02-20 8:14 PM

I have two questions on triangular sums:
1. Are we sure that we won't split any more cells? I am confused because the rule says triangles cannot touch grid boundary. These already placed ones are far enough not to touch :)
2. May the three numbers around a triangle be same?
@ 2016-02-20 8:25 PM (#21063 - in reply to #21062) (#21063) Top

David McNeill



Posts: 63
202020
Country : United Kingdom

David McNeill posted @ 2016-02-20 8:25 PM

Bskbri,

Re: Triangular Sums

All split cells will be indicated before solving.

There is no special rule prohibiting more than one edge of a triangle having the same digit.
@ 2016-02-20 9:00 PM (#21064 - in reply to #20978) (#21064) Top

An LMI player



An LMI player posted @ 2016-02-20 9:00 PM

 How well did you like the theme of the contest? I really liked the theme
 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
 Your 3 most favorite puzzles of the contest. 10. Tight Fit
 Your 3 most favorite puzzles of the contest. 3. Classic
 Your 3 most favorite puzzles of the contest. 6. Outside Sums


@ 2016-02-20 9:01 PM (#21065 - in reply to #20978) (#21065) Top

misko



Posts: 11

Country : Germany

misko posted @ 2016-02-20 9:01 PM

 How well did you like the theme of the contest? I somewhat liked the theme
 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
 Your 3 most favorite puzzles of the contest. 14. Arrowhead
 Your 3 most favorite puzzles of the contest. 8. Thropki
 Your 3 most favorite puzzles of the contest. 9. Thropki


Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb45 posts • Page 1 of 2 • 1 2
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