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Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb
   LMI Tests -> Monthly Sudoku and Puzzle Tests45 posts • Page 1 of 2 • 1 2
Administrator
Subject: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-13 6:34 AM (#20978) (#20978) Top


200010010020

Logic Masters India announces February Sudoku Test — Triplets & Triangles

Dates : 20th - 22nd Feb

Instruction Booklet & Submission : Link

Author : David McNeill

Administrator
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-13 7:10 PM (#20982 - in reply to #20978) (#20982) Top


200010010020
Instructions booklet published.
Para
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-13 9:47 PM (#20983 - in reply to #20978) (#20983) Top




Posts: 297
10010020202020
Location: The Netherlands
You'd have thought that this test would have been held in March.
margareta456
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-16 7:37 PM (#21016 - in reply to #20978) (#21016) Top




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Location: Poland
will the result of Triplets & Triangles consider in LMI Sudoku Ratings?
Administrator
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-16 7:38 PM (#21017 - in reply to #21016) (#21017) Top


200010010020
margareta456 - 2016-02-16 7:37 PM

will the result of Triplets & Triangles consider in LMI Sudoku Ratings?
Yes.
kishy72
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-17 7:46 PM (#21032 - in reply to #21017) (#21032) Top




Posts: 306
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Location: india
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....
rakesh_rai
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-17 8:37 PM (#21034 - in reply to #21032) (#21034) Top



Support Administrator, Converse Variations (SM 15/16) Author

Posts: 665
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Location: India
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.
kishy72
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-18 12:14 AM (#21037 - in reply to #21034) (#21037) Top




Posts: 306
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Location: india
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?
rakesh_rai
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-18 8:35 AM (#21039 - in reply to #21037) (#21039) Top



Support Administrator, Converse Variations (SM 15/16) Author

Posts: 665
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Location: India
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.
rajeshk
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 4:09 PM (#21045 - in reply to #20978) (#21045) Top


WSPC Organizer

Posts: 479
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Location: India
Checkout one Thropki Sudoku which I recently prepared for the practice of this test
http://www.funwithpuzzles.com/2016/02/thropki-sudoku.html
mihiryadav
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 7:02 PM (#21047 - in reply to #20978) (#21047) Top




Posts: 27
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Location: INDIA
Can anyone tell me.....how a black triangle act as a symmetrical arrowhead and which arrowhead is pointing to the two digits?
David McNeill
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 7:23 PM (#21048 - in reply to #21047) (#21048) Top


Triplets & Triangles Author

Posts: 55
2020
Location: United Kingdom
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?
Vishal
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 7:32 PM (#21049 - in reply to #20978) (#21049) Top




Posts: 21
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Location: India
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..
mihiryadav
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 7:39 PM (#21051 - in reply to #21048) (#21051) Top




Posts: 27
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Location: INDIA
Not able to figure out the two digits which is pointed by corresponding arrowhead.
David McNeill
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 8:31 PM (#21052 - in reply to #21049) (#21052) Top


Triplets & Triangles Author

Posts: 55
2020
Location: United Kingdom
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
David McNeill
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-19 8:42 PM (#21053 - in reply to #21051) (#21053) Top


Triplets & Triangles Author

Posts: 55
2020
Location: United Kingdom
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.
margareta456
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 1:40 AM (#21055 - in reply to #20978) (#21055) Top




Posts: 25
20
Location: Poland
 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


Plucky
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 2:33 AM (#21056 - in reply to #20978) (#21056) Top




Posts: 8

Location: United Kingdom
 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.
Vishal
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 2:53 PM (#21058 - in reply to #21052) (#21058) Top




Posts: 21
20
Location: India
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..
deu
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 4:30 PM (#21059 - in reply to #20978) (#21059) Top




Posts: 66
202020
Location: Japan
 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


gaurav.kjain
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 5:47 PM (#21060 - in reply to #20978) (#21060) Top


Irregular Variations (SM 15/16) Author

Posts: 32
20
Location: india
 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


kishy72
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 8:02 PM (#21061 - in reply to #20978) (#21061) Top




Posts: 306
100100100
Location: india
 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!
bskbri
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 8:14 PM (#21062 - in reply to #21061) (#21062) Top


Sudoku Grand Prix - Turkish Round Author

Posts: 24
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Location: Turkey
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?
David McNeill
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 8:25 PM (#21063 - in reply to #21062) (#21063) Top


Triplets & Triangles Author

Posts: 55
2020
Location: United Kingdom
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.
An LMI player
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 9:00 PM (#21064 - in reply to #20978) (#21064) Top


 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


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