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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
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: 63
202020
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: 63
202020
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: 30
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: 22
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: 69
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


SM 2020 (Irregular and Outside) Author

Posts: 52
2020
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


SM 2020 (Math) Author

Posts: 417
100100100100
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: 34
20
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: 63
202020
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


misko
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 9:01 PM (#21065 - in reply to #20978) (#21065) Top




Posts: 11

Location: Germany
 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


aashay
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 10:09 PM (#21066 - in reply to #20978) (#21066) Top




Posts: 46
2020
Location: India
I am unable to submit Classic-3 solution. The answer key is A - 249516837 and B - 847925316

Sorry, was typing the wrong answer I guess. The key was not allowing me to submit.

Edited by aashay 2016-02-20 10:27 PM
An LMI player
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 10:11 PM (#21067 - in reply to #20978) (#21067) 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. 5. Anti-Diagonal
 Your 3 most favorite puzzles of the contest. 6. Outside Sums
 Your 3 most favorite puzzles of the contest. 11. Non-Consecutive Squeeze


An LMI player
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 11:37 PM (#21068 - in reply to #20978) (#21068) 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? 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


rakesh_rai
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-20 11:58 PM (#21069 - in reply to #20978) (#21069) Top



Mean Minis (2020) Author

Posts: 774
500100100202020
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. 13. Triangular Sums
 Your 3 most favorite puzzles of the contest. 9. Thropki
 Your 3 most favorite puzzles of the contest. 14. Arrowhead


Swagatam
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-21 12:14 AM (#21071 - in reply to #20978) (#21071) Top




Posts: 45
2020
Location: India
 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. 5. Anti-Diagonal
 Your 3 most favorite puzzles of the contest. 6. Outside Sums
 Your 3 most favorite puzzles of the contest. 4. Trio


An LMI player
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-21 1:25 AM (#21072 - in reply to #20978) (#21072) 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? Just right
 What did you think about the puzzle quality of the test? Very nice
 Your 3 most favorite puzzles of the contest. 8. Thropki
 Your 3 most favorite puzzles of the contest. 7. Max/Min Triplet Sums
 Your 3 most favorite puzzles of the contest. 6. Outside Sums


tiphan
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-21 12:22 PM (#21074 - in reply to #20978) (#21074) Top




Posts: 4

Location: France
 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. 5. Anti-Diagonal
 Your 3 most favorite puzzles of the contest. 4. Trio
 Your 3 most favorite puzzles of the contest. 1. Classic


TiiT
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-21 6:47 PM (#21077 - in reply to #20978) (#21077) Top




Posts: 139
10020
Location: Estonia
 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? Fairly Nice
 Your 3 most favorite puzzles of the contest. 11. Non-Consecutive Squeeze
 Your 3 most favorite puzzles of the contest. 12. Renban Squeeze
 Your 3 most favorite puzzles of the contest. 14. Arrowhead


Vishal
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-21 7:38 PM (#21079 - in reply to #20978) (#21079) Top




Posts: 22
20
Location: India
 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. 14. Arrowhead
 Your 3 most favorite puzzles of the contest. 6. Outside Sums


rajeshk
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-22 11:47 AM (#21089 - in reply to #20978) (#21089) Top



WSPC Organizer

Posts: 542
5002020
Location: India
 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 medium difficult 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. 5. Anti-Diagonal
 Your 3 most favorite puzzles of the contest. 11. Non-Consecutive Squeeze


An LMI player
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-22 12:12 PM (#21090 - in reply to #20978) (#21090) 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 medium difficult puzzles
 What did you think about the puzzle quality of the test? Very nice
 Your 3 most favorite puzzles of the contest. 4. Trio
 Your 3 most favorite puzzles of the contest. 5. Anti-Diagonal
 Your 3 most favorite puzzles of the contest. 10. Tight Fit


rvarun
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-22 10:40 PM (#21092 - in reply to #20978) (#21092) Top




Posts: 268
100100202020
Location: India
 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. 5. Anti-Diagonal


Thanks for the great set of puzzles David. The solving path was seamless in the puzzles I attempted. Personally, back to solving puzzles after a brief period of 2-3 months and it was a great experience for me attempting the puzzles. Hope to be active in the upcoming contests.
tamz29
Subject: Re: Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb @ 2016-02-23 12:40 AM (#21095 - in reply to #20978) (#21095) Top




Posts: 225
10010020
Location: Thailand
That was fun :)
Thanks David, some very interesting new variants here.
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