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Posts: 27
Location: India | Can anyone tell me.....how a black triangle act as a symmetrical arrowhead and which arrowhead is pointing to the two digits? |
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Triplets & Triangles Author
Posts: 63
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? |
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Posts: 22
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.. |
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Posts: 27
Location: India | Not able to figure out the two digits which is pointed by corresponding arrowhead. |
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Triplets & Triangles Author
Posts: 63
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
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Triplets & Triangles Author
Posts: 63
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. |
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Posts: 30
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 | |
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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. |
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Posts: 22
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.. |
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Posts: 69
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 | |
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SM 2020 (Irregular and Outside) Author
Posts: 52
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 | |
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SM 2020 (Math) Author
Posts: 424
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! |
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Sudoku Grand Prix - Turkish Round Author
Posts: 34
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? |
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Triplets & Triangles Author
Posts: 63
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. |
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| | 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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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 | |
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Posts: 47
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
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| | 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 | |
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| | 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 | |
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Mean Minis (2020) Author
Posts: 774
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 | |
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Posts: 45
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 | |
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| | 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 | |
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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 | |
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Posts: 139
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 | |
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Posts: 22
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 | |
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WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent
Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb
