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Triplets & Triangles — LMI February Sudoku Test — 20th to 22nd Feb | |

LMI Tests -> Monthly Sudoku and Puzzle Tests | 45 posts • Page 1 of 2 • 1 2 |

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Location: India | Logic Masters India announces February Sudoku Test — Triplets & Triangles Dates : 20 ^{th} - 22^{nd} Feb Instruction Booklet & Submission : Link Author : David McNeill | ||||||||||||||||||

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Location: India | Instructions booklet published. | ||||||||||||||||||

Para |
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Posts: 311 Location: The Netherlands | You'd have thought that this test would have been held in March. | ||||||||||||||||||

margareta456 |
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Posts: 30 Location: Poland | will the result of Triplets & Triangles consider in LMI Sudoku Ratings? | ||||||||||||||||||

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Location: India | margareta456 - 2016-02-16 7:37 PM Yes.will the result of Triplets & Triangles consider in LMI Sudoku Ratings? | ||||||||||||||||||

kishy72 |
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SM 2020 (Math) Author Posts: 381 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 |
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Mean Minis (2020) Author Posts: 749 Location: India | kishy72 - 2016-02-17 7:46 PM 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.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.... | ||||||||||||||||||

kishy72 |
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SM 2020 (Math) Author Posts: 381 Location: india | rakesh_rai - 2016-02-17 8:37 PM kishy72 - 2016-02-17 7:46 PM 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.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.... 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 |
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Mean Minis (2020) Author Posts: 749 Location: India | kishy72 - 2016-02-18 12:14 AM 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....how did you find which cell in R2C3 contains the triangle in the first place? | ||||||||||||||||||

rajeshk |
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WSPC Organizer Posts: 502 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 |
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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? | ||||||||||||||||||

David McNeill |
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Triplets & Triangles Author Posts: 58 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 |
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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.. | ||||||||||||||||||

mihiryadav |
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Posts: 27 Location: INDIA | Not able to figure out the two digits which is pointed by corresponding arrowhead. | ||||||||||||||||||

David McNeill |
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Triplets & Triangles Author Posts: 58 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 |
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Triplets & Triangles Author Posts: 58 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 |
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Posts: 30 Location: Poland |
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Plucky |
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Posts: 8 Location: United Kingdom |
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 |
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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.. | ||||||||||||||||||

deu |
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Posts: 69 Location: Japan |
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gaurav.kjain |
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SM 2020 (Irregular and Outside) Author Posts: 49 Location: india |
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kishy72 |
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SM 2020 (Math) Author Posts: 381 Location: india |
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 |
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Sudoku Grand Prix - Turkish Round Author Posts: 31 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 |
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Triplets & Triangles Author Posts: 58 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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