Timeline for Sudoku board hint (part 2)
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Mar 11, 2017 at 23:38 | comment | added | Jonathan Allan | @PeregrineRook also note that you don't have to start at the values I started with it works for most (maybe even all) of the incorrect values on this grid! | |
| Mar 11, 2017 at 23:23 | comment | added | Jonathan Allan | There is also an X-Cycle of length 6 but I do't think it sticks out as a pattern to recognise either. | |
| Mar 11, 2017 at 23:18 | comment | added | Jonathan Allan | The other answer is also a "suppose X is Y" ... "contradiction" too BTW - if you have a pattern recognition method feel free to add value by answering! | |
| Mar 11, 2017 at 23:17 | comment | added | Jonathan Allan | Well if you want the strategy name it's called Alternating inference chains. But it is effectively guess and check, much like a lot of "advanced" strategies. Another way to do the same would be 3D Medusula - which is colouring the values which reveals the same contradictions (and many others on the same path at the same time). | |
| Mar 11, 2017 at 23:13 | comment | added | Peregrine Rook | We all know the Sudoku move of last resort: Guess a value and proceed to solve the puzzle based on that guess. If you hit a contradiction (impossible situation), you know your guess must have been wrong, so backtrack and restart, knowing that that value is wrong. ISTM that that’s all you’re doing here. Do you have some elegant procedure for identifying these values that cause a different 3×3 square to become unsolvable, or is it just brute force? | |
| Mar 10, 2017 at 19:23 | history | edited | Jonathan Allan | CC BY-SA 3.0 |
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| Mar 9, 2017 at 10:18 | history | edited | Jonathan Allan | CC BY-SA 3.0 |
added 1 character in body
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| Mar 9, 2017 at 10:07 | history | answered | Jonathan Allan | CC BY-SA 3.0 |