Diagonal Sudoku Samurai

Diagonal Samurai Sudoku X for New Year’s Day – this is the only place you can find these kind of Sudoku puzzles! Warning: Today’s puzzle is the MOST difficult Samurai X yet! Basically, not only do you have to fight against 5 interconnected Sudokus, but you also need to be carefull about the diagonals: ALL diagonals in the puzzle must contain one occurrence of each 1-9 digit. The diagonals are marked in the puzzle so you wouldn’t forget about them.
(click to download or right-click to save the image!)

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To see the solution to this puzzle click here
UPDATE: Download this file to see the solution up to the critical point, when you must use “X-Wing” (for number 5 in the upper left sub-puzzle), which indirectly solves one cell and after that it should be relatively easy to do (no fancy stuff required). I warned you – this was an extremely difficult puzzle :).
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  1. Fernando Alves de Castro
    Posted January 7, 2006 at 12:44 pm | Permalink

    To solve this one do we need any special technique or is it business as usual?

    Best regards.

    Fernando Castro

  2. Posted January 7, 2006 at 1:10 pm | Permalink

    Fernando, this one is extremely difficult because it requires X-Wing to solve.

    Hint: X-Wing is for number 5 in the upper-left 9×9 sub-Sudoku.

  3. Sue
    Posted January 9, 2006 at 5:46 pm | Permalink

    Another Samurai solver program has told me this is not solvable! I certainly couldn’t solve it.

  4. Posted January 9, 2006 at 6:05 pm | Permalink

    Sue, as far as i know there are no other Samurai programs that can handle Samurai “X”, which means that the diagonals must also contain all numbers 1-9.

    If you don’t take that into consideration, then there are probably multiple solutions.

    I will upload an image showing the position up to the critical move required to solve this puzzle.

  5. Stephen
    Posted January 10, 2006 at 4:27 pm | Permalink

    I have finally solved the Samurai X – HNY however I came back to the site as the only way I found to solve it was to run two alternatives until it became clear which worked. Oddly (before having looked at your tip) I chose the 5-9 combination from the right column of the top left puzzle as the two alternatives. 5 in the lower of the two quickly produced an error which left 9 as the key to the rest of the solution. The whole puzzle then took no more than an hour or so to solve. I was curious as to why I couldn’t see a logical solution and saw your tip to use x-wing. Having looked at the x-wing method I am still none the wiser, what am I missing? Many thanks though for a thoroughly frustrating puzzle.

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