4-clue puzzle

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4-clue puzzle

Postby m_b_metcalf » Fri Apr 24, 2020 7:50 am

Code: Select all
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 3 8 4 . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . 2

It seems unlikely, but this puzzle apparently has a unique solution, given the following three constraints:

1) X-sudoku;

2) central box is a magic square;

3) no digit can be repeated a knight's move away.

A video showing how to solve it is here.

Regards,

Mike
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m_b_metcalf
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Re: 4-clue puzzle

Postby Hajime » Fri Apr 24, 2020 9:12 am

Very nice and only basic methods needed.
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Re: 4-clue puzzle

Postby m_b_metcalf » Tue Apr 28, 2020 7:12 am

Hajime wrote:Very nice and only basic methods needed.

Indeed, but it took me a while to solve, manually. Hope I got the same solution:
Hidden Text: Show
Code: Select all
 8 4 3 5 6 7 2 1 9
 2 7 5 9 1 3 8 4 6
 6 1 9 4 2 8 3 7 5
 3 8 4 6 7 2 9 5 1
 7 2 6 1 5 9 4 8 3
 9 5 1 8 3 4 6 2 7
 5 3 7 2 8 6 1 9 4
 4 6 2 7 9 1 5 3 8
 1 9 8 3 4 5 7 6 2

Mike
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m_b_metcalf
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