The New Sudoku Players' Forum

[denis_berthier]

This puzzle belongs to the general LOZENGE family of perfectly symmetric puzzles: http://forum.enjoysudoku.com/perfectly-symmetric-patterns-t38444.html, more precisely to the lozenge-tiling pattern (that allows a semi-regular tiling of the plane).

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X———X———X
—X—X—X—X—
——X———X——
—X—————X—
X———————X
—X—————X—
——X———X——
—X—X—X—X—
X———X———X

Contrary to the lozenges 8.3 puzzle I proposed before, it doesn't have an inner small lozenge.

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   +-------+-------+-------+
   ! 6 . . ! . 8 . ! . . 1 !
   ! . 4 . ! 7 . 1 ! . 9 . !
   ! . . 3 ! . . . ! 8 . . !
   +-------+-------+-------+
   ! . 8 . ! . . . ! . 5 . !
   ! 7 . . ! . . . ! . . 4 !
   ! . 2 . ! . . . ! . 7 . !
   +-------+-------+-------+
   ! . . 9 ! . . . ! 3 . . !
   ! . 1 . ! 4 . 3 ! . 8 . !
   ! 3 . . ! . 5 . ! . . 9 !
   +-------+-------+-------+

6...8...1.4.7.1.9...3...8...8.....5.7.......4.2.....7...9...3...1.4.3.8.3...5...9 # 95318 FNBHXYK C24.M/S8.f
SER 8.3

If you like oddagons, you can find some here also.

[Leren]

If you like Uniqueness moves, you'll find these:

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*---------------------------------------------------*
| 6   579 257  | 259   8     2459  | 457  3    1    |
| 258 4   258  | 7     3     1     |*6-5  9   *25-6 |
| 1   579 3    | 2569  246   24569 | 8    24   257  |
|--------------+-------------------+----------------|
| 49  8   146  | 1269  12467 24679 | 129  5    3    |
| 7   3   15   | 12589 12    2589  | 129  6    4    |
| 459 2   1456 | 3     146   4569  | 19   7    8    |
|--------------+-------------------+----------------|
| 48  567 9    | 1268  1267  2678  | 3    124  257  |
| 25  1   257  | 4     9     3     |*57-6 8   *6-5  |
| 3   67  48   | 1268  5     2678  | 47   124  9    |
*---------------------------------------------------*

Unique Rectangle Type 6 {56} r2c79, r8c79 => - 5 r3c7, - 6 r3c9, r8c7, -5 r8c9

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*------------------------------------------------*
| 6   79 25   | 259   8     2459  | 47  3    1   |
| 58  4  258  | 7     3     1     |*6   9   *2-5 |
| 1   79 3    | 2569  246   24569 | 8   24   257 |
|-------------+-------------------+--------------|
| 49  8  146  | 1269  12467 24679 | 129 5    3   |
| 7   3  15   | 12589 12    2589  | 129 6    4   |
| 459 2  1456 | 3     146   4569  | 19  7    8   |
|-------------+-------------------+--------------|
| 48  5  9    | 1268  1267  2678  | 3   124  27  |
| 2   1  7    | 4     9     3     |*5   8   *6   |
| 3   6  48   | 128   5     278   | 47  124  9   |
*------------------------------------------------*

Avoidable Rectangle (56) r28c79 => - 5 r7c9; stte

How did I know that the solution was unique ? Divine inspiration Leren

[denis_berthier]

How did I know that the solution was unique ? Divine inspiration Leren

I have nothing about divine inspiration or uniqueness (though uniqueness...) but I can hardly admit the pata-logic of the AR (copied from Hodoku):

Avoidable Rectangles differ from Unique Rectangles in that some cells of the UR have already been placed. If placing the remaining cell(s) would cause an UR, the sudoku maker would have had to supply one of the four cells as a given to avoid a possible second solution (hence the name)...

Nothing divine, just guessing what could have been in the puzzle creator's brain