## Sudokus with an original rare shape

Everything about Sudoku that doesn't fit in one of the other sections
Code: Select all
` 7 . . 6 . . 5 . . . 8 . . 9 . . 3 . . . . . . 1 . . . 6 . . 7 . . 2 . . . 3 . . 4 . . 8 . . . . . . . . . . 1 . . 2 . . 7 . . . 4 . . 3 . . 9 . . . . . . . . . . SE 9.8/9.8 Pearl, minimal, 19 givens,                    symmetric about the 8x8 anti-diagonal`

As always, diagonals offer a rich seam.

Regards,

Mike Metcalf

m_b_metcalf
2017 Supporter

Posts: 10015
Joined: 15 May 2006
Location: Berlin

jpf will surely recognize this diminished version of a well-known pattern:
Code: Select all
` . 6 . . . . . . 8 . . 1 . 2 . . 3 . . . . 7 . . 5 . . . . 3 . 1 9 . . . . . . . 5 4 . 2 . . . . 8 . . 6 . . . . 9 . . 3 . 1 . . 8 . . . . . . 7 . . . . . . . . .  SE 9.0, 9.0 Pearl, minimal, 20 clues,                    symmetric about the 8x8 diagonal and anti-diagonal`

Once again, there are striking symmetries also in the values.

Regards,

Mike Metcalf

m_b_metcalf
2017 Supporter

Posts: 10015
Joined: 15 May 2006
Location: Berlin

### A 20-clue Sudoku with 90Ã‚Â°rotational Symmetry

Code: Select all
`. . . . 9 . . . .. . . 5 . 3 6 . .. 1 7 . . . 4 . .. 9 . . . . . 2 .8 . . . . . . . 5. 4 . . . . . 3 .. . 2 . . . 9 7 .. . 3 8 . 4 . . .. . . . 1 . . . .`
SE 2.0

With best wishes

Claudia
claudiarabia

Posts: 288
Joined: 14 May 2006

### Re: A 20-clue Sudoku with 90Ã‚Â°rotational Symmetry

claudiarabia wrote:
Code: Select all
`. . . . 9 . . . .. . . 5 . 3 6 . .. 1 7 . . . 4 . .. 9 . . . . . 2 .8 . . . . . . . 5. 4 . . . . . 3 .. . 2 . . . 9 7 .. . 3 8 . 4 . . .. . . . 1 . . . .`
SE 2.0

Dear Claudia,

Nice to hear from you again.
Code: Select all
` . . . . 9 . . . . . . . 6 . 5 8 . . . 1 2 . . . 3 . . . 5 . . . . . 9 . 8 . . . . . . . 1 . 7 . . . . . 4 . . . 4 . . . 7 6 . . . 9 3 . 1 . . . . . . . 8 . . . . SE 8.3`

Mit besten Grüssen, von Deinem Nachbar,

Mike Metcalf

m_b_metcalf
2017 Supporter

Posts: 10015
Joined: 15 May 2006
Location: Berlin

Code: Select all
`. . . . . . . . . . . 1 . . . 2 . . . . . 3 4 5 . . . . . . . 6 . . . . . . 6 7 2 3 8 . . . 9 . . . . . 5 . 4 . . . . . . . 3 2 . . . . . . . 6 3 7 . . . . . 9 5      `

HER.E

JPF
JPF
2017 Supporter

Posts: 3755
Joined: 06 December 2005
Location: Paris, France

Here's a nice star shape with good economy of clues (18):
"Raphael"
Code: Select all
`..........9..1..3...6.2.7.....3.4...21.....98...........25.64...8.....1..........`
(by Vic Reinhart)
olimpia

Posts: 35
Joined: 14 November 2008
Location: USA

### "cat" (Layout by nataraj) — 28 cells given

my 1st example is Mild
Mild.PNG (2.61 KiB) Viewed 533 times
4.......578.....395.6...8.11...3...7.47...32.....4....9..654..2.1.....6....821...
[ play ]

my 2nd example does require 1 "advanced" move
Code: Select all
` 3 . . . . . . . 5  7 8 . . . . . 4 6  5 . 6 . . . 9 . 1  1 . . . 9 . . . 7  . 9 7 . . . 8 2 .  . . . . 4 . . . .  9 . . 6 5 4 . . 2  . 1 . . . . . 5 .  . . . 3 2 1 . . . `
3.......578.....465.6...9.11...9...7.97...82.....4....9..654..2.1.....5....321...
[ play ]

Pat

Posts: 3789
Joined: 18 July 2005

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