Sudokus with an original rare shape

Everything about Sudoku that doesn't fit in one of the other sections

A stripe sprangled sudoku

Postby claudiarabia » Sun Aug 27, 2006 9:54 am

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


Happy solving!

Claudia
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UR Type 1 <58>

Postby claudiarabia » Wed Aug 30, 2006 8:19 pm

daj95376 wrote:Claudia,
Code: Select all
. . . . . . . . .
. 2 4 . . . 8 6 .
. 8 . 7 . 5 4 . .
. 9 . . 4 8 . 1 .
. . . 2 . 3 . . .
. 4 . 1 7 . . 3 .
. . 2 3 . 6 . 8 .
. 3 9 . . . 7 2 .
. . . . . . . . . 
Did you catch the UR Type 1 on <58>? It eliminates the XY-Chain and make both variants of this puzzle have identical solutions.

[Update:] It occurs to me that you might be using an XY-Chain where Simple Sudoku chose to use Multi-Coloring. If so, then the UR Type 1 wouldn't affect your solution. I'm sorry if I only made things confusing!


Sorry, I didn't spot the UR Type 1 on <58>. Do you mean c4 in r8 and 9? Maybe I solved the cells around another way.

Anyway, After using the "simple past"-method, I chose to make a chain out of the three free cells in column 8: r1 = 57, r 5 = 47, r9 = 45. I assumed r5c8 to be 4 and found a contradiction then while trying to complete the box containing r4-6 c1-3. The puzzle was solved then very easily too.

Claudia
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Postby daj95376 » Wed Aug 30, 2006 11:15 pm

Yes, the UR Type 1 was off <58> in [r89c14]. Another way is to use Colors and Multi-Colors to get the same elimination of [r9c1]<>58. It's possible that you took this route. Anyway, after the UR elimination, Colors and Multi-Colors are all that's needed (besides singles) to complete the puzzle.
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a 21-clue sudoku rated 8,4 by Sudoku-Explainer

Postby claudiarabia » Thu Aug 31, 2006 11:30 am

Code: Select all
3 . . . 7 . . . 1
. 8 . . . . . 5 .
. . . 9 . . 6 . .
. 6 . . . 1 . 8 .
. . . . 4 . . . .
. 5 . 2 . . . 9 .
. . 4 . . 5 . . .
. 9 . . . . . 2 .
5 . . . 3 . . . 7
who likes it minimal may omit r9c1.
:)
Claudia
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stuck with the SE-Level 8,4

Postby claudiarabia » Tue Sep 05, 2006 9:08 am

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


Claudia
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Postby JPF » Tue Sep 05, 2006 12:17 pm

Your catamaran is very nice.

Here is a brand-new model : lighter and easier to control:)

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



JPF
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Postby claudiarabia » Wed Sep 06, 2006 1:48 am

JPF wrote:Your catamaran is very nice.

Here is a brand-new model : lighter and easier to control:)

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

JPF


Thanks for this 20-clue version. Yes it's a beauty. Not only lighter but faster too. And safer for I can recover from turbot-fish-attacks this time.

Claudia
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Posts: 288
Joined: 14 May 2006

Postby JPF » Wed Sep 06, 2006 1:35 pm

Code: Select all

 . . . . . . . . 5
 . . 1 7 . . . 4 .
 . 2 . . 9 . 8 . .
 . 1 . . . 7 . . .
 . . 3 . . . 2 . .
 . . . 1 . . . 5 .
 . . 5 . 3 . . 1 .
 . 8 . . . 2 6 . .
 9 . . . . . . . .     spinning top


easy

JPF
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A diagonal symmetry with a broad road in the middle

Postby claudiarabia » Sat Sep 09, 2006 3:16 pm

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

Not as straight as ab's slashes but still challenging.:)

Claudia
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soft hearts

Postby claudiarabia » Sat Sep 09, 2006 3:36 pm

maria45 wrote:I don't know if these true hearts are already known. Thanks to ajb:
Code: Select all
.15...26.
9..4.1..8
8...2...3
4.......6
2.......7
.6.....5.
..9...1..
...5.7...
....9....

.79...43.
6..2.5..9
3...7...5
8.......7
.2.....8.
.4.....6.
..6...5..
...7.4...
....1....
easy to solve, so just for the soft hearted.

Thank you. Not known to me until now.

Claudia
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Postby daj95376 » Sat Sep 09, 2006 4:36 pm

Code: Select all
.........8...2...5.....624..3...71..1.5...6.9..74...2..725.....6...8...1.........

# after basic eliminations
 *--------------------------------------------------------------------*
 | 3457   2      1369   | 1389   459    3589   | 389    13689  3678   |
 | 8      169    13469  | 7      2      349    | 39     1369   5      |
 | 357    159    139    | 1389   59     6      | 2      4      378    |
 |----------------------+----------------------+----------------------|
 | 2      3      68     | 69     569    7      | 1      58     4      |
 | 1      4      5      | 28     3      28     | 6      7      9      |
 | 9      68     7      | 4      156    15     | 358    2      38     |
 |----------------------+----------------------+----------------------|
 | 34     7      2      | 5      1469   139    | 3489   3689   68     |
 | 6      59     349    | 23     8      234    | 7      35     1      |
 | 345    18     18     | 369    7      39     | 3459   3569   2      |
 *--------------------------------------------------------------------*

[r4c5]=5 =>                         [r6c6]=1
         => [r3c5]=9 => [r1c5]=4 => [r2c6]=3 => [b8]=INVALID

Therefore, [r4c5]<>5

Puzzle solves with singles from here.
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Postby ronk » Sat Sep 09, 2006 4:59 pm

A spider maybe ...

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

A very difficult spider BTW.
ronk
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Postby JPF » Sat Sep 09, 2006 6:36 pm

ronk wrote:A spider maybe ...
A very difficult spider BTW.

When I look at the solution given by some web solvers to your puzzle,
it looks like a spider's web.

Some variations :
Code: Select all
050040006000000530000000010001200000040050008900007000200006000080030004007100000
030040002000000530000000010001600000040050008600007000200006000050080004007100000

JPF
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Postby ronk » Sat Sep 09, 2006 8:47 pm

JPF wrote:When I look at the solution given by some web solvers to your puzzle

Wish it were mine. However, it's merely a permutation of an Ocean "X puzzle" from here ... with one clue deleted.

Ocean wrote:# ER-9.9:
100000002030040050006000700000103000040060080000405000002000900050030040700000001
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Postby JPF » Sat Sep 09, 2006 9:23 pm

ronk wrote:However, it's merely a permutation of an Ocean "X puzzle"

Well done !:)

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