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Jun 18 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Sun Jun 17, 2012 10:19 pm    Post subject: Jun 18 VH Reply with quote
XY-Wing 38 13 18 pivoted in r5c2; r1c6<>8 solves it.
Also the the following:-
Remote Pairs 13; r1c2<>3
A kite on 3 originating from BOX 1; r6c5<>3
BUG+1; r2c2=3.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Mon Jun 18, 2012 9:00 am    Post subject: Jun 18 VH Reply with quote
Code:

+----------+----------+--------+
| 9  38  4 | 5  13 18 | 2 7 6  |
| 13 138 7 | 2  9  6  | 4 5 38 |
| 5  2   6 | 38 4  7  | 9 1 38 |
+----------+----------+--------+
| 8  6   9 | 4  2  5  | 1 3 7  |
| 4  13  5 | 38 7  18 | 6 9 2  |
| 13 7   2 | 6  13 9  | 8 4 5  |
+----------+----------+--------+
| 6  4   3 | 1  5  2  | 7 8 9  |
| 2  9   1 | 7  8  3  | 5 6 4  |
| 7  5   8 | 9  6  4  | 3 2 1  |
+----------+----------+--------+

Play this puzzle online at the Daily Sudoku site

Is this the simplest after-basics VH diagram ever? (Apart
from those that come out with baiscs only of course....)
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RobertRattley



Joined: 24 Jun 2007
Posts: 118
Location: Australia
PostPosted: Thu Jun 28, 2012 2:27 pm    Post subject: Reply with quote
"Is this the simplest after-basics VH diagram ever?"

It's the simplest I've ever seen. Surely it must be the simplest possible, or close to it, that still needs a "very hard" technique.

Amazing.
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Pat



Joined: 23 Feb 2010
Posts: 207
PostPosted: Sun Jul 01, 2012 7:18 am    Post subject: re: Is this the simplest after-basics VH diagram ever? Reply with quote
hughwill wrote:
Is this the simplest after-basics VH diagram ever?

examples have been seen where only 11 cells remain unsolved

here's one from Ruud (2006.Feb.11)
( 2nd puzzle in his post )
Code:

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


    24 cells given + 46 "singles" = 70 cells known --
    .3.1.498548195267359..3821492854713637521649816438975281.4.35.9659821347.43.958.1
    [ play ]
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