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April 17 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 668
Location: Dar es Salaam Tanzania

PostPosted: Sat Apr 16, 2011 10:24 pm    Post subject: April 17 VH Reply with quote

XY-Wing 19 18 89 pivoted in r5c1 solves it by setting r9c9<>9.
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Ema Nymton



Joined: 17 Apr 2009
Posts: 87

PostPosted: Sun Apr 17, 2011 10:13 am    Post subject: Reply with quote

.

The solution "XY-Wing 19 18 89 pivoted in r5c1 solves it by setting r9c9<>9." not withstanding, a question comes up.

Code:

+-------------+----------+--------------+
| 4   8    1  | 25 7  59 | 239 6   239  |
| 3   259  57 | 26 1  69 | 279 8   4    |
| 279 29   6  | 8  4  3  | 5   129 1279 |
+-------------+----------+--------------+
| 27  2456 9  | 1  36 8  | 237 245 237  |
| 18  14   3  | 7  5  2  | 6   49  89   |
| 278 256* 57 | 9  36 4  | 1   25  2378 |
+-------------+----------+--------------+
| 5   3    2  | 4  9  1  | 8   7   6    |
| 6   19   4  | 3  8  7  | 29  129 5    |
| 19  7    8  | 56 2  56 | 4   3   19   |
+-------------+----------+--------------+


At this point in the puzzle, using 'HINT' results in r6c2 = '6'.
Is it possible to learn the reasoning behind the clue given by 'HINT'?

Ema Nymton
.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sun Apr 17, 2011 1:34 pm    Post subject: Reply with quote

Ema, I don't know if the "hint" button gives you a "logical solver" next step or just picks a cell to give you the answer to!

But in row 4 you have a naked triple 237 which makes r4c5=6 and so r6c2=6..
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Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Sun Apr 17, 2011 2:10 pm    Post subject: Reply with quote

or i'd say,
in r4 there's a "hidden" duo {4,5}
-- which solves the 6 for c2
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Sun Apr 17, 2011 4:06 pm    Post subject: Reply with quote

The XY-Wing also works as an 891, pivoted in r5c9; r9c1<>1.

Quote:
Ema, I don't know if the "hint" button gives you a "logical solver" next step or just picks a cell to give you the answer to!

Peter, the hints are based on a logical step.
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