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MM 1575 11-1-09

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Nov 01, 2009 7:22 pm    Post subject: MM 1575 11-1-09 Reply with quote
001800200200060800000000030013970560000000000087035910050000090008090004002006300

Code:

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

Play online


open in andrew stuarts online solver

i'd call this one tricky. Question Confused
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Nov 01, 2009 8:43 pm    Post subject: Reply with quote
Lots of possibilities! Very Happy
Code:
 *--------------------------------------------------------------------*
 | 3579   3679-4 1      | 8     *45     3479   | 2      457    679    |
 | 2      3479   459    | 137    6      13479  | 8      457    179    |
 | 8      4679  b4569   | 127   a1245   1479   | 1467   3      1679   |
 |----------------------+----------------------+----------------------|
 | 4      1      3      | 9      7      2      | 5      6      8      |
 | 59     2      59     | 6      18     18     | 47     47     3      |
 | 6      8      7      | 4      3      5      | 9      1      2      |
 |----------------------+----------------------+----------------------|
 | 137    5     c46     | 1237   1248   13478  | 167    9      167    |
 | 137    367    8      | 5      9      137    | 167    2      4      |
 | 179   *479    2      | 17     1-4    6      | 3      8      5      |
 *--------------------------------------------------------------------*
 (4=5)r1c5-(5)r3c5=(5-6)r3c3=(6-4)r7c3=(4)r9c2 => r1c2,r9c5<>4;
singles
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Nov 06, 2009 4:47 pm    Post subject: Reply with quote
Quote:
Lots of possibilities!

Not for me, unfortunately. I had to give up. What technique is described by the notation?
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Fri Nov 06, 2009 6:05 pm    Post subject: Reply with quote
Marty R. wrote:
Not for me, unfortunately. I had to give up. What technique is described by the notation?

I don't know the technique name other than chain. Pincher 4 connected by a chain? Confused
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Nov 06, 2009 6:46 pm    Post subject: Reply with quote
Code:
 after Naked/Hidden Singles
 *--------------------------------------------------------------------*
 | 3579   34679  1      | 8      45     3479   | 2      457    679    |
 | 2      3479   459    | 137    6      13479  | 8      457    179    |
 | 8      4679   4569   | 127    1245   1479   | 1467   3      1679   |
 |----------------------+----------------------+----------------------|
 | 4      1      3      | 9      7      2      | 5      6      8      |
 | 59     2      59     | 6      18     18     | 47     47     3      |
 | 6      8      7      | 4      3      5      | 9      1      2      |
 |----------------------+----------------------+----------------------|
 | 137    5      46     | 1237   1248   13478  | 167    9      167    |
 | 137    367    8      | 5      9      137    | 167    2      4      |
 | 179    479    2      | 17     14     6      | 3      8      5      |
 *--------------------------------------------------------------------*

There's a "r57c56 <18> UR Type 4 => r7c56<>1", but it doesn't contribute much. However, it does signal that another pattern might be present. This pattern doesn't have a name, but it has a short chain that I see all of the time (after my solver points it out).

Code:
SL on <8>         : (8)r7c6 = (8- )r5c6
SL on <1>         :           ( -1)r5c6 = (1)r5c5
WL to Bivalue cell:                               - (1=4)r9c5
Conclusion        : r7c6 <> 4
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Nov 06, 2009 10:31 pm    Post subject: Reply with quote
I used the Type 4 in the conventional way, but as you said, it was of little help. Drawing the conclusions based on the two SL's is, I'm sorry to say, beyond my level of understanding.
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