Hint on a puzzle

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Hint on a puzzle

Postby ramasama » Mon Sep 01, 2014 2:43 am

Hey! first time posting and already asking for hints :)

I'm stuck on the first puzzle of Frank Longo's "Absolutely Nasty Sudoku lvl 3"
Code: Select all
3 . . | . 1 6 | . . .
. 1 . | 7 . . | 9 2 8
. . . | . 8 . | . 1 6
------+-------+------
. . 7 | . . 4 | . . 1
. . . | . 5 . | . . .
4 . . | 6 . . | 5 . .
------+-------+------
7 2 . | . 6 . | . . .
9 8 5 | . . 2 | . 6 .
. . . | 5 9 . | . . 3


With all the basic techniques I've managed to get the following:
Code: Select all
3 9 8 | 2 1 6 | . . .
. 1 . | 7 . . | 9 2 8
. 7 . | . 8 . | 3 1 6
------+-------+------
. 5 7 | . . 4 | 6 . 1
. 6 . | . 5 . | . . .
4 3 . | 6 . . | 5 . .
------+-------+------
7 2 3 | . 6 . | . . .
9 8 5 | . . 2 | . 6 .
. 4 . | 5 9 . | 2 . 3


The only extra thing I did was to eliminate some pencilmarks on the bottom right chute, leaving it like this:
Code: Select all
3     9      8    | 2     1      6     | 47    457    457
56    1      46   | 7     34     35    | 9     2      8
25    7      24   | 49    8      59    | 3     1      6
------------------+--------------------+-------------------
28    5      7    | 389   23     4     | 6     389    1
128   6      129  | 1389  5      13789 | 478   34789  2479
4     3      129  | 6     27     1789  | 5     789    279
------------------+--------------------+-------------------
7     2      3    | 148   6      18    | 148   59     59
9     8      5    | 134   347    2     | 147   6      47
16    4      16   | 5     9      78    | 2     78     3


If someone could give me a hint on what technique I need to use to continue I would be appreciated.
The most advanced technique I have used is XY-wing, which I used to solve puzzle number 2 of the same book, so I must be missing something with this one..
Thanks in advance!
ramasama
 
Posts: 2
Joined: 01 September 2014

Re: Hint on a puzzle

Postby JasonLion » Mon Sep 01, 2014 1:02 pm

There is an X-Wing which leaves the puzzle solvable with just singles.
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JasonLion
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Location: Silver Spring, MD, USA

Re: Hint on a puzzle

Postby ramasama » Mon Sep 01, 2014 10:18 pm

Solved! Thanks a lot. I should have kept trying. It was right there!
ramasama
 
Posts: 2
Joined: 01 September 2014


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