This is supposed to be easy

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This is supposed to be easy

Postby 5krunner » Tue Dec 27, 2005 3:57 pm

I'm an intermediate a Sudoku but his is supposedly an easy puzzle ... however, I'm stumped. Any one have a suggestion on the nexts step? Thank you!!

x 4 x ! 7 x 6 ! 3 x x
3 x x ! x 1 x ! 8 x x
5 x 1 ! 4 3 x ! 8 x x
------+-------+------
4 x x ! x 7 x ! x 8 9
7 2 9 ! 8 4 1 ! x 3 x
8 x x ! x 5 x ! x x 7
------+------+-------
x x 4 ! 1 x x ! 9 x 3
1 x x ! x 2 x ! x x x
x x 7 ! 3 x 4 ! x 5 x
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Postby Carcul » Tue Dec 27, 2005 4:25 pm

Hi 5krunner.

In your puzzle there are two "8" in column seven. You have to correct the grid.

Regards, Carcul
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Re: This is supposed to be easy

Postby Pat » Tue Dec 27, 2005 4:31 pm

5krunner wrote:this is supposedly an easy puzzle

however, I'm stumped

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


the 2 for box 7 must be in c1

this settles r1c1

- Pat
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Postby 5krunner » Tue Dec 27, 2005 4:52 pm

Sorry ... here's the corrected puzzle:

x 4 x ! 7 x 6 ! 3 x x
3 x x ! x 1 x ! x x 4
5 x 1 ! 4 3 x ! 8 x x
------+-------+------
4 x x ! x 7 x ! x 8 9
7 2 9 ! 8 4 1 ! x 3 x
8 x x ! x 5 x ! x x 7
------+------+-------
x x 4 ! 1 x x ! 9 x 3
1 x x ! x 2 x ! x x x
x x 7 ! 3 x 4 ! x 5 x
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Postby ihope127 » Tue Dec 27, 2005 5:43 pm

After a pinned square, the rest is forced moves. Here's the pin:

The pin is R1C9, which has to be 5.
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Postby tso » Tue Dec 27, 2005 5:52 pm

Only one cell in row one can still take a 5.
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Postby MCC » Tue Dec 27, 2005 6:06 pm

5krunner

It would help us to help you if in future you would post your candidate list at the same time you post the puzzle you're stuck on.

This is the candidate list for your puzzle, I'll assume this is where you're at.

Code: Select all
29    4     28  |7    89   6    |3     129   125
3     6789  268 |259  1    2589 |2567  2679  4 
5     679   1   |4    3    29   |8     2679  26 
------------------------------------------------
4     1356  356 |26   7    23   |126   8     9 
7     2     9   |8    4    1    |56    3     56 
8     136   36  |269  5    239  |1246  1246  7   
------------------------------------------------
26    568   4   |1    68   578  |9     267   3   
1     35689 3568|59   2    5789 |467   467   68 
269   689   7   |3    689  4    |126   5     128


Naked triplet in r1 enables you to place two numbers in box 3
The 2's are locked in c1 box7. So r1c1 can be placed.

That should see you on your way.

MCC
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Postby tso » Tue Dec 27, 2005 6:18 pm

This is an easy puzzle that does not require candidates -- it is solved completely using nothing but singles.
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Postby ihope127 » Tue Dec 27, 2005 6:20 pm

tso wrote:This is an easy puzzle that does not require candidates -- it is solved completely using nothing but singles.


One single.
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Postby QBasicMac » Tue Dec 27, 2005 6:35 pm

MCC wrote:29 4 28 7 89 6 3 129 125
Naked triplet in r1 enables you to place two numbers in box 3


Please help old bad-eye's here. Which three cells above constitute the naked triplet?

Thanks

Mac
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Postby tso » Tue Dec 27, 2005 7:07 pm

ihope127 wrote:
tso wrote:This is an easy puzzle that does not require candidates -- it is solved completely using nothing but singles.


One single.


One hidden, many naked.

What you're calling a pin, I'm calling a hidden single.
What you're calling a forced move, I'm calling a naked single.


QBasicMac wrote:
MCC wrote:29 4 28 7 89 6 3 129 125
Naked triplet in r1 enables you to place two numbers in box 3


Please help old bad-eye's here. Which three cells above constitute the naked triplet?

Thanks

Mac



[29][28][89] is a naked triple. This is a perfectly valid triple making perfectly valid eliminations -- though again, the pin or hidden single followed by forced moves/naked singles is the simpler way to go and does not require candidates to be filled in. But if your goal is NOT to do things the simple way, this is actually a way to make easy puzzles like this more interesting, there are *lots* of more complex tactics available. There is another triple available -- row346c6 is a triple in [239]. Better (or worse), there is a 4 cell nice loop in r17c15...

Code: Select all
 *--------------------------------------------------------------------*
 |29------------(9)-------------89      .      | .      .      .      |
 | |      .      .      | .      |      .      | .      .      .      |
 | |      .      .      | .      |      .      | .      .      .      |
 |-|--------------------+--------|-------------+----------------------|
 |(2)     .      .      | .     (8)     .      | .      .      .      |
 | |      .      .      | .      |      .      | .      .      .      |
 | |      .      .      | .      |      .      | .      .      .      |
 |-|--------------------+--------|-------------+----------------------|
 |26------------(6)-------------68      .      | .      .      .      |
 | .      .   .  .      | .      .      .      | .      .      .      |
 | .      .      .      | .      .      .      | .      .      .      |
 *--------------------------------------------------------------------*


... eliminating 9s from the rest of the top row, 6s from the rest of row 7, 2s from the rest of column 1 and 8s from the rest of column 5.

Again, a perfectly valid deduction, very possibly more fun than simply filling in all the singles.
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Postby ihope127 » Tue Dec 27, 2005 7:28 pm

tso wrote:One hidden, many naked.

What you're calling a pin, I'm calling a hidden single.
What you're calling a forced move, I'm calling a naked single.


Aha. Hadn't really thought of them as naked singles.
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Postby 5krunner » Tue Dec 27, 2005 9:24 pm

Thank you everyone for the excellent advise. I'm slowly learning.
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Postby QBasicMac » Tue Dec 27, 2005 9:29 pm

tso wrote:[29][28][89] is a naked triple


Thanks!! I don't know how long I could stare at that line and not see it.:(

Mac
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this is the answer

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