## Superior Sudoku 15 (Stuck)

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### Superior Sudoku 15 (Stuck)

Here's what I have so far.

If there are any twins that I mised, triplets, an Xwing or Swordfish, please let me know. I'm going crazy.

(9)(3)(245) | (25)(6)(8) | (1)(7)(24)
(158)(7)(258) | (4)(135)(13) | (2689)(28)(2689)
(1468)(126)(2468) | (1279)(17)(19) | (5)(248)(3)
(2)(169)(469) | (8)(1479)(5) | (467)(3)(467)
(147)(5)(3) | (167)(147)(146) | (28)(9)(28)
(467)(8)(469) | (3)(479)(2) | (467)(5)(1)
(3)(269)(1) | (569)(458)(469) | (24789)(2468)(246789)
(568)(269)(25689) | (69)(348)(7) | (23489)(1)(2489)
(68)(4)(7) | (19)(2)(139) | (39)(68)(5)

Thanks!
SuDokuKid

Posts: 31
Joined: 02 November 2005

you correctly spotted that there is a naked {6, 8} pair in R9, & {2, 8} pair in Block 6, Row 5. Also a 9 in Block 3, Row 2, so {1, 3, 9} triplet in C6.
What you failed to spot was the {3, 5, 8} triplet in C5R2 /C5R7 /C5R8.

After you spot this take a look at the 4's, and if you are still stuck let me know !

Code: Select all
`(9)(3)(245) | (25)(6)(8) | (1)(7)(24) (158)(7)(258) | (4)(135)(13) | (2689)(28)(2689) (1468)(126)(2468) | (1279)(17)(19) | (5)(248)(3) (2)(169)(469) | (8)(1479)(5) | (467)(3)(467) (147)(5)(3) | (167)(147)(146) | (28)(9)(28) (467)(8)(469) | (3)(479)(2) | (467)(5)(1) (3)(269)(1) | (569)(458)(469) | (24789)(2468)(246789) (568)(269)(25689) | (69)(348)(7) | (23489)(1)(2489) (68)(4)(7) | (19)(2)(139) | (39)(68)(5) `
Crazy Girl

Posts: 189
Joined: 08 November 2005

What makes the 3,5,8 a triplet? I can't seem to grasp that concept.

I can't see the 4s! I'm going crazy! ;)

But thanks for the help.
SuDokuKid

Posts: 31
Joined: 02 November 2005

What Crazy Girl meant was {3,5,8} could only appear on column 5 in those 3 cells, i.e. a hidden triple. So you could eliminate all other candidates in those 3 cells, and you'll find 4 could only appear at one cell in block 8...
udosuk

Posts: 2698
Joined: 17 July 2005

Is there a triple in row 6 with 4,6,7?
SuDokuKid

Posts: 31
Joined: 02 November 2005

No.

Code: Select all
`(467)(8)(469) | (3)(479)(2) | (467)(5)(1)`

For both a naked or a hidden triple, three cells must contain three numbers.

In the above example you have four cells containing the three numbers 467.

Code: Select all
`(467)-(469) | -(479)- | (467)--`

You cannot say which of the cells containing the 9 is part of the triplet, so there is no triplet.
MCC

Posts: 1275
Joined: 08 June 2005

SDK - Without of course meaning to, MCC is possibly still leaving you confused insofar as he omits to add that the three cells which make up a Naked or Hidden Triple don't have to each contain every candidate of the triple.

Have you visited angusj.com?
9X9

Posts: 100
Joined: 26 September 2005

9X9 wrote:SDK - Without of course meaning to, MCC is possibly still leaving you confused insofar as he omits to add that the three cells which make up a Naked or Hidden Triple don't have to each contain every candidate of the triple.

Have you visited angusj.com?

I can 'see' it sometimes but can't really explain it despite everything I've read on the web.
SuDokuKid

Posts: 31
Joined: 02 November 2005

SDK - nil desperandum, some aspects of sudoku logic can seem quite alien at first!

If you understand the technique (the what) but not the underlying reason (the why), don't try to "see it" but just run with it and then, at some point "as if by magic", the "why" will dawn on you. It did for me.
9X9

Posts: 100
Joined: 26 September 2005

Thanks for everyone's help. True, once I saw the 4 in r7c6 I was able to figure the rest out.
SuDokuKid

Posts: 31
Joined: 02 November 2005