I can't get this tho I've been hooked for 6 months

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I can't get this tho I've been hooked for 6 months

Postby smurfdaddy » Sun Jun 18, 2006 8:17 pm

I have been doing S for about 6 months. I guess I understand some advanced techniques but get lost when I read Angus explaining x wings and swordfish. Can't solve this with my skill level. Any tip would be great (I'm probably missing an obvious double or something. Sorry about the sloppy chart.

3 248 128 48 124 9 6 7 5
1247 5 1278 6 124 28 9 3 128
6 289 1289 5 7 3 12 18 4


1257 2378 12578 9 68 4 12357 156 1237
47 3479 6 2 5 1 8 49 379
1245 2489 12589 3 68 7 1245 14569 129


8 27 257 147 9 6 13457 145 137
79 6 4 178 3 5 17 2 89
579 1 3 478 24 28 457 89 6:?: [/list]
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Postby keith » Sun Jun 18, 2006 9:27 pm

You are not missing any obvious basic move, or even one of the most popular "advanced" moves. This needs a chain.
Code: Select all
+-------------------+-------------------+-------------------+
| 3     248   128   | 48    124   9     | 6     7     5     |
| 1247  5     1278  | 6     124   28a   | 9     3     128c  |
| 6     289   1289  | 5     7     3     | 12    18    4     |
+-------------------+-------------------+-------------------+
| 1257  2378  12578 | 9     68    4     | 12357 156   1237  |
| 47    3479  6     | 2     5     1     | 8     49    379   |
| 1245  2489  12589 | 3     68    7     | 1245  14569 129   |
+-------------------+-------------------+-------------------+
| 8     27    257   | 147   9     6     | 13457 145   137   |
| 79    6     4     | 178   3     5     | 17    2     89d   |
| 579   1     3     | 478   24    28b   | 457   89e   6     |
+-------------------+-------------------+-------------------+

There is a solution via "strong links" or "multi-coloring". Look at C6 and C9. They each contain only two candidates for <8>.

One or both of the cells labeled "b" and "d" must be <8>. Think about it! (If neither of them is <8>, both "a" and "c" must be <8>, a contradiction.)

So, R9C8 ("e") cannot be <8>, it must be <9>, and this solves the puzzle.

This pattern is sometimes called a "fork". It is two strong links that almost form an X-wing.

Best wishes,

Keith
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Posts: 209
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Postby Crazy Girl » Sun Jun 18, 2006 9:38 pm

smurfdaddy,

to summarise here is where you are stuck.

Code: Select all
----------------+-------------+------------------|
3    248  128   | 48  124 9   | 6     7     5    |
1247 5    1278  | 6   124 28* | 9     3     128A |
6    289  1289  | 5   7   3   | 12    18B   4    |
----------------+-------------+------------------|
1257 2378 12578 | 9  68   4   | 12357 156   1237 |
47   3479 6     | 2   5   1   | 8     49    379  |
1245 2489 12589 | 3  68   7   | 1245  14569 129  |
----------------+-------------+------------------|
8    27   257   | 147 9   6   | 13457 145   137  |
79   6    4     | 178 3   5   | 17    2     89B  |
579  1    3     | 478 24  28* | 457   89A   6    |
----------------+-------------+------------------|


looking at the 8's...there is only two cells in the same two columns in block 3 and in block 9 that contain 8, so applying colouring starting at R9C8 if the A's are true then there is no place for a 8 in column 6 so therefore all the A cells can't contain a 8 as a candidate so this means the B cells are 8.

:)
Last edited by Crazy Girl on Mon Jun 19, 2006 6:38 am, edited 1 time in total.
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Posts: 189
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thanks to Keith and 'crazy girl" no wonder I'm addicted

Postby smurfdaddy » Sun Jun 18, 2006 11:51 pm

keith wrote:You are not missing any obvious basic move, or even one of the most popular "advanced" moves. This needs a chain.
Code: Select all
+-------------------+-------------------+-------------------+
| 3     248   128   | 48    124   9     | 6     7     5     |
| 1247  5     1278  | 6     124   28a   | 9     3     128c  |
| 6     289   1289  | 5     7     3     | 12    18    4     |
+-------------------+-------------------+-------------------+
| 1257  2378  12578 | 9     68    4     | 12357 156   1237  |
| 47    3479  6     | 2     5     1     | 8     49    379   |
| 1245  2489  12589 | 3     68    7     | 1245  14569 129   |
+-------------------+-------------------+-------------------+
| 8     27    257   | 147   9     6     | 13457 145   137   |
| 79    6     4     | 178   3     5     | 17    2     89d   |
| 579   1     3     | 478   24    28b   | 457   89e   6     |
+-------------------+-------------------+-------------------+

There is a solution via "strong links" or "multi-coloring". Look at C6 and C9. They each contain only two candidates for <8>.

One or both of the cells labeled "b" and "d" must be <8>. Think about it! (If neither of them is <8>, both "a" and "c" must be <8>, a contradiction.)

So, R9C8 ("e") cannot be <8>, it must be <9>, and this solves the puzzle.

This pattern is sometimes called a "fork". It is two strong links that almost form an X-wing.

Best wishes,

Keith
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Posts: 8
Joined: 03 June 2006

I can't get this tho I've been hooked for 6 months

Postby Cec » Mon Jun 19, 2006 3:02 pm

Hi smurfdaddy,

I see you're new to the Forum and it seems like you need a little help to post messages and puzzles. To see how I've posted this message just click on the "quote" display button at the top right corner of the message you're now reading.

Note that this message is typed in the larger message window box and not the narrow display box at the top which is where your subject matter is typed in.

The procedures for posting puzzles is described by clicking on Here

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