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ravel
Joined: 21 Apr 2006
Posts: 536
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 Posted: Fri Jan 25, 2008 1:39 pm Post subject: Small and slippery |
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... at the end
| Code: | +-------------------+
| . 1 . . . . . . . |
| . . 3 . . . . . . |
| . 2 . 9 . . 6 7 . |
| . . . 6 . 5 . . 1 |
| . 3 . 4 . 7 . . . |
| . . 7 . . . 3 2 . |
| 7 4 . . . . . . 6 |
| . . . . . 2 . . 3 |
| . . . . . . 5 9 . |
+-------------------+
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>>> play online |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Jan 25, 2008 6:08 pm Post subject: |
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there was a small/slippery finned thingy quite early (giving 4<>r2c1), but since ravel said near the end I hesitated to use it. Instead ...
coloring on 4:-r1c7=r8c7-r8c8=r4c8-r4c3=r6c1-; r1c1<>4
xy-chain and w-wing here:
| Code: |
+--------------------------+--------------------------+--------------------------+
| 689 1 4689 | 57 57 468 | 489 3 2 |
| 4689 7 3 | 2 468 468 | 1 5 489 |
| 458 2 458 | 9 1 3 | 6 7 48 |
+--------------------------+--------------------------+--------------------------+
| 2 -89 489 | 6 3 5 | 7 @48 1 |
| 158 3 158 | 4 2 7 | 89 6 589 |
| 456 @56 7 | #18 #89 18-9 | 3 2 @45 |
+--------------------------+--------------------------+--------------------------+
| 7 4 1589 | 3 58-9 #89 | 2 18 6 |
| 15689 5689 15689 | 57 5678-9 2 | 48 148 3 |
| 3 @68 2 | #18 468 1468 | 5 9 7 |
+--------------------------+--------------------------+--------------------------+ |
much later
| Code: | +--------------------------+--------------------------+--------------------------+
| 689 1 69 | 57 57 468 | 489 3 2 |
| 4689 7 3 | 2 468 468 | 1 5 489 |
| 458 2 458 | 9 1 3 | 6 7 48 |
+--------------------------+--------------------------+--------------------------+
| 2 9 48 | 6 3 5 | 7 48 1 |
| 158 3 158 | 4 2 7 | 89 6 589 |
| 456 56 7 | 18 9 18 | 3 2 45 |
+--------------------------+--------------------------+--------------------------+
| 7 4 15 | 3 58 9 | 2 18 6 |
| 1569 568 69 | 57 5678 2 | 48 148 3 |
| 3 68 2 | 18 468 1468 | 5 9 7 |
+--------------------------+--------------------------+--------------------------+ |
again coloring on 4: -r3c3=r4c3-r4c8=r6c9-; r3c9<>4
then, right near the end:
| Code: |
+--------------------------+--------------------------+--------------------------+
| 689 1 69 | 57 57 468 | 49 3 2 |
| 689 7 3 | 2 468 468 | 1 5 49 |
| 45 2 45 | 9 1 3 | 6 7 8 |
+--------------------------+--------------------------+--------------------------+
| 2 9 48 | 6 3 5 | 7 48 1 |
| 15 3 158 | 4 2 7 | 89 6 59 |
| 456 56 7 | 18 9 18 | 3 2 45 |
+--------------------------+--------------------------+--------------------------+
| 7 4 15 | 3 58 9 | 2 18 6 |
| 1569 568 69 | 57 5678 2 | 48 148 3 |
| 3 68 2 | 18 468 1468 | 5 9 7 |
+--------------------------+--------------------------+--------------------------+
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an xyz-wing '4 5 6 '(r6c1),'5 6 '(r6c2),'4 5 '(r3c1) removes 5 from r5c1
no more slippery stuff. And I did not use the UR 57 throughout. |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Sat Jan 26, 2008 4:51 pm Post subject: |
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Just not to let someone look for something not existing here:
I used the (simple type) UR(s) and the slippery thingy is a grouped turbot fish (2 strong links, where one is "grouped", i.e. between one and 2 cells) |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Sat Jan 26, 2008 4:58 pm Post subject: small |
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This is where I got stuck. Hint please?
Earl
| Code: |
+-------------------+------------------+--------------+
| 45689 1 45689 | 578 45678 468 | 489 3 2 |
| 4689 7 3 | 2 468 468 | 1 5 489 |
| 458 2 458 | 9 1 3 | 6 7 48 |
+-------------------+------------------+--------------+
| 2 89 489 | 6 3 5 | 7 48 1 |
| 1589 3 1589 | 4 2 7 | 89 6 589 |
| 145689 5689 7 | 18 89 189 | 3 2 4589 |
+-------------------+------------------+--------------+
| 7 4 1589 | 3 589 189 | 2 18 6 |
| 15689 5689 15689 | 1578 456789 2 | 48 148 3 |
| 3 68 2 | 18 468 1468 | 5 9 7 |
+-------------------+------------------+--------------+
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Play this puzzle online at the Daily Sudoku site |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Sat Jan 26, 2008 5:10 pm Post subject: |
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| A pair in column 4, a triple in box 2, then a couple of locked candidates. |
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