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| Clifford
| | Joined: 25 Jan 2007 | | Posts: 2 | | : | |
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 Posted: Tue Feb 06, 2007 4:16 am Post subject: Stumped |
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4x3x218x6
2x76389xx
x86x54x2x
574362198
xx9875462
862149xx5
x4521768x
7x15862xx
628493517
I am stuck at this point. Can someone tell me what the next step is
and explain why? Thank you.
Clifford |
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| daj95376
| | Joined: 05 Feb 2006 | | Posts: 349 | | : | |
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| Posted: Tue Feb 06, 2007 6:34 am Post subject: |
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| Code: | *-----------*
|4.3|.21|8.6|
|2.7|638|9..|
|.86|.54|.2.|
|---+---+---|
|574|362|198|
|..9|875|462|
|862|149|..5|
|---+---+---|
|.45|217|68.|
|7.1|586|2..|
|628|493|517|
*-----------*
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| Code: | # XY-Wing at [r3c1] => [r7c9]<>3
# Singles complete puzzle
*--------------------------------------------------*
| 4 59 3 | 79 2 1 | 8 57 6 |
| 2 15 7 | 6 3 8 | 9 45 14 |
|*19 8 6 | 79 5 4 | 37 2 *13 |
|----------------+----------------+----------------|
| 5 7 4 | 3 6 2 | 1 9 8 |
| 13 13 9 | 8 7 5 | 4 6 2 |
| 8 6 2 | 1 4 9 | 37 37 5 |
|----------------+----------------+----------------|
|*39 4 5 | 2 1 7 | 6 8 9-3 |
| 7 39 1 | 5 8 6 | 2 34 349 |
| 6 2 8 | 4 9 3 | 5 1 7 |
*--------------------------------------------------*
|
www.Sudopedia.org to learn more about XY-Wing. |
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| Carcul
| | Joined: 29 Dec 2005 | | Posts: 50 | | : | | Location: Coimbra, Portugal |
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| Posted: Fri Feb 16, 2007 11:02 am Post subject: |
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We also have here a trivial BUG+1: r8c9 must be "3", otherwise the puzzle would have more than one solution.
Carcul |
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