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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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 Posted: Wed Dec 08, 2010 6:11 pm Post subject: Krampus Edition - "XY Chain" #2 |
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| Code: | *-----------*
|23.|7..|...|
|.6.|...|.4.|
|8.7|2.1|...|
|---+---+---|
|1..|...|4..|
|7..|8.6|..3|
|..2|...|..8|
|---+---+---|
|...|5.3|8.4|
|.2.|...|.5.|
|...|..2|.76|
*-----------* |
| Code: | | 230700000060000040807201000100000400700806003002000008000503804020000050000002076 |
(c) Helmut Saueregger |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Dec 09, 2010 9:28 am Post subject: |
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As the man says - an xy-chain ...
| Code: | (3=9)r2c4 - (9=5)r2c1 - (5=3)r9c1 - (3=6)r6c1 - (6=3)r4c3 ; r4c4<>3
BUG+1 ; r5c2=4 |
Probably other xy-chains that one-step it - a sea of bivalues! |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Dec 09, 2010 2:38 pm Post subject: |
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| peterj wrote: | | Probably other xy-chains that one-step it - a sea of bivalues! |
None that my solver found. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 10, 2010 1:36 am Post subject: |
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| daj95376 wrote: | | peterj wrote: | | Probably other xy-chains that one-step it - a sea of bivalues! |
None that my solver found. |
Should I do this again? There was simple coloring; r5c5<>4
Or a chain running from r1c3 to r5c5; r5c3<>4
| Code: |
+----------+-----------+----------+
| 2 3 49 | 7 6 45 | 1 8 59 |
| 5 6 1 | 3 9 8 | 27 4 27 |
| 8 49 7 | 2 45 1 | 6 3 59 |
+----------+-----------+----------+
| 1 8 3 | 9 25 57 | 4 6 257 |
| 7 459 49 | 8 245 6 | 25 1 3 |
| 6 45 2 | 1 3 457 | 57 9 8 |
+----------+-----------+----------+
| 9 7 6 | 5 1 3 | 8 2 4 |
| 4 2 8 | 6 7 9 | 3 5 1 |
| 3 1 5 | 4 8 2 | 9 7 6 |
+----------+-----------+----------+
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Play this puzzle online at the Daily Sudoku site |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 10, 2010 2:21 am Post subject: |
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| Marty R. wrote: | Should I do this again? There was simple coloring; r5c5<>4
Or a chain running from r1c3 to r5c5; r5c3<>4
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I was unable to locate a chain for r5c3<>4. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 10, 2010 2:42 am Post subject: |
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Danny, If my grid is not in error:
R1c3=9-->r1c9=5-->r1c6=4-->r3c5=5-->r4c5=2-->r5c5=4; r5c3<>4. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 10, 2010 2:53 am Post subject: |
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| Marty R. wrote: | Danny, If my grid is not in error:
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Marty, your grid is correct. I'm still trying to determine how you reached it from here:
| Code: | after basics
+--------------------------------------------------------------+
| 2 3 *459 | 7 4569 *459 | 169 8 159 |
| 59 6 1 | 39 3589 589 | 27 4 27 |
| 8 459 7 | 2 4569 1 | 69 3 59 |
|--------------------+--------------------+--------------------|
| 1 8 36 | 39 257 57 | 4 69 27 |
| 7 459 *459 | 8 29-4 6 | 25 1 3 |
| 36 59-4 2 | 1 3479 *479 | 57 69 8 |
|--------------------+--------------------+--------------------|
| 69 7 69 | 5 1 3 | 8 2 4 |
| 4 2 38 | 6 789 789 | 139 5 19 |
| 35 1 358 | 4 89 2 | 39 7 6 |
+--------------------------------------------------------------+
# 66 eliminations remain
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Only the Skyscraper on <4> is present (and indicated) at this point. What was your next step? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 10, 2010 4:45 am Post subject: |
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| I have no idea Danny. I'd have to do it again. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 10, 2010 5:43 am Post subject: |
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I did it again, this time on Draw/Play and got your grid. At the rate I'm making errors I think every puzzle should be done through basics on D/P, then xx to P&P for the rest, having already eliminated many of the mechanical errors. I'm posting too many erroneous grids.  |
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