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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Mon Aug 31, 2009 3:02 am Post subject: Aug 31 VH |
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The last day of August brings a tardy VH with a multiple choice of single bullets.
Solutions: xy-wing (239), color (5), or UR (12) demands that R5C8=2.
Early Earl |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Mon Aug 31, 2009 11:57 am Post subject: |
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Here is the grid after basics. xy wing solved it for me.
| Code: |
+------------+-------------+------------+
| 6 39 89 | 45 2 34 | 358 7 1 |
| 7 4 1 | 8 35 9 | 35 6 2 |
| 2 5 38 | 1 7 6 | 38 4 9 |
+------------+-------------+------------+
| 1 237 235 | 245 3458 34 | 6 9 78 |
| 35 237 6 | 9 358 1 | 4 25 78 |
| 9 8 4 | 257 6 57 | 12 125 3 |
+------------+-------------+------------+
| 8 29 259 | 6 1 57 | 27 3 4 |
| 45 1 7 | 3 45 2 | 9 8 6 |
| 34 6 23 | 47 9 8 | 127 12 5 |
+------------+-------------+------------+
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Play this puzzle online at the Daily Sudoku site |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Aug 31, 2009 12:18 pm Post subject: |
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| For me a: |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Mon Aug 31, 2009 2:06 pm Post subject: yet another soltn |
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| The W wing on 35 traps 3s on line 5 in box 4, opening up another XY wing! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 31, 2009 3:35 pm Post subject: |
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| I monkeyed around with the potential 37-38-78 DP in band 2. Every way to kill the DP forces the solution to box 2. |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Mon Aug 31, 2009 11:22 pm Post subject: |
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| Marty R. wrote: | | I monkeyed around with the potential 37-38-78 DP in band 2. Every way to kill the DP forces the solution to box 2. |
Marty, are these DPs called MUGs or BUGs or what? They're starting to make sense to me, whatever they're called!
| Code: | +------------+-------------+------------+
| 6 *39 89 | 45 2 -34 | 358 7 1 |
| 7 4 1 | 8 *35 9 | 35 6 2 |
| 2 5 38 | 1 7 6 | 38 4 9 |
+------------+-------------+------------+
| 1 237 235 | 245 3458 34 | 6 9 78 |
| 35 237 6 | 9 358 1 | 4 25 78 |
| 9 8 4 | 257 6 57 | 12 125 3 |
+------------+-------------+------------+
| 8 29 259 | 6 1 57 | 27 3 4 |
| 45 1 7 | 3 45 2 | 9 8 6 |
| 34 6 23 | 47 9 8 | 127 12 5 |
+------------+-------------+------------+ |
You're sayin a 3 would have to be in at least one of the marked cells or there'd be the DP, meaning r1c6<>3. Seems one could also use 3r1c2=3r2c5 in an AIC, if it was needed. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Sep 01, 2009 12:20 am Post subject: |
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| Luke451 wrote: | | Marty R. wrote: | | I monkeyed around with the potential 37-38-78 DP in band 2. Every way to kill the DP forces the solution to box 2. |
Marty, are these DPs called MUGs or BUGs or what? They're starting to make sense to me, whatever they're called!
| Code: | +------------+-------------+------------+
| 6 *39 89 | 45 2 -34 | 358 7 1 |
| 7 4 1 | 8 *35 9 | 35 6 2 |
| 2 5 38 | 1 7 6 | 38 4 9 |
+------------+-------------+------------+
| 1 237 235 | 245 3458 34 | 6 9 78 |
| 35 237 6 | 9 358 1 | 4 25 78 |
| 9 8 4 | 257 6 57 | 12 125 3 |
+------------+-------------+------------+
| 8 29 259 | 6 1 57 | 27 3 4 |
| 45 1 7 | 3 45 2 | 9 8 6 |
| 34 6 23 | 47 9 8 | 127 12 5 |
+------------+-------------+------------+ |
You're sayin a 3 would have to be in at least one of the marked cells or there'd be the DP, meaning r1c6<>3. Seems one could also use 3r1c2=3r2c5 in an AIC, if it was needed. |
BUGs, usually BUG+1 or BUG+2, refer to a grid when every unsolved cell is bivalued, except for the number of cells after the BUG+. I don't know about MUGs.
As to my DP, in my simple world one of the following five conditions must be true:
R4c2=2
R5c2=2
R4c5=4
R4c5=5
R5c5=5
Every one of those possibilities leads to the same solution for box 2. |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Tue Sep 01, 2009 2:10 am Post subject: |
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| arkietech wrote: | | For me a: |
Very good. I seldom ever recognize a skyscraper. I found one after you posted your solution. The fives in columns 3, 6 (* marks the cells) remove the 5s (r marks the cells) in the top row of box 5, and the puzzle is resolved. Cool. It would not shock me if there is some other skyscraper in there.
| Code: |
+------------+-------------+------------+
| 6 39 89 | 45 2 34 | 358 7 1 |
| 7 4 1 | 8 35 9 | 35 6 2 |
| 2 5 38 | 1 7 6 | 38 4 9 |
+------------+-------------+------------+
| 1 237*235 |r245r3458 34 | 6 9 78 |
| 35 237 6 | 9 358 1 | 4 25 78 |
| 9 8 4 | 257 6 *57 | 12 125 3 |
+------------+-------------+------------+
| 8 29 *259 | 6 1 *57 | 27 3 4 |
| 45 1 7 | 3 45 2 | 9 8 6 |
| 34 6 23 | 47 9 8 | 127 12 5 |
+------------+-------------+------------+
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Play this puzzle online at the Daily Sudoku site |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Tue Sep 01, 2009 7:40 pm Post subject: |
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| Luke451 wrote: |
Marty, are these DPs called MUGs or BUGs or what? They're starting to make sense to me, whatever they're called! |
Bug Lite. |
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