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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Fri Jul 07, 2017 3:04 pm Post subject: July 07 VH |
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No one having posted, I offer my clumsy solution.
157xywing@R2C2,-5R9C3;
7xwingC2,7, -7R2C8;
128 xyzwing@R1C6, -1R1C4
Surely someone can do better than this!
Early Earl |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Fri Jul 07, 2017 3:57 pm Post subject: |
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Hi everyone
| Code: |
+---------------+--------------+--------------+
| 125 9 3 | 14 7 1268 | 58 246 458 |
| 6 17 4 | 5 38 128 | 378 27 9 |
| 25 8 57 | 349 346 269 | 357 2467 1 |
+---------------+--------------+--------------+
| 49 6 579 | 8 1 3 | 2 47 45 |
| 48 3 18 | 2 5 7 | 16 9 46 |
| 15 157 2 | 6 9 4 | 157 8 3 |
+---------------+--------------+--------------+
| 7 2 19 | 34 34 19 | 68 5 68 |
| 3 4 68 | 7 68 5 | 9 1 2 |
| 89 15 15689 | 19 2 68 | 4 3 7 |
+---------------+--------------+--------------+
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Play this puzzle online at the Daily Sudoku site
Solution with one step
[(5-1)R6C1=1R1C1-(1)R1C4 and (5)R6C1-(5)R13C1=(5-7)R3C3=(7)R4C3-(7=4)R4C8-(4)R13C8=(4)R1C9-(4)R1C4]=> contradiction R1C4=Ø =>-5R6C1=>solution stte.
Ciao a tutti
Paolo |
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dongrave
Joined: 06 Mar 2014
Posts: 564
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| Posted: Fri Jul 07, 2017 11:58 pm Post subject: Re: July 07 VH |
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| Earl wrote: | No one having posted, I offer my clumsy solution.
157xywing@R2C2,-5R9C3;
7xwingC2,7, -7R2C8;
128 xyzwing@R1C6, -1R1C4
Surely someone can do better than this!
Early Earl |
Clumsy? That was the only solution that I could find using just X, XY, and/or XYZ Wings! And if it's the only one, then that's my 'preferred' solution! That was a great one! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jul 08, 2017 12:10 am Post subject: |
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| Code: | +---------------+--------------+--------------+
| 125 9 3 | 14 7 1268 | 58 246 458 |
| 6 17 4 | 5 38 128 | 378 27 9 |
| 25 8 57 | 349 346 269 | 357 2467 1 |
+---------------+--------------+--------------+
| 49 6 579 | 8 1 3 | 2 47 45 |
| 48 3 18 | 2 5 7 | 16 9 46 |
| 15 157 2 | 6 9 4 | 157 8 3 |
+---------------+--------------+--------------+
| 7 2 19 | 34 34 19 | 68 5 68 |
| 3 4 68 | 7 68 5 | 9 1 2 |
| 89 15 15689 | 19 2 68 | 4 3 7 |
+---------------+--------------+--------------+ |
Using Paolo's grid. There is a 19-8 XY-Wing pivoted in r7c3=> -8r5c1,r89c3.I don't know if that step is enough, but if not, certainly seems to make a good dent. |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Sat Jul 08, 2017 11:03 am Post subject: |
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Hi everyone
| Code: |
+---------------+--------------+--------------+
| 125 9 3 | 14 7 1268 | 58 246 458 |
| 6 17 4 | 5 38 128 | 378 27 9 |
| 25 8 57 | 349 346 269 | 357 2467 1 |
+---------------+--------------+--------------+
| 49 6 579 | 8 1 3 | 2 47 45 |
| 48 3 18 | 2 5 7 | 16 9 46 |
| 15 157 2 | 6 9 4 | 157 8 3 |
+---------------+--------------+--------------+
| 7 2 19 | 34 34 19 | 68 5 68 |
| 3 4 68 | 7 68 5 | 9 1 2 |
| 89 15 15689 | 19 2 68 | 4 3 7 |
+---------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
.
Another solution with one step
[(1)R1C1-(1=4)R1C4-(4)R1C89=(4)R3C8-(4)R4C8 and (1)R1C1-(1=5)R6C1-(5)R13C1=(5-7)R3C3=(7)R4C3-(7)R4C8] ]=> contradiction R4C8=Ø =>-1R1C1=>solution stte.
Ciao a tutti
Paolo |
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dongrave
Joined: 06 Mar 2014
Posts: 564
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| Posted: Sat Jul 08, 2017 1:27 pm Post subject: |
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| Marty R. wrote: |
Using Paolo's grid. There is a 19-8 XY-Wing pivoted in r7c3=> -8r5c1,r89c3.I don't know if that step is enough, but if not, certainly seems to make a good dent. |
Hey! I missed that Marty! Nice one. It looks like that solves the same number of cells as Earl's first XY Wing so the other two steps look like they're still required. Thanks, Don. |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Sat Jul 08, 2017 5:49 pm Post subject: |
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Hi everyone
| Code: |
+---------------+--------------+--------------+
| 125 9 3 | 14 7 1268 | 58 246 458 |
| 6 17 4 | 5 38 128 | 378 27 9 |
| 25 8 57 | 349 346 269 | 357 2467 1 |
+---------------+--------------+--------------+
| 49 6 579 | 8 1 3 | 2 47 45 |
| 48 3 18 | 2 5 7 | 16 9 46 |
| 15 157 2 | 6 9 4 | 157 8 3 |
+---------------+--------------+--------------+
| 7 2 19 | 34 34 19 | 68 5 68 |
| 3 4 68 | 7 68 5 | 9 1 2 |
| 89 15 15689 | 19 2 68 | 4 3 7 |
+---------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
Another solution with one step
forcing chain [(1-4)R1C4=(4)R3C45-(4)R3C8; (1)R1C4-(1)R1C1=(1-7)R2C2=(7)R3C3-(7)R3C8; (1)R1C4-(1=9)R9C4-(9=8)R9C1-(8=6)R9C6-(6)R1C6)=(6)R1C8-(6)R3C8] =>R3C8=2
and (1)R1C4-(1)R1C1=(1-7)R2C2=(7)R3C3-(7)R4C4=(7)R4C8-(7=2)R2C8 =>R2C8=2.
(R2C8=2 and R3C8=2)=>contradiction two singles 2 in box 3 or in column 8=>-1R1C4 solution stte.
Ciao a tutti
Paolo |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Sat Jul 08, 2017 11:04 pm Post subject: |
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Hi everyone
| Code: |
+---------------+--------------+--------------+
| 125 9 3 | 14 7 1268 | 58 246 458 |
| 6 17 4 | 5 38 128 | 378 27 9 |
| 25 8 57 | 349 346 269 | 357 2467 1 |
+---------------+--------------+--------------+
| 49 6 579 | 8 1 3 | 2 47 45 |
| 48 3 18 | 2 5 7 | 16 9 46 |
| 15 157 2 | 6 9 4 | 157 8 3 |
+---------------+--------------+--------------+
| 7 2 19 | 34 34 19 | 68 5 68 |
| 3 4 68 | 7 68 5 | 9 1 2 |
| 89 15 15689 | 19 2 68 | 4 3 7 |
+---------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
Another solution with one step
forcing chain [(4-7)R4C8=(7)R4C3-(7=5)R3C3-(5)R13C1 and (4)R4C8-(4)R13C8=(4)R1C9-(4=1)R1C4-(1)R1C1]=> contradiction Two singles 2 iin box 1 or in column 1=>-4R4C8=> solution stte.
Ciao a tutti
Paolo |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Sun Jul 09, 2017 8:55 pm Post subject: |
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Hi everyone
| Code: |
+---------------+--------------+--------------+
| 125 9 3 | 14 7 1268 | 58 246 458 |
| 6 17 4 | 5 38 128 | 378 27 9 |
| 25 8 57 | 349 346 269 | 357 2467 1 |
+---------------+--------------+--------------+
| 49 6 579 | 8 1 3 | 2 47 45 |
| 48 3 18 | 2 5 7 | 16 9 46 |
| 15 157 2 | 6 9 4 | 157 8 3 |
+---------------+--------------+--------------+
| 7 2 19 | 34 34 19 | 68 5 68 |
| 3 4 68 | 7 68 5 | 9 1 2 |
| 89 15 15689 | 19 2 68 | 4 3 7 |
+---------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
Another solution with one step
forcing chain [(7)R6C7-(7=4)R4C8-(4)R13C8=(4)R1C9-R1C4 and (7)R6C7-(7)R4C8=(7)R4C3-(7)R3C3=(7-1)R2C2=(1)R1C1-(1)R1C4]=> contradiction R1C4=Ø=>-7R6C7=> solution stte.
Ciao a tutti
Paolo |
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