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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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 Posted: Mon Dec 22, 2014 3:03 pm Post subject: a puzzle from brainbashers |
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| Code: |
+--------------+---------------+-----------+
| 3 58 6 | 258 7 1 | 4 258 9 |
| 589 4589 7 | 2358 4568 346 | 1 258 26 |
| 1 2 458 | 58 4568 9 | 68 7 3 |
+--------------+---------------+-----------+
| 589 3 58 | 7 1 2 | 68 489 46 |
| 4 7 2 | 6 9 8 | 5 3 1 |
| 689 689 1 | 4 3 5 | 2 89 7 |
+--------------+---------------+-----------+
| 2 1 45 | 9 45 7 | 3 6 8 |
| 568 4568 9 | 1358 4568 346 | 7 124 24 |
| 7 468 3 | 18 2 46 | 9 14 5 |
+--------------+---------------+-----------+
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Play this puzzle online at the Daily Sudoku site
This is a partially solved puzzle from brainbashers. As it is Draw/Play grades it very hard but can solve it with three "advanced" moves I agree with them all , but cannot see the "rules" used |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Dec 22, 2014 4:25 pm Post subject: |
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| George, I'd have a much easier time trying this if you'd post the original puzzle. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Dec 22, 2014 7:43 pm Post subject: |
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George -- a good one 
| Code: | *-----------------------------------------------------------*
| 3 58 6 | 258 7 1 | 4 258 9 |
|a589 b4589 7 | 2358 4568 346 | 1 258 26 |
| 1 2 c458 | 58 4568 9 | 68 7 3 |
|-------------------+-------------------+-------------------|
|e58-9 3 d58 | 7 1 2 | 68 489 46 |
| 4 7 2 | 6 9 8 | 5 3 1 |
| 689 689 1 | 4 3 5 | 2 89 7 |
|-------------------+-------------------+-------------------|
| 2 1 45 | 9 45 7 | 3 6 8 |
| 568 4568 9 | 1358 4568 346 | 7 124 24 |
| 7 468 3 | 18 2 46 | 9 14 5 |
*-----------------------------------------------------------*
9r2c1=(9-4)r2c2=(4-8)r3c3=(8-5)r4c3=5r4c1 => -9r4c1; ste |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Mon Dec 22, 2014 10:26 pm Post subject: original puzzle |
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| Code: |
+-------+-------+-------+
| 3 . 6 | . 7 . | 4 . 9 |
| . . 7 | . . . | 1 . . |
| 1 2 . | . . . | . 7 3 |
+-------+-------+-------+
| . . . | 7 1 2 | . . . |
| 4 . . | 6 . 8 | . . 1 |
| . . . | 4 3 5 | . . . |
+-------+-------+-------+
| 2 1 . | . . . | . 6 8 |
| . . 9 | . . . | 7 . . |
| 7 . 3 | . 2 . | 9 . 5 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Dec 23, 2014 1:37 am Post subject: |
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I used four moves, X-Wings on 8 and 4 and XY-Wings on 68-2 and 48-5.
George, I don't understand this sentence: "As it is Draw/Play grades it very hard but can solve it with three "advanced" moves I agree with them all , but cannot see the "rules" used" |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Tue Dec 23, 2014 9:15 am Post subject: notation help please |
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Arkietech gave a solution
9r2c1=(9-4)r2c2=(4-8)r3c3=(8-5)r4c3=5r4c1 => -9r4c1; ste
I thought I Understood the notation but I need a primer on it. Can anyone help? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Dec 23, 2014 12:35 pm Post subject: Re: notation help please |
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| George Woods wrote: | Arkietech gave a solution
9r2c1=(9-4)r2c2=(4-8)r3c3=(8-5)r4c3=5r4c1 => -9r4c1; ste
I thought I Understood the notation but I need a primer on it. Can anyone help? |
If r2c1 is not 9, then r2c2 is a 9 and if that cell is not 4, then r3c3 is a 4 and if it's not an 8 then r4c3 is an 8 and if it's not 5 then r4c1 is a 5.
To summarize, If r2c1 is not a 9, then r4c1 is a 5. if r2 c1 is a 9 then r4c1 cannot be=9.
Hope that helps. |
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