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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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 Posted: Tue Jun 26, 2007 12:41 pm Post subject: Trivial but interesting in sat 23rd VH |
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| On this one I found a logic that I have not encountered before. This was at the stage just before the xwings and xy wing : Analyzing box3 we see that 4 is either in cell 1 or 2 by analyzing the row or in cell 2 or8 by analyzng the column. The only cell satisfying both is cell 2 which must be 4. Is this a common move?, 'cos I don't think I have met it before! |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Tue Jun 26, 2007 3:38 pm Post subject: |
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| Could you stick up the grid ? |
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jLo
Joined: 30 Apr 2007
Posts: 55
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| Posted: Tue Jun 26, 2007 4:11 pm Post subject: |
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| Quote: |
On this one I found a logic that I have not encountered before. This was at the stage just before the xwings and xy wing : Analyzing box3 we see that 4 is either in cell 1 or 2 by analyzing the row or in cell 2 or8 by analyzng the column. The only cell satisfying both is cell 2 which must be 4. Is this a common move?, 'cos I don't think I have met it before!
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| Code: |
+--------------+-------------+--------------+
| 26 | | 246 246 |
| 124 | 24 | 124 |
| 124 1246 | 24 | 1246 |
+--------------+-------------+--------------+
| 56 | 15 | 16 |
| 23 2356 | 24 259 246 | 49 |
| 26 | 129 1246 | 146 149 |
+--------------+-------------+--------------+
| | 12 | 124 14 |
| 12 12 | | |
| 1234 1234 | 12 | 124 |
+--------------+-------------+--------------+
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I think this is just simple row/column lockout.
4 in row 1 must be in Box 3, eliminating 4 from R3c8 (and R2C7)
4 in Box 7 must be in Row 9, eliminating 4 from R9C8
That leaves a single 4 in column 8 - R1C8=4 |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Tue Jun 26, 2007 10:08 pm Post subject: row/column lockout. |
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| thanks :- As I said I do not remeber having met it before andso did not have a convenient description but " row/column lockout." seems to do the job! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jun 27, 2007 12:37 am Post subject: |
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| That's a new term to me, "row/column lockout." It's more commonly known as "locked candidates" or "box-line reduction." |
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