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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Sep 22, 2010 5:57 am Post subject: Puzzle 10/09/22: C |
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This puzzle can be reduced to a state that I'd previously thought was impossible ... then I read the fine print!
| Code: | +-----------------------+
| 9 6 4 | . . . | 7 2 . |
| 2 . . | 1 9 4 | . 6 3 |
| 5 . 1 | 7 6 2 | 9 . 4 |
|-------+-------+-------|
| . 9 2 | . . 6 | . 5 . |
| . 4 5 | . 7 . | . . . |
| . 7 8 | 3 . . | . . . |
|-------+-------+-------|
| 8 . 6 | . . . | 4 . . |
| 7 5 . | 4 . . | . 1 . |
| . 2 9 | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Wed Sep 22, 2010 9:48 am Post subject: |
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| Quote: | X Wing (9)R68 : => r57C69<>9
XY Wing Style (3 strenghts in location, 2 candidates) : 5C5 2B5 2R7 : (5)r7c5=(2)r7c9 : => r7c9<>5 |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Wed Sep 22, 2010 11:41 am Post subject: |
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| JC Van Hay wrote: | | XY Wing Style (3 strenghts in location, 2 candidates) : 5C5 2B5 2R7 : (5)r7c5=(2)r7c9 : => r7c9<>5 |
Why not just write ... (5)r7c5 = (5-2)r6c5 = (2)r4c4 - (2)r7c4 = (2)r7c9 => r7c9<>5
No names to debate and no "strengths" to confuse people. BTW from where did you pick up the "XY Wing Style" name? |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Wed Sep 22, 2010 12:29 pm Post subject: |
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The only think that interest me : the SIS, as in forbidding matrices or logic diagrams (see Allan Barker's), the fundamental basis of all inferences. All other comments are optional !
| ronk wrote: | | BTW from where did you pick up the "XY Wing Style" name? |
From here, but without the "X".
Regards, JC |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Sep 22, 2010 5:47 pm Post subject: |
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[edit: withdrawn.]
Last edited by daj95376 on Wed Sep 22, 2010 10:02 pm; edited 1 time in total |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Sep 22, 2010 6:35 pm Post subject: |
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| daj95376 wrote: | That didn't go over very well.
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I'd rather it had a name! e-turbot is fine for me. While I'm happy to notate everything as AICs, I still like to feel I am looking for named patterns (for no rational reason).
Fwiw, a similar move to JC's is there after basics for a one-stepper (prior knowledge declared!)..
| Code: | | (5=3)r7c5 - (3=8)r1c5 - (8=2)r8c5 - r7c4=r7c9 ; r7c9<>5 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Sep 23, 2010 4:24 am Post subject: |
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X-Wing (9).
Potential DP (37) boxes 89. Either killer (r7c8=9 or r7c6 or r9c6=5) leads to r4c7=1 and r7c5=3. |
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