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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Sat Sep 05, 2015 5:29 am Post subject: sep 5 VH |
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| Code: |
+-------------+------------+---------+
| 6 25 9 | 4 15 8 | 3 7 12 |
| 8 24 14 | 7 13 123 | 9 5 6 |
| 3 257 17 | 25 6 9 | 4 8 12 |
+-------------+------------+---------+
| 1 8 247 | 25 345 237 | 6 9 57 |
| 57 3 26 | 68 9 12 | 18 4 57 |
| 457 9 467 | 68 145 17 | 18 2 3 |
+-------------+------------+---------+
| 47 47 5 | 1 8 6 | 2 3 9 |
| 2 6 3 | 9 7 4 | 5 1 8 |
| 9 1 8 | 3 2 5 | 7 6 4 |
+-------------+------------+---------+
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Play this puzzle online at the Daily Sudoku site |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Sat Sep 05, 2015 9:51 am Post subject: |
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After Basics: | Code: |
+-------------+------------+---------+
| 6 25 9 | 4 15 8 | 3 7 12 |
| 8 24 124 | 7 13 123 | 9 5 6 |
| 3 257 127 | 25 6 9 | 4 8 12 |
+-------------+------------+---------+
| 1 8 247 | 25 345 237 | 6 9 57 |
| 57 3 26 | 68 19 12 | 18 4 57 |
| 457 9 467 | 68 145 17 | 18 2 3 |
+-------------+------------+---------+
| 47 47 5 | 1 8 6 | 2 3 9 |
| 2 6 3 | 9 7 4 | 5 1 8 |
| 9 1 8 | 3 2 5 | 7 6 4 |
+-------------+------------+---------+
|
Play this puzzle online at the Daily Sudoku site
I suspect Marty didn't give the simple 25-1 XY wing solution to this
(pivot r1c9 or r3c9) due to continuing ennui at the humdrum nature of
recent VHs. I don't suppose the similarly trivial w-wing on 25 r13 would
have been enough to excite him either......
Hugh |
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bat999
Joined: 09 Jul 2015
Posts: 55
Location: UK
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| Posted: Sat Sep 05, 2015 12:37 pm Post subject: |
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| Code: | .----------------.-----------------.------------.
| 6 5-2 9 | 4 c15 8 | 3 7 d12 |
| 8 a24 14 | 7 13 b123 | 9 5 6 |
| 3 257 17 | c25 6 9 | 4 8 12 |
:----------------+-----------------+------------:
| 1 8 247 | 25 345 237 | 6 9 57 |
| 57 3 26 | 68 9 12 | 18 4 57 |
| 457 9 467 | 68 145 17 | 18 2 3 |
:----------------+-----------------+------------:
| 47 47 5 | 1 8 6 | 2 3 9 |
| 2 6 3 | 9 7 4 | 5 1 8 |
| 9 1 8 | 3 2 5 | 7 6 4 |
'----------------'-----------------'------------' |
(2)r2c2 = r2c6 - (2=1)r1c5,r3c4 - (1=2)r1c9 => -2 r1c2; stte
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Sep 05, 2015 2:23 pm Post subject: |
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| Correct, Hugh, recent puzzles are definitely ennui-inducing. I saw pivots for that wing at r1c5 and r3c4, but still looking at r13c9. I didn't notice the W-Wing. |
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RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
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| Posted: Wed Sep 09, 2015 6:39 pm Post subject: |
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I'm not "ennui"ed at any of the Sudoku daily puzzles.
With "easy" and "medium" I challenge myself by seeking a kind of mathematical proof of a solution with the minimum number of steps. To me, by definition, "easy" and "medium" are puzzles that don't require pencil marking. There is some overlap, but generally "medium" requires finding at least one sole candidate.
Occasionally a "hard" can be solved without pencil marking.
I like it when a puzzle needs more than one step. I work on printed copies of the puzzle, and if I need to use x such copies it's an x-step puzzle. To me, this puzzle was a two-step puzzle.
Everybody seems to dismiss all "hard" steps as "basics". I don't. To me, this puzzle is a 2-stepper: the siamese twin xy wing 125 isn't available until the pair 25 in column 4 is found (as a "hard" step).
By the way, I was pleased to see Marty’s correction of Hugh’s misstatement of what the 2 alternative pivots were! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Sep 09, 2015 8:12 pm Post subject: |
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| Quote: |
Everybody seems to dismiss all "hard" steps as "basics". |
Robert, I don't see it as dismissive. There is a generally accepted definition of basics (subsets and locked candidates), while all other moves are defined as advanced. These puzzles are constructed so that Hards do not require advanced moves. And to ward off a discussion, most people would agree that some "advanced" moves are extremely simple. |
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