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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Mar 19, 2011 2:56 am Post subject: Puzzle 11/03/18: ~ Moderate BBDB |
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| Code: | +-----------------------+
| . . 2 | . 9 8 | . 7 6 |
| . 5 . | 7 . . | . . 1 |
| 8 . . | . 1 . | . 9 . |
|-------+-------+-------|
| . 1 . | 9 . . | . . . |
| 3 . 8 | . . . | 6 4 . |
| 6 . . | . . . | 7 . . |
|-------+-------+-------|
| . . . | . 4 7 | 9 . . |
| 7 . 3 | . 8 . | . 6 . |
| 4 6 . | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Mar 19, 2011 3:41 pm Post subject: |
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Three moderate steps - quite a few extraneous on the way?
| Quote: | xy-wing(47-6) r4c3 ; r2c5<>6
x-wing(5) c3, c5 ; r6c69<>5, r9c4678<>5
xy-wing(59-2) r6c3 ; r4c78<>2 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Mar 19, 2011 5:03 pm Post subject: |
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| peterj wrote: | Three moderate steps - quite a few extraneous on the way?
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I seldom verify how many of the steps reported by my solver are necessary. Sometimes, I'll mark a puzzle BBDB? when I have a feeling that the number of steps can be reduced to four or less. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Mar 20, 2011 6:52 pm Post subject: |
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Like Peter, I found many steps that did not appear to contribute to completing the puzzle. I ultimately found the three stepper posted by Peter and a similar solution starting with an anp(7=34)r13c2.
A fun, interesting puzzle trying to minimize the number of steps needed to finish it off.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Mar 21, 2011 4:37 am Post subject: |
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W-Wing (46); r4c3<>4
ERs, overlapping; r7c9<>25
X-Wing (5); removed a half-dozen 5s
XY-Wing (592); r4c78<>2 |
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