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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Feb 13, 2011 8:26 pm Post subject: Puzzle 11/02/13 |
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| Code: | +-----------------------+
| 1 8 . | . 4 . | . 3 9 |
| 3 . . | . . . | 5 8 4 |
| . . 9 | . 8 . | . 7 . |
|-------+-------+-------|
| . . . | 4 . . | 9 . . |
| 4 . 3 | . 5 7 | . . . |
| . . . | . 2 . | . 4 . |
|-------+-------+-------|
| . 1 . | 2 . . | 7 9 . |
| 9 7 8 | . . 4 | 2 6 . |
| 2 3 . | . . . | . . 8 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Feb 15, 2011 3:43 am Post subject: |
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| Is anyone still working on this puzzle. On further review, the steps seem limited. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Feb 15, 2011 4:41 am Post subject: |
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| I'll be starting it in five minutes. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Feb 15, 2011 6:06 am Post subject: |
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It was a long slog.
ER (6); r4c3<>6
ER (5); r1c4<>5
XY-Chain; r4c8, r5c2<>2
M-Wing (16); r6c6<>1
W-Wing (69); r5c4, r6c2<>9
Coloring; r4c6<>6
BUG+1 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Feb 15, 2011 6:11 pm Post subject: |
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I seldom examine my solver's solution to see if the steps it found are "tight". I checked this puzzle after it sat "idle" for awhile. Then I realized that only one M/W-Wing was indicated present. The same for the Remote Pair.
| Code: | c5b9 turbot fish/ER <> 1 r4c8 needed for M-Wing
c3b8r9 Empty Rectangle <> 5 r1c4 needed for M-Wing
-plus-
c5b7 turbot fish/ER <> 6 r4c3 extraneous
M-Wing: (5=2)r4c8 - r4c3 = (2-5)r1c3 = (5)r9c3 => r9c8<>5 needed for RP
r19 X-Wing <> 5 r3c6 extraneous
RP: (6=5)r3c1 - (5=6)r7c1 - (6=5)r9c3 - (5=6)r9c6 => r3c6<>56
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