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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Jan 27, 2011 3:46 am Post subject: Puzzle 11/01/26 Difficult ? |
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| Code: | +-----------------------+
| . 5 4 | 9 . 2 | . 7 . |
| 2 . 8 | . 6 . | . . 4 |
| 9 6 3 | . . 5 | . . 2 |
|-------+-------+-------|
| 8 . . | . 2 . | . 3 . |
| . 3 . | 5 9 . | . . . |
| 5 . 2 | . . 6 | . . 9 |
|-------+-------+-------|
| . . . | . . . | 3 . . |
| 3 . . | 2 . . | . 4 . |
| . 8 5 | . . 9 | . . 7 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Jan 27, 2011 5:50 am Post subject: |
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Type 1 UR
W-Wing
ERs (three)
X-Wing
XY-Chain |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Jan 27, 2011 9:31 am Post subject: |
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A hidden pair move unlocks it... seem to be a powerful technique on harder puzzles.
| Code: | *----------------------------------------------------------------------*
| 1 5 4 | 9 8 2 | 6 7 3 |
| 2 7 8 | 1 6 3 | 59 59 4 |
| 9 6 3 | 47 47 5 | (18) 1(8) 2 |
|----------------------+----------------------+------------------------|
| 8 149 1679 | 47 2 147 | 1457 3 156 |
| 67 3 167 | 5 9 17(48) | 17(48)-2 26 16(8) |
| 5 14 2 | 38 1347 6 | 1478 1(8) 9 |
|----------------------+----------------------+------------------------|
| 467 2 1679 | 68 1457 1478 | 3 59 1568 |
| 3 19 1679 | 2 157 178 | 1589 4 1568 |
| 46 8 5 | 36 134 9 | (12) 26 7 |
*----------------------------------------------------------------------*
hp(48)r5c67=(8)r5c9 - r6c8=r3c8 - (8=1)r3c7 - (1=2)r9c7 ; r5c7<>2 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Jan 27, 2011 5:08 pm Post subject: |
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Marty: Congratulations on this BBDB !!!
Peter: Yes, I'm always surprised at how a Subset can crack so many puzzles. One of these days, I'm going to add it to my solver so I don't have to manually transform a network into something like ...
(via my solver) How about?
| Code: | +-----------------------------------------------------------------------+
| 1 5 4 | 9 8 2 | 6 7 3 |
| 2 7 8 | 1 6 3 | 59 59 4 |
| 9 6 3 | 47 47 5 | 18 18 2 |
|-----------------------+-----------------------+-----------------------|
| 8 149 1679 | 47 2 147 | 1457 3 156 |
| 67 3 167 | 5 9 1478 | 12478 26 168 |
| 5 14 2 | 38 1347 6 | 1478 18 9 |
|-----------------------+-----------------------+-----------------------|
| 467 2 1679 | 68 1457 1478 | 3 59 1568 |
| 3 19 1679 | 2 157 178 | 1589 4 1568 |
| 46 8 5 | 36 134 9 | 12 26 7 |
+-----------------------------------------------------------------------+
# 77 eliminations remain
(8=2)r5c9138 - (2=6)r9c8 - (6=3)r9c4 - (3=8)r6c4 => r6c78<>8
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