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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Feb 11, 2010 5:00 am Post subject: Puzzle 10/02/10 (B) |
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XYZ-Wing alert.
| Code: | +-----------------------+
| . . 3 | . . . | . . . |
| . 6 . | . 8 5 | . 3 . |
| 8 . 5 | 3 . . | . . 1 |
|-------+-------+-------|
| . . 4 | 5 . . | . 6 . |
| . 5 . | . . . | 3 4 . |
| . 8 . | . . 2 | 5 . . |
|-------+-------+-------|
| . . . | . 7 8 | 1 . . |
| . 1 . | 6 3 . | . 7 . |
| . . 6 | . . . | . . . |
+-----------------------+
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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: Fri Feb 12, 2010 2:19 am Post subject: |
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Didn't notice any XYZs.
| Quote: | X (2)
W (29)
X (7)
ER (9)
XY (479) |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Feb 12, 2010 8:43 am Post subject: |
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sometimes Danny will show that an elimination of a x-wing candidate will solve the puzzle.
the same thing happens here on the x-wing 7.
here is the proof that the 7 in r2c3 cannot exist, in diagram form...
one of the candidates in r2c7 has to be true
| Code: | (7)r2c7
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(9)r2c7-(9)r13c8=(9)r9c8-(9)r8c79=(9)r8c6-(9)r7c4=(9)r7c3-(9=7)r6c3
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(4)r2c7-(4)r9c7=(4)r9c6-(4)r8c6=(9)r8c6-/ |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Feb 12, 2010 4:51 pm Post subject: |
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Hello Norm. After basics, there doesn't seem to be anything reasonable to crack the puzzle. I see that you and Xsudoku have created a forcing network to attack the X-Wing c29\r26 for <7>. I just completed an upgrade to my chain() routine, and this lengthy chain is the best it could do. (including Eureka notation!)
| Code: | (7=9)r6c3 - r7c3 = r9c12 - (9=8)r9c8 - r1c8 = (8-6)r1c7 = (6-7)r3c7 = (7)r3c2 => r2c3,r4c2<>7
+--------------------------------------------------------------+
| 179 479 3 | 179 24 169 | f6789 e289 5 |
| 1279 6 129-7 | 179 8 5 | 479 3 479 |
| 8 h479 5 | 3 24 69 | g679 29 1 |
|--------------------+--------------------+--------------------|
| 1279 29-7 4 | 5 19 3 | 279 6 8 |
| 6 5 129 | 8 19 7 | 3 4 29 |
| 3 8 a79 | 4 6 2 | 5 1 79 |
|--------------------+--------------------+--------------------|
| 4 3 b29 | 29 7 8 | 1 5 6 |
| 5 1 8 | 6 3 49 | 249 7 249 |
| c279 c279 6 | 129 5 149 | 489 d89 3 |
+--------------------------------------------------------------+
# 65 eliminations remain
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Feb 12, 2010 5:58 pm Post subject: |
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Mine was even longer. 
| Code: | *-----------------------------------------------------------*
| 179 479 3 | 179 24 169 | 6789 289 5 |
| 1279 6 1279 | 179 8 5 | 479 3 479 |
| 8 479 5 | 3 24 69 | 679 29 1 |
|-------------------+-------------------+-------------------|
| 1279 279 4 | 5 19 3 | 279 6 8 |
| 6 5 129 | 8 19 7 | 3 4 29 |
| 3 8 79 | 4 6 2 | 5 1 79 |
|-------------------+-------------------+-------------------|
| 4 3 29 | 29 7 8 | 1 5 6 |
| 5 1 8 | 6 3 49 | 249 7 249 |
| 279 279 6 | 129 5 149 | 489 89 3 |
*-----------------------------------------------------------*
(4)r8c9 = (4-7)r2c9 = (7)r6c9 - (7)r6c3 = (7)r2c3 - (7)r3c2 =
(7-6)r3c7 = (6-8)r1c7 = (8-4)r9c7 = (4)r9c6; r8c6,r9c7<>4
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Feb 12, 2010 6:14 pm Post subject: |
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| very nice both of ya |
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