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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Sat Feb 06, 2010 8:30 am Post subject: MM 1671 2-5-10 |
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300600001207008400000009006040300070008010600050006000400700000006200304800005000
| Code: |
+-------+-------+-------+
| 3 . . | 6 . . | . . 1 |
| 2 . 7 | . . 8 | 4 . . |
| . . . | . . 9 | . . 6 |
+-------+-------+-------+
| . 4 . | 3 . . | . 7 . |
| . . 8 | . 1 . | 6 . . |
| . 5 . | . . 6 | . . . |
+-------+-------+-------+
| 4 . . | 7 . . | . . . |
| . . 6 | 2 . . | 3 . 4 |
| 8 . . | . . 5 | . . . |
+-------+-------+-------+
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sat Feb 13, 2010 7:54 am Post subject: |
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I haven't looked at the forum in a while, but... what's with these puzzles with no solutions posted? I'll take a crack at this one.
After basics:
| Code: | +---------------+---------------+---------------------+
| 3 9 45 | 6 2457 47 | 2578 258 1 |
| 2 6 7 | 1 35 8 | 4 359 359 |
| 15 8 145 | 45 237 9 | 27 23 6 |
+---------------+---------------+---------------------+
| 6 4 19 | 3 59 2 | 1589 7 589 |
| 79 23 8 | 459 1 47 | 6 23459 2359 |
| 179 5 23 | 8 479 6 | 129 12349 239 |
+---------------+---------------+---------------------+
| 4 12 259 | 7 689 3 | 12589 125689 2589 |
| 59 7 6 | 2 89 1 | 3 589 4 |
| 8 123 239 | 49 469 5 | 129 1269 7 |
+---------------+---------------+---------------------+ |
A little bit of coloring revealed:
[1] (1)r4c3=(1-4)r3c1=(4)r1c3 - (4)r1c56=(4-5)r3c4=(5)r5c4 - (5=9)r4c5 - (9=1)r4c3; r4c3=1
Now:
| Code: | +--------------+---------------+---------------------+
| 3 9 45 | 6 2457 47 | 2578 258 1 |
| 2 6 7 | 1 35 8 | 4 359 359 |
| 1 8 45 | 45 237 9 | 27 23 6 |
+--------------+---------------+---------------------+
| 6 4 1 | 3 59 2 | 589 7 589 |
| 79 23 8 | 459 1 47 | 6 23459 2359 |
| 79 5 23 | 8 479 6 | 129 12349 239 |
+--------------+---------------+---------------------+
| 4 12 29 | 7 689 3 | 12589 125689 2589 |
| 5 7 6 | 2 89 1 | 3 89 4 |
| 8 123 239 | 49 469 5 | 129 1269 7 |
+--------------+---------------+---------------------+ |
[2] Sashimi Jellyfish (yum!), c1347 (Fin r4c7): r56c89<>9
[3] (4=7)r1c6 - (7)r5c6=(7-9)r5c1=(9)r5c4 - (9=4)r9c4; r3c4<>4
Now:
| Code: | +--------------+-------------+--------------+
| 3 9 5 | 6 247 47 | 278 28 1 |
| 2 6 7 | 1 3 8 | 4 59 59 |
| 1 8 4 | 5 27 9 | 27 3 6 |
+--------------+-------------+--------------+
| 6 4 1 | 3 5 2 | 89 7 89 |
| 79 23 8 | 49 1 47 | 6 25 235 |
| 79 5 23 | 8 79 6 | 1 4 23 |
+--------------+-------------+--------------+
| 4 12 29 | 7 689 3 | 5 16 289 |
| 5 7 6 | 2 89 1 | 3 89 4 |
| 8 123 239 | 49 469 5 | 29 16 7 |
+--------------+-------------+--------------+ |
There is an XY-Wing that I'll ignore for a moment. Instead...
[4] 27UR in r13c57: r3c5=2 (due to conjugate pairs and 47 bivalue at r1c6)
Or, you could construct an AIC based on UR[(4)r1c5=(8)r1c7] that does the same thing.
Now...
[5] 289 XY-Wing in b39: r1c6<>2
That solves it. |
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