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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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 Posted: Sat Nov 26, 2011 5:45 pm Post subject: Vanhegan Extreme November 26, 2011 |
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| Code: |
+-------+-------+-------+
| . . . | 4 5 . | . 2 . |
| 3 9 . | . 7 . | . 4 . |
| . . 5 | . . 2 | 1 . . |
+-------+-------+-------+
| . . 6 | . . . | . . 2 |
| 5 1 . | . . . | . 7 9 |
| 9 . . | . . . | 5 . . |
+-------+-------+-------+
| . . 7 | 6 . . | 8 . . |
| . 5 . | . 2 . | . 3 6 |
| . 6 . | . 3 8 | . . . |
+-------+-------+-------+
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Play online
After basics:
| Code: | *-----------------------------------------------------------*
| 1678 78 18 | 4 5 369 | 79 2 378 |
| 3 9 2 | 8 7 1 | 6 4 5 |
| 4678 478 5 | 39 69 2 | 1 89 378 |
|-------------------+-------------------+-------------------|
| 478 478 6 | 1359 1489 3459 | 34 18 2 |
| 5 1 348 | 2 468 346 | 34 7 9 |
| 9 2 348 | 137 148 347 | 5 6 18 |
|-------------------+-------------------+-------------------|
| 2 3 7 | 6 149 459 | 8 159 14 |
| 148 5 1489 | 179 2 479 | 79 3 6 |
| 14 6 149 | 1579 3 8 | 2 159 147 |
*-----------------------------------------------------------*
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I had another three step solution then reduced it to two steps
xy-wing (79-8)r1c72+r3c8; r1c9,r3c12<>8
AUR(47)r34c12 SIS r3c1=6, r4c12=8
(9=6)r3c5-AUR (47)r34c12[(6)r3c1=(8)r4c12]-r4c8=(8-9)r3c8=r1c7; r1c6,r3c8<>9
(4)r9c1=(4)r9c9-r7c9=r7c5-r6c5=r6c3; r8c3<>4
Note that xy-wing is not necessary:
AUR(47)r34c12 SIS r3c1=6, r34c12=8; r1c6,r3c8<>9
(6)r3c1-(6=9)r3c5
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(8)r3c12-(8=7=9)r1c27
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(8)r4c12-r4c8=(8-9)r3c8=r1c7
Ted |
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