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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Sun Dec 07, 2008 8:38 pm Post subject: 12/7 competition |
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| Code: |
+-------+-------+-------+
| 3 . . | . . . | . . 1 |
| 2 6 . | . . 5 | . 8 . |
| . 5 . | 6 8 . | 7 . . |
+-------+-------+-------+
| . . . | . 3 . | . . . |
| . 8 . | . . . | . 2 . |
| 1 . . | . 9 . | . . . |
+-------+-------+-------+
| . . 7 | . 2 8 | 6 3 . |
| . 3 . | 1 . . | . 5 4 |
| 8 . . | . . . | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
friday's puzzle was a VH. this sunday diabolical is a little more. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Dec 07, 2008 10:08 pm Post subject: |
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| One-Stepper wrote: | gM-Wing: (7=6)r8c5 - (6)r8c1 = (6-7)r4c1 = (7)r5c1 => [r5c5]<>7
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| Code: | UR (34) [r56c37] => [r5c3]<>4 not needed
UR (46) [r46c36] => [r6c6]<>4 not needed
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Any other URs?
Last edited by daj95376 on Mon Dec 08, 2008 12:19 am; edited 1 time in total |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Dec 07, 2008 10:30 pm Post subject: |
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| very nice |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sun Dec 07, 2008 11:59 pm Post subject: |
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I also had a one-stepper, a very simple AIC loop that exploited a couple of those 49 bivalues:
(4=9)r3c1 - (9)r8c1=(9-4)r9c2=(4)r7c1 - (4=9)r3c1:Loop; r45c1<>49
Actually, it was very easy to see. Each digit of the r9c2 49 has a conjugate link in b7 to the c1 segment of b7. This creates a 49 pseudocell in r78c1 and, in effect, a hidden 49 pair in c1. It is akin to a Sue de Coq, or perhaps a sort of gM-Wing folded back on itself. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Dec 08, 2008 1:03 am Post subject: |
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Oh good, Asellus introduced loops.
| Code: | (*) strong links on (5): [c1] & [b7]
(@) strong links on (6): [c1] & [b7]
(5)r4c1 = (5)r7c1 - (5=6)r9c3 - (6)r8c2 = (6)r4c1 => [r4c1]<>479
+------------------------------------------------------------------------+
| 3 7 8 | 9 4 2 | 5 6 1 |
| 2 6 49 | 7 1 5 | 49 8 3 |
| 49 5 1 | 6 8 3 | 7 49 2 |
|------------------------+-----------------------+-----------------------|
| *56-479@ 249 456 | 28 3 1467 | 149 479 58 |
| 479 8 349 | 45 57 147 | 1349 2 6 |
| 1 24 3456 | 28 9 467 | 34 47 58 |
|------------------------+-----------------------+-----------------------|
| *45 1 7 | 45 2 8 | 6 3 9 |
| 69@ 3 2 | 1 67 79 | 8 5 4 |
| 8 49 *56@ | 3 56 49 | 2 1 7 |
+------------------------------------------------------------------------+
# 51 eliminations remain
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As a friendly forcing net:
| Code: | [r9c3]=5 [r7c1]<>5 [r4c1]=5
=> [r4c1]<>479
[r9c3]=6 [r8c1]<>6 [r4c1]=6
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Dec 08, 2008 8:05 am Post subject: |
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| Code: |
+-------+-------+-------+
| . . 7 | 4 1 . | 6 . . |
| . 3 . | 6 . . | . . . |
| 4 . 6 | . . 9 | 5 . . |
+-------+-------+-------+
| . 8 . | . . . | . 5 . |
| 6 . . | . 3 . | . . 4 |
| . 1 . | . . . | . 8 . |
+-------+-------+-------+
| . . 8 | 5 . . | 1 . 7 |
| . . . | . . 2 | . . . |
| . . 3 | . 6 8 | 9 . . |
+-------+-------+-------+ |
Play this puzzle online at the Daily Sudoku site
throw this in there for kicks. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Dec 08, 2008 4:01 pm Post subject: |
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| Quote: | 2-String Kite, or ER, or finned X-Wing ... same elimination
XY-Wing w/pincers
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