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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jun 04, 2011 4:30 pm Post subject: Puzzle 11/06/04: ~ XY |
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| Code: | +-----------------------+
| 2 8 . | 5 . . | . 4 9 |
| 4 7 . | . . . | . 8 5 |
| . . . | . . 4 | . 2 . |
|-------+-------+-------|
| 3 . . | . . . | . . . |
| . . . | . 6 . | . 5 8 |
| . . 8 | . . 2 | . . . |
|-------+-------+-------|
| . . . | . . . | 2 . 1 |
| 1 2 3 | . 8 . | . 6 . |
| 5 6 . | . 1 . | 8 . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jun 05, 2011 12:59 am Post subject: |
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My first two moves combined to do the trick............
| Quote: | (3=7)r9c6-r8c46=r8c9-(7=6)r3c9-aur(16)r12c36[(6)r3c1=(1-3)r5c6]; r5c6<>3
aur(36)r12c67[(3)r59c6=(6-7)r3c9]=r1c7-(7=3)r1c5; r12c6<>3
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Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Jun 05, 2011 5:19 pm Post subject: |
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An xy-chain with an anp ...
| Quote: | | anp(4=37)r71c5 - (7=9)r3c5 - (9=6)r3c1 - (6=7)r3c9 - (7=4)r8c9 ; r8c4<>4 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jun 05, 2011 8:56 pm Post subject: |
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| Ted wrote: | (3=7)r9c6-r8c46=r8c9-(7=6)r3c9-aur(16)r12c36[(6)r3c1=(1-3)r5c6]; r5c6<>3
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While reviewing Ted's first step, I noticed a close alternative:
| Code: | +-----------------------------------------------------------------------+
| 2 8 *16 | 5 37 *16+37% | 367 4 9 |
| 4 7 *16+9 | 139 2 *16+39% | 36 8 5 |
| 69 3 5 | 8 79 4 | 1 2 67 |
|-----------------------+-----------------------+-----------------------|
| 3 1459 469 | 1479 4579 8 | 4679 17 2 |
| 79 149 2 | 13479 6 1379 | 479 5 8 |
| 679 1459 8 | 1479 4579 2 | 4679 137 367 |
|-----------------------+-----------------------+-----------------------|
| 8 49 479 | 6 347 5 | 2 379 1 |
| 1 2 3 | 479 8 79% | 5 6 47 |
| 5 6 479 | 2 1 37% | 8 379 347 |
+-----------------------------------------------------------------------+
# 81 eliminations remain
(3=7)r9c6-r8c46=r8c9-(7=6)r3c9-(6=9)r3c1-(9)r2c3=<16>UR_Type_3 => r5c6<>3
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Jun 06, 2011 2:25 am Post subject: |
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| peterj wrote: | An xy-chain with an anp ...
| Quote: | | anp(4=37)r71c5 - (7=9)r3c5 - (9=6)r3c1 - (6=7)r3c9 - (7=4)r8c9 ; r8c4<>4 |
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Peter, Those anp()s can be clean and deadly.
Ted |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Jun 06, 2011 2:31 am Post subject: |
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Danny,
Great spot! I would never have noticed the locked set in box2 that forces r5c6<>3. Very unusual I think.
I might have noticed that the ls (379)b2q368-(39=1)r2c4-r456c4=(1-3)r5c6
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jun 06, 2011 4:50 am Post subject: |
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Potential DP (79), b79; common outcome; r9c8=9
M-Wing (47); r7c8<>7
M-Wing (47), flightless; r7c2<>4
(Last move may have been unnecessary because I may have overlooked a naked pair after move #2)
Edited. I did it again and the 3rd move was indeed unnecessary. |
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