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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Nov 28, 2009 5:53 am Post subject: Puzzle XY 09/11/27 |
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Return of the XY series of puzzles.
| Code: | +-----------------------+
| 4 . 2 | . . 9 | 1 . 6 |
| . . . | 3 1 . | . . . |
| 7 . 3 | . . 2 | . . . |
|-------+-------+-------|
| . 2 . | . 9 . | . 5 . |
| . 7 . | 8 . . | . . 3 |
| 6 . 1 | . . 5 | 2 . . |
|-------+-------+-------|
| 2 . . | . . 1 | 3 . . |
| . . . | 2 . . | . 6 . |
| 1 . . | . 7 . | . . 9 |
+-----------------------+
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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: Sun Nov 29, 2009 12:04 am Post subject: |
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| I had a tough time with this one. Two XY-Wings, four ERs and a UR and I hit the wall. A Medusa wrap opened up a couple of W-Wings and a Kite, but I needed another Medusa wrap to finish up. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Nov 29, 2009 5:52 am Post subject: |
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| Marty R. wrote: | | I had a tough time with this one. Two XY-Wings, four ERs and a UR and I hit the wall. A Medusa wrap opened up a couple of W-Wings and a Kite, but I needed another Medusa wrap to finish up. |
Congratulations Marty on finding a workaround to the M-Wing at the end (where you hit the wall). The rest of your solution matches my solver for the most part -- assuming your UR was a Type 4. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Nov 29, 2009 6:16 am Post subject: |
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| Yes, it was a Type 4 on 38. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Dec 04, 2009 3:34 am Post subject: |
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I spent more time and energy on this puzzle and any other in the recent past.
I started with a xy-wing -589,
then three consecutive ERs on 5,
a w-wing 48,
kite on 8,
xy-wing -459 and then I hit the wall.
I finally found a conflicting chain that eliminated 8 form r7c8 which set up a xy-wing 47-8 to complete the puzzle.
Would you please pass the Scotch bottle!!!
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 04, 2009 6:36 pm Post subject: |
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Yes, I suspected this puzzle would cause problems. Too many eliminations that don't contribute to a solution ... and a rough final step.
| Code: | c3b4 Locked Candidate 1 <> 4 r789c3
r2 b1 Locked Candidate 1 <> 9 r2c78
XY-Wing r6c2/r1c2+r5c1 <> 5 r2c1 extraneous
c49r3 Skyscraper <> 5 r7c5,r9c7 extraneous
r1c4 2-String Kite <> 5 r9c2 extraneous
r1c1 2-String Kite <> 8 r8c5
XY-Wing r1c5/r2c6+r8c5 <> 4 r3c5,r89c6
c6b8 Locked Pair <> 38 r7c5 extraneous
r89c26 <38> UR Type 4 <> 8 r89c2 extraneous
gM-Wing: (4=9)r5c7 - r3c7 = (9-4)r3c8 = (4)r7c8 => r89c7<>4
+-----------------------------------------------------------------------+
| 4 58 2 | 7 58 9 | 1 3 6 |
| 589 5689 5689 | 3 1 4 | 578 78 2 |
| 7 1 3 | 56 568 2 | b4589 c489 458 |
|-----------------------+-----------------------+-----------------------|
| 3 2 48 | 1 9 7 | 6 5 48 |
| 59 7 459 | 8 2 6 | a49 1 3 |
| 6 89 1 | 4 3 5 | 2 789 78 |
|-----------------------+-----------------------+-----------------------|
| 2 4568 5678 | 9 4568 1 | 3 d478 4578 |
| 589 34589 5789 | 2 45 38 | 578-4 6 1 |
| 1 34568 568 | 56 7 38 | 58-4 2 9 |
+-----------------------------------------------------------------------+
# 71 eliminations remain
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