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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Oct 20, 2009 9:17 pm Post subject: Set XY_03 Puzzle 044 |
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My solver used a 6-cell gM=Wing. Perfect for those who like chains.
| Code: | XY puzzles can be solved using these techniques:
Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidates 1/2
Basics+: Naked Quad, Hidden Pair/Triple/Quad
VH: BUG+1, UR Type 1, X-Wing, XY-Wing
VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper,
XYZ-Wing, finned X-Wing, UR Type 2/4
XY: gM-Wing, W-Wing, XY-Chain, BUG+2, BUG+3, other URs
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| Code: | +-----------------------+
| 5 . . | . . 2 | 9 1 . |
| . 8 2 | . . 9 | . . . |
| . 9 4 | . 1 8 | 3 . . |
|-------+-------+-------|
| . . . | . . . | . . . |
| . . 6 | . 4 . | . . 9 |
| 8 1 9 | . . 5 | . 3 4 |
|-------+-------+-------|
| 9 . 1 | . . . | 7 . . |
| 7 . . | . . 4 | . 9 . |
| . . . | . 8 7 | . . 2 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Oct 21, 2009 2:58 pm Post subject: |
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Fun!  | Code: | *-----------------------------------------------------------*
| 5 37 37 | 4 6 2 | 9 1 8 |
| 1 8 2 | 357 357 9 | 4 56 567 |
| 6 9 4 | 57 1 8 | 3 2 57 |
|-------------------+-------------------+-------------------|
| 4 357 37 |*28 9 d36 | 8-2 567 1 |
| 2 357 6 |e38 4 1 | 58 57 9 |
| 8 1 9 | 67-2 7-2 5 |*26 3 4 |
|-------------------+-------------------+-------------------|
| 9 4 1 | 2356 235 c36 | 7 8 35 |
| 7 2 8 | 1 b35 4 |a56 9 356 |
| 3 6 5 | 9 8 7 | 1 4 2 |
*-----------------------------------------------------------*
XY-Chain:
(2=6)r6c7-(6=5)r8c7-(5=3)r8c5-(3=6)r7c6-(6=3)r4c6-(3=8)r5c4-(8=2)r4c4
=> r4c7,r6c45<>2;
singles remain
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Oct 21, 2009 9:38 pm Post subject: |
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| XY-Wing on 356, pivoted in r8c5. It's flightless, but transporting the 6 from r8c7 to r4c8 knocks out the 6 from r4c6 and that does it. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Oct 22, 2009 11:57 pm Post subject: |
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Once again I used a UR implication to form a chain.
UR 57 in r23c49: either r2c4=3 or r2c9=6 to prevent the deadly pattern.
UR57[(3)r2c4 = (6)r2c9] - (6)r8c9 = (6)r8c7 - (6=2)r6c7 - (2=8)r4c7 - (8)r4c4 = (8)r5c4; r5c4=8 to complete the puzzle.
Ted |
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