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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Nov 07, 2009 8:13 pm Post subject: Set XY 09/11/07 |
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Next to last puzzle in datafile for this set. I needed an XY-Chain.
| 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: | +-----------------------+
| 1 6 . | . 3 . | . . . |
| 5 9 . | 8 1 . | 3 . . |
| . . 3 | . . . | . . 5 |
|-------+-------+-------|
| . 7 . | 1 . . | 9 . . |
| 9 1 . | . 6 . | 8 3 . |
| . . . | . . . | . 2 . |
|-------+-------+-------|
| . 3 . | 6 4 . | 2 5 9 |
| . . . | . 9 8 | 6 1 . |
| . . 9 | . . . | 4 . . |
+-----------------------+
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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 Nov 08, 2009 12:04 am Post subject: |
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Another fun puzzle 
By just taking what appeared, I used five steps to complete the puzzle. | Quote: | type 1 UR46 sets r2c9=2,
looking for a xy-wing I found an AIC: (4=2)r8c3 - (2=8)r1c3 - (8)r1c8 = (8)r3c8 - (8=24)r3c12 - (2=7)r3c5 - (7=8)r6c5 - (8=4)r6c2; r5c3, r8c2<>4
xyz-wing 235 in r4c6
useless w-wing 25 in r5c3 & r8c4 with strong link 2 in r1c34 plus pincer transport,
BUG+2 requires r1c4=9 or r3c4=2, thus (8=9)r1c8 - BUG[(9)r1c4 = (2)r3c4] - (2=4)r3c1 - (4=8)r3c2; r1c3, r3c8<>8.
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Ted |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sun Nov 08, 2009 8:38 am Post subject: |
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For fun a one step  | Code: | *-----------------------------------------------------------*
| 1 6 a248 | 2459 3 2459 | 7 *8-9 24 |
| 5 9 7 | 8 1 24 | 3 46 246 |
| 24 248 3 |f2479 27 6 | 1 *9-8 5 |
|-------------------+-------------------+-------------------|
| 23 7 b258 | 1 c258 235 | 9 46 46 |
| 9 1 245 | 245 6 245 | 8 3 7 |
| 34 48 6 |e479 d78 349 | 5 2 1 |
|-------------------+-------------------+-------------------|
| 8 3 1 | 6 4 7 | 2 5 9 |
| 7 245 24 | 25 9 8 | 6 1 3 |
| 6 25 9 | 3 25 1 | 4 7 8 |
*-----------------------------------------------------------*
(8)r1c8=(8)r1c3-(8)r4c3=(8)r4c5-(8=7)r6c5-(7)r6c4=(7-9)r3c4=(9)r3c8
=> r3c8<>8, r1c8<>9;
singles
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Nov 09, 2009 5:41 am Post subject: |
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I used a W-Wing on 24 and two different 25 URs.
Note to Ted: regarding the comment you made on the other puzzle about using a UR to establish pincers, that was done with both of the aforementioned URs. |
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