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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Aug 15, 2010 5:37 pm Post subject: Puzzle 10/08/15: C |
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I'm in the process of reviewing a new batch of potential XY rated puzzles.
| Code: | +-----------------------+
| 7 9 . | . . . | . 5 8 |
| 5 . . | 9 . . | 3 7 . |
| . . 6 | . . . | . . 9 |
|-------+-------+-------|
| . 4 . | 7 . 9 | . . 3 |
| . . . | . 5 8 | . . . |
| . . . | 6 4 . | 7 . . |
|-------+-------+-------|
| . 1 . | . . 6 | 8 . . |
| 4 6 . | . . . | . . 7 |
| 3 . 2 | 5 . . | . 4 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Rating wrote: | BBDB XY+ --> unlikely a single-stepper
Bonus Credit for the solution with the fewest candidates at XY step
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Aug 15, 2010 6:53 pm Post subject: Re: Puzzle 10/08/15: C |
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| Rating wrote: | ...fewest candidates at XY step...
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Danny, could you clarify what you mean by "candidates" - unsolved cells? |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 15, 2010 8:29 pm Post subject: |
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I plan to go back and do basics again since I completed the puzzle using one or two conventional steps, depending on how you count.
| Quote: | Type 6 UR (14)r12c36; to prevent DP, r2c3=8 or r1c6=23
(8)r2c3-(8=1)r3c1-(1=2)r3c8-r7c8=r7c5-(2=1)r4c5-(1=8)r4c3; r2c3<>8,
which then creates a Type 1 UR (14)r12c36; r1c6<>14 |
[Edited to correct location of initial deletion.]
Ted
Last edited by tlanglet on Sun Aug 15, 2010 9:00 pm; edited 1 time in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 15, 2010 8:36 pm Post subject: |
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I repeated basics and my solution with the same result.
Ted
Last edited by tlanglet on Sun Aug 15, 2010 8:58 pm; edited 1 time in total |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Aug 15, 2010 8:40 pm Post subject: |
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Ted, that's really neat!
I think you mean r2c3<>8 in the elimination to make the Type 1 UR |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sun Aug 15, 2010 9:29 pm Post subject: |
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| Quote: | Kraken XWing on 1 : (1)R35/C48 + fins (1)r3c1, (1)r5c7 : => r4c8<>1
6-SIS AIC : (26)R4C1 (68)R4C8 (81)R4C3 1B1 (12)R3C8 2R7 : (2)r4c1=(2)r7c5 : => r4c5<>2 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 15, 2010 10:16 pm Post subject: |
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| JC Van Hay wrote: | | Quote: | | Kraken XWing on 1 : (1)R35/C48 + fins (1)r3c1, (1)r5c7 : => r4c8<1> r4c5<>2 |
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JC, Nifty x-wing with two fins. I have tried this a couple of times but never found one that was fruitful.
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Aug 15, 2010 10:43 pm Post subject: Re: Puzzle 10/08/15: C |
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Ignore the "Bonus Credit". It was a bad idea!!!
Last edited by daj95376 on Mon Aug 16, 2010 5:38 am; edited 4 times in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Aug 15, 2010 11:28 pm Post subject: |
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Danny,
I don't know how you will count my solution, one step or two, but neither were of the XY variety. So how do I place in the "Bonus Credit" contest?
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon Aug 16, 2010 7:56 am Post subject: |
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| tlanglet wrote: | | but neither were of the XY variety. |
Ted, not for me to say, but your solution surely is an XY in the sense that it depends on a forcing contradiction chain on the 8 which uses 5 strong links (4 bivalue in-cell and 1 conjugate)? I think of anything involving a chain which is not a recognisable named pattern falls in the XY category. fwiw |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Mon Aug 16, 2010 10:38 am Post subject: |
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Another proof using only 5-SIS : (12)R3C7 2R7 (21)R4C5 1R4 1C1
3-SIS AIC : (12)R3C7 2R7 (21)R4C5 : (1)r3c7=(1)r4c5 : => r4c7<>1
4-SIS AIC : 1R4 1C1 (12)R3C7 2R7 : (1)r4c5=(2)r7c5 : => r4c5<>2 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Aug 16, 2010 3:25 pm Post subject: |
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| tlanglet wrote: | I don't know how you will count my solution, one step or two, but neither were of the XY variety. So how do I place in the "Bonus Credit" contest?
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Since your chain is based on a UR pattern, I'd place your solution under "other URs", which is in the XY (or over) rating.
| Code: | ===== ===== ===== ===== Ratings are Accumulative in 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
turbot: 2-String Kite, Skyscraper, Empty Rectangle, finned/Sashimi X-Wing
VH+: Remote Pair, XYZ-Wing, UR Type 2/4
Advanced: turbot and VH+
XY: gM-Wing, W-Wing, XY-Chain, BUG+2, BUG+3, other URs
Extreme: Chain, Loop, SIN (Single Inference Network)
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 16, 2010 10:00 pm Post subject: |
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| I used a W-Wing on 12 plus a pincer transport. |
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