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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jun 12, 2010 8:47 pm Post subject: Puzzle 10/06/12: (B) Advanced (corrected) |
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| Code: | +-----------------------+
| 7 3 . | . 1 . | . . . |
| 1 . . | 4 8 . | . 3 . |
| . . . | 3 . 7 | . . . |
|-------+-------+-------|
| . 9 6 | . 7 . | 2 . . |
| 8 7 . | 2 . 4 | . . . |
| . . 2 | . 3 9 | . 7 4 |
|-------+-------+-------|
| . . . | 7 . . | 5 . . |
| . 5 . | . . 3 | . 8 . |
| . . . | . . 8 | . . 6 |
+-----------------------+
|
Play this puzzle online at the Daily Sudoku site
| Code: | after basics
+--------------------------------------------------------------+
| 7 3 458 | 9 1 256 | 46 246 258 |
| 1 26 59 | 4 8 256 | 679 3 2579 |
| 29 246 58 | 3 26 7 | 1 2469 58 |
|--------------------+--------------------+--------------------|
| 4 9 6 | 8 7 1 | 2 5 3 |
| 8 7 3 | 2 5 4 | 69 69 1 |
| 5 1 2 | 6 3 9 | 8 7 4 |
|--------------------+--------------------+--------------------|
| 3 8 1 | 7 2469 26 | 5 249 29 |
| 6 5 49 | 1 249 3 | 479 8 279 |
| 29 24 7 | 5 49 8 | 3 1 6 |
+--------------------------------------------------------------+
# 46 eliminations remain
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jun 13, 2010 4:09 am Post subject: |
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I really enjoyed this puzzle....
1. AUR58 r13c39 with x-wing 8 overlay; r1c39<>5
2. x-wing 4 r18c37; r1c8,r8c5<>4
3. At this point I once again have a step of questionable validity: a Almost XY-loop (AXY-loop)
| Code: | *--------------------------------------------------*
| 7 3 d48 | 9 1 5 | 46 26 28 |
| 1 6 b59 | 4 8 2 |a79 3 579 |
| 29 24 c58 | 3 6 7 | 1 49 58 |
|----------------+----------------+----------------|
| 4 9 6 | 8 7 1 | 2 5 3 |
| 8 7 3 | 2 5 4 | 69 69 1 |
| 5 1 2 | 6 3 9 | 8 7 4 |
|----------------+----------------+----------------|
| 3 8 1 | 7 249 6 | 5 249 29 |
| 6 5 e49 | 1 29 3 |f479 8 279 |
| 29 24 7 | 5 49 8 | 3 1 6 |
*--------------------------------------------------* |
The AXY-loop is abcdef plus fin (4) in cell f
If the xy-loop is true then r2c9,r8c59<>9
If the fin is true, (4)r8c7 - (4=9)r8c3; r8c59<>9
4. If the above is valid, I finished the puzzle with a BUG+1 which forces r7c8=9
So, let the fun begin; the shooting gallery is open...........
Ted |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Sun Jun 13, 2010 6:57 am Post subject: |
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From the peanut gallery:
Almost works, but so does short and naked.
(9=4)r3c8-(4=6)r1c7-(6=9)r5c7 =>r5c8<>9, singles.
Update: available after the AUR. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Jun 13, 2010 10:23 am Post subject: |
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I decided to stick to the technique guidance on this - so advanced moves only...
Four steps... [Edit] judging from Lukes post (1) and (3) werent needed!
| Quote: | x-wing(4) r18c37; r8c5<>4, r1c8<>4
type 4 UR(58) r13c39; r1c39<>5
kite(9) in b1 extended (9)r5c8=r5c7; r8c7<>9
xy-wing(469) r1c7; r2c7<>9, r5c8<>9 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Jun 14, 2010 12:55 pm Post subject: |
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I sadly didn't but found a lot of fun with my first "double ALS" takeout. At least I think it is..could be an invalid move....
As usual, a picture is worth a thousand words:
ALS XZ with double elimination
X={2,4,5,8,9} Orange
Z={2,6} Green
Restricted common can be 2 or 6
Common candidate eliminateds are 2 and 6 from r3c8
Then it is the <469> XY wing as already shown.
[Edit to correct typo]
Last edited by Mogulmeister on Mon Jun 14, 2010 3:41 pm; edited 3 times in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Jun 14, 2010 1:40 pm Post subject: |
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Very nice MM..........
Ted |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Jun 14, 2010 3:26 pm Post subject: |
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| tlanglet wrote: | I really enjoyed this puzzle....
1. AUR58 r13c39 with x-wing 8 overlay; r1c39<>5
2. x-wing 4 r18c37; r1c8,r8c5<>4
3. At this point I once again have a step of questionable validity: a Almost XY-loop (AXY-loop)
| Code: | *--------------------------------------------------*
| 7 3 d48 | 9 1 5 | 46 26 28 |
| 1 6 b59 | 4 8 2 |a79 3 579 |
| 29 24 c58 | 3 6 7 | 1 49 58 |
|----------------+----------------+----------------|
| 4 9 6 | 8 7 1 | 2 5 3 |
| 8 7 3 | 2 5 4 | 69 69 1 |
| 5 1 2 | 6 3 9 | 8 7 4 |
|----------------+----------------+----------------|
| 3 8 1 | 7 249 6 | 5 249 29 |
| 6 5 e49 | 1 29 3 |f479 8 279 |
| 29 24 7 | 5 49 8 | 3 1 6 |
*--------------------------------------------------* |
The AXY-loop is abcdef plus fin (4) in cell f
If the xy-loop is true then r2c9,r8c59<>9
If the fin is true, (4)r8c7 - (4=9)r8c3; r8c59<>9
4. If the above is valid, I finished the puzzle with a BUG+1 which forces r7c8=9
So, let the fun begin; the shooting gallery is open...........
Ted |
Looks fine to me. I like it. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Jun 14, 2010 3:35 pm Post subject: |
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| Quote: | X={2,4,5,8,9} Orange
Z={2,9} Green
Restricted common can be 2 or 6
Common candiadate eliminateds are 2 and 6 from r3c8 |
I don't follow this. should it be:
In any event, R2C2 = <26>. In B1, the other <26> can only be in R3C12, making a pseudocell that forms a pair with R3C5. Thus, R3C8 is not 26.
Does this have a name? It seems fairly simple.
Keith |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Jun 14, 2010 3:40 pm Post subject: |
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Thanks for picking up the typo Keith. I will amend. As far as I know it is an ALS XZ elimination as set out if memory serves by Myth Jellies.
[Most of the ones I've used/seen hitherto have been single digit eliminations or multiple eliminations of a single digit - this one has two different digits.
Last edited by Mogulmeister on Mon Jun 14, 2010 5:50 pm; edited 2 times in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jun 14, 2010 5:01 pm Post subject: |
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| I used the implications of the 58 AUR to solve a few cells. After that it became a Type 4 UR on 58 and an XY-Wing (469) finished it off. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Jun 14, 2010 5:47 pm Post subject: |
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| Mogulmeister wrote: | | Thanks for picking up the typo Keith. I will amend. As far as I know it is an ALS XZ elimination as set out if memory serves by Myth Jellies. |
Sadly the original post for this technique at http://www.sudoku.com/forums/viewtopic.php?p=16334 (put there I think in 2006) has been lost due to the well documented problems with that forum. |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Mon Jun 14, 2010 6:13 pm Post subject: |
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| Mogulmeister wrote: | | Mogulmeister wrote: | | Thanks for picking up the typo Keith. I will amend. As far as I know it is an ALS XZ elimination as set out if memory serves by Myth Jellies. |
Sadly the original post for this technique at http://www.sudoku.com/forums/viewtopic.php?p=16334 (put there I think in 2006) has been lost due to the well documented problems with that forum. |
After restoration, the link is ... http://forum.enjoysudoku.com/viewtopic.php?p=16334#p16334
BTW it was Bob Hanson, not Myth Jellies, that posted the doubly-linked ALS-xz. bennys introduced us to the original singly-linked ALS-xz. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Jun 14, 2010 6:41 pm Post subject: |
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Excellent and thanks Ronk, I remember reading some time ago but couldn't locate it again. I do remember that Myth was also centrally involved in some way but.........
Last edited by Mogulmeister on Mon Jun 14, 2010 7:10 pm; edited 1 time in total |
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