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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Apr 06, 2011 5:19 pm Post subject: Puzzle 11/04/06: B Moderate (BBDB?) |
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| Code: | +-----------------------+
| . 8 . | . . . | 1 . . |
| 4 2 . | . 5 1 | . 3 8 |
| . . 5 | 3 8 . | 4 2 . |
|-------+-------+-------|
| . . 9 | . 2 . | . . . |
| . 7 4 | 1 3 5 | . . . |
| . 1 . | . 9 . | . . . |
|-------+-------+-------|
| 5 . 1 | . . . | . 4 . |
| . 4 6 | . . . | 9 1 . |
| . 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: Thu Apr 07, 2011 4:57 am Post subject: |
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Not the most satisfying solution, but...
Doing an external analysis on the potential 23 DP in boxes 89, one of r1c6, r5c9 or r7c9 had to be=2. R5c9, r7c9<>2 due to invalidity. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Apr 07, 2011 9:39 am Post subject: |
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I squeezed in under 5 moves just - but only by using an als...
| Quote: | kite(8) r5, c3 ; r9c7<>8
w-wing(28) ; (2=8)r5c7 - r7c7=r9c8 - (8=2)r9c3 ; r9c7<>2
kite(8) r8, c3 ; r6c6<>8
w-wing/als(48) (4=28)r9c43 - r9c8=r4c8 - (8=4)r4c6 ; r4c4<>4 |
There were a lot of turbot moves on 8! Someone more versed in the dark fish arts will probably find some monster franken thing...? |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Thu Apr 07, 2011 12:27 pm Post subject: |
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Peter, no monster franken thing ..., but a Remotely Finned Swordfish on 8s ... 
| Code: | | X-Loop on 8s : {r5c1=r5c7-r7c7=r7c4-r8c46=r8c1} => -8r469c7, -8r9c46, -8r46c1 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Apr 07, 2011 2:47 pm Post subject: |
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JC, thanks! I am really rubbish at all those higher fish.
I did go back and find this one-stepper which might (?) be a kraken franken swordfish?!  .. if not just an almost-x-chain! (Edit. As it's not a loop I guess it can't be a fish)
| Code: | almost-fishy(8) ; r9c8<>8
x-chain(8) (8)r7c7=r7c4 - r89c6=r6c6 - r6c3=r9c3
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(8)r4c6 - (4)r4c6=r9c6 - (4=258)r9c437 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Apr 07, 2011 4:45 pm Post subject: |
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| JC Van Hay wrote: | Peter, no monster franken thing ..., but a Remotely Finned Swordfish on 8s ...
| Code: | | X-Loop on 8s : {r5c1=r5c7-r7c7=r7c4-r8c46=r8c1} => -8r469c7, -8r9c46, -8r46c1 |
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Your pattern can be viewed as a:
| Code: | Franken Swordfish r578\c17b8 <> 8 r46c17,r9c467
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No fin. However, an excellent example of the strong links in an X-Loop overlaying the base sectors of a fish.
Peter: I believe that the majority of "fish" patterns can't be expressed as loops. If r7c1 and r8c7 had contained an <8> as a candidate in this grid, then I'm fairly sure that an X-Loop isn't possible, but the Franken Swordfish would have still been viable:
| Code: | Franken Swordfish r578\c17b8 <> 8 r46c17,r9c467
+-----------------------------------+
| * . . | . . . | * . . |
| * . . | . . . | * . . |
| * . . | . . . | * . . |
|-----------+-----------+-----------|
| ** . . | . . . | ** . . |
| X / / | / / / | X / / |
| ** . . | . . . | ** . . |
|-----------+-----------+-----------|
| X / / | X X X | X / / |
| X / / | X X X | X / / |
| * . . | ** * ** | ** . . |
+-----------------------------------+
(**) represent real eliminations in this grid, and
(* ) represent additional eliminations possible from fish pattern
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