Search found 42 matches
- Fri Jul 13, 2007 6:35 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 10 July 2007: Mutant Fish Eliminations
- Replies: 5
- Views: 9742
I believe the answer is yes for closed loop single-digit AICs. I don't know if that has actually been proven yet. I did cover that intersection concept in the constraint set section of that fish groups in AICs post. It hasn't been noticed by very many others working on fishy stuff though. Check out ...
- Thu Jul 05, 2007 5:29 am
- Forum: Daily Jigsaw Sudoku
- Topic: Advanced jigsaw techniques and examples
- Replies: 0
- Views: 5896
Advanced jigsaw techniques and examples
I have some advanced jigsaw techniques described in this post.
- Wed Jul 04, 2007 7:19 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 5/13/07 Nightmare
- Replies: 12
- Views: 15283
Yes, Arcilla's trick converts fish into either hidden or naked sets. In Arcilla's representation, Almost Locked Sets and Almost Hidden Sets will correspond to finned fish, although the fin may not occupy the same box as any of the fish vertices (which is hard to see in Arcilla's representation) and ...
- Wed Jul 04, 2007 7:02 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 5/20/07 Nightmare...7's grid
- Replies: 6
- Views: 10434
I am not sure what a hidden fish is. Unlike locked sets where a naked set is coupled with a hidden set, a fish group is always coupled with just another fish group. By stand-alone, I meant a fish deduction that could not be represented more simply, like with a hidden single or locked candidates dedu...
- Fri Jun 22, 2007 6:46 am
- Forum: Solving Techniques & Tips
- Topic: AIC's for uniqueness arguments
- Replies: 1
- Views: 4576
I think any notation which shows the four corners somehow weakly inhibiting the completion of the deadly pattern best depicts what is going on. I like what you have written. There really is no standard though, and many people willl just use strong links between the extra candidates because that is t...
- Thu Jun 21, 2007 7:30 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 5/20/07 Nightmare...7's grid
- Replies: 6
- Views: 10434
There is a trick. For there to be a stand-alone fish, you have to be able to have candidates seeing each other in a loop through the unsolved boxes. With this setup, the only cyclic path through any of the unsolved boxes would be b1-b2-b5-b6-b9-b7-b1.... Since the candidates in b1 and b7 cannot dire...
- Thu Jun 14, 2007 2:20 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 5/13/07 Nightmare
- Replies: 12
- Views: 15283
- Sat Jun 02, 2007 5:13 pm
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 1 June 2007 - "Almost" Swordfish
- Replies: 7
- Views: 11317
There is also a tutorial on Using Fish Groups and Constraint Groups in AICs
(note that box-line or box-box reductions are examples of simple constraint groups)
(note that box-line or box-box reductions are examples of simple constraint groups)
- Sat Jun 02, 2007 4:53 pm
- Forum: Daily Sudoku Nightmare & Archive
- Topic: June 2, 2007 Nightmare - A BUG-Lite AIC
- Replies: 0
- Views: 5804
June 2, 2007 Nightmare - A BUG-Lite AIC
*-----------* |4..|.3.|..1| |..5|...|7..| |71.|.9.|.85| |---+---+---| |...|...|...| |5..|8.6|..7| |19.|...|.52| |---+---+---| |...|.8.|...| |82.|3.1|.74| |.7.|...|.3.| *-----------* *--------------------------------------------------------------------* | 4 68 2689 |*57 3 *57 | 269 26 1 | | 269 36 5...
- Fri Apr 27, 2007 8:34 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 22 April 2007, Grouped AIC's and Rings
- Replies: 6
- Views: 11181
AICs and Nice Loops are two different ways of envisioning the same reduction. Ultimately, one really cannot do any more than the other. Originally I tried to incorporate the AIC observations as a part of Nice Loops, but they were not accepted and so I presented AICs as an alternate and simplified wa...
- Sun Apr 01, 2007 6:06 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 18 March 2007
- Replies: 4
- Views: 8375
Re: 18 March 2007
An AIC which is (in effect) found by the Sudocue solver in a "Medusa Bridge" step is (4)r1c8 = (4-9)r4c8 = (9)r4c4 - (9)r1c4 = (9)r1c6 => r1c6 <> 4 Is there an equivalent ALS rule and/or Wing structure that reproduces this elimination? If it helps, this is basically a multi-digit version ...
- Fri Mar 23, 2007 4:21 am
- Forum: Solving Techniques & Tips
- Topic: Almost Locked Candidates
- Replies: 13
- Views: 15316
- Thu Mar 22, 2007 8:03 am
- Forum: Solving Techniques & Tips
- Topic: Almost Locked Candidates
- Replies: 13
- Views: 15316
Re: Further Thoughts on ALC
/ does not contain X, Y,or Z .---------------------.-----------------.----------. | . . . | XYZ-+ XYZ-+ / | / / / | | XYZ XYZ *-XYZ | . . . | . . . | | *-XYZ *-XYZ *-XYZ | . . . | . . . | .---------------------.-----------------.----------. I couldn't really come up with anything using AIC's to gen...
- Tue Mar 20, 2007 4:02 pm
- Forum: Solving Techniques & Tips
- Topic: Almost Locked Candidates
- Replies: 13
- Views: 15316
- Sat Mar 17, 2007 7:25 am
- Forum: Daily Sudoku Nightmare & Archive
- Topic: 12/16/06 Nightmare - Revisited
- Replies: 2
- Views: 6946
Re: 12/16/06 Nightmare - Revisited
1 2 567 | 49 3 49 | 56 67 8 8 C69 356 | 2 1 7 | 45 D36 469 C379 C79 4 | 6 5 8 | 1 237 A29 --------------+---------------+-------------- 5 14 9 | 3 7 26 | 8 246 A126 26 3 68 | 5 48 1 | 9 246 7 267 14 678 | 48 9 26 | 3 5 A126 --------------+---------------+-------------- B69 5 1 | 7 2 49 | B46 8 3 36...