champagne wrote:Congratulations, as a first post, you entered what was considered one year ago as an extremely difficult field.
To be honest, I'm not that new to this forum. I posted as Obi-Wahn back in 2008 but since the forum was moved I can't seem to log into my old account. I even posted three of my own puzzles OW081006, OW081007 and OW081008 with SE 11.4 - 11.7 in the old "The hardest sudokus" thread, which unfortunately never made it to your database and are now attributed to someone else.
Regarding the multifish pattern, it also appears in the other three SE 11.8 puzzles next to the one I discussed above:
- Code: Select all
68.7.....3..89......1..4...7...3.9....6...7....2....51.6..8.3.......5.4.........2;11.80;1.50;1.50;225578;col;2012_11_10;0
68.7.....3..89......5..4...7...3.9....6...7....2....51.6..8.3.......1.4.........2;11.80;1.50;1.50;225579;col;2012_11_10;0
........1.....2.3....14.5....3.....6.5.7..4..8.......2..6..8..5.4.51.....9..7.1..;11.80;11.80;2.60;225581;dob;2012_11_10;0
For the last one the digit set would be 2,3,6,8.
BTW, the SK loop can also be described as a rank 0 logic with 16 cell contstraints as base and 4 boxes, 2 rows and 2 columns for 2 digits each as cover. I don't know if it was ever described like that.
In David's example that would be:
base: 2n2346, 7n2346, 1389n1, 1389n5 = 16 truths
cover: 15b1, 37b2, 37b7, 15b8, 48r2, 68r7, 48c1, 26c5 = 16 links