... by: asdfa

This is the Weekly unsolvable sudoku, rated above extreme. This is currently unsolvable by my solver, except perhaps with trial and error strategies. You will have few, if any, completed cells in Killer. Instead, groups of cells form blocks or cages and the clue is the sum of the solutions to those squares. Each cage is shown by a color or dashed line.
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... by: asdfa

Nice blog.
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... by: neo

My sudoku solver didn't have any problems with this one. A different program also tells me there is only one solution.

... by: Mark7

1A1, 2E5, 3G5 leads to logical solution

... by: newby

using 2 (E4, E5) and 9 on row E;
6 (B4, C5) and 6 (D9, E9) against (1,3,4)F1 yields:
2E5, 9E4, 6E9, 6B4, 4F1 solves

... by: ray

Billy Mac, please send me your system to: craynyl@gmail.com.

Thanks

... by: Billy Mac

I solved this puzzle, because I have been doing puzzles for about 10 years and I have diligently observed that there are 2-3 patterns that can be relied on to cancel numbers without seeing ahead of time the logical deduction. If you give me an email address I will send you the sequence of my entries, but I will not at this time reveal my patterns for elimination,
Sincerely, Billy Mac

... by: JC Van Hay

Re-Typo : read F1=4; UP30 :(

... by: JC Van Hay

Typo : read F1=1; UP30

... by: JC Van Hay

#1. All Cells Rank 0 Logic : the 15 cells ADFH1457-D1 are covered by the 15 sets 27RowA, 37RowD, 3RowF, 69RowH and 14Column1, 45Column4, 18Column5, 58Column7 :=> 24 eliminations : -27A29, -37D169, -3F8, -6H2 and -14DGJ1, -45BEG4, -18CEG5, -58CG7
:::. D1=6=F9, D7=7; UP24
:::. LC(3D45,3J89,6H45)-3EF45,3G789,6G45; Skyscraper(3BF1,3CF7)-3B89C2
:::. NT(135)E238-15E6; HT(568-1247)G23H2; NQ(2379)G1457-279G689; HT(237-1458)BCJ9
#2. F1=1or3->Contradiction(Singles) :=> F6=4; UP30

F1=1->A2=1,F4=4,F5=8,F7=3,F8=5=B6,C6=8,D6=1=H5,C5=6,B4=9,B8=8; Row A is devoid of 8 !
F1=3->F4=4,B2=3=E8=J9=C7,G7=2,H7=9,H4=6=B3,H5=1=D6,B6=5,F5=8=A7; Row B is devoid of 8 !

:::. ER(8F5=8F8-8BCB=8A79)-8A5; C6=8; UP31
:::. NP(27)A45-27A17B4C5; UP35
:::. UR(27)AE45=9E45-(9=7)E6; UP81

... by: ray

#1. Apply basic strategies and bi-location tool.
#2. Need to form, progressively, a 4-bi-location cell set E59G5J8. Forcing the various 4-cell values
gives inconclusions or contradictions untill E59G5J8 = (2,6,3,3) which gives the solution.
#3. Using this solution,with basic strategies, the following 2-cell solutions are found: GH4 = (7,4),
GH1 = (2,9), GJ1 = (2,7), D46 = 3,4), GJ6 = (1,9).

... by: newby

4H4, 3G4>contradiction
4H4, 3G5, 4D6, 4F1
6D9 inconclusive
6E9 solves