Strategies for Number Puzzles of all kinds
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Sunday 26-Feb-2017

... by: JC Van Hay

#49 and #241 are isomorphs of tarek's Fata Morgana.

See andrew-stuart-weekly-extreme-unsolveable-sudoku-puzzle-t30514.html on the

Sunday 26-Feb-2017

... by: ray

1. Use only basic strategies and the bi-location cell set method. Start with C1{456} - bi-location cell for 4,tri-location for 4 and 6.Progressively form the
5-element bi-location cell set C1G67H7J5,forcing only the 1-cell to 5-cells run out values ,until C1G67H7J5 = (6,9,6,9,3) which gives the solution.
2. Using this solution,with basic strategies, the following non bi-location cell
set solutions were found: D79 = (4,3), ADE3 = (9,8,3), D3E4F3 = (8,4,7).
N.B: Using basic to extreme strategies(no Exocet), E3 3, E4 = 4 gave 1-cell solutions.

Saturday 25-Feb-2017

... by: rikroeger

I use single and Nishio
8<>r5c3 because 8=r5c3-->2=r5c9-->2=r6c6-->2=r7c4-->1=r8c4
- - > - - > 4=r8c7-->1=r9c1-->9=r9c4-->=r1c3
4<>r4c1 because 4=r4c1-->4=r6c6-->7=r6c7-->8=r6c8-->=r1c8
2<>r3c4 because 2=r3c4-->2=r5c5-->1=r6c6-->7=r6c7-->8=r6c8-->=r1c3
5<>r3c1 because 5=r3c1-->4=r8c6-->1=r9c1-->9=r9c2-->=r1c3
1<>r1c4 because 1=r1c4-->1=r5c5-->2=r6c6-->8=r6c8-->=r1c8

Saturday 25-Feb-2017

... by: jkl

# 49 to # 241 (1 to 9 becomes):
Rot.90clockwise 0
Renumb: 1 2 3 4 5 6 7 8 9
Columns: 9 8 7 6 5 4 3 2 1
& Rows: 9 8 7 6 5 4 3 2 1


Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
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