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## ... by: ray

#1 Use basic strategies to get a working board , and apply bi-location tool.
#2 Choose cell A4{2458] - bi-location /tri-location for 5. Need to form,
progressively, a 4- element bi-location cell set {AC4FJ3}. Forcing the
various 1-cell to 4-cell values gives contradictions and inconclusions;
only use basic strategies and force the only 1-cell to 4-cell inconclusive values until AC4FJ3 = {4,2,7,5} which gives a solution.N.B: there are other 4-element bi-location cell sets which also give the same solution.
#3 Using this solution,with basic strategies, no 1-cell or 2-cell solutions
were found; the following 3-cell solutions: ABC4 =(4,7,2), AB4C5 =
(4,7,1), A4BC5 = (4,8,1).

## ... by: newby

A8=8, C1=7
using (5.6)E1, (1,6)E8, 9(D3, E3), 4(G1, J3): 1E6, 6E1, 9D3, 4J3 solves

## ... by: JC Van Hay

Like puzzle #155, this puzzle is solvable after the exclusions of the double exocet : Base Cells (2346)A23 [ Target Cells B8 and C6], Base Cells (2346)C89 [ Target Cells A6 and B1], (2346)Columns168 : -(2346)A8, -(2346)C1, -(2346)DEGH234579.

## ... by: Andrew Stuart

I'm pleased to write that I have some more unsolvables from David Filmer. Many thanks David. The standard is now very high, but I'll continue to add a few of my own as well if the generator can find any. Share and Enjoy

## Archive

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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