Strategies for Number Puzzles of all kinds
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Sunday 21-May-2017

... by: ray

1. Use only basic strategies and the forcing bi-location cell setmethod.Start with cell H9{3489} - bi-location cell for 9,tri-location cellfor4.Progressively form
the 3-element bi-location cell set H9F1D7, forcing only the run out values for
1-cell to 3-cell values until H9F1D7 = (8,1,2) which gives the solution. Other bi-location cell set solutions found were: A3F1J5 = (3,1,1), F1H9J5 = (1,8,1).
N.B: Using basic to extreme strategies, A3= 3, H9 = 8 gave 1-cell solutions.
2. Using this solution, with only basic strategies, the following non bi-location
cell set solutions were found: G79J7 = (6,7,4), A9C59 = (7,4,3). N.B: Using
basic to extreme strategies,C9 = 3, A7 = 7,E8 = 8 gave 1-cell solutions.

Saturday 20-May-2017

... by: Paolo Calaresu

I use single and Nishio with only basic strategies.
If F7=4 -->contradiction--> F7<>4
If F9=4 -->contradiction--> F9<>4
If A4=8 -->Nishio contradiction-->D5<>2; D6<>2; D7<>7;E1<>(1,2);E5<>(1,2);
E7<>(2,7); E8<>(2,6,7); A2<>3; A3<>5; A5<>(3,9); A6<>9; A7<>6;B3<>(1,3); B4<>(1,3); B5<>(1,3);-->basic strategies-->fin x-wing (line 3 and line 9) fin C2=1-->B1<>1.

Saturday 20-May-2017

... by: jkl

isomorph to #205 (rotation 90 clockwise)

Saturday 20-May-2017

... by: R0D

Solved but nicely difficult - had to use colours to do it! Thank you! Nice to have these unsolvables back, they are appreciated. More please.


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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Page created on 03-May-2011, last modified on 03-May-2011.
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