Strategies for Number Puzzles of all kinds
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Saturday 21-Nov-2015

... by: JC Van Hay

0. B7=3; Claiming(7C45)-7B45
1. The solutions of the Double Exocet (5689){A23, C78, Colums169} -> A9=1, C1=2, B45=12; -(89)D358, -(69)F2347, -(58)G247, -(56)J1248; -3F1, -7G9; G4=C5=7

The puzzle is now "solvable". Or ...

2. Swordfish(8)[C7=C6-D6=D1-G1=G9] -> C7=G9=8; G1=5, J1=3
3. B1=6 -> Singles to contradiction; F1=6
4. B1=8 -> Singles and Skyscraper(4)[F7=F4-H4=H8]-(4=1)D8 to contradiction; B1=9; 24 Singles
6. Skyscraper(4)[J5=D5-D8=H8]-(4=1)H4; Singles to the unique solution.

Saturday 21-Nov-2015

... by: ray

#1. Use only basic strategies throughout.Get working board and apply bi-
location tool.
#2. Choose E7{ 2456} - Bi-location cell for 5 and tri-location cell for 2 and 6.
Need to form,progressively,the 3-element bi-location cell set E7D8F4.Only
force the 1-cel to 3-cell run out values(no contradiction values) until E7D8F4
= (6,1,3) which gives the solution.Other bi-location set solutions found were:
B2E7F4J5 = (8,6,3,4) and DJ5E7 = (2,4,6).
#3 Using this solution,other 3-element non bi-location set solutions found
were: A4B45 = (9,2,1), B258 = (8,1,6), DHJ5 = (2,6,4).


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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