Strategies for Number Puzzles of all kinds
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Monday 1-Sep-2014

... by: money mutual

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Saturday 30-Aug-2014


A solution was achieved using only solver steps 1-6 as follows:
1candidates were entered
2.steps 1-6 added 6 fill-ins
3.focused on the quint in col 1
4.entry of a 6 in cell H1 solved the quint and gave 5 fill-ins
5.use of steps 1-6 only led to the solution.

Saturday 30-Aug-2014

... by: JC Van Hay

1. Subsets + Claimings; UP28
2. Analysis of the puzzle from the hub cell G3 : (125)G3=[1G5 AND 2G9 AND 5H1F3]

G3=1 -> contradiction(singles)
G3=2 -> contradiction(singles) via Claiming(1DF8)-(1=8)E7
G3=5 -> UP41

3. ALS-XZ Rule : [(8=67)BH1-(7=1348)H789J8]-(8=9)B8; UP81

Saturday 30-Aug-2014

... by: ray

#1. Use basic strategies bi-location/bi-value tool to get working board.
#2. Select cell H1 - bi-location cell for 5,tri-location for 6. Forcing H1 =5
gives an inconclusion; forcing H1 = 6 gives the solution.
#3. Using this solution,with basic strategies, other bi-location 1-cell solutions
found are: B9 = 6, A4 = 8; some 2-cell solutions found are: D12 = (5,2),
H2J3 = (1,2), J8 G3 = (8,5), AC7 =(7,8).


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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