Candidates can be Edited
Highlighted
Coloured,
Shown
1
2
3
4
5
6
7
8
9
Set cell colour
Symmetrically
Enter clues
or solutions
Use 3D chains
Help with candidate chains
Click on any candidate in the board. The solver will set that candidate as true and turn
false all the candidates it can see in the row, column and box. It will then look at all those
in turn and follow every inference, ON, OFF, ON, OFF until it can go no further. A network of chains will be built up that could
help you solve a difficult point in the puzzle.
'Use 3D chains' means to follow the chains within a cell. The 'third' dimension of the candidate spread.
Use the [SHIFT]+(click) on another candidate to add another set of chains to the board. Otherwise the previous chain will be cleared.
If you click the same candidate it will change from true to false and
the links will be tested again with that inference. All chains will only explore un-chained candidates, ie they will not join up.
Quick Rules:
Rows and columns are divided into compartments of white squares.
Use single numbers to complete a straight for each compartment.
A straight is a set of numbers with no gaps and in any order.
No single number can repeat in any row or column.
Clues in black cells remove that number as an option in that row and column,
and are not part of any straight
What's 'A' and 'B'?
I've split these strategies into two. The first time they are called - 'A', they only look for
eliminations which return a solution for a cell, ie one number is left. This focuses the
solver on the shortest path. If this fails, 'B' is called, which returns all eliminations, if any
are possible.
Please report any bugs. Tested in IE, Firefox, Safari and Opera
If you are getting errors please clear your browser cache to retrieve the latest script files
Solver created on 21-Nov-2008. Last updated on 26-Jul-2024.
All puzzles on this site are trademarked and patented and cannot be reproduced without permission.
Copyright Andrew Stuart @ Syndicated Puzzles, Privacy, 2008-2023
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