[ksudoku] [Bug 373840] In game "killer sudoku" there are multiple solutions

[Anton Artemyev]

https://bugs.kde.org/show_bug.cgi?id=373840

Anton Artemyev  changed:

   What|Removed |Added

 CC||anton.artem...@physik.uni-k
   ||assel.de

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[ksudoku] [Bug 373840] In game "killer sudoku" there are multiple solutions

[Ian Wadham]

https://bugs.kde.org/show_bug.cgi?id=373840

Ian Wadham  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |INVALID

--- Comment #1 from Ian Wadham  ---
In Killer Sudoku all the rules for Classic Sudoku apply, plus the numbers in
each cage must add up to the cage's total.

In the example you attached, you can apply the rule that the 3x3 boxes of a
Classic Sudoku must each contain the digits 1 to 9.

The number in column 1, row 3 must be a 4, not a 7, because there is already a
7 in the top-left 3x3 box. The number in column 1, row 4 must be a 7, not a 4,
because there is already a 4 in its 3x3 box... etc.

I am sorry the 3x3 boxes are not clearly marked in the Killer Sudoku.  I could
not find an easy way of doing that which would work with all themes on all
platforms and not look messy.  You must just imagine they are there.

Hint: Often a 3x3 box will be filled with cages, except for one cell. You can
then deduce that cell's number early in the game by subtracting the cage-totals
from 45 (the sum of the digits 1 to 9). Similarly, if a 3x3 box is covered by
cages and has one cell sticking out, you an subtract 45 from the total of the
cages.

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