Example of Impossibles in Groups
This is a version 14.0 screenshot
Impossibles in Groups:
This removes all possible solutions due to the size of the Killer Group they are in. For example:The two-square Group on H9 and J9 sums to 15. Any possible less than 6 can be eliminated.
The two-square Group on F9 and G9 sums to 12. Any possible less than 3 can be eliminated and any possible equal to half the total (ie 6) can be eliminated since it can only appear once in the Group.
The three-square Group on G2, H2 and H3 sums to 7. Any possible greater than 4 can be eliminated.
If one of the Squares in a Group already has a Solution, this analysis will remove all other possibles of the same value in other Squares of the Group.
The analysis will also remove any impossible combinations within two-square Groups. Impossible combinations in Groups of size three squares or larger is left to the dedicated Impossible Combinations analysis.
Same example with Impossibles in Groups analysis turned off
This is a version 14.0 screenshot
In this screenshot, the Impossibles in Groups analysis has been turned off, so you can see the before and after effect of this analysis.