Extra Possibilities

List of contributions in 'Possibility Question'

Possibility Question contributed by bkprice

I have a question about possibilities. In this puzzle I am down to having only one possibility in Gi of 2. Since this is the case, why does Gh still show a 2 as a possibility?

Click here to download this puzzle

Any comments ? Click here to contribute

No Extras (re: Possibility Question) contributed by Huw

Well, you're right it does seem strange.

I think SudokuDragon should mark 2 as impossible in Gh because it is forced to go in Gi.

However, thinking about it that might mean you get lots of levels of inference that might seem complex. What I mean is that the fact 2 can't go in Gh then implies 2 must go in Cg as that's the only available option for a 2 in column g. Now as 2 goes here then that discounts 5,6 in the rest of column g. Do you catch my drift - the unravelling of possibilities could go on and on so a line has to be drawn somewhere... But I agree this one looks strange and probably should be marked.

Any comments ? Click here to contribute

Extras Soon (re: No Extras) contributed by SudokuDragon

Yes, I think this is something we'll add to the list of things to do for a subsequent release. No promises though.

Any comments ? Click here to contribute

Other threads in this forum
C Shape
Cycles and Twins
Difficult Puzzles to Solve
Is placing the correct candidates part of logic? (2745)
Is Sudoku a game Of mathematical symmetry?
Stripes
Three in a row (or column)
Trial and Error - The Labyrinth
Two out of three lines
X-Wing

Online Forums
Advice and Suggestions for using SudokuDragon
Big Grid
General Discussion about anything related to Sudoku
Help and advice on contributed Sudoku puzzles
Solution Strategies and Tips for Sudoku