help

[wacfwaef]

Hi, any way to solve this one without the "try and error" approach?
Doesnt seem possible as there is no pattern whatsoever

[zenobia43]

In the second row, fifth column, the candidates are a 1 and 4. If the 1 is chosen, there will be a chain of eliminations that will lead to the 8 in the fifth row, fifth column being eliminated. That will eliminate both candidates in that box which violates a constraint.

The 1 in the fifth row, fifth column is eliminated by the 1 that was chosen, and the 8 is eliminated by the 8 in the fifth row, seventh column.

The big clue here is that there are a lot of rows, columns, and boxes that have only two 1s. That means selecting a 1 somewhere is going to cause a chain reaction which either violates a constraint or is part of the solution. Any 1s that are part of the chain that violates a constraint can be removed.

I guess this could be called a guess and check move instead of pure deduction, but if the definitions of such things are flexible, maybe not.

There is a pattern. Many rows, columns and boxes have candidate pairs where if one is eliminated, the other has to be the solution.

[Ozman]

Hi does anyone one know what this " implode(): Argument #1 ($array) must be of type array, string given"error means , i am getting it when clicking submit after finishing a sudoku ?/

[admin]

This should be fixed now - thanks for catching this bug! Please let me know if you continue to experience any problems.

[Toebirds]

That's the exact same thing I've been getting over in Crossworders every time I finish. Hasn't recorded my scores at all.

[Wish]

Why can't I see the number keys in sudoku?