Out of Place "Too Difficult Sudoku" Error

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rep'nA
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Joined: Fri Jan 19, 2007 11:37 am
Location: Union City, California

Out of Place "Too Difficult Sudoku" Error

Post by rep'nA »

I've inserted via cut and paste and via manual entry the following puzzle into SudoCue:

..84.2....2....1..4....562.1..34.7.9...2.9...3.9.17..6.419....2..5....8....5.14..

SudoCue gives the "Too Difficult Sudoku" Error and once I hit OK, it will declare the puzzle to be invalid. All techniques are turned on. What seems to be the relevant solver order choices are:

Skyscraper
2-String Kite
X-wing

If I switch the solver order to

X-wing
Skyscraper
2-String Kite

then SudoCue gives no such error message and declares the puzzle to be valid and solves it with no problem.

Any thoughts?
"Obviousness is always the enemy to correctness."-Bertrand Russell
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