How to detect quickly that to grids are not iso morph?
This method donesn't not say if they are isomorph it says thet they are not isomorph.
1- Two isomophs have always the same repartition of clues by box
for a block
If the first box have 2 clues, the second 5 and the last1 you can scrambe the grid , swap the digit. at end you still have a blockw'perhaps vertical) with the same clue repartition.
Not in the same colonnes, in yhe sme row , not with the same digit
but the same number
2- More speed: the repartition by box on all the grid is constan
If you have 4 clue box 1, 3 clue box 2, 3 3, 4 4, 1 5 ,6 6 ,0 7,8 8,6 9
You still have the same after swap, rotations or other
Bware iit's not because the repartition is tha same taht the grids are isomorph. The method id for detect no isomorph!
Programers use other way to c14 and detect isomorph but this method can be use with out computer.
Papy.
