Challenge 1 (difficulty: easy)
These 2 Sudoku grid shares one chess-related special property. Can you identify it?
Code:
426759183
318642975
597831264
183426759
975318642
264597831
759183426
642975318
831264597
657324981
432198765
819576243
981657324
765432198
243819576
324981657
198765432
576243819
Challenge 2 (difficulty: medium)
Change
6 cells in each of the 2 grids in
Challenge 1 to obtain 2 other grids which have the same chess-related property.
Challenge 3 (difficulty: hard)
There is a 5th grid which also has the same chess-related property. It is obtainable by changing
65 cells in either one of the 2 grids in
Challenge 1. Can you find it?
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