05/10/06 tough puzzle from sudoku.com.au
This one is equivalent to 05/09/28. Proof :
1) Take 05/09/28 grid.
Now move rows 123456789 (1=bottom!) on new positions 897654312
Now move columns abcdefghi(a=left!) on new positions cbadefihg. Do you begin to feel like déjà vu?
All that's left now is to renumber last grid's values 123456789 on 186593274 and you get exactly 05/10/06's puzzle.
4) Now applying the same "dictionary" (rotating, changing rows, columns, values) to proof of
09/28 you will mechanically get a proof of today's. Try it !
See more illustrated examples of equivalence between puzzles : 09/26,09/29, 10/02, 10/03, 10/04.
See equivalent puzzles :
09/28 , 17-sept, 21-sept, 04-oct, 06-oct.