05/10/05 tough puzzle from sudoku.com.au
This one is equivalent to 05/09/24. Proof :
1) Take 05/09/24 grid. Now move rows 123456789 (1=bottom!) on new positions 987456321
2) Now move columns abcdefghi(a=left!) on new positions acbfedhgi. Do you begin to feel like déjà vu?
3) All that's left now is to renumber last grid's values 123456789 on 859427136 and you get exactly 05/10/05's puzzle.
4) Now applying the same "dictionary" (changing rows, columns, values) to proof of
09/24 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 :
09/24 , 09/25