05/10/07 tough puzzle from sudoku.com.au
This one is equivalent to 05/09/24. Proof :
1) Take 05/09/24 grid.
2) Now move rows 123456789 (1=bottom!) on new positions 789456123
3) Now move columns abcdefghi(a=left!) on new positions bacdefgih. Do you begin to feel like déjà vu?
4) All that's left now is to renumber last grid's values 123456789 on 689314725 and you get exactly 05/10/07's puzzle.
Now applying the same "dictionary" (rotating, 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 : 24-sept, 25-sept, 05-oct, 07-oct