05/10/04 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 987654321

[Maple Plot] [Maple Plot]

2) Now move columns abcdefghi(a=left!) on new positions acbfedhgi. Do you begin to feel like déjà vu?

[Maple Plot] [Maple Plot]

3) All that's left now is to renumber last grid's values 123456789 on 756123498 and you get exactly 05/10/04'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 equivalent puzzles : 09/17, 09/21, 09/28.

back to sandbox