05/10/09 tough puzzle from sudoku.com.au

This one is equivalent to 05/09/24. Proof :

1) Take 05/09/24 grid, exchange rows and columns.

[Maple Plot] [Maple Plot]

2) Now move rows 123456789 (1=bottom!) on new positions 978456231.

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

[Maple Plot] [Maple Plot] [Maple Plot]

4) All that's left now is to rename last grid's values 123456789 on 982516437 and you get exactly 05/10/09's puzzle.

Now applying the same "dictionary "(graphically summarized) (rotating, changing rows, columns, values) to proof of 09/24 you will mechanically get a proof of today's. Try it ! Or see the method explained step by step on 10/08 example.

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
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