05/10/17 tough puzzle from sudoku.com.au
This one is equivalent to 05/09/28. Proof :
1) Take 05/09/28 grid.
2) Now move rows 123456789 (1=bottom!) on new positions 213456798
3) Now move columns abcdefghi(a=left!) on new positions higdefcab. Do you begin to feel like déjà vu?
4) All that's left now is to rename last grid's values 123456789 on 749681325 and you get exactly 05/10/17's puzzle.
Here is the dictionary which takes you from former puzzle to today's.
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Now applying the same "dictionary" (changing rows, columns, values) to proof of 05/09/28 you will mechanically get a proof of today's. E.g. first filled cell in 09/28 was "h2=8%block". It becomes "a1=2%block". 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.
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In case that you be lazy enough not to find it by yourself, here are hints for today's proof (automatically derived from 09/28's proof).
1) easy eliminations to 26 filled.
2) considering 7 in Bb2, 4 in Bb2, 9 in Be5, 37 in d7d9, remove some possibles : that will get to 39 filled.
3) considering 35 in g1g2, remove some possibles : will get to 54 filled.
4) Look at two possibles 4 in Ci, conclude that a7=4 anyway. Now to unique solution.