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Topic: hard sudoku, "Platinum Blonde"
Replies: 16   Last Post: May 13, 2013 10:09 AM

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David Bernier

Posts: 3,370
Registered: 12/13/04
hard sudoku, "Platinum Blonde"
Posted: May 10, 2013 11:42 AM
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Rating Program: gsf's sudoku q1
Rating: 99486
Poster: coloin
Label: HardestSudokusThread-00078;Platinum_Blonde
[ from sudoku programmers pages ]


. . . | . . . | . 1 2
. . . | . . . | . . 3
. . 2 | 3 . . | 4 . .
-------+-------+------
. . 1 | 8 . . | . . 5
. 6 . | . 7 . | 8 . .
. . . | . . 9 | . . .
-------+-------+------
. . 8 | 5 . . | . . .
9 . . | . 4 . | 5 . .
4 7 . | . . 6 | . . .


ref.:

http://arxiv.org/abs/1208.0370

"The Chaos Within Sudoku" at arXiv,
Maria Ercsey-Ravasz, Zoltan Toroczkai;

They say "platinum blonde" is the hardest 9x9 on their rating,
that they found on collection puzzles.
They mention 49x49 sudokus, etc.

--> Platinum Blonde (the sudoku's given name)

Note:
http://www.dailysudoku.co.uk/sudoku/play.shtml ,
when asked to solve "Platinum Bonde",
says: "Difficulty: too hard"

david bernier



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