Extremely Difficult

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Extremely Difficult Grids

Postby Bear » Mon Nov 03, 2008 10:24 am

The following site has extremely difficult grids (XDGs)
They call them "very hard" but they require x-Wing & 1st & 2nd order swordfish
(2nd order for me means a 2nd complete check for patterns after a complete 1st pass w/ all chains cleared)
Unfortunately there are only 18 unique grids on that site.

So i came up w/ an algorithm for XDGs (all logic bound)
I now have 800+ million XDGs. Not free.
I also have an MS Access Sudoku Helper
It does not solve the grid, it only assists
in the identification of patterns by highlighting. Not free.
XDGs & associated algorithms are not for the faint hearted
so don't try their 18 freebies @ home, i'm a professional (OK, now LOL)
Posts: 2
Joined: 30 May 2008

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