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Friday 12-Feb-2016

... by: S K JAIN

I have written a sudoku solver software that can solve the sudoku puzzles from pure logic. I have implemented most of the widely used sudoku techniques (including the very advanced techniques). It can solve the hardest and toughest sudoku from pure logic (with the help of Adrianne's thread technique when the sudoku is stuck and all other techniques fail). You can download the source code for free for the sudoku software for free from my website. The website is :

Tuesday 9-Feb-2016

... by: anybody1

1/B7 8/D4 8/H3

Monday 8-Feb-2016

... by: ray

If the Solver's basic to extreme are used, E6 = 7,F5 = 9, A1 = 7 and F1 = 2
give 1-cell solutions.

Sunday 7-Feb-2016

... by: JPF Naperville IL

Solved using only basic steps 1-6 in the solver via a combination of 7 in E6,
9 in F5, and 9 in H4.

Sunday 7-Feb-2016

... by: ray

1. Use only basic strategies throughout.Get working board and apply bi-location tool.
2. Choose A9{1237} - bi-location and tri-location cell for 7.Need to form,
progressively,the 3-element bi-location cell set A9E6H2.Only force the
1-cell to 3-cell run out values(no contradiction values) until A9E6H2 = (3,7,3) which gives the solution;other bi-location set solutions were found:
A9C8E6H2 = (3,8,7,3).
3. Using this solution, other non bi-location cell solutions found were : AF1H2 = (7,2,3); no 2-cell or 1-cell were found.

Saturday 6-Feb-2016

... by: JC Van Hay

0. C3=E6=E7=H8=4; Claiming{6Col5} -> -6GHJ46

Exocet (2579){DE2,RowsBFJ}; Base cells : D2.E2; Target cells : B3.J1
A solution of D2 or E2 excludes the same digit from AC1 and GH3

2. DE2=ab -> -(ab)AC1.GH3 and 0 solution via singles except if ab=95; 28 singles
3. XYWing(138)A9.BG7-3A7; singles to the end of a unique solution


Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
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