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  Topic: 9 X 9
smith55js

Replies: 12
Views: 72519

PostForum: General discussion   Posted: Sat Dec 10, 2005 10:50 am   Subject: total possible sudoku grids
I ran across an interesting mathematical proof. It does require a bit of advanced understanding of math to follow along, but the number reached is quite large.

http://www.shef.ac.uk/~pm1afj/sudoku/s ...
  Topic: Sudoku Solving Techniques
smith55js

Replies: 1
Views: 30432

PostForum: General discussion   Posted: Fri Dec 02, 2005 1:16 am   Subject: Sudoku Solving Techniques
Just trying to get a good list of techniques people use in solving these puzzles. I'm looking for distinct, logical steps one can take.

For this I'll use the terms block, row, column, and group (3x3 ...
  Topic: Link back to main site
smith55js

Replies: 5
Views: 45442

PostForum: General discussion   Posted: Fri Dec 02, 2005 1:06 am   Subject: use of the 'back' button
A back button in a browser typically is only useful if one hasn't submitted any information to any 'forms'. Once this is done, the back button will want to know if you want to submit the information ...
  Topic: December 2nd - Hard
smith55js

Replies: 4
Views: 35276

PostForum: Daily Sudoku puzzles   Posted: Fri Dec 02, 2005 1:01 am   Subject: My solution...
1.1g8
2.2i3
3.7g5
4.7i2
5.7c1
6.7e3
7.7d8
8.2b1
9.8i7
10.9g2
4 in row 2 must be in box 1 eliminating 4's from rest of row 2
11.4f3
12.3g9
4 in column 8 must be in box 9 eliminating 4's from rest of co ...
  Topic: Dec 1, 2005 - Very Hard
smith55js

Replies: 6
Views: 47277

PostForum: Daily Sudoku puzzles   Posted: Thu Dec 01, 2005 10:24 pm   Subject: change in algorithm needed
Ok, so the difficulty is graded by a computer algorithm. It's apparent now that a change should be made. After doing different puzzles, some that are 'Very Hard' are in fact, Medium or Hard. Some ' ...
  Topic: Dec 1, 2005 - Very Hard
smith55js

Replies: 6
Views: 47277

PostForum: Daily Sudoku puzzles   Posted: Thu Dec 01, 2005 9:11 pm   Subject: Dec 1, 2005 - Very Hard
No, I really don't feel this one should have been labeled "Very Hard". It might be Hard, or maybe even Medium. There were only four moves that required any actual thought processes aside from lookin ...
  Topic: Dec 1, 2005 - Very Hard
smith55js

Replies: 6
Views: 47277

PostForum: Daily Sudoku puzzles   Posted: Thu Dec 01, 2005 2:00 am   Subject: Dec 1, 2005 - Very Hard
1.5i2 2.6d3 3.6b6 4.6f4 5.6h9 6.7g6
7.8i1 8.8f5 9.8c9 10.1g1 11.4h4 12.4g3
13.2f1 14.2h2 15.4b9

16.1b2 {3,9} in b1,a3
17.1a9 {3,9} in b8,c7

18.1e8 19.9d9 20.5g9 21.3f9 22.4f6 23.4 ...
  Topic: Nov 29, 2005 - Hard
smith55js

Replies: 19
Views: 91376

PostForum: Daily Sudoku puzzles   Posted: Wed Nov 30, 2005 10:28 pm   Subject: Nov 29, 2005 - Hard
I got step 10 but do not understand step 11.....

step 6 removed a 4 from possibilities for r2c9
step 9 removed a 2 from possibilities for r2c9
step 10 removed a 1 from possiblities for r2c9

leaving ...
  Topic: Nov 29, 2005 - Hard
smith55js

Replies: 19
Views: 91376

PostForum: Daily Sudoku puzzles   Posted: Tue Nov 29, 2005 2:55 am   Subject: Nov 29, 2005 - Hard
For anyone who needs help, here' s the solution and how I got it....

1.5i5
2.8e4
3.8b8
4.9d4
5.5f8 - R1C4, R1C6,R4C4,R4C6 force {7,9} to be in r7c5,r9c5, eliminating 1,2,5 from possiblities
6.4i1 - ...
 
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