The New Sudoku Players' Forum

[EnderGT]

Do any solvers out there look for uniqueness patterns for more than U4, i.e. U6 or U8? I found a U6 in this puzzle:

Code: Select all

5   7   6   | 3   8   1   | 9   24  24
8   19  12  | 4   6   29  | 3   7   5 
3   49  24  | 7   29  5   |*18 *18  6 
------------+-------------+------------
4   18  18  | 2   5   3   | 6   9   7 
9   6   5   | 8   1   7   | 4   23  23
2   3   7   | 9   4   6   |*15 *15  8 
------------+-------------+------------
7   5   48  | 6   39  489 | 2   348 1 
6   2   3   | 1   7   48  |*58 *458 9 
1   48  9   | 5   23  248 | 7   6   34

Obviously this is a simple Type 1, but for a U6 instead of a U4.

I also know that the puzzle solves with an XY-chain (r3c2-r3c5-r9c5-r9c9), and so the pattern isn't needed here, but it serves as an example none the less.

I haven't implemented Uniqueness Tests in my solver yet, but I'm wondering how common it is for solvers to look beyond U4.

[ttt]

Do any solvers out there look for uniqueness patterns for more than U4, i.e. U6 or U8? I found a U6 in this puzzle:

Code: Select all

5   7   6   | 3   8   1   | 9   24  24
8   19  12  | 4   6   29  | 3   7   5 
3   49  24  | 7   29  5   |*18 *18  6 
------------+-------------+------------
4   18  18  | 2   5   3   | 6   9   7 
9   6   5   | 8   1   7   | 4   23  23
2   3   7   | 9   4   6   |*15 *15  8 
------------+-------------+------------
7   5   48  | 6   39  489 | 2   348 1 
6   2   3   | 1   7   48  |*58 *458 9 
1   48  9   | 5   23  248 | 7   6   34

Obviously this is a simple Type 1, but for a U6 instead of a U4.
I also know that the puzzle solves with an XY-chain (r3c2-r3c5-r9c5-r9c9), and so the pattern isn't needed here, but it serves as an example none the less.
I haven't implemented Uniqueness Tests in my solver yet, but I'm wondering how common it is for solvers to look beyond U4.

Edit: By the way, this is old user EnderGT, still waiting for a password reset to get access to the old screen name.

Wow..., nothing new that's MUG
Edit: it's actually a BUG-Lite (thanks ronk)=> r8c8=4
BTW, welcome back EnderGT...!

ttt

[EnderGT]

Wow..., nothing new that's MUG => r8c8=4

Ok, glad to know it's already got a name. Thanks!