dailysudoku.com

I'm only pointing out duplicates, not passing judgement. It matters simply because its information and might suggest a problem in the author's puzzle generator.

Apologies if these have already been picked up, but the following classic puzzles are exact duplicates:

15/06/05 and 01/08/05 (already noted in a previous post)
01/10/05 and 03/01/06
02/10/05 and 02/ ...

It's interesting to see how you categorize the puzzles and grade them. I thought the Oct. 23 puzzle took a long time even though there weren't any difficult techniques required. My paper had a lot of ...

Thanks Sam. I actually wrote my duplicate checker for my own collection. My program creates new puzzles on the fly, but I wanted to ensure every one was unique. I tested the checker on your archive th ...

Thanks to all who responded.

To Sam:
OK, I now understand why some of your earlier puzzles have such odd gradings. But yesterday's medium (23rd October) had 28 clues and 53 naked singlets. How can th ...

You're right. I'm curious -- how did you ever notice that? dcb

There's only 276 files in the archive at present. That's just 37,950 individual file comparisons. I knocked up a C++ program in less tha ...

Can anyone explain how the author grades his puzzles? I ask because I've discovered several fairly obvious inconsistencies.

Example 1:
8th August - Easy
23rd August - Medium
Both contain 26 clues, 4 ...

The author should note that one of the puzzles has been repeated twice:

15th June 2005 - Medium
1st August 2005 - Medium

Sorry - I forgot to log in first. I am the guest, above.

I think it's fairly obvious that the puzzle is invalid. As it currently stands, it's impossible to solve.

Either the 7 in D2 or the 8 in F9 are incorrectly placed -- as they violate the rules of symm ...