dailysudoku.com

[aman]

With my friends and even some strangers, I have discussed the problem of my sudoku variants popping up here and there like mushrooms on some websites, in books and some international championships. Among them, the opinion of one person, who has a deep interest in Zen, is particularly interesting.

I almost fell off from my chair when he said that such happening shows that my sudoku variants are a great success and it should be viewed as a positive development. He said that my task is to make it "more positive" by thanking whoever is interested in my sudoku concepts and encouraging him to use more of my ideas, whether on websites or in books! He said that I cannot force others to advertise for me, but others cannot stop me from advertising myself . He said I can never stop others from using my ideas, and similarly others can never stop me from trying to get the maximum benefit out of the whole situation.

Now I am putting the advice of that "Zen master" into practice to see how successful it works.

First I have to thank http://www.sudokumasters.in for using my idea of "Twin Corresponding Sudoku" in its so-called "Substitution Twin Sudoku".

I also have to thank http://wsc2008.com for designing a so-called "Group Sum" which is identical to my "Corner Squad Sudoku" in http://www.ageofpuzzles.com/Collections/CornerSquadSudoku/CornerSquadSudoku.htm except that the small clue-numbers in the "new" puzzle are circled.

An article in http://www.notelay.com/articles/did_you_know/what_is_sudoku/ has this interesting comment about sudoku: "Because Sudoku is logic-based, other puzzles could be created that use the same concept and replace the numbers with other objects, such as colours, letters or shapes."

I have used graphics, Chinese words and the alphabet for my Twin Corresponding Sudoku. Please refer to the following websites:

http://nrich.maths.org/public/viewer.php?obj_id=5518

http://www.ageofpuzzles.com/Collections/TwinSudokus/TwinSudokus.htm

http://www.chinasudoku.com/

I have to thank http://wsc2008.com for designing its so-called "Alphabet Substitution Twins". Whatever name the "new" puzzle is called, it is still identical to my "Twin Corresponding Sudoku".

Finally, I hope more people will use my sudoku ideas freely on their websites and in their books, but at the same time as the Chinese saying goes, "remember the source whenever you drink water", so please don't keep me totally out of your limelight.

[aman]

For the second year in succession, my sudoku variants were used in the Czech National Sudoku Championship. One of the my 10 sudoku variants used in the Czech National Sudoku Championship 2009 is a new variant called "Rainstorm Sudoku".

It is found in http://nrich.maths.org/public/viewer.php?obj_id=6547

[keith]

It seems to me that the Foxtrot "Sudorku" belongs in this thread.

http://blogs.sun.com/dlacher/entry/sudoku_or_sudorku

Keith