Comments on: An early crop of Sudoku http://bit-player.org/2006/a-new-crop-of-sudoku An amateur's outlook on computation and mathematics. Tue, 07 Feb 2012 08:15:15 +0000 http://wordpress.org/?v=2.6.3 By: Rijk Willemse http://bit-player.org/2006/a-new-crop-of-sudoku#comment-56 Rijk Willemse Fri, 07 Apr 2006 11:30:37 +0000 http://bit-player.org/?p=34#comment-56 I am addicted to Sudoku! I made an inventory of methods for solving even the most difficult Sudoku. Start with looking for duo's, it's an eye opener! Check http://www.sudokuhints.nl/en/ for details. Good luck! I am addicted to Sudoku! I made an inventory of methods for solving even the most difficult Sudoku. Start with looking for duo’s, it’s an eye opener!
Check http://www.sudokuhints.nl/en/ for details.

Good luck!

]]> By: Barry Cipra http://bit-player.org/2006/a-new-crop-of-sudoku#comment-44 Barry Cipra Mon, 27 Mar 2006 19:29:44 +0000 http://bit-player.org/?p=34#comment-44 Behrens's 5x5 array might be a nice place to study the problem of minimal clues. It was easy to reduce your mini-pseudoku to one with just 6 clues: <code> - 2 - - - 4 - 1 - 3 - - - 5 - - - - - - 3 - - - - </code> A little more work gets rid of the 5, still leaving a uniquely solvable mini-pseudoku: <code> - 2 - - - 4 - 1 - 3 - - - - - - - - - - 3 - - - - </code> Can anyone find one with fewer clues? (It clearly requires at least 4 clues, otherwise at least two numbers would be ambiguous.) Behrens’s 5×5 array might be a nice place to study the problem of minimal clues. It was easy to reduce your mini-pseudoku to one with just 6 clues:


- 2 - - -
4 - 1 - 3
- - - 5 -
- - - - -
3 - - - -

A little more work gets rid of the 5, still leaving a uniquely solvable mini-pseudoku:


- 2 - - -
4 - 1 - 3
- - - - -
- - - - -
3 - - - -

Can anyone find one with fewer clues? (It clearly requires at least 4 clues, otherwise at least two numbers would be ambiguous.)

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