...and here is another version from Baby-Rey Zaballero, a member of my Sudoku Puzzles Facebook group:
Saturday 30 June 2018
Solution to Puzzle no 222
Here is my original version of the solution:
...and here is another version from Baby-Rey Zaballero, a member of my Sudoku Puzzles Facebook group:
...and here is another version from Baby-Rey Zaballero, a member of my Sudoku Puzzles Facebook group:
Sudoku Puzzle no 222 (Diabolical)
Erick Middleton is a member of my Sudoku Puzzles Facebook group. He wrote a Perl script, which he used to create the puzzle below:
Solve online
See answer
Solve online
See answer
Thursday 28 June 2018
Monday 25 June 2018
Solution to Sudoku no 218
Here is my original version of the solution:
...then he asked his program to solve it:
I saw a tweet from Aditya Mathur saying that he had created a sudoku solver using recursion (this is where a program calls itself). I asked him to use it to solve this puzzle. First he keyed the puzzle in:
...then he asked his program to solve it:
Sunday 24 June 2018
Friday 22 June 2018
Solution to Puzzle no 216
Here is the original solution provided by my C program. Andrew Stuart's grader and solver was able to use logic to work out the answer:
Here is one of the online solvers which did not know how to solve the puzzle by logic. Click on the image to enlarge it and bring it into focus if necessary:
Here is one of the online solvers which did not know how to solve the puzzle by logic. Click on the image to enlarge it and bring it into focus if necessary:
Sudoku Puzzle no 216 (Tough)
My C program created this puzzle and I keyed it into Andrew Stuart's grader and solver. It gave the puzzle a grade of Tough. Then I went through the solution with the Take Step button and I saw that the puzzle used a solving method I had never seen before. Andrew Stuart calls it a BUG or Bi-Value Universal Grave. Click on the Solve Online link below to see it in action. Two other online solvers said that it could not be solved by logic. I posted it on my Sudoku Puzzles Facebook group and a couple of the members replied saying that they had finished it. Try it yourself and see what you think:
Solve online
See answer
Solve online
See answer
Wednesday 20 June 2018
Monday 18 June 2018
Sunday 17 June 2018
Saturday 16 June 2018
Sudoku Puzzle no 212 (Tough)
Erick Middleton is a member of my Sudoku Puzzles Facebook group. He wrote a Perl script, which he used to create the puzzle below:
Solve online
See answer
Solve online
See answer
Thursday 14 June 2018
Monday 11 June 2018
Saturday 9 June 2018
Sudoku Puzzle no 207 (Moderate)
Erick Middleton is a member of my Sudoku Puzzles Facebook group. He wrote a Perl script, which he used to create the puzzle below:
Solve online
See answer
Solve online
See answer
Thursday 7 June 2018
Solution to Puzzle no 206
Here is my original version of the solution:
...and here is another version by Baby-Rey Zaballero, a member of my Sudoku Puzzles Facebook group:
...and here is another version by Baby-Rey Zaballero, a member of my Sudoku Puzzles Facebook group:
Tuesday 5 June 2018
Monday 4 June 2018
Sudoku Puzzle no 204 (Tough)
Erick Middleton is a member of my Sudoku Puzzles Facebook group. He wrote a Perl script, which he used to create the puzzle below:
Solve online
See answer
Solve online
See answer
Sunday 3 June 2018
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