When investigating the 'Cross plus 4 dots' pattern brought up on the
How regular is to generate sudoku with difficulty 9+ SE? thread, I was surprised to find that my program, working in a particular mode, generated puzzles
always with the central point redundant. An example is:
- Code: Select all
4 . . . 2 . . . 6
. 5 . . . . . 8 .
. . 3 . . . 9 . .
. . . 1 . 5 . . .
9 . . . 0 . . . 4
. . . 6 . 8 . . .
. . 1 . . . 5 . .
. 8 . . . . . 7 .
6 . . . 3 . . . 2
This is SE 7.1 (I deleted a 9.1 by mistake
). Given how hard it usually is to generate 20-clue puzzles, I thought this might be of interest.
Regards,
Mike Metcalf