... by: ElceShould paragraph 2 read: " Our pivot chain for a y-Wing must proceed at an ODD number of POINTS (ie an EVEN number of LENGTHS between the points)" ?
Or have I missed the point!!
Thanks for your great tips - I am trying to use them to help me solve a hard (v hard!) samurai sudoku ie 4 sudocku with an interlocking central sudoku - any clues for this greatly appreciated!!
Andrew Stuart writes:
The old fence-post issue. I've reworded that sentence. Appreciated