The Times Deadly Killer Sudoku 2179 10th September 2011
Could I have some help on solving this puzzles as I don't understand the advanced strategies that I need to solve this puzzle. I have tried using the rule of 45, definite sums and other basic techniques, but this is how far I can go, when explaining the advanced techniques, could the explanations be easy to understand please? As I don't understand them. All help will be appreciated.