What if the sudoku is 1 milllion lines by 1 million lines? How about a trillion by a trillion? The answer is still easy to check, but it takes exponentially longer to solve the board as the board gets larger. That's the jist of the problem: Is there a universal solution to a problem like this that can solve any size sudoku before the heat death of the universe?
Show me the collapse of a large governmental structure that wound up with a better replacement. France is on their fifth republic since the revolution. The liberal order is collapsing into authoritarianism and conflict. That will continue for some time I'm guessing.
Of course women want to be lost in a forest with a fabulous hairy gay man