My dad was a big crossword puzzler. I asked him if he thought that if you pick one of two possible answers to the first clue whether it would be possible to solve the entire puzzle one way or another way. He sat down and created a series of puzzles with "themes", e.g. "north", "south" or "Schiller", "Goethe", where all the major words were from one or the other theme.<p>Anyway, it would be interesting what the AI would do with this, would there be two hotspots in the solution space, one for each variant?