Sudoku is not just pleasure/pain, a morning wake-up or a diversion, but also an exercise in logic. When people make the same mistake in logic every time, what can the type of error reveal about the solver's brain?
i get your point, andrew. and i think anyone who has tried to change a long-term, semi-automatic behaviour knows how difficult it can be. perhaps that sort of behaviour is more nearly a reflex than a conscious choice?
example: i go downstairs. the upstairs light is on (switches on both floors). my hydro bill has gone up considerably so i want to minimize my usage. because i have, in twenty years, almost never turned off the light down there, i must remind myself to do so > learning a new behaviour.
it is considerably easier in the opposite direction, ie turning on the light before i go upstairs, because i also have a demonstrable clew or reminder to do so - the dark at the top of the stairs. going downstairs the light is behind me and i am much less likely to be reminded to turn it off.
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