I've decided that the extremely low density of one-option
multiplication clues is not a universally good idea after all: it
seems to me to make puzzles _quantitatively_ harder, even if Keen's
difficulty-level system can't see any difference in the set of modes
of reasoning required at least once to solve the grid.
So I've readjusted the clue selection, so that multiplicative clues
with only one workable pair of factors are restored to 'good' status
at Normal difficulty level and below, and only considered less-than-
fully-desirable at Hard and above. I think that's a reasonable
compromise.
[originally from svn r9170]
[r9165 == e7b2a9dd8d8915802fb69ce2242b1f913b7f3172]
intended behaviour of classifying multiplication clues as low-quality
if they only left one possible pair of multiplicands has never
actually worked, because I should have compared the possible clue
count against 2 rather than 1 since the multiplicands can occur either
way round.
[originally from svn r9165]
thereafter read. Most of these changes are just removal of pointless
stuff or trivial reorganisations; one change is actually substantive,
and fixes a bug in Keen's clue selection (the variable 'bad' was
unreferenced not because I shouldn't have set it, but because I
_should_ have referenced it!).
[originally from svn r9164]
state is in a solved position, and a midend function wrapping it.
(Or, at least, a situation in which further play is pointless. The
point is, given that game state, would it be a good idea for a front
end that does that sort of thing to proactively provide the option to
start a fresh game?)
[originally from svn r9140]
division clues were failing to light up as erroneous if the quotient
of the numbers in them came out right under rounded-down C integer
division (e.g. 2 and 5 would be accepted for a 2/ clue). Apparently
I copied the code that invents clues in the generator straight into
the solution checker, without remembering that the generator was
allowed to do it that way because exact divisibility had been
checked elsewhere.
[originally from svn r8951]
