Last Updated：2022/12/24
If there are W_1 unchecked
whites (that is, those which enter into the solution of one clue only), and W_2 checked
whites (those which enter into the solution of two clues), then the mean word length will be (W_1+2W_2)/C, where C is the number of clues. […] Acceptable (if unwelcome) difficulties arise when the initial letters of words occupy unchecked squares, because no hint then derives from other clues as to how that word will start. In six consecutive crossword puzzles in The Times, 16 per cent of the words had unchecked initial letters.
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If
there
are
W_1
"unchecked"
whites
(that
is,
those
which
enter
into
the
solution
of
one
clue
only),
and
W_2
"checked"
whites
(those
which
enter
into
the
solution
of
two
clues),
then
the
mean
word
length
will
be
(W_1+2W_2)/C,
where
C
is
the
number
of
clues.
[…]
Acceptable
(if
unwelcome)
difficulties
arise
when
the
initial
letters
of
words
occupy
unchecked
squares,
because
no
hint
then
derives
from
other
clues
as
to
how
that
word
will
start.
In
six
consecutive
crossword
puzzles
in
The
Times,
16
per
cent
of
the
words
had
unchecked
initial
letters.
