On 11/02/2016 00:04, Mike Barnes wrote:

No you don't, but if you did, so what? Both methods tell you that the
length is eight or more,

Not necessarily. One that presents a picture of all the character
positions does. One that asks for three random character positions often
won't - it might wan characters 1, 2 and 4 for example.

so there's no difference in the amount of
information divulged. But there's a considerable difference in
usability, because one method requires you to count and spell at the
same time, and the other doesn't.


If you are going to use that technique, then put up a line of say 15
boxes every time, and highlight the cells you want. That way you give
away less.



--
Cheers,

John.

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