Chess Flint?

[catherine at cator-manor.demon.co.uk]

No: HPFGUIDX 19032

--- In HPforGrownups at y..., "Doreen Rich" <nera at r...> wrote:
> I know what a "flint" is ... but why is it called a "flint"?
> 
> Doreen

Because the most obvious mistake JKR ever made, was putting Marcus 
Flint in the 6th year in PS - and he is still there as captain of the 
Slytherin Quidditch team in PoA, when he should have left the school 
by then.  So mistakes are now referred to as "Flints."

BTW: re the chess.  Seeing as this has come up, there is another line 
I noticed which doesn't make sense:

Ron:  "I take one step forward, and she'll take me - "

and then: "He stepped forward and the white queen pounced."

I know this is probably just figure of speech, but it has always 
annoyed me - Ron is a Knight, and they don't move forward one step at 
a time - they move 3 forward, 1 across.  So another flint, or 
imprecise language?  Or am I just being too nitpicky?

Catherine