> The cracker doesn't know going into it that I only have letters in my password, so he has to use any valid character.
Typically hackers will run through quicker combinations to pick off the low hanging fruit. It doesn't matter if they can't crack a few hundred 15 char characters with extended ANSI characters as by that point they'll already have tens of thousands of passwords from others who's passwords contained less entropy.
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> The cracker doesn't know going into it that I only have letters in my password, so he has to use any valid character.
Typically hackers will run through quicker combinations to pick off the low hanging fruit. It doesn't matter if they can't crack a few hundred 15 char characters with extended ANSI characters as by that point they'll already have tens of thousands of passwords from others who's passwords contained less entropy.