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From kingofmycastle@gmx.net:
Interesting interpretation.

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From tek@evilsuperbrain.com:
You did that in five days? Wow!

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From tony@awmcs.net:
Nice Snail would have been great for the next round.

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From mark.wagner17@gte.net:
Nice "fortress on a mountain"

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From youknow@ucan.foad.org:
An interesting choice but... I don't know. I suppose it
is a mini-fortress in an odd way. 

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From wozzeck@club-internet.fr:
Hola Jaime, what a surprise! I would have never guessed that this was your production. Great idea indeed.

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From delfeld@mailcity.com:
How does this relate to the concept of fortress? Jaime Vives Piqueres' describes it as a "natural fortress" in the text file, but that is using the word in the definition, which does not elaborate anything.  A list of types of fortresses is not the same as defining the term.  Moreover, a fortress is not necessarily a shell. . . they may be two different concepts.