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Dice Roll	Size Class	Type
01-10	Small	Small shell keep
11-25	Small	Tower
26-35	Small	Moat house or friary
36-45	Medium	Large shell keep
46-65	Medium	Small walled castle with keep
66-80	Medium	Medium walled castle with keep
81-88	Large	Concentric castle
89-95	Large	Large walled castle with keep
96-00	Large	Fortress complex

What is the difference between a castle and a fortress in AD&D.
Simply, a fortress is more military.
Generally, castles are found within a civilized zone, whereas fortresses are found beyond the edges of a civilized zone.
This is an important bit of AD&D terminology.

<good idea, but is that right?>
<the above table does not seem to click with the implicit definition of castle & fortress, elsewhere in AD&D>
<example: say a roll on a MM2 table indicates a fortress, and I roll something other than a 96-00.>

To start, I think that the simplest thing would be to:
"put the castle images in one pile, and put the fortress images in one pile".
Then, sort things out.

Towers are easy !

+14 images at Tower
 

-	-	-	-	-	-	-	-	-
1.	S	-	-	-	-	-	-	-
2.	S	-	-	-	-	-	-	-
3.	S	-	-	-	-	-	-	-
4.	M	-	-	-	-	-	-	-
5.	M	-	-	-	-	-	-	-
6.	M	-	-	-	-	-	-	-
7.	L	-	-	-	-	-	-	-
8.	L	-	-	-	-	-	-	-
9.	L	-	-	-	-	-	-	-

107.

 

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65.

delete one of these two

65.

64.

63.
keep?

62.

61.
lots of towers: is there a keep?

60. Concentric castle

59.

58.
Large (Concentric castle)

57.
Large: Large walled castle with keep

56.
Medium: Large shell keep

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