I understand my comments not related to your post but I just came across your blogpost on http://www.barneyb.com/barneyblog/2008/02/28/read-only-and-read-write-svn-repositories/. But realized the thread as well as the site is not active anymore.

I’ve got both authentication and authorization working as they should be in my setup. However, path based restrictions don’t seem to work for sub folders. Please see Authz snippet below:

[groups]
ctrlMusers = user1, user2, user3

[/]@ctrlM = r

[SVNCOPY:/ControlM]
@ctrlM = rw
@developers = r
* =

From the above, I’m restricting write access only to ctrlMusers. But sadly, ControlM folder has too many sub directories (SVNCOPY/ControlM/trunk/AciCore/build/release1)

user3 is not able to commit a file under SVNCOPY/ControlM/trunk/AciCore/build/release1 even though he has RW access at the parent folder level (ControlM). How do I go about resolving this issue? Thanks.
Karthik

There is a well known story about Karl Friedrich Gauss when he was in
elementary school. His teacher got mad at the class and told them to
add the numbers 1 to 100 and give him the answer by the end of the
class. About 30 seconds later Gauss gave him the answer.

Looking at your triangle it clicked.
1 + 2 + 3 + … + n

If you take the sequence and add it to the reverse sequence, shown below…

1      2    3    4    5    6    7    8    9   10   11   12
+    +    +    +    +    +    +    +   +     +    +     +
12   11  10   9    8    7    6    5    4     3     2     1
=
13   13   13   13   13   13   13   13   13   13   13 =  12(13) = 156 or n(n+1)

which is double the total, so take 1/2 of that to find the total = 78
78 != 91 so this made me go, hmmm
But, since the dominos are 0 based, it really is 1+…+13 so plug in 13 for n

13(14)
--------      =  182/2 = 91
2

Math is cool.