D&D 2E Convert AD&D 2E to 2d10

[jaz0nj4ckal]

Folks:
Has anyone converted AD&D 2E to use 2d10? I am trying to wrap my head around how this would be done.

So far I have something like this
=========================
dice........=%......<%......>%
2...........1.0.....1.0.....100.0
3...........2.0.....3.0.....99.0
4...........3.0.....6.0.....97.0
5...........4.0.....10.0....94.0
6...........5.0.....15.0....90
7...........6.0.....21.0....85
8...........7.0.....28.0....79
9...........8.0.....36.0....72
10..........9.0.....45.0....64
11..........10.0....55.0....55
12..........9.0.....64.0....45
13..........8.0.....72.0....36
14..........7.0.....79.0....28
15..........6.0.....85.0....21
16..........5.0.....90.0....15
17..........4.0.....94.0....10
18..........3.0.....97.0....6
19..........2.0.....99.0....3
20..........1.0.....100.0...1

AD&D 2E.......2d10
-2...............+1/-1 for hard
-4...............+2/-2 for harder
-6...............+4/-4 for harder level 1
-8...............+6/-6 for harder level II
Note: Base target is 11+, since the base THAC0 is (20-AC of 10)=10+ or 55%