The information I have is from your profile => score history. It contains the last 200 strokeplay, CTTH and Blitz results. From there I copy&paste it to Excel, calculate the 18 hole scores, sort them and do the average. O. will do it similar, and you can do it, too.
Regarding your average moves:
There was an
* Average before game = 66.37
A 35 / 70 score brought it to 66.44.
Then you played a 32 / 64.
* Average after game = 66.39
(* from your original posting)
You just missed that there were two games between the given average numbers.
Here are your numbers (51 scores). The average is calculated from the bottom up, and you see that there is a 66.44 between the two numbers you mentioned.
Date Holes Score 18L-Score ave.
07.17.12 Front 9 32 64 66,39
07.17.12 Front 9 35 70 66,44
07.17.12 Back 9 32 64 66,37
07.17.12 Back 9 32 64 66,42
07.17.12 Back 9 36 72 66,47
07.16.12 Full 18 70 70 66,35
07.15.12 Full 18 67 67 66,27
07.15.12 Back 9 33 66 66,25
07.15.12 Back 9 33 66 66,26
07.14.12 Full 18 67 67 66,26
07.14.12 Back 9 32 64 66,24
07.13.12 Back 9 33 66 66,30
07.13.12 Front 9 30 60 66,31
07.12.2012 Front 9 34 68 66,47
07.12.2012 Back 9 35 70 66,43
07.12.2012 Full 18 69 69 66,33
07.11.2012 Back 9 31 62 66,26
07.11.2012 Front 9 33 66 66,38
07.11.2012 Back 9 32 64 66,39
07.10.2012 Front 9 34 68 66,47
07.09.2012 Back 9 34 68 66,42
07.09.2012 Front 9 35 70 66,37
07.07.2012 Front 9 33 66 66,24
07.07.2012 Back 9 33 66 66,25
07.07.2012 Front 9 32 64 66,26
07.06.2012 Front 9 32 64 66,35
07.06.2012 Back 9 33 66 66,44
07.05.2012 Full 18 66 66 66,46
07.04.2012 Full 18 65 65 66,48
07.04.2012 Back 9 31 62 66,55
07.04.2012 Full 18 68 68 66,76
07.04.2012 Full 18 69 69 66,70
07.03.2012 Back 9 34 68 66,58
07.03.2012 Back 9 34 68 66,50
07.03.2012 Front 9 35 70 66,41
07.03.2012 Full 18 65 65 66,19
07.03.2012 Back 9 31 62 66,27
07.03.2012 Front 9 35 70 66,57
07.03.2012 Back 9 32 64 66,31
07.03.2012 Back 9 34 68 66,50
07.02.2012 Back 9 32 64 66,36
07.02.2012 Front 9 32 64 66,60
07.02.2012 Front 9 35 70 66,89
07.02.2012 Front 9 33 66 66,50
07.02.2012 Front 9 35 70 66,57
07.02.2012 Full 18 68 68 66,00
06.30.12 Front 9 33 66 65,60
06.30.12 Front 9 34 68 65,50
06.29.12 Back 9 32 64 64,67
06.29.12 Front 9 33 66 65,00
06.29.12 Front 9 32 64 64,00