To take the offense.
I created 20 random scores.
I looked up the way that the CONGU does handicapping. I assumed the first three scores were the ones used to create the player's initial handicap. I then applied their rules Handicap Adjustment rules using the next twenty scores. I did this three times with the same scores, but each time I changed my starting point.
I got three different handicaps, 3.5, 4.6 and 5.5, based on which point I started.
Under the USGA Handicap system the player's handicap was 3.9 regardless of which scores were posted first or last.
Here were the twenty scores. I assumed a course rating (SSS) of 72.0 and a slope of 113:
78, 75, 74, 79, 82, 76, 77, 73, 78, 82, 81, 76, 79, 80, 83, 92, 84, 84, 82, 75
The first time I calculated them in the order presented. The second time I started with the 78, 82, 81 sequence and wrapped around to finish with 76, 77, 73. Third time I started with the 92, 84, 84 point and wrapped around.
It is possible I made a couple of errors, as I was in a hurry, but I don't think they were significant.
So what is the players handicap under CONGU? Well, it depends on what order you shoot the scores. Obviously if you are establishing a handicap, shoot three high scores to start it and then get better.