Not singling you out....just quoting you to explain to several of you who are obviously not familiar with the apa 9 ball scoring system. Also to clarify that the 2 was playing a 4 ...not a 6 as a few apparently misunderstood.
A 2 goes to 19 points
A 4 goes to 31 points.
The fewer points you allow your opponent the higher your score is.
A total of 20 points is available each match. The points are awarded on a sliding scale from 20-0 to 12-8.
The op said the 2 won 20 -0 . That means the 2 scored 19 points for the win and held the 4 to between 6-8 points
A few examples of the sliding scale. The 2 wins 19-11. The score would be 19-1. The 2 wins 19- 28. The score would be 12-8 .
During regular session you play 5 matches with a total of 100 points available. At the end of 5 matches the team with the most points wins. During playoffs or higher the matches stop when one team reaches 51 points as there is no way the other team could win. During regular session you continue playing regardless of what the score is because the points are applied to your team total for the session and not playing one match could be the difference between first or 2nd place at the end of the session.
The OP said that he (the OP) is a 6 and that the guy played shape better than he (the OP) does.
Thanks for correction on the scoring. I don't get it, but it certainly seems convoluted. First you play 9-ball for points (weird enough), but then the points don't mean anything and get converted to other points. Cool.