Actually, the fact that he's had to answer this question so many times seems to indicate that the rules of matching, chaining, and scoring should be a little more transparent to the player. I totally get that the finer points of how the game works would be a massive information download for the player, but I feel like that sort of stuff should be in the game's Help function if you really want to read about it. Maybe not a complete breakdown of the exact algorithms for scoring, but at least an explanation of the basic concepts of chaining and when the matches clear, etc.
The fact that two consecutive matches the add up to 24 or more close enough together can give me the Bauer achievement is curious, because when I match 18 and then 3 in rapid succession, it doesn't credit me for Match21 at the end of the round. So theoretically, at least if I'm understanding this correctly, I could get Bauer without getting Match21. That seems counterintuitive.
I love that there's so much subtlety to this game in terms of different ways that high scores can accumulate for skilled players. I just wish the game itself explained these things a little better. (It's kind of like watching LOST and having to get the answers to your most nagging questions from the podcasts and other material outside of the actual episodes of the show.)