I would say 2019 is a good game to look at. It is not too old, so it uses the same general system of ranking points and it has some bizarre defense rules specific to the season
If you want to go really old the 2000 game (Co-opertition FIRST) is a personal favorite of mine, it has a lot of unique aspects (the biggest being descoring of the opposing alliance’s pieces) that I would really love to see done again in a more modern FRC game.