I'm know Bill and crew are good sailors so it leads me to believe more in that rating for the SC20TR. However, I know that standard SC20 is VERY tough to beat on corrected time. I've got a friend who owns one.

The thing has nearly the same sail area, same length, same weight, and is nearly 4 feet wider than my 6.0 but it's rating is a 68 compared to my 62.9. Go figure. However, the rating for the SC20 quickly drops as the Beaufort increases as that extra beam comes into play - but most regattas just use the DP-N which does give it an advantage.