I feel you are not controlling for the most important variable in all of this... the user pool. I play the daylong MP tournaments multiple times per week. They are free, and easy to do. I have never played an ACBL tournament, and despite winning free entry in the spring ACBL tournament, I didn't play that either. I believe my competition is made up of a moderate size of relatively elite players, and a lot of people that are fairly subpar players, or not trying very hard. Indeed if I take my time and possibly even take notes during the hands about cards played, it is very rare that I will score under 65% or so, largely based on my understanding of how GIB works, as well as how to fool it. If unfocused, my results can vary a lot. There are different types of players in each tournament. I play exclusively online, and almost exclusively with robots. I imagine the population that played the spring ACBL were people far more likely to play in clubs or other tournaments. They likely had less inside knowledge about how GIB bids. I am not interested in ACBL tournaments and I do not buy into the point system (I won free entry to the spring ACBL but chose not to play since I'd need to become a member).