For the benefit of our new members:

o A round robin is a way for a group of collectors to trade
o Someone starting a round robin solicits participants on this bulletin board
o Once there enough participants, the round robin begins by the starter sending a group of items (in this case, chips) to the 1st participant
o Each participant can select as many of the items as they want, replacing each item with another item of similar (or greater) value
o The participant then sends the round robin on to the next participant until it finally returns home

Pretty simple.