The outside boat can try to push the inside boat up but not so as to pinch him off completely, he must allow the inside boat room to round.

Now the debate I always hear at the mark is, "Hey, I need more room!!" from the inside boat while the outside boat is usually saying, "Get up, you have PLENTY of room!!" Obviously the outside boat wants the inside boat to have to round very tightly, to slow him down, so on exit the outside boat will have more speed and be able to get out from under him. For the same reason, the inside boat wants to take it a little wide, so as not to slow down too much, and keep the outside guy pinned under him, and not end up with a lee bow situation on exit. So there will always be discussion about what is "Seamanlike" in that situation. BUT, if there was NO overlap to begin with, then the inside boat can round as he pleases.