Ok we now know that the outside boat should have given room, well I think we have. I had an almost exact same scenario recently with a Mustoo skiff at a mark, we both arrived in the zone almost simultaneously and yes as he was the slower boat ( just ) I gave him room to round the mark.

But these skiffies are incrediably competative and he carried on straight ahead to ensure he slowed me down over the water enough to win on handicap ( yes these top class sailors do think of these things ). My question is at what stage can I just luff him up because he's being a prat or can he, as he did, just carry on straight ahead ( which incidentally let 3 other boats through behind.