Will enable this today...

John M .. and importantly, the US Rx allow many of its Rx's to be changed in the race docs ... but not this one. 

John, I absolutely agree with you about reasonableness in crossing situations and the like. Whether apprehension of a collision is reasonable must depend on skill level of both parties. We could even, maybe, argue that if an elite level competitor shaves inches crossing a novice that novice may be reasonably apprehensive of a collision even though another elite competitor would not be. 

But i still think this does not transfer across to the definition of room. The definition has nothing to say about the actual competitors. If we turn it round, and consider elite competitors, if in a mark rounding outside gives inside so little room that only an expert could navigate without contact then they have not complied with the definition, surely we agree on this. 

But lets look at it from another direction. If I am an elite competitor with a novice inside, what is required of me? I certainly have a reasonable apprehension of a collision if I only give as much room as a fully competent crew requires. And RRS14 means I must avoid that collision if reasonably possible, which certainly means giving more room than a competent crew would require. But does inside novice break RRS18 if  she sails outside the room a competent crew would be able to stay within? To my mind case 21 suggests she does. It lists all sorts of factors that affect what is room, but doesnt list competence. Indeed, it goes some way in the other direction with the phrase reasonable efficiency. Although I suppose you could argue that what is reasonable efficiency depends on crew expertise, I suggest that is requiring too much knowledge about the other boat.

Thank you Chin In.

This appears to be a very old conversation. While I loved Sail100 I have seen comments that it no longer works with the current versions of Excel. KSail is the current go-to platform for results services and very good at it. That said, I an not convincd that Swiss Lague does what it says. I am no mathemetician but the "shall not meet again" criteria does appear to be critical. It can result in a bounce effect, and we still get a number of matches which are not competitive. I have a sneaking feeling that the older system of grading competitors in a series of leagues and then going gold silver bronze leagues MAY have prodced better racing.