All rating rule have holes and weakness, that’s why designers get paid, to find the softness in a rule and exploit it. You will never get a rule like SCHRS or Texel to totally predict the performance of a cat with the limited information provided, have any of you seen the amount of information that goes into a top of the range VPP program and even with that it’s dead easy the bend the performance to what you want to see. We just have to relies that some boats will get nailed and some are on the pigs back, at the moment it’s favours heavy-ish powered up boats, but like all these things the pendulum will swing back and you will have the other group bitching about there rating, it’s all a matter of When. I think Texel and SCHRS has done a good job with the few basic dimensions to get boats on the water and racing. Maybe they just need to hide the formulas like the IRC rule, and keep it a black box rule.