No, I haven't kept records of that. I did notice that it worked today though and I wouldn't be surprised if it was successful. (there have been some big trifectas and first 4s won by boxing up the 6 horses above the line)

However, today might have been a bit of a one off because it was a pretty open sort of day. If you had the first 2 favs running the quinella a lot, I don't think you'd be able to make a profit.

I will eventually get around to doing a full review of the ratings (I'm currently working on a review of the Greyhound ratings), so if you're patient, I'll get back to you on this idea.