I just don't get this line breeding theory and here is why. 4 stallions and maybe 50 ...70 mares close to 300 years ago, and bang, the book was slammed shut . So every thoroughbred has 999.999% identical genes without question.. 9 out of 10 foals are quite hopeless , 9 out of 10 well bred million dollar babies are quite hopeless too. It is a game of chance. I acknowledge the potency of proven stallions to change the odds a little (but they are getting winning mares to act upon) but there will still be a truck load of useless Frankel's at 220 live foals a year (anyone figures out there?)