On the Cheltenham Festival, I looked at win and place records for the top 10 NH sires (from a googled list produced by Thoroughbred Owner Breeder & Pacemaker). I am assuming the list is up to date. The site I use for stats research, the superb Horseracebase.com, has data going back to 1997.
List is top sire downward. First figure after sire name is win %, second is place %. Where the sire has had fewer than 100 runners at the Cheltenham Festival, I’ve put the total number of runners in brackets:
KING’S THEATRE 9.55/22.29
KAYF TARA 6.31/17.12
MILAN 7.25/28.99 (69)
WESTERNER 9.09/15.91 (44)
MIDNIGHT LEGEND 5.45/25.45 (55)
ROBIN DES CHAMPS 30.23/34.88 (43)
Robin Des Champs looks far and away the best, but his 13 wins were achieved by just 4 horses:
Sir Des Champs (2)
Un Temps Pour Tout (2)
If nothing else, this is a good example of the wisdom of digging into headline stats and not just rushing off to back what seems the obvious.