ok Steve
3lbs = 2 lengths at 1.5 miles
so looking at the Arcs since Lammtarra [not counting that now as Barry says only 1lb that year] shows that a 3yo would have still won in the following years when looking to within 2 lengths for the nearest older horse
1996 Helissio
1997 Peintre Celebre
1998 Sagamix
2000 Sinndar
2004 Bago
2005 Hurricane Run [Dead Heat]
2008 Zarkava [Dead Heat]
2009 Sea The Stars [Dead Heat]
2011 Danedream
the race has been run 90 times and 3yo have won 57 times =
63%
in the last 16 years without the 3lb extra wfa 3yo would have won the Arc 9 times..thats
56%
in the last 17 years 3yo's have won
82% as you say
is it significant statistically though?
this has happened before
between 1959 - 1972 when 3yo won
86%
and
1920-31 =
75% 3yo winners
in those days the race had better older horses as the race was a main target for older horses as the international scene was not in place then..so how on earth did all those 3yo's win?
so even in those days then 3yo's had periods where they dominated..nowadays with other target races appealing more for the older horses its not really that surprising that 3yo's are mopping up
but the period you quote isn't a large sample neither are those that were taking place 50 and 90 years ago.
how would you have explained those other golden 3yo periods?...can you answer this question and not gloss over it?
they are just blips Steve
and also you are assuming that 3lbs will affect all horses down by the same margin..to some horses it won't slow em down by a length probably