i personally found ybs on dark are great as ybs scatty as yearlings (ie in the clock one week behind next few) 2yo + come good if they were good as ybs have had 1 cock won 2 as yb, rubbish as a yearling went on to win 3 as a 2 year old, 1 as a 3 yeqar old and 2 as a 4 year old, this is not a one of with darkness birds for us, seems to be a reccurance,