Hi Dr Ron,

OK Found it.

These figures aren't actual bets but returns by my ratings system over past years. They are percentage returns betting my best rated horse to win with various field sizes on races since 1994. Strike rate is about 29% if it is of any use to you.

Runners   <=7     8     9    10    11     12    13    14     15     16    <=17

WA        96.2  108.3  92.7 104.6 104.2 105.0  91.0  104.0  116.3   94.9    -

NSW      101.8  100.3  99.7 101.1 106.8 105.1 105.6  107.1   97.7   100.3   65.3

QLD       97.1   98.0  98.4 105.0 110.8  98.4  90.6   97.5  113.2   98.0   114.3

This includes about 8000 races overall for WA and 32000 for NSW so it's quite a significant sample. I can't see any great correllation between field size and success rate but I have to say I didn't expect to. I would expect less wins but at a correspondingly higher price in larger fields.

KV