I found this interesting and applied it to my selected races yesterday.

BR2 Fav under 2 no bet
BR6 fav under 2 no bet
BR7 14 runners no bet (winner was equal 5th rated 1.3x14.91)
*PR3 4.6 out 0 in
PR5 15 runners no bet (winner was equal 5th rated 1.3 x 12.45)
PR6 16 runners no bet (winner 5th rated 1 x 10.00)
*PR7 4.9 out 32.51 in 4th rated overs
SR6 16 runners no bet

So 2 races to bet on for an after coms return of 21.33

I made note of the other races.